Verified demo token
Token signed with the demo secret bytebench-secret.
Decoded header, decoded payload, expiration, and a successful HS256 signature check.
Encoding Tools
JWT Decoder
Decode JWT headers and payloads locally, then verify HS, RS, and ES signatures with provided secrets or keys.
At a glance: This JWT decoder reads JWT header and payload data locally in your browser. It supports compact JWT tokens and can verify HS256/384/512, RS256/384/512, and ES256/384/512 signatures with the matching secret, public key, or certificate.
Your input is processed locally in your browser and is not uploaded to ByteBench servers.
Verify signature
Loading browser tool.
How to use this tool
- Paste or type your input into the tool area.
- Choose the mode or options that match your task.
- Review validation messages before copying the output.
- Use the example button when you want a known-good starting point.
Examples
Common use cases
- Inspect token claims during development.
- Check expiration timestamps.
- Verify HMAC-signed JWTs with a known secret.
- Verify RSA or ECDSA tokens with public keys or certificates.
- Debug malformed JWT payloads locally.
When to use this tool
Use this jwt decoder page when you need to decode JWT JSON and verify HS, RS, and ES signatures locally quickly during debugging, review, migration, or documentation work and want to keep raw input in your browser session.
If your task shifts, Base64 Decode and Encode and Unix Timestamp Converter are usually the next useful tools.
Input and output expectations
- Expected input shape: Paste the exact value you want to inspect, decode, parse, or transform, including delimiters when relevant.
- Typical output: A converted or parsed representation you can copy into debugging notes, requests, tests, or scripts.
- Quick input example: Token signed with the demo secret bytebench-secret.
- Quick output example: Decoded header, decoded payload, expiration, and a successful HS256 signature check.
Common mistakes to avoid
- Using decode mode when the input is already decoded.
- Mixing URL-safe and standard variants in encoded data.
- Comparing transformed output without confirming source mode.
Notes and edge cases
Signature verification requires the correct secret or key material and matching algorithm. Verification confirms integrity for the provided key, but token acceptance still depends on issuer, audience, clock skew, revocation, and application trust policy.
For privacy-sensitive data, keep using the tool in a trusted browser session and avoid pasting secrets into shared screens, screenshots, browser extensions, or remote support sessions.
FAQ
Does this JWT decoder upload my input?
No. This JWT decoder runs in your browser and does not send your input to ByteBench servers.
What input format works best in this JWT decoder?
Use clean JWT compact tokens input and run the example first when you want a known-good baseline. If your pasted data came from logs or docs, remove accidental wrappers before validating or converting.
How should I validate results from this JWT decoder?
Review the status message, compare output with expected behavior, and run one quick edge-case check. ByteBench helps with utility work, but production-critical output should still be verified in your project pipeline.