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JWT Generator and Signer

Create signed JWTs with HMAC, RSA, RSA-PSS or ECDSA using browser Web Crypto.

Convert in your browser · No sign-up

Supports HS/RS/PS/ES 256, 384 and 512. HS256/384/512 need at least 32/48/64 UTF-8 key bytes; RSA keys need 2048 bits. PEM uses PKCS#8 private keys.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Result

Add your input or load an example, then run the tool. Your result will appear here.

How to use

  1. Create signed JWTs with HMAC, RSA, RSA-PSS or ECDSA using browser Web Crypto.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

{"sub":"123"} + secret → signed JWS compact token

Details and limitations

Text stays in your browser; it is not sent to a conversion server.

Format references

Tool page updated: