← Blogby Marcell Almeida

How to check password strength online

Type a password — see strength score, estimated crack time, and specific improvement tips.

Weak passwords are still the #1 breach vector. The Password Strength Checker scores length, character diversity, and common-password patterns — without sending your password anywhere.

Try it — type a password to check strength

Open full tool →

How it works

  1. Type or paste a password — checking happens locally.
  2. Read the score — Very weak through Very strong.
  3. Follow the tips — specific suggestions for what to improve.

Your password never leaves your device

Strength analysis runs entirely in JavaScript. No network request, no logging. Safe to test real passwords you are considering.

Use a password manager

For production passwords, use the Password Generator with crypto.getRandomValues() and store in a password manager.

The How to check password strength online is free, runs locally, and never sends your data to a server. More developer tools at maratool.com.