developer
Free JWT Decoder Online
Decode JWT header and payload instantly.
local browser tool
Paste a token and decode it.
Introduction
JWT decoding helps you inspect claims like exp, iss, sub, and custom fields without sending your token to a server.
How To Use
Step 1
Paste the token
Insert the complete JWT string into the decoder.
Step 2
Review header and payload
Inspect algorithms, expiration time, issuer, and custom claims.
Step 3
Verify separately
Use this decoder for reading only; signature verification should happen in your auth stack.
Examples
Input
eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjMifQ.signature
Output
{
"sub": "123"
}FAQ
Does this verify the signature?
No. It decodes the token for inspection only and does not verify signatures.
Does this tool upload my input?
No. This tool runs in your browser for the first release, so your input stays local.