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HMAC Generator

Generate an HMAC signature with your key and algorithm.

Hashing & CryptoBrowser-only • PrivateFree

Secret keyAlgorithm

Message

HMAC

Output will appear here...

Privacy First: All processing happens locally in your browser. Your data never leaves your device and is never uploaded to any server.

About HMAC Generator

The HMAC Generator computes a keyed hash — HMAC — from your message and secret key using SHA-256, SHA-1, or SHA-512. HMAC is how APIs and webhooks sign requests so the receiver can verify both integrity and authenticity. Everything is computed in your browser, so your secret key never leaves your device. For plain unkeyed hashes use the SHA256 Generator, and compare results with the Hash Compare tool.

How to Use

1Open HMAC Generator and paste or type your data into the input area.
2Adjust any available options to match the result you want.
3Your output is generated instantly — no button-clicking required for most tools.
4Use the Copy or Download button to save your result.

Common Use Cases

Generating checksums to verify file and data integrity
Creating unique identifiers for records and keys
Hashing passwords and secrets during development
Comparing hashes to detect tampering or duplicates

Frequently Asked Questions

What's the difference between HMAC and a plain hash?

A plain hash proves data integrity. HMAC also mixes in a secret key, so only someone with that key can produce or verify the signature, which proves authenticity as well.

Which algorithm should I use?

HMAC-SHA256 is the common default for API request signing and webhooks. Choose SHA-1 only for legacy compatibility, and SHA-512 when a larger digest is required.

Is HMAC Generator free to use?

Yes. HMAC Generator is completely free with no sign-up, no subscription, and no usage limits. Every tool on CodeUtilityKit is free forever.

Is my data safe when I use HMAC Generator?

Absolutely. HMAC Generator runs entirely in your browser. Your input is processed locally with JavaScript and is never sent to, stored on, or logged by any server — so it is safe even for private or sensitive data.