JWT Decoder
Decode JWT headers and payloads to inspect claims, expiry, and algorithms with signature highlighting and safe client-side parsing without uploads offline.
Decoding is local; 0 / 1,000,000 chars — nothing sent anywhere.
Header
Payload
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About the author
Written and maintained by the Tool4SaaS team. Every tool runs locally in your browser and is tested in-house for accuracy. Last updated: .
Frequently asked questions
No. It only decodes the payload for inspection; signature verification requires the secret.
No. Decoding happens entirely in your browser.
Yes, all processing happens locally in your browser and nothing is uploaded.
How to use JWT Decoder
- Paste token: Paste the full JWT (three dot-separated parts).
- Read decoded parts: Inspect the header and payload JSON.
- Copy: Copy the decoded header or payload.