Decode JWT headers and payloads locally without uploading the token. Use it to inspect claims, expiration timestamps, issuers, audiences, and debugging context.
Privacy note: this tool runs in your browser; inputs are not uploaded. How privacy works
Signature is not verified. This decoder only reads the header and payload locally.
The decoded payload lets you inspect common claims such as sub, exp, iat, nbf, iss, and aud.
Input
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjMiLCJleHAiOjE3MzU2ODk2MDB9.signatureOutput
{
"sub": "123",
"exp": 1735689600
}JWT decoding runs in the browser. The token is split and Base64URL-decoded locally; this tool does not upload the token or verify signatures.
How LocalTools handles local and server-assisted toolsHow to inspect JWT headers, payloads, and claims without uploading the token.
Use exp, iat, and nbf claims to debug expired or not-yet-valid tokens.
A practical hub for choosing browser-local tools when working with JSON, JWTs, PDFs, images, hashes, and other data you hesitate to paste online.
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A safety checklist for decoding JWTs, understanding token sensitivity, and choosing local inspection over upload-based tools.
No. It decodes the header and payload locally, but cryptographic signature verification must be done with the correct key and validation rules.
Yes, unless the token is encrypted as a JWE. Standard JWT payloads are encoded, not encrypted.
exp is the expiration time claim. It is usually a Unix timestamp in seconds.
Avoid sharing production tokens. This decoder runs locally, but tokens should still be handled as sensitive credentials.