Free HMAC GeneratorSign messages with a secret key.

Compute an HMAC for API request signing or webhook checks.
Use a text or hex key and get hex or Base64.

SHA-2, SHA-3, MD5Text or hex keysNo upload

No sign-up No upload No limits

Read input as0 bytes

Algorithms

Classic

SHA-2

SHA-3

BLAKE

Checksums

Use a secret key (HMAC)KeyKey format

The key is empty: the result is an HMAC with an empty key.

Results

Format

SHA-256HMAC	…

Compare with an expected checksum

Text and files are hashed in this browser tab and never leave your device.

THREE SIMPLE STEPS

How to use the HMAC Generator

Enter the message

Paste the exact text that is signed, such as a webhook body.

Enter the key

Type the secret as text or hex and choose the algorithm, usually SHA-256.

Compare

Copy the HMAC, or paste the signature you received to check it.

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HMAC Generator FAQ

Is this HMAC generator free?

Yes, with no account and no limits.

Is my key sent anywhere?

No. The key and message stay in your browser tab, and the key isn’t saved.

Why doesn’t my signature match?

The message must be byte-for-byte identical, including spaces and line breaks, and the key format (text or hex) and output (hex or Base64) must match what the other side uses.

Which algorithms work with a key?

MD5, SHA-1, SHA-2, SHA-3, Keccak and RIPEMD-160 as HMAC; BLAKE2 and BLAKE3 with their own keyed mode.

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