JWT Decoder parses a JSON Web Token and shows its decoded header and payload as readable JSON. It does not verify signatures — it is meant for inspecting tokens during development and debugging. Paste a token, and the three parts (header, payload, signature) are split and decoded instantly in your browser.
Your data is processed entirely in your browser. Nothing is uploaded to any server.
Yes, JWT Decoder is 100% free and runs entirely in your browser.
No. Everything is processed locally on your device; nothing is uploaded.
No. JWT Decoder runs in any modern browser, no installation or signup required.
Yes. Your input stays in your browser and is never stored or transmitted.