JWT Token Decoder
Decode and inspect JSON Web Tokens (JWT) headers and payloads without transmitting secrets.
Encoded JSON Web Token (JWT)
About JWT Token Decoder
Inspect the claims, expiration dates (exp), issued-at (iat) timestamps, and token header algorithm of any JWT directly inside your browser without sharing secret keys.
How to Use JWT Token Decoder
Paste your encoded JSON Web Token (header.payload.signature).
The tool parses and formats the Header and Payload JSON structures.
Inspect claim expiration status and human-readable timestamps.
Supported Formats & Limits
- Supported Inputs: TEXT
- Guest Maximum Size: 25 MB
- Logged-in Max Size: 100 MB
- System Compatibility: Windows, macOS, Linux, iOS & Android
Privacy & Security Guarantee
This tool processes your files entirely inside your web browser using client-side JavaScript, WebAssembly, and Canvas APIs. Your document is never uploaded to any external server, guaranteeing total confidentiality.
Frequently Asked Questions
Is it safe to paste private auth tokens here?
Yes, decoding is performed purely via client-side base64url parsing; tokens are never sent to our server.