JWT Decoder
Decode JWT tokens and inspect header, payload, and signature. Runs locally — your tokens stay private.
How to use JWT Decoder
- 1Paste your JWT
Paste the full JWT (three base64url parts separated by dots).
- 2View decoded payload
Header and payload are decoded and pretty-printed. Signature is shown raw.
Frequently asked questions
Does this verify the JWT signature?+
No — this is a decoder only. Verifying a signature requires the issuer’s public key or secret.
Is my JWT sent anywhere?+
No. Decoding happens in your browser. Treat any JWT as a secret regardless.
Related tools
JSON Formatter
Format, beautify, and validate JSON online. Free, fast, runs entirely in your browser.
JSON Validator
Validate JSON syntax online with clear error messages and line numbers. Free and private.
Base64 Encoder
Encode and decode Base64 strings online. UTF-8 safe, browser-only — your data never leaves your device.