Decode JWT Token Online

Paste a JWT token to instantly decode and inspect the header, payload, and signature. Runs entirely in your browser — nothing is sent to a server.

Header
Payload
Signature (raw)
What is Decode JWT Token?
A JSON Web Token (JWT) is a compact, URL-safe token format defined in RFC 7519 for transmitting verifiable claims between two parties. It consists of three Base64url-encoded segments separated by dots: a header describing the signing algorithm (commonly HS256 or RS256), a payload containing the claims (such as sub, iss, exp, and custom data), and a signature that authenticates the previous two segments. JWTs are widely used for stateless authentication, OAuth 2.0 bearer tokens, and OpenID Connect ID tokens. A JWT decoder splits the token, Base64url-decodes each segment, and pretty-prints the JSON so developers can inspect claims and expirations without verifying the signature.
How to use
  1. Paste your JWT token into the input field.
  2. The header and payload are decoded and pretty-printed automatically.
  3. Click Copy on any panel to copy that section to your clipboard.
Frequently asked questions
Is it safe to paste my JWT into this tool?
Yes. All decoding happens in your browser. Your JWT is never sent to a server. The tool uses only JavaScript's built-in atob() function to decode the Base64url-encoded parts.
What is a JWT?
A JWT (JSON Web Token) is a compact, URL-safe token format used to transmit claims between parties. It consists of three Base64url-encoded parts: header, payload, and signature, separated by dots.
Can this tool verify the JWT signature?
No. Signature verification requires the secret key or public key used to sign the JWT. This tool only decodes the header and payload — it does not validate or verify the signature.
What does the exp claim mean in a JWT payload?
The exp claim is the expiration time, expressed as a Unix timestamp. If the current time is past the exp value, the token is expired. You can use the Unix Timestamp Converter tool to convert it to a human-readable date.
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