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Base64 Encode / Decode Base64URL Encode / Decode URL Encode / Decode HTML Encode / Decode Unicode Escape / Unescape Hex Encode / Decode Hash Generator HMAC Generator
Browser-based tool

HMAC Generator

Generate keyed HMAC signatures with SHA-1, SHA-256, or SHA-512 for webhook testing, signed requests, and auth debugging.

HMAC uses a shared secret. Keep real production secrets out of screenshots and shared demos.

FAQ

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Is this HMAC generator free?

Yes.

Which HMAC algorithms are supported?

The tool supports HMAC-SHA1, HMAC-SHA256, and HMAC-SHA512.

Is my secret key uploaded?

No. Message and secret processing stay in the page.

What is the output format?

The generated signature is returned as a hexadecimal string.

Can I verify a webhook signature with this?

Yes. It is useful for reproducing the expected HMAC so you can compare it with what the provider sent.

Should I use SHA-256 by default?

Usually yes. HMAC-SHA256 is a strong default unless a specific integration requires another algorithm.

How To Use It

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What HMAC is used for

HMAC combines a message with a shared secret to create a signature another trusted system can verify.

That is why it shows up so often in webhooks, signed APIs, and partner integrations.

Protect real secrets

Even on a local page, production secrets still should not end up in demos, recordings, or shared screens.

Use test keys whenever you can and keep real signing secrets out of casual debugging.

Where HMAC helps developers most

This is most useful when you are checking webhook verification, reproducing signing logic, or comparing browser output with backend output.

It is also handy when vendor docs give you a signing recipe and you want to test it before writing application code.

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