GUIDE · 2026-07-23
How to use the JWT Decoder
Quickly inspect JWT claims while keeping the distinction between decoding and signature verification clear. The result follows “JWT = Base64URL(header) . Base64URL(payload) . signature” and is designed for situations such as inspect access-token claims during development. Inputs are handled immediately in your browser with no account required.
How it works
Most processing stays in your browser instead of sending inputs to our server. Verify important financial or contractual decisions against an authoritative source.
Useful examples
- Inspect access-token claims during development
- Read exp and iat timestamps as dates
- Find which token segment has invalid formatting
Frequently asked questions
Does this verify the signature?
No. It only decodes the contents and does not verify the signature with a secret or public key.
How is expiration determined?
The exp claim is treated as Unix seconds and compared with the current time.
Should I paste a production token?
Processing stays on-device, but tokens may be sensitive. Avoid real production tokens on shared devices.