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Security & Cryptography

JWT Decoder / Encoder

Inspect JWT claims and sign or verify HS256 tokens.

◇ Your input is processed in your browser and is not uploaded.

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What you can do with JWT Decoder / Encoder

  • HS256/384/512 signatures
  • Expiration and not-before checks
  • Issuer and audience validation

How to use this tool

  1. Choose your encoding, algorithm or key settings.
  2. Enter text or choose a local file where supported.
  3. Generate and inspect the result; keep private keys and secrets confidential.
Do I need an account or a paid plan?

No. These free online tools include the advanced options above without an account or subscription.

Where is my data processed?

This tool processes your input in your browser. Your input is not uploaded to our servers. Some tools download an additional library before processing. Your input is not automatically saved to an account.

Keyboard shortcut: Ctrl+Enter (or Command+Enter) runs the first main action while you are working in the tool. Review generated code, documents and lookup results before using them.