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HMAC Generator

Compute HMAC-SHA256, HMAC-SHA384 or HMAC-SHA512 for UTF-8 text and a key.

Convert in your browser · No sign-up

The key is interpreted as UTF-8 text, not hex or Base64. The message and key remain in the browser.

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. Compute HMAC-SHA256, HMAC-SHA384 or HMAC-SHA512 for UTF-8 text and a key.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

HMAC-SHA256("key", "The quick brown fox jumps over the lazy dog") → f7bc83f4…

Details and limitations

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

Format references

Tool page updated: