HMAC Generator
Generate HMAC-SHA256 signatures with a secret key. Free browser-based HMAC — no signup, runs locally.
Introduction
HMAC Generator is a free, browser-based utility in our Crypto & Security Tools collection. Create HMAC-SHA256 signatures with a secret key for webhook and API tests. HMAC Generator computes HMAC-SHA256 over a message with your secret so you can verify webhook signing locally. Keep secrets out of screenshots and shared notes. Everything runs locally in your browser — inputs stay on your device, with no account or upload required. Highlights include hmac-sha256 signatures.
Features
- HMAC-SHA256 signatures
- Message + secret inputs
- Local signing for tests
How to use
- 1Paste the message body.
- 2Enter the shared secret.
- 3Generate the HMAC and compare to the sender’s signature.
Example
Sign
Inputmessage + secretOutput
hmac hex digest
Benefits
- Run HMAC entirely in the browser with no signup or installation.
- Keep sensitive sample data private — processing never leaves your device.
- HMAC-SHA256 signatures
- Message + secret inputs
- Local signing for tests
- Pair it with Hash Generator and SHA-256 when your workflow needs adjacent utilities.
FAQs
Match the producer - hex and base64 are both common; check the API docs.
No. Nothing is uploaded.
In production code, use a constant-time compare helper.
Yes. HMAC on EverydayDevTools is free, with no account, watermarks, or usage caps for normal interactive use.
No. HMAC runs in your browser. Your input is processed locally and is not sent to EverydayDevTools servers.
Create HMAC-SHA256 signatures with a secret key for webhook and API tests. It fits everyday crypto & security tools tasks when you want a fast local utility instead of installing a CLI or opening a heavy IDE feature.
Core capabilities include: HMAC-SHA256 signatures; Message + secret inputs; Local signing for tests.
Developers often pair HMAC with Hash Generator, SHA-256. Open Related tools on this page for quick links.