HMAC Generator

HMAC Generator — runs 100% in your browser. No data is uploaded; nothing leaves your device.

Ad space

MessageSecret key

HMAC-SHA-256 (hex)

—

HMAC signatures via the Web Crypto API — used for webhook verification (Stripe, GitHub), API request signing and JWTs. Computed entirely in your browser.

Loading tool…

Reach for HMAC Generator whenever you need to hash text or files. Developers and sysadmins rely on it to verify download integrity, generate checksums for caching and deduplication, and learn how cryptographic fingerprints work — confirming a file or string was never altered.

How to embed HMAC Generator on your website

Add this free tool to your own site, blog or intranet — it's 100% free to embed. Paste this snippet where you want the tool to appear; it loads a clean, self-contained version with no ads or navigation.

<iframe src="https://tooljolt.com/embed/hmac-generator" title="HMAC Generator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px" loading="lazy"></iframe>

About HMAC Generator

HMAC Generator is a free online hashing tool that lets you hMAC Generator. It runs entirely in your browser — no sign-up, no uploads and nothing ever sent to a server — so it is fast, private and safe to use with sensitive data. Whether you are a developer, security professional, student or just curious, HMAC Generator gives you an instant, reliable result with zero setup.

How to use HMAC Generator

1Enter or paste the text (or drop a file) into HMAC Generator.
2The hash is computed instantly as you type — no button needed.
3Copy the resulting digest.
4Compare it against a published value to verify integrity.

Why use HMAC Generator?

✓100% free with no sign-up, accounts, watermarks or usage limits
✓Runs entirely in your browser — your input never leaves your device, ideal for confidential security data
✓Verify file and data integrity in seconds
✓Standards-correct output you can match in OpenSSL, Node.js or Python
✓Works on any device with a modern web browser, online or offline

Frequently asked questions

Can I reverse a hash with HMAC Generator?+

No. A hash is a one-way fingerprint — you cannot turn it back into the original input. HMAC Generator only computes the hash; recovering the input requires brute-forcing candidate values.

What is HMAC Generator useful for?+

Hashes verify file integrity, deduplicate data, index records and (for cryptographic hashes) underpin digital signatures and password storage. Compare the value here against a published one to confirm nothing was tampered with.

Is HMAC Generator free to use?+

Yes. HMAC Generator is 100% free with no sign-up, no account, no usage limits and no watermarks. Use it as often as you like.

Does HMAC Generator upload my data to a server?+

No. HMAC Generator runs entirely in your browser using JavaScript — nothing you type or upload ever leaves your device. That makes it safe to use with sensitive or confidential security data.