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HMAC Generator

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Generate HMAC digests for any text using SHA-256, SHA-1, or MD5 with a secret key.

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HMAC Generator

Generate Hash-based Message Authentication Codes (HMAC) for secure message authentication

The secret key used to sign the message

Enter secret and message
What is HMAC?

HMAC (Hash-based Message Authentication Code) is a specific type of MAC that involves a cryptographic hash function and a secret cryptographic key.

It provides both integrity and authenticity verification, ensuring that a message hasn't been altered and confirming the sender's identity.

Common use cases: API authentication, message integrity verification, secure communication protocols (TLS, SSH), and webhook signature validation.

A plain hash only proves a piece of content hasn't changed, but it doesn't prove who actually generated it, which is exactly the gap HMAC closes by mixing in a secret key known only to the sender and the receiver, the same mechanism a webhook signature header relies on to prove a payload genuinely came from the expected service rather than being forged by someone else entirely. This tool generates an HMAC digest from text using SHA-256, SHA-1, or MD5 combined with a secret key, producing the same value a legitimate sender's signing process would.

See more about the HMAC Generator

Useful for verifying that a webhook's signature header actually matches what a shared secret would produce, generating a signed payload for an API that requires HMAC authentication, or confirming two systems are computing the same signature from the same secret key.

Key features

  • Clean interface
  • Fast processing
  • No signup required
  • Works offline

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Quick answers for HMAC Generator

What does the HMAC Generator do?
Generate HMAC digests for any text using SHA-256, SHA-1, or MD5 with a secret key. The HMAC Generator is one of 900+ free developer tools on Toolblip - all open to use without a signup.
How do I use the HMAC Generator?
Open the HMAC Generator on this page, paste or upload your input, and the result updates as you type. Use the copy button to grab the output, or adjust options to tune the result. Nothing you enter leaves your browser.
Is the HMAC Generator free to use?
Yes. The HMAC Generator is a free online tool on Toolblip - no signup, no account, no hidden usage limits. It runs in your browser and works on desktop and mobile.
Is the HMAC Generator safe and private?
Yes. The HMAC Generator processes your data entirely client-side, so nothing you paste is uploaded or stored on any server. It's safe to use with internal snippets, private keys for debugging, or any other sensitive content you'd rather not send to a remote service.
What kind of output does the HMAC Generator produce?
The HMAC Generator produces clean, formatted output that you can copy or download with a single click. The output is tailored to the tool's purpose (formatted code, converted data, transformed text, or processed media) and is ready for immediate use in your project or workflow.
Does the HMAC Generator work on mobile devices?
Yes. The HMAC Generator is designed to work on any device with a modern browser, including phones and tablets. The interface adapts to smaller screens, and the core functionality (paste input, transform, copy output) works the same way regardless of your device.
Do I need to install anything to use the HMAC Generator?
No. The HMAC Generator runs entirely in your browser - no downloads, no accounts, no API keys. Paste your input, get the output, copy it back into your editor.
Can the HMAC Generator handle large input files or long text?
Yes. The HMAC Generator processes everything locally in your browser, so the only limit is your device's available memory. There are no arbitrary caps on input size, character count, or processing time that you would typically encounter with server-based tools.
Can I use the HMAC Generator offline?
Once the page has loaded, the HMAC Generator continues to work without an internet connection. Bookmark this page and return to it anytime - all logic runs locally.