JWT Decoder
Paste a JWT to instantly decode its header and payload as readable JSON.
Pourquoi utiliser cet outil ?
A JWT looks like an opaque string, but its header and payload are just Base64-encoded JSON. This tool decodes both parts instantly so you can inspect the claims (expiry, user id, roles...) without leaving your browser or exposing the token to a server. Note: this only decodes the token, it does not verify its signature.
Why it's free
A discreet ad banner covers hosting costs — that's the whole business model. No account to create, no usage limit, no paid tier unlocking the real result. Calculations run in your browser, so your numbers, dates and text never leave your device.
How our tools work