All tools

Calculate A/B test statistical significance. Enter control and variant visitors and conversions to see p-value, lift, and significance.

ABCD2 score for stroke risk after transient ischemic attack.

Convert m/s² to g-force, ft/s², Gal, and km/h per second instantly with exact NIST factors. Free acceleration unit converter in your browser.

Drop in a silent clip and an audio track, set the volume, trim where the sound starts, and export an MP4 that plays with music.

Hold one frame in the middle of a clip. Pick the timestamp and how many seconds it pauses, then export the video with the freeze baked in.

Burn an SRT or VTT file permanently into the picture so the captions survive re-uploads to platforms that quietly strip subtitle tracks.

Add text overlays and captions to animated GIFs in your browser. Pick fonts, colors, position, and download — no upload, no watermark.

Lay a caption bar across the bottom of every frame of a GIF. Type the line, pick the font size, and export the meme in one pass.

Add text or image watermarks to photos in your browser. Adjust opacity, position, size, and rotation. No upload to servers.

Put the classic white caption bar above a GIF instead of over it, so the text stays readable and the frame stays uncovered.

Calculate exact age in years, months, and days from a birth date. Updates to today or any target date.

See how much of a model context window your text uses. Compare GPT-4o, Claude, and Gemini token limits.

Estimate embedding API costs for OpenAI, Cohere, and Voyage. Enter token count and see per-request pricing.

Compare LLM API costs across OpenAI, Claude, and Gemini for the same token counts. Free browser calculator.

Albumin, INR, mental status, systolic pressure and age combine into a 0 to 5 estimate of in-hospital death after an upper GI bleed.

Aldrete and Kroulik post-anesthesia recovery score.

Simplify expressions, factor polynomials, solve equations, and compute derivatives. Renders math with LaTeX.

Add up the eight MANTRELS findings to gauge how likely acute appendicitis is, and whether to observe, image, or call surgery.

Estimate Amazon referral fees, FBA fees, and net profit per sale. Enter price, category, and fulfillment method.

Convert moles to millimoles, micromoles, kilomoles, and pound-moles instantly. Free amount-of-substance converter that runs in your browser.

Convert degrees to radians, gradians, arcminutes, arcseconds, and turns instantly. Free angle unit converter that runs entirely in your browser.

Turn a still image into an animated GIF with zoom, pan, bounce, rotate, or fade effects. Set duration and FPS, then download.

Give a single photo a zoom, pan, or pulse move and export it as a looping GIF. Frame count and delay control how slow the motion reads.

Assemble a set of images into an animated JPEG XL, or animate one photo with zoom and pan motion. Set the frame delay, then download the file.

APA to MLA Citation Converter. Free, instant, runs in your browser.

Twelve physiologic variables plus age and chronic health status, scored 0 to 71, with the predicted ICU mortality attached to each band.

Calculate the APGAR score at 1 and 5 minutes for newborn assessment.

Generate cryptographically secure API keys in hex, base64, or alphanumeric formats. Runs offline in your browser.

API Mock JSON Response Generator. Free, instant, runs in your browser.

Stack a set of images into an animated PNG, or hand it a single photo and let a zoom, pan, or pulse motion generate the frames for you.

Push a clip through one of three looks: vivid color, flat grayscale, or full negative. The graded video is re-encoded to MP4 on your own machine.

Convert square feet to square meters, acres to hectares, and every common area unit instantly. Free area converter that runs in your browser.

10-year heart attack and stroke risk by the ACC/AHA Pooled Cohort Equations.

Alberta Stroke Program Early CT Score (ASPECTS) for early ischemic changes in stroke.

Set fade in and fade out lengths in seconds so a track eases in and ends without a hard cut. Total duration tells it where the tail sits.

Convert audio to text online for free. Transcribe MP3, WAV, M4A, and more to text, SRT, or VTT in your browser — no upload, no signup.

Render any audio track as a 1200 by 200 pixel waveform PNG, the kind of image podcast pages, audiograms, and release posts run above the player.

Build a looping animated AVIF from a batch of images. Same motion as a GIF at a fraction of the byte count, with full color instead of 256.

Remove image backgrounds instantly in your browser using AI. No upload, no sign-up — powered by a local ML model.

Convert Mbps to MB/s, Gbps to Mbps, and MiB/s instantly — decimal and binary prefixes handled correctly. Free bandwidth converter in your browser.

Generate barcodes in Code 128, EAN-13, UPC-A, QR, Data Matrix, and more. Download as PNG or SVG.

Encode text to Base64 or decode Base64 back to text. Also supports image to Base64.

Paste a Base64 string or data URL and instantly preview the image with format, dimensions, and size.

Hash passwords with bcrypt in your browser. Choose cost factor, generate secure hashes, and verify passwords. No upload — runs locally.

Convert radioactivity between becquerels, megabecquerels, curies, and millicuries instantly — 1 Ci = 3.7×10¹⁰ Bq. Free converter in your browser.

Convert between benzodiazepine doses (diazepam, lorazepam, alprazolam, clonazepam, etc.).

Calculate bicarbonate replacement dose for severe metabolic acidosis.

Five findings available within the first 24 hours flag which acute pancreatitis admissions carry the higher mortality, well before a CT severity index is usable.

Bishop score for predicting successful labor induction.

Calculate Body Mass Index (BMI) and body surface area from weight and height. Includes BMI classification.

Estimate basal metabolic rate from sex, age, height and weight, with Mifflin-St Jeor, Harris-Benedict and Katch-McArdle side by side.

Amplify a quiet recording by a set number of decibels and download the louder file, so an interview taken at arms length becomes audible.

Find your break-even point in units and revenue. Enter fixed costs, price per unit, and variable cost per unit.

Browse a curated collection of beautiful color palettes. Filter by mood, search by color, and copy hex values instantly.

Convert a folder of AVIF photos to JPG at the quality you choose, for uploaders and marketplaces that reject the newer format.

AVIF keeps files small but half the editors out there cannot open one. Convert a batch to PNG and get images that paste anywhere.

Convert JPG photos to PNG in one pass, so every later edit and re-save avoids stacking another round of lossy compression.

Flatten a batch of PNGs to JPG and set the compression level, for when screenshots and exports keep hitting an upload limit.

Turn a stack of WebP files into PNGs with transparency intact, for the apps and CMSes that still refuse to read WebP.

Business Days Calculator. Free, instant, runs in your browser.

CAGE questionnaire for alcohol use disorder screening (4 questions).

Calculate compound annual growth rate between two values over any time period. Instant CAGR percentage.

Correct total serum calcium for hypoalbuminemia.

Estimate per-request cost for GPT-4o, Claude, Gemini, and more. Enter token counts and see input, output, and total pricing.

Calculate customer acquisition cost, lifetime value, LTV:CAC ratio, and payback period for your marketing funnel.

Calculate marketing campaign ROI, ROAS, and profit. Enter revenue and ad spend for instant results.

Confusion Assessment Method for the ICU (CAM-ICU) for delirium screening in critically ill patients.

Add up four ICU risk factors: a total of 3 or more flags invasive candidiasis in non-neutropenic patients and justifies an antifungal work-up.

Convert capacitance between farads, microfarads, nanofarads, and picofarads instantly. Free capacitance unit converter that runs in your browser.

Caprini Risk Assessment for venous thromboembolism in surgical patients.

Combines physical signs with neurological responses to date a newborn, the Capurro variant to reach for after the first 24 hours of life.

Estimate gestational age from five physical findings in the first day of life, for when ultrasound dating or a last menstrual period is missing.

Convert text to uppercase, lowercase, title case, sentence case, camelCase, snake_case, kebab-case, and CONSTANT_CASE as you type.

Canadian Cardiovascular Society (CCS) functional classification of angina pectoris.

Crohn's Disease Activity Index (CDAI) for assessing Crohn's disease activity.

Pixelate or blur specific areas of images and GIFs. Draw rectangles over faces or sensitive content, then download.

Certificate Expiration Checker. Free, instant, runs in your browser.

Seven risk factors give a 0 to 9 stroke risk score for non-valvular atrial fibrillation, with the annual risk and the anticoagulation threshold for each sex.

Estimate the yearly stroke risk of non-valvular atrial fibrillation, running from roughly 1.9 percent at zero points to 18 percent at six.

Speed a track up or slow it down, then download the retimed file. Built for lecture recordings, practice loops, and audiobook pacing.

Set how many times an animated GIF repeats before it stops. Enter 0 to loop forever, 1 to play once and freeze, or any count in between.

Set a speed percentage and the frame delays get rewritten, so the animation runs faster or slower without re-encoding a single pixel.

Reshape a photo to 16:9, 1:1, or any ratio you type in. Letterbox mode pads the gaps with white, crop mode trims whatever hangs over the edge.

Retime a clip anywhere from 0.25x to 4x and export the result, whether you want a timelapse or slow motion out of a phone recording.

Create realistic ChatGPT conversation screenshots. User prompts and AI responses with the official ChatGPT UI.

Paste page HTML to audit title, description, canonical, Open Graph, and Twitter tags. Paste-only — cannot fetch live URLs.

Checksum Calculator — SHA-256 & More. Free, instant, runs in your browser.

Child-Pugh score for prognosis of chronic liver disease and cirrhosis.

Citation Generator — APA & MLA. Free, instant, runs in your browser.

Estimate glomerular filtration rate (eGFR) using the 2021 CKD-EPI creatinine equation.

Clean Up Markdown Text Online. Free, instant, runs in your browser.

Weigh temperature, white count, secretions, oxygenation, chest film and cultures into a 0 to 12 score; anything above 6 argues for treating ventilator-associated pneumonia.

Convert clothing sizes between US, UK, EU, Italian, and Japanese charts for women’s dresses, men’s suits, and shirts. Free, in your browser.

Estimate creatinine clearance using the Cockcroft-Gault formula.

Preview how colors and images appear to people with color blindness — protanopia, deuteranopia, tritanopia, and more.

Check color contrast ratios for WCAG AA and AAA compliance. Test foreground and background colors for accessibility.

Generate complementary, triadic, analogous, split-complementary, and more color harmonies from any base color.

Generate color shades and Tailwind CSS palettes from a single hex color. Export as CSS variables, Tailwind config, or design tokens.

Merge two or more GIFs into one animation — side by side or stacked. Align timing and download the combined GIF.

Merge two animated GIFs into one, side by side or stacked. The shorter clip loops so both keep playing until the longer one finishes.

Calculate sales commission from deal value and commission rate. Supports flat rate and tiered percentages.

Compare Prompt Versions. Free, instant, runs in your browser.

Compare Two Hashes Online. Free, instant, runs in your browser.

Drop two images and get them laid out side by side at full resolution on one canvas, which makes before and after differences easy to spot.

Compare Two Prompts — Prompt Diff. Free, instant, runs in your browser.

Compare two blocks of text and highlight added, removed, and unchanged lines.

Calculate compound interest with monthly contributions. See balance growth over time with a year-by-year breakdown.

Pick a target bitrate and re-encode down to it. Taking a spoken-word track from 320 to 96 kbps cuts the file by roughly two thirds.

Compress JPG, PNG, and WebP images in your browser. Side-by-side preview, savings %, EXIF strip — no upload, no watermark.

Shrink a PDF until it clears an email or upload cap. The document is rebuilt with compact object streams, and it never leaves your machine.

Compress MP4, WebM, and MOV videos to a smaller file size. Choose a quality preset, runs entirely in your browser.

Convert desired annual salary to an hourly contractor rate. Factor in billable hours, expenses, and tax buffer.

Convert animated WebP images to MP4 video in your browser. Adjust quality and resolution, batch convert, then download.

APNG keeps full color and alpha, but plenty of apps only read GIF. Decode the animated PNG and download a 480 pixel wide GIF at 10 fps.

AVIF animations compress beautifully and play almost nowhere. Decode one here and get a GIF back at 480 pixels wide and 10 frames per second.

Convert colors between HEX, RGB, HSL, OKLCH, and LAB formats instantly. Includes a live color picker preview.

Convert CSV to JSON or JSON to CSV instantly. Auto-detects delimiters — supports comma, semicolon, and tab.

Convert CSV to SQL INSERT Statements. Free, instant, runs in your browser.

Convert cURL commands to JavaScript fetch() code. Paste curl and get copy-ready fetch syntax.

Convert cURL commands to Python requests code. Paste curl and get copy-ready Python.

Convert EPUB e-books to PDF, HTML, or plain text. Preview chapters and download — runs in your browser, no upload.

Move an animation to APNG when 256 colors and hard-edged transparency are not enough. APNG carries full alpha and 24-bit color per frame.

Swap an animated GIF for a JPEG XL that carries the same picture in far fewer bytes. Drop the file in, wait for the encode, take the result.

Turn an animated GIF into an MP4 a fraction of the size, which is the format Twitter, Discord, and most CMS uploads actually prefer.

Re-encode an animated GIF as animated WebP, which usually lands under half the file size while keeping the same frames and timing.

Paste HTML and get clean Markdown instantly. Handles headings, lists, links, images, tables, and code blocks.

Paste a JSON array and instantly get a formatted Markdown table. Perfect for READMEs and documentation.

Bidirectional Markdown ↔ HTML converter. Paste content and get instant output — headings, lists, links, code blocks, and more.

Convert MNG (Multiple-image Network Graphics) to APNG in your browser. Preserves frames and timing — no upload, no watermark.

MNG is a dead animation format that almost no viewer opens today. Drop the old file in and get a standard GIF, 480 pixels wide at 10 fps.

Convert MongoDB JSON to SQL. Free, instant, runs in your browser.

Convert MOV (QuickTime) files to MP4 directly in your browser. Lossless when possible — no upload, no watermark, no signup.

Extract audio from MP4, WebM, or MOV videos and download as MP3. Runs in your browser — no upload, no signup, no watermark.

Convert MP4 video files to WebM in your browser. No upload, no watermark, no signup — runs entirely on your device.

Convert OGG (Vorbis or Opus) files to MP3 in your browser. No upload, no signup — files never leave your device.

Convert Opus files to MP3 in your browser — including WhatsApp voice messages. No upload, no signup, files never leave your device.

Convert PDF files to clean Markdown with heading detection. Ideal for LLM context and documentation.

Convert PDF to editable PowerPoint slides — text, images and shapes, not screenshots. Runs 100% in your browser.

Convert SQL INSERT to CSV. Free, instant, runs in your browser.

Animated WebP still breaks on older forums and chat clients. Feed one in and take away a plain GIF, 480 pixels wide at 10 frames per second.

Calculate corrected QT (QTc) using Bazett, Fridericia, Framingham, and Hodges formulas.

Convert between corticosteroid doses (prednisone, dexamethasone, hydrocortisone, etc.).

Count AI tokens for GPT-4o, Claude, Gemini, and more. Paste text and see estimated token, word, and character counts instantly.

Countdown to Date Calculator. Free, instant, runs in your browser.

Stratify Covid-19 severity by clinical and laboratory criteria.

See how long paying off a credit card takes and what it costs. Compare your monthly payment against minimum payments at your APR.

Build and decode cron expressions with a visual editor.

Set an X, Y, width, and height crop box and every frame gets cut to it. Handy for chopping black bars or a corner watermark off a loop.

Crop a photo with a draggable selection box, exact X, Y, width and height fields, and an optional 1:1, 4:3, 16:9, or 3:2 ratio lock.

Trim the dead margins off scanned pages so the text fills a tablet or e-reader screen. Pick the area to keep once, apply it to every page.

Crop MP4, WebM, and MOV videos in your browser. Drag a crop box, pick an aspect ratio — no upload, no watermark, no signup.

Estimate in-hospital major bleeding risk in NSTE-ACS from eight variables, then weigh it against ischemic risk before choosing antithrombotics.

Crypto Profit Calculator. Free, instant, runs in your browser.

CSR Generator — RSA Key Pair. Free, instant, runs in your browser.

CSS Beautifier Online. Free, instant, runs in your browser.

Generate CSS gradients visually with live preview.

CSS Grid Generator. Free, instant, runs in your browser.

Minify CSS stylesheets online. Remove comments and whitespace from pasted CSS. Free browser minifier.

Clean CSV files online. Trim whitespace, remove empty rows, and fix line endings. Runs in your browser.

CSV Column Mapper & Renamer. Free, instant, runs in your browser.

CSV Delimiter Converter. Free, instant, runs in your browser.

CSV Diff — Compare Two CSV Files. Free, instant, runs in your browser.

CSV to Excel Converter Online. Free, instant, runs in your browser.

CURB-65 score for community-acquired pneumonia severity and mortality risk.

Build cURL commands from URL, method, headers, and body. Copy-ready curl for any HTTP request.

Currency Margin Calculator. Free, instant, runs in your browser.

Give a start and end time to keep one section of an MP3, WAV, or FLAC file, then download just that piece as a new track.

Type a start and end time in seconds and keep only the frames in between, trimming a long animation down to the part that matters.

Disease Activity Score (28 joints) with CRP for rheumatoid arthritis activity.

Disease Activity Score (28 joints) with ESR for rheumatoid arthritis activity.

Count the days between two dates, with a years-months-days breakdown, weeks, hours, and business days that skip weekends.

DCF Calculator — Discounted Cash Flow NPV. Free, instant, runs in your browser.

Plan your debt-free date. List balances, APRs, and minimums, add an extra budget, and compare snowball vs avalanche strategies.

Decode and inspect JWT tokens instantly — view header, payload, and signature.

Convert kg/m³ to g/cm³, lb/ft³, lb/in³, and kg/L instantly with exact NIST-derived factors. Free density unit converter in your browser.

Get a text description of every second of your video — an AI model describes each frame locally in your browser. No upload, no signup.

Weight MI timing, angina class, pulmonary edema and seven more factors into a Detsky class I to III for cardiac risk before non-cardiac surgery.

Generate Dilmes Ipsum placeholder text using real quotes from former Brazilian president Dilma Rousseff.

Create realistic Discord chat screenshots. Server-style messages with avatars, timestamps, and reactions.

Arterial pH, bicarbonate and mental status grade a diabetic ketoacidosis episode mild, moderate or severe by whichever parameter is worst.

Convert DOCX, EPUB, ODT, HTML, Markdown, RTF, CSV, and JSON with Pandoc WASM in your browser. Upload, pick a format, preview, and download.

Model dollar-cost averaging with recurring investments. See average cost per share and total invested.

Convert IV drip rate from drops per minute (gtt/min) to mL/hour and vice versa.

Convert dynamic viscosity between Pa·s, poise, centipoise, and lbf·s/ft² instantly with NIST factors. Free viscosity converter in your browser.

Eastern Cooperative Oncology Group performance status scale (0–5).

Convert electric charge between coulombs, ampere-hours, and milliamp-hours instantly. Free charge unit converter for battery and electronics work.

Convert electric current between amps, milliamps, microamps, and kiloamps instantly. Free current unit converter that runs in your browser.

Convert electric potential between volts, millivolts, microvolts, kilovolts, and megavolts instantly. Free voltage unit converter in your browser.

Convert electrical conductance between siemens, millisiemens, microsiemens, and mho instantly. Free conductance unit converter in your browser.

Convert electrical resistance between ohms, kiloohms, megaohms, and gigaohms instantly. Free resistance unit converter that runs in your browser.

Click any emoji to instantly copy it to your clipboard. Search and browse 2,300+ Unicode emojis by category.

Convert joules to calories, kWh to BTU, electronvolts, and foot-pounds instantly with NIST factors. Free energy converter, runs in your browser.

Scale a photo up to four times its original size with high quality resampling. Set the percentage, check the preview, and save the bigger file.

ER Diagram Generator from Schema. Free, instant, runs in your browser.

Convert HbA1c percentage to estimated average glucose (eAG) in mg/dL and mmol/L.

Estimate total blood volume by weight, height, and sex (Nadler formula).

Calculate Etsy listing, transaction, payment processing, and shipping fees. See net profit per sale instantly.

Translate Excel function names between English, Portuguese, and Spanish. Search 375 functions — VLOOKUP is PROCV in pt-BR, BUSCARV in Spanish.

Excel to CSV Converter Online. Free, instant, runs in your browser.

Browse 1,035 exercises by muscle, equipment, and difficulty. Step-by-step instructions and a muscle map for every exercise — free, no sign-up.

Give a target length in seconds and the loop repeats until it gets there, for when a two-second clip has to fill a fixed slot.

Extract JSON from LLM responses. Parse fenced code blocks and inline objects from pasted model output.

Extract text from any PDF file instantly in your browser. No upload to servers — runs 100% locally.

Assess nicotine dependence severity with the Fagerström Test (6 questions).

Create realistic Instagram DM screenshots. Purple gradient header, heart reactions, disappearing messages.

Create realistic iMessage chat screenshots. Blue and gray bubbles, delivered/read receipts, download as PNG.

Create realistic X/Twitter post screenshots. Profile, tweet text, likes, retweets, and reply counts.

Create realistic WhatsApp chat screenshots. Edit messages inline, toggle dark mode, download as PNG.

Generate favicons in all sizes from a single image. Download as ICO, PNG, or a complete ZIP with all sizes.

FIB-4 index for non-invasive liver fibrosis assessment.

Convert 180+ image formats, audio, video, and documents in your browser. ImageMagick, FFmpeg, and Pandoc WASM — all processing runs locally.

Calculate the final exam score you need to reach your target course grade. Enter current grade and final weight.

Score severity of neonatal abstinence syndrome using the Finnegan scale.

Calculate years to financial independence using the 4% rule. Enter savings, expenses, income, and savings rate.

Grade subarachnoid hemorrhage by CT scan appearance using the Fisher scale.

Flashcard Formatter — Q&A to Markdown. Free, instant, runs in your browser.

Flexbox CSS Generator. Free, instant, runs in your browser.

Convert volumetric flow between L/min, GPM, CFM, m³/h, and L/s instantly with exact NIST factors. Free flow rate converter in your browser.

Upload any OTF or TTF font file and inspect its metadata, character set, OpenType features, and glyph table.

Convert newtons to pounds-force, kilograms-force, dynes, and poundals instantly with exact NIST factors. Free force converter in your browser.

Format AI Output — JSON & Markdown. Free, instant, runs in your browser.

Format, minify and validate JSON instantly.

Full Outline of UnResponsiveness (FOUR) score for coma assessment.

Change video frame rate (FPS) online — convert between 24, 30, 60 fps and more. Runs entirely in your browser.

Differentiate prerenal from intrinsic acute kidney injury using FENa.

FEUrea for AKI workup in patients on diuretics where FENa is unreliable.

10-year cardiovascular disease risk by Framingham equations.

Convert hertz to kilohertz, megahertz, RPM, and radians per second instantly. Free frequency unit converter that runs entirely in your browser.

Calculate LDL cholesterol using the Friedewald formula from total cholesterol, HDL, and triglycerides.

Check the GELF markers of high tumor burden to settle whether follicular lymphoma calls for treatment now or watchful waiting.

Generate Business Name Ideas. Free, instant, runs in your browser.

Generate Invoice Numbers Online. Free, instant, runs in your browser.

Generate lorem ipsum placeholder text instantly.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input instantly.

Generate Purchase Order Online. Free, instant, runs in your browser.

Generate one or many UUIDs instantly — supports v1, v4, and v5.

Calculate gestational age and estimated due date from last menstrual period (Naegele rule).

Calculate gestational age and due date from ultrasound biometry.

Inspect animated GIF internals: dimensions, frame count, delays, palettes, and disposal methods. Export metadata as JSON.

Remove the background from any GIF and make it transparent. Pick a color, adjust tolerance, download — 100% in your browser.

Compress GIF files and reduce their size in your browser. Cut colors, resize, drop frames — no upload, no watermark, no signup.

Recolor every frame of a GIF at once with grayscale, sepia, invert, or blur, then re-encode the animation with the new look baked in.

Lift choppy footage to 30, 48, or 60 fps by generating the missing in-between frames with motion interpolation. Takes MP4, WebM, and MOV.

Upload images and create animated GIFs instantly in your browser. Drag to reorder frames, set speed, and download — no upload to servers.

Overlay a static image or another GIF on top of an animated GIF. Drag to position, resize, set opacity, and download.

Break an animated GIF back into its individual frames, review every one as a thumbnail, and save them all as numbered PNG files in one click.

Turn an animated GIF into a MOV clip the iPhone Photos app accepts as a Live Photo, wallpaper and lock screen included.

Lay every frame of an animated GIF out in a single grid image, ready for a CSS sprite animation or a game engine atlas.

Classify asthma control using the GINA 2025 criteria (well-controlled, partly controlled, uncontrolled).

Glasgow Coma Scale with pupil reactivity score (GCS-P).

Create realistic Gmail email screenshots. From, to, subject, body with the official Gmail UI.

The original 1977 nine-factor index, scoring perioperative cardiac complication risk from S3 gallop, recent MI, arrhythmia and surgery type into classes I to IV.

Calculate GPA from letter grades and credit hours on a 4.0 scale. Add courses and see weighted GPA instantly.

GRACE score for in-hospital and 6-month mortality in acute coronary syndrome.

Calculate weighted course grade from assignment scores and weights. See your overall percentage instantly.

Plot mathematical functions on an interactive graph. Supports multiple equations, zoom, pan, and real-time updates.

Convert absorbed radiation dose between grays, milligrays, and rads instantly — 1 Gy = 100 rad exactly. Free dose unit converter in your browser.

Validate GTIN, EAN-13, and UPC barcodes. Verify check digits and format. Free, runs in your browser.

Seven admission variables (BP, BUN, sodium, age, heart rate, race, COPD) map to in-hospital mortality in acute heart failure, from under 1 percent to over 50.

Apply halftone dot, line, or diamond patterns to images and GIFs. Black & white or colored halftone — preview and download.

Redraw a photo as black dots on white, the way newspapers used to print pictures. Dial the dot density from coarse and punchy to fine and subtle.

Harvey-Bradshaw Index for Crohn's disease activity (simplified CDAI).

Nine factors give the one-year major bleeding risk on anticoagulation for AF, and flag which of them (BP, alcohol, NSAIDs, labile INR) you can actually fix.

Identify hash types from pasted digests. Detect MD5, SHA-256, bcrypt, and more. Paste only, runs in browser.

Convert hat sizes between head circumference in cm or inches, US and UK numeric sizes, and S/M/L letters. Free hat size converter in your browser.

HEART Score for major adverse cardiac events in chest pain patients.

Convert iPhone HEIC and HEIF photos to JPG in batches, with a quality slider and the size saved on every file.

Generate HMAC signatures with SHA-256, SHA-384, or SHA-512. Enter message and secret key — runs in your browser.

Beautify and indent pasted HTML for readability. Format messy markup instantly. Free, runs in your browser.

Escape HTML special characters to entities or decode them back, covering named, decimal, and hexadecimal references without touching innerHTML.

Minify HTML by removing comments and extra whitespace. Paste HTML and copy compressed output. Runs in browser.

HTML Preview Online. Free, instant, runs in your browser.

HTML Structure Validator. Free, instant, runs in your browser.

HTTP Request Builder — Raw & cURL. Free, instant, runs in your browser.

Validate IBAN numbers with mod-97 check digits. Paste an IBAN to verify format and checksum. Free browser tool.

Calculate ideal body weight by height using the Devine, Robinson, Miller, and Hamwi formulas.

Estimate the expected normal PaO2 based on patient age.

Generate alt text for images using AI — runs locally in your browser. No upload, no sign-up required.

Convert HEIC to PNG, JPEG, or WebP — plus PNG, JPEG, WebP, and AVIF. Resize, adjust quality, and download — all in your browser.

Encode a PNG, JPG, SVG, or WebP as a base64 data URI you can paste straight into a CSS background or an img src. One less HTTP request.

Convert raster images (PNG, JPEG) to SVG vector graphics. Adjust detail, colors, and smoothing. Runs in your browser.

Order a stack of photos, set the frame rate, and render them into an MP4 slideshow you can post anywhere a video file is accepted.

Convert inductance between henries, millihenries, microhenries, and nanohenries instantly. Free inductance unit converter that runs in your browser.

See how inflation erodes purchasing power. Enter an amount and year range using historical US CPI data.

Grade the six body regions on the AIS scale; the three worst get squared and summed into the 0 to 75 trauma score where anything above 15 counts as major trauma.

Split a wide or tall image into seamless carousel slides for Instagram. Download all slides as a ZIP.

Crop and resize an animated GIF to the 1:1 square Instagram expects, then download it sized and ready to post.

Create realistic Instagram post screenshots. Profile, caption, likes, comments, and image placeholders.

Download Instagram Reels and videos in MP4 format. Paste the link, click download — free, no login, no watermark.

Invert or negate colors in images and animated GIFs. Full inversion or per-channel control. Preview and download instantly.

Calculate invoice due dates from issue date and payment terms. Net 30, Net 60, or custom days.

Parse and format ISO 8601 dates. Convert between ISO strings, local datetime, and Unix timestamps.

Find the ISO week number for any date. See week start, week end, and year-week label.

JavaScript Minifier Online. Free, instant, runs in your browser.

Drop JPG, PNG, or WebP files, set the page order, then export one PDF with a page per image. Choose A4, Letter, or fit-to-image, plus margins.

Compare two JSON documents and highlight added, removed, and changed keys. Formatted side-by-side diff.

JSON Flatten — Nested to Dot Notation. Free, instant, runs in your browser.

JSON Path Tester Online. Free, instant, runs in your browser.

JSON Schema Generator from JSON. Free, instant, runs in your browser.

Validate JSON data against a JSON Schema. Paste instance and schema to see errors instantly.

Audit pasted JWT tokens for security issues. Flag alg none, expiry, and missing claims. Runs in your browser.

Karnofsky Performance Status scale (0–100) for assessing oncology patient function.

Predict chemotherapy-associated clot risk in ambulatory cancer patients from cancer site, blood counts and BMI, plus the threshold where prophylaxis is worth considering.

Convert kinematic viscosity between m²/s, stokes, centistokes, and ft²/s instantly with exact NIST factors. Free viscosity converter in your browser.

Lawton Instrumental Activities of Daily Living scale for functional assessment in elderly.

Lee RCRI for preoperative cardiac risk in non-cardiac surgery.

Predict 6-month mortality in alcoholic hepatitis patients on steroid therapy using the Lille model.

Calculate the optimal CSS line-height for any font size. Live preview and copy-ready CSS values.

Pull the MOV half out of an iPhone Live Photo and hand back a GIF that posts anywhere. Output runs 480 pixels wide at 10 frames per second.

Calculate monthly loan payments and total interest for personal, auto, or business loans. See full amortization schedule.

Find your loan payoff date and what extra monthly payments save — months cut and interest saved, side by side with your current plan.

Validate numbers with the Luhn algorithm. Check credit card and identifier check digits. Paste only, in browser.

Convert luminance between cd/m² (nits), foot-lamberts, stilbs, and lamberts instantly with exact NIST factors. Free converter in your browser.

Convert luminous energy between lumen-seconds, talbots, lumen-minutes, and lumen-hours instantly. Free photometry unit converter in your browser.

Convert luminous flux between lumens, kilolumens, millilumens, and candela-steradians instantly. Free photometry unit converter in your browser.

Convert luminous intensity between candela, millicandela, and candlepower instantly — LED mcd ratings included. Free converter in your browser.

Convert illuminance between lux, foot-candles, and phots instantly — 1 fc = 10.764 lx exactly. Free lighting unit converter in your browser.

Enter prothrombin time, the lab control PT and bilirubin to get the discriminant function and see whether alcohol-associated hepatitis crosses the DF 32 steroid threshold.

Convert magnetic field strength H between amperes per meter and oersteds instantly — 1 Oe = 1000/4π A/m. Free converter in your browser.

Convert magnetic flux between webers, milliwebers, and maxwells instantly — 1 Wb = 10⁸ Mx exactly. Free flux unit converter in your browser.

Convert magnetomotive force between ampere-turns and gilberts instantly — 1 Gb = 10/4π At exactly. Free MMF unit converter in your browser.

Pick the highest indicator in each clinical process and the Larach scale ranks how likely an intraoperative event really was malignant hyperthermia, rank 1 to 6.

Write markdown and preview the output in real time.

Build Markdown tables visually with a grid editor. Set alignment, add rows and columns, copy the output.

Total seven items to a maximum of 26; a score of 21 or more marks febrile neutropenia as low risk and opens the door to oral outpatient antibiotics.

Convert mass flow between kg/s, kg/h, tonnes per hour, lb/s, and lb/h instantly with exact NIST factors. Free flow rate converter in your browser.

Combine stool frequency, rectal bleeding, endoscopy and physician assessment into a 0 to 12 activity score, or drop the endoscopy item for the partial Mayo.

Convert a vasoactive order written in mcg/kg/min into the pump rate in mL/hour, from patient weight and bag concentration.

Estimate glomerular filtration rate using the 4-variable MDRD equation.

Calculate mean arterial pressure (MAP) from systolic and diastolic blood pressure.

Model for End-Stage Liver Disease (MELD) and MELD-Na scores for cirrhosis prognosis.

Merge multiple PDF files or extract specific pages into a new PDF. Runs entirely in your browser.

Line up MP3, WAV, or OGG tracks in whatever order you want and stitch them into a single file with no silence dropped in between.

Merge multiple CSV files into one. Combines headers automatically. Paste or type CSV content.

Queue MP4, WebM, or MOV clips, arrange the order, and join them end to end into one continuous file you can download in a single click.

Generate HTML meta tags for SEO and social sharing. Covers title, description, canonical, Open Graph, and Twitter Card tags.

Score cognitive function with the 30-point Mini-Mental State Examination.

Modified Centor score for streptococcal pharyngitis probability.

Convert molar mass between g/mol, kg/mol, kg/kmol, daltons, and lb/lb-mol instantly. Free molar mass unit converter that runs in your browser.

Calculate monthly mortgage payments, total interest, and full amortization schedule. Enter loan amount, rate, and term.

Should you refinance? Compare current vs new rate and term: monthly savings, break-even point on closing costs, and lifetime savings.

Android phones hide a short video clip inside MVIMG motion photos. Extract it and export the movement as a plain GIF anyone can view.

Convert fuel economy between US MPG, UK MPG, L/100km, and km/L instantly. Free fuel consumption converter that runs entirely in your browser.

Generate Mussum Ipsum placeholder text — a Brazilian lorem ipsum full of invented words and humor.

Remove audio from MP4, WebM, and MOV videos. Lossless — keeps video quality intact, runs in your browser.

Age, BMI, glucose status, AST/ALT, platelets and albumin give a non-invasive read on advanced fibrosis in fatty liver, with both NFS cutoffs applied.

National Early Warning Score 2 (NEWS 2) for clinical deterioration detection.

National Institutes of Health Stroke Scale (NIHSS) for stroke severity.

Convert numbers between decimal, hexadecimal, binary, and octal instantly. Supports integers and fractions.

Place a heart failure patient in class I through IV by how much ordinary activity it takes to bring the symptoms on.

Free online video editor — trim, compress, convert, rotate, mute, crop, and resize videos in your browser. No upload, no signup, no watermark.

Convert between opioid doses to morphine milligram equivalents (MME).

Calculate cumulative cigarette smoking exposure in pack-years.

Padua score for VTE risk in hospitalized medical patients.

Generate beautiful color palettes with 28 strategies — color theory, moods, decades, nature, and culture. Lock, export, download.

Palliative Performance Scale (PPS) for hospice and palliative care prognosis.

Predict remaining weeks in advanced cancer from bedside findings alone: performance status, intake, edema, dyspnea at rest, and delirium. No labs needed.

PaP score for 30-day survival probability in palliative cancer patients.

Calculate the PaO2/FiO2 ratio (P/F ratio) and classify ARDS severity by Berlin criteria.

Complete reference for paper sizes — A series, US Letter, Legal, Tabloid, and more. Search and filter by name or dimensions.

Calculate fluid resuscitation volume for burn patients using the Parkland formula.

Rate erythema, induration, scaling and area involved for head, arms, trunk and legs; the regional weights add up to a PASI from 0 to 72.

Fit a headshot to the US 2 by 2 inch or EU 35 by 45 mm passport size, centered on white at print resolution and ready to send to a photo lab.

Generate cryptographically secure passwords with custom length, character sets, and strength check. Fully offline — no data ever leaves your browser.

Check password strength with entropy scoring and crack-time estimates. See what makes a password weak or strong.

Check if your PDF has accessibility tags, document title, language, and other a11y requirements.

View PDF page count, file size, author, creation date, and other metadata instantly in your browser.

Arrange PDF pages for booklet, saddle-stitch, or N-up printing. Runs entirely in your browser — no upload required.

Analyze PDF files for print-readiness issues — check page sizes, fonts, color spaces, and image resolution.

Flip through a document as an animated GIF. Give it a page range like 1,3-5 and every page becomes one frame in the loop.

Render document pages as JPG images. Type a page range or leave the box blank for everything, then save the pages as separate files.

Render document pages as lossless PNGs, which keeps text edges and line art sharp where JPG would smear them. Export one page or all of them.

Four bedside signs (appearance, eyes, mucous membranes, tears) put a child with gastroenteritis on a 0 to 8 dehydration scale that guides rehydration.

Estimate uncuffed and cuffed ETT size and depth by age in children.

Pediatric-adapted Glasgow Coma Scale for infants and children.

Pediatric drug infusion rate calculator in mcg/kg/min.

Pediatric drug infusion rate calculator in mg/kg/hour.

PEM Decoder — Parse PEM Blocks. Free, instant, runs in your browser.

Eight bedside criteria that, all negative in an already low-risk patient, let you close out pulmonary embolism without a D-dimer or a scan.

Calculate percentages, increases, decreases, proportions, and find original values before percentage changes. 9 calculation types.

Pulmonary Embolism Severity Index (PESI) for 30-day mortality.

Correct total phenytoin level for albumin and renal function (Sheiner-Tozer).

Combine photos into a horizontal strip, a vertical stack, or a 2x2 grid with an adjustable gap, then save the whole arrangement as one image.

Append the reversed frames to the end so the animation runs forward then back, giving a boomerang loop with no visible jump at the seam.

Generate placeholder images with custom dimensions, colors, and text. Download as PNG — no sign-up required.

Pneumonia Severity Index (PSI/PORT) for mortality risk in community-acquired pneumonia.

Position Size Calculator — Risk per Trade. Free, instant, runs in your browser.

Generate Postman Collection v2.1 JSON from URL, method, headers, and body. Import directly into Postman.

Convert horsepower to kilowatts, watts to BTU/h, and tons of refrigeration instantly with NIST factors. Free power converter in your browser.

Calculate your pregnancy due date from LMP, conception date, or IVF transfer using Naegele’s rule, plus current gestational age and trimester.

Convert psi to bar, kPa to psi, atmospheres, torr, and mmHg instantly with NIST conversion factors. Free pressure converter, runs in your browser.

10- and 30-year risk of CVD, ASCVD and heart failure by the AHA PREVENT equations.

Preview how your page looks when shared on social — paste HTML or enter OG fields manually. Cannot fetch live URLs.

Calculate selling price from cost and markup or margin. See profit per unit instantly.

Calculate gross profit, net profit, and margin percentage from revenue and costs. Updates instantly.

Test prompt templates with variables. Enter {{placeholders}} and preview the filled prompt instantly.

Convert pixels to rem and rem to pixels instantly. Configurable base font size with a common conversions reference table.

Generate styled QR codes with custom colors, shapes, and logos. Download as PNG or SVG.

Quick Sepsis-Related Organ Failure Assessment (qSOFA) for sepsis screening.

ISS stage, high-risk FISH cytogenetics and serum LDH combine into R-ISS stage I, II or III for myeloma prognosis and trial stratification.

Calculate RAG chunk count from token total, chunk size, and overlap. Plan vector indexing splits in your browser.

Score consciousness in infants and pre-verbal children on three responses, 3 to 11, where the standard Glasgow verbal items do not apply.

Ramsay scale for level of sedation assessment (1–6).

Pick random numbers in any range using the browser cryptographic random source. Integers or decimals, with or without repeats.

Five admission signs plus six at 48 hours give a mortality estimate for acute pancreatitis, with the score of 3 that flags severe disease.

Calculate induction and paralytic doses for rapid sequence intubation by weight.

Richmond Agitation-Sedation Scale (RASS) for ICU sedation assessment.

Estimate reading grade level with Flesch-Kincaid. Paste text to see grade level, reading ease, and word count.

Estimate how long it takes to read any text — shows slow, average, and fast reading times.

Rearrange PDF pages online — drag to reorder, rotate pages 90°, and delete pages you don't need. Free, runs in your browser with no upload needed.

Strip constant hiss, mains hum, and air conditioner rumble out of a recording, then download the cleaned voice track as an MP3.

Remove duplicate lines from a list keeping the first or last copy, or show only the duplicates, with a count of how many lines were dropped.

Remove duplicate rows from CSV files. Dedupe by entire row or a specific column. Instant, browser-based.

Redraw a photo without its EXIF block, dropping GPS coordinates, camera model, and capture time before you post it. The pixels stay untouched.

Compare renting vs buying a home over your time horizon — mortgage, taxes, maintenance, and appreciation against rent growth and investing.

Rebuild a GIF that stopped animating. Re-encode the frames, reset the loop flag, and download a copy players will actually open.

Enter a new width and every frame is scaled to match, so the animation survives the resize. Leave height blank to hold the aspect ratio.

Resize an image to an exact width and height, or scale by percent. Aspect-ratio lock, common presets, and a live output size estimate.

Resize videos to 1080p, 720p, 480p, or custom dimensions. Aspect-ratio lock available. Runs in your browser.

Flip the frame order of an animated GIF so it plays backwards, keeping the original size and per-frame timing intact.

Play an MP4, WebM, or MOV clip backwards and export it. Both picture and audio are reversed, so the soundtrack runs with the footage.

Generate a valid robots.txt file for your website. Control which bots can crawl your pages, block AI scrapers, and add your sitemap URL.

Grade rebleeding and mortality risk after an upper GI bleed, using age, shock and comorbidity alone or the complete score once endoscopy is done.

Seven CBC findings become a 0 to 7 sepsis screen for newborns, so you can risk-stratify while the blood culture is still pending.

Calculate return on investment percentage from initial cost and final value. See profit and ROI instantly.

Roman Numeral Converter. Free, instant, runs in your browser.

Risk of Paradoxical Embolism (RoPE) score for cryptogenic stroke with PFO.

Turn an animation 90, 180, or 270 degrees, or mirror it horizontally or vertically. All frames rotate together so the loop stays in sync.

Rotate a photo by 90 degree steps or any free angle, and mirror it horizontally or vertically. The canvas grows so no corner is clipped.

Rotate MP4, WebM, and MOV videos by 90, 180, or 270 degrees. Lossless — runs in your browser, no upload.

Add rounded corners or circle crop to images and animated GIFs. Pick radius and background color, then download.

Clip an image into a rounded rectangle. Set the corner radius anywhere from 1 to 50 percent and get a PNG back with the corners knocked out transparent.

Calculate running pace per km and per mile from distance and time, plus projected 5K, 10K, half and marathon finish times. Free, in your browser.

Calculate SAAG to differentiate portal hypertensive from non-portal hypertensive ascites.

Convert salary between annual, monthly, bi-weekly, weekly, daily, and hourly rates. Adjust for hours and weeks worked.

San Francisco Syncope Rule for predicting serious outcomes after syncope.

Riker Sedation-Agitation Scale (SAS) for ICU sedation.

Generate JSON-LD structured data for Article, Product, FAQ, HowTo, LocalBusiness, and more. Copy and paste into your HTML head.

Full-featured scientific calculator with trigonometry, logarithms, exponents, and expression history.

SCORAD Index for severity of atopic dermatitis.

Turn a diagonal size and aspect ratio into real width, height, area, and PPI for TVs and monitors — inches and centimeters. Free, in-browser.

PT-INR, platelet count and a capped SOFA subscore decide whether sepsis-induced coagulopathy is present, catching it earlier than the overt DIC criteria.

Calculate serum osmolality from sodium, glucose, and BUN.

Shipping Cost Calculator. Free, instant, runs in your browser.

Convert shoe, sneaker, and tennis shoe sizes between US, UK, EU, Brazil, Japan, Mexico, Australia, and cm. Men, women, and kids — instant and free.

Calculate final price after stacked Shopify discounts. Enter original price and multiple discount percentages.

Randomize the frame order of a GIF for glitch or chaotic effects. Full shuffle or partial shuffle every N frames.

Scramble the frame order for a glitchy remix of an animation. Each frame keeps its own delay, only the sequence gets shuffled.

Convert equivalent radiation dose between sieverts, millisieverts, and rems instantly — 1 Sv = 100 rem exactly. Free converter in your browser.

Calculate simple interest with I = P·r·t. Enter principal, rate, and time in years, months, or days — compare against annual compounding.

Six yes-or-no criteria split acute PE into low risk (all absent, roughly 1 percent 30-day mortality) and high risk, the first gate for outpatient treatment.

SKU Generator Online. Free, instant, runs in your browser.

Turn a headline into a URL-safe slug: accents folded to ASCII, punctuation dropped, optional stop-word removal, and truncation on a word boundary.

Crop and resize images for Instagram, Bluesky, Threads, Twitter/X, and more. Preset aspect ratios for every platform.

Correct serum sodium for hyperglycemia (Katz / Hillier formulas).

Sequential Organ Failure Assessment (SOFA) score for ICU organ dysfunction.

Alphabetize a list A to Z or Z to A, sort it numerically or by line length, reverse it, or shuffle it, with natural sort so item2 comes before item10.

Split a CSV file into multiple files by row count. Download-ready chunks for large datasets.

Cut a long animated GIF into smaller pieces by frame range and download each part on its own.

Split any image into a grid of tiles. Choose rows and columns, preview the result, and download all tiles as a ZIP.

Calculate SpO2/FiO2 ratio and equivalence to PaO2/FiO2 for non-invasive ARDS assessment.

Enter the rows and columns of a sprite sheet and it gets sliced on that grid into separate PNG tiles at the original pixel size.

Generate CREATE TABLE SQL from JSON schema or sample rows. Infer column types instantly. Free browser tool.

Format and beautify SQL queries instantly. Paste messy SQL and get indented, readable output.

Generate SQL INSERT statements from JSON arrays. Paste JSON and get copy-ready INSERT queries. Free, runs in your browser.

Minify SQL queries online. Remove comments and whitespace for smaller payloads. Free SQL minifier, runs in your browser.

SQL Query Builder — SELECT Generator. Free, instant, runs in your browser.

Convert GIFs to square 1:1 format with padding or crop — optimized for Instagram and social feeds. Free, in your browser.

Put non-square images on a square matte with custom background color. Perfect for Instagram grid posts.

SSL Certificate Decoder — Paste PEM. Free, instant, runs in your browser.

Calculate weighted average share price across multiple purchases. Enter shares and price per lot.

Optimize and minify SVG files in the browser. Remove metadata, clean attributes, and reduce file size instantly.

Rasterize SVG markup or an SVG file to PNG at any width and height, with retina multipliers and a transparent background.

SVG Viewer & Editor Online. Free, instant, runs in your browser.

Quick reference for Tailwind CSS classes — spacing, typography, colors, flexbox, grid, and more. Search and copy any class.

Generate a full Tailwind CSS color palette (50-950) from any hex color. Export as CSS variables or Tailwind config.

Hemoglobin, base excess, vitals, FAST and fracture pattern give the probability that a trauma patient will need massive transfusion, so the protocol fires early.

Calculate total daily energy expenditure from BMR and activity level, with calorie targets for weight loss, maintenance and weight gain.

Telegram animated stickers ship as .tgs Lottie files that almost nothing else opens. Drop one in and get a shareable GIF back.

Convert magnetic flux density between tesla, gauss, millitesla, and gamma instantly — 1 T = 10,000 G exactly. Free converter in your browser.

Test regular expressions with live match highlighting.

Paste robots.txt and test if a URL path is allowed or blocked for a crawler. Paste-only — cannot fetch live robots.txt.

Run several line transforms on one paste without switching tabs. Sort, dedupe, shuffle, and change case in a single pass over the same text.

A quick text editor with find & replace, case transforms (uppercase, lowercase, title case), slug generation, and more.

Convert text to binary, hex, and decimal representations instantly.

Convert date and time between time zones instantly. Compare multiple zones side by side.

Seven equal-weight criteria give the 14-day risk of death, MI or urgent revascularization in unstable angina and NSTEMI, steering the invasive versus conservative call.

Eight weighted variables give 30-day mortality after ST-elevation MI, from under 1 percent to well past 20, for triage and prognosis at the bedside.

Enter a tire size like 205/55R16 to get diameter, sidewall, and circumference — and compare two sizes with speedometer error. Free, in-browser.

Six prognostic parameters that estimate survival in metastatic spinal disease and point toward excisional, palliative, or conservative care.

Primary tumor grade plus visceral and bone spread give a 2 to 10 score that maps onto a surgical strategy, from wide excision down to supportive care.

TOML to JSON Converter. Free, instant, runs in your browser.

Convert newton-meters to foot-pounds, inch-pounds, and kgf·m instantly with exact NIST factors. Free torque unit converter in your browser.

Calculate total body iron deficit for IV iron replacement using the Ganzoni formula.

Calculate transferrin saturation index from serum iron and total iron-binding capacity (TIBC).

Transpose CSV Online. Free, instant, runs in your browser.

Trim and cut MP4, WebM, MOV videos online for free. Set start and end times, lossless — runs in your browser, no upload, no watermark.

Convert between px, pt, em, rem, and percent for CSS typography. Enter any value and see all units instantly.

Score vascular pattern, bleeding and erosions at the worst-affected segment for a 0 to 8 endoscopic index that beats the Mayo subscore on inter-observer reliability.

Browse, search, and copy Unicode characters by category. Find arrows, math symbols, emojis, and special glyphs instantly.

Convert between units of length, weight, temperature, data, speed, and more. Free, instant, no sign-up.

Convert Unix timestamps to human-readable dates and vice versa, with timezone support.

Calculate UPCR from a single urine sample to estimate 24-hour protein excretion.

Percent-encode text for a URL or decode %20 and %C3%A9 back to readable characters, with a toggle between encodeURIComponent and encodeURI.

Parse URLs into protocol, host, path, query, and hash components. Paste any URL for instant breakdown.

Build UTM-tagged URLs for Google Analytics campaign tracking. Add source, medium, and campaign parameters to any link.

Paste JSON-LD to validate syntax and required schema.org fields. Paste-only — cannot fetch live pages or replace Google Rich Results Test.

Paste sitemap XML to validate structure, URLs, and duplicates. Does not fetch live sitemaps or check HTTP status codes.

Add or remove VAT and sales tax from any amount. Preset rates for US, UK, EU, and custom percentage.

Scrub to a timestamp and save that exact frame as a PNG or JPG, which beats screenshotting the player and cropping the browser chrome off.

Take the jitter out of handheld footage. Motion is tracked across frames and the clip is re-rendered along a steadier path, no tripod required.

Pick a clip range, frame rate, and width, then export it as an animated PNG with lossless color and real alpha instead of GIF dithering.

Export a clip as animated AVIF, the smallest of the modern animation formats. Start, end, frame rate, and width are all set before encoding.

Convert MP4, WebM, and MOV videos to animated GIFs in your browser. Trim start/end, set FPS, adjust size — no upload to servers.

Take a still from a video without screen recording it. Export a single JPG or every frame at a fixed interval.

Encode video frames as JPEG XL instead of PNG or JPG, for photo quality stills at a fraction of the file size. Accepts MP4, WebM, and MOV.

Pull frames out of a video as lossless PNGs. Grab one exact moment, or export a whole sequence at the interval you set.

Convert video to text online for free. Transcribe MP4, WebM, MOV, and audio to text, SRT, or VTT in your browser — no upload, no signup.

Trim a clip range, set frame rate and output width, and export animated WebP. Sharper than a GIF at a fraction of the bytes for web embeds.

Read what an image file actually is before you use it: format, exact byte size, and pixel dimensions, all without the photo leaving your machine.

Vision Image Token Estimator. Free, instant, runs in your browser.

Convert liters to gallons, cups to milliliters, and every common volume unit instantly. Free volume converter that runs entirely in your browser.

Webhook Payload Inspector. Free, instant, runs in your browser.

Turn a stack of images into an endlessly looping animated WebP at the frame delay you choose, and land a much smaller file than the same GIF.

Ten clinical items, one of them worth minus two, give the pre-test probability of deep vein thrombosis and whether a D-dimer can settle it without ultrasound.

Seven findings put a suspected pulmonary embolism into low, moderate or high probability, so you know whether to send a D-dimer or go straight to CTA.

Convert wind speed between knots, mph, km/h, and m/s and read the Beaufort scale force with description. Free wind converter in your browser.

Count words, characters, sentences, and paragraphs in real time. Paste or type any text.

Working Hours Calculator. Free, instant, runs in your browser.

XML Formatter Online. Free, instant, runs in your browser.

Convert XML to JSON instantly in your browser. Handles attributes, nested elements, and repeated tags.

XML Validator Online. Free, instant, runs in your browser.

Convert YAML to JSON or JSON to YAML instantly in your browser. No upload, no sign-up.

YAML Validator Online. Free, instant, runs in your browser.

YouTube Timestamp Link Generator. Free, instant, runs in your browser.

Create an 8-page mini-zine imposition layout from a single sheet of paper. Upload a PDF and download the print-ready layout.