Browser-first · No sign-up
JWT Decoder
Decode JWT header and payload safely in your browser.
No uploads. Everything runs locally in your browser.
Header
{
"alg": "HS256",
"typ": "JWT"
}Payload
{
"user": "alice",
"iat": 1680000000
}How to use
- Paste your JWT.
- Header and payload decode instantly.
- No secrets required.
Features
- Client-side decode.
- Base64url safe handling.
- No token sent anywhere.
FAQ
Is it safe?
Yes, decoding runs locally. Do not paste secrets if unsure.