D
DevMe
Security

HMAC Generator

Generate HMAC signatures using SHA-256 or SHA-512 with a secret key.

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What this tool does

HMAC Generator creates HMAC signatures from a message and secret key. It accepts message text plus a shared secret and returns SHA-based HMAC signatures. Use it for testing webhook signatures, API authentication, signed payloads and integration checks.

Related extensions and formats

These are the formats and values directly related to the HMAC Generator workflow: message text plus a shared secret becomes SHA-based HMAC signatures.

Hash-based message authentication code

HMAC

A keyed signature format used to verify that a message came from a holder of the shared secret.

Hash digest

Hash

A fixed-length value generated from input data, commonly used for checksums, comparisons and integrity checks.

Hexadecimal value

Hex

A base-16 representation used for bytes, hashes, colors, IDs and low-level encoded values.

How to use this tool

  1. 1Paste or enter message text plus a shared secret into HMAC Generator.
  2. 2Adjust the available options when the tool provides extra controls.
  3. 3Review SHA-based HMAC signatures, then copy or download the result.

Common use cases

  • Use message text plus a shared secret for testing webhook signatures, API authentication, signed payloads and integration checks.
  • Generate SHA-based HMAC signatures without installing external utilities.
  • Quickly check message text plus a shared secret before pasting it into code, documentation or integrations.
  • Keep sensitive data in the browser during quick development tasks.

Frequently asked questions

What is HMAC Generator used for?

It is used for testing webhook signatures, API authentication, signed payloads and integration checks, converting or analyzing message text plus a shared secret to produce SHA-based HMAC signatures.

What input can I use with HMAC Generator?

Use message text plus a shared secret. The expected result is SHA-based HMAC signatures.

Does HMAC Generator send my data to the server?

No. DevMe tools are designed to process data in the browser whenever possible.