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JWT Key Generator

Generate HMAC secrets, RSA key pairs or ECDSA key pairs locally.

Convert in your browser · No sign-up

Exports private PKCS#8 and public SPKI PEM. HMAC output is a random Base64url text secret to use literally. Keys are displayed only and not saved automatically.

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. Generate HMAC secrets, RSA key pairs or ECDSA key pairs locally.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

P-256 → PKCS#8 private PEM + SPKI public PEM

Details and limitations

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

Format references

Tool page updated: