HMAC Generator
Generate HMAC signatures (SHA-1, SHA-256, SHA-384, SHA-512) from a message and secret key using the Web Crypto API — for signing webhooks, API requests and integrity checks.
Runs entirely in your browser — nothing is uploaded.
About HMAC Generator
Generate HMAC signatures (SHA-1, SHA-256, SHA-384, SHA-512) from a message and secret key using the Web Crypto API — for signing webhooks, API requests and integrity checks.
- Computes HMAC with the native Web Crypto API across four SHA variants.
- Outputs both hexadecimal and Base64 signatures, updated live.
- Your message and secret stay in the browser — never transmitted.
HMAC Generator is part of Upwwards Tools, a free collection of browser-based utilities built by the team at Upwwards. Like the rest of the suite, it's free, requires no sign-up, and keeps your data on your device.
Frequently asked questions
What is HMAC Generator?
Generate HMAC signatures (SHA-1, SHA-256, SHA-384, SHA-512) from a message and secret key using the Web Crypto API — for signing webhooks, API requests and integrity checks.
Is HMAC Generator free to use?
Yes — HMAC Generator is completely free with no sign-up, account or usage limits. It is part of the free Upwwards Tools collection built by Upwwards.
Is my data private when I use HMAC Generator?
HMAC Generator runs entirely in your browser. Everything you enter or upload is processed locally on your device and is never sent to a server, stored or logged.
Do I need to install anything to use HMAC Generator?
No. HMAC Generator works instantly in any modern web browser on desktop or mobile — there is nothing to download or install.