Convert tools

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.

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

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.

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

FAQ

JWT Key Generator — What are the supported inputs and limits?

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.

Format references

Tool page updated: