Hmac Sha256 Online
HMAC Generator is a free online Hash Tools tool that create keyed HMAC signatures with SHA-256/384/512 instantly in your browser. Paste your data, adjust the options and get the result in real time — no installation, no sign-up, and nothing is ever uploaded to a server. Written with API and build workflows in mind — outputs are copy-pasteable into code, curl commands and config files.
How to use
Using HMAC Generator takes three steps:
- Paste your data into the input box (or load the example).
- Configure the options to match your target format or scenario.
- Copy, download or inspect the output — it updates live as you type.
- Written with API and build workflows in mind — outputs are copy-pasteable into code, curl commands and config files.
Examples
payload-to-sign
Use cases
- Create keyed HMAC signatures with SHA-256/384/512.
- Because everything is computed client-side, HMAC Generator is safe to use with sensitive data such as API keys, tokens or private logs.
FAQ
What is HMAC Generator?
HMAC Generator create keyed HMAC signatures with SHA-256/384/512. It runs entirely in your browser, so your data stays private.
Is HMAC Generator free to use?
Yes. HMAC Generator is free, unlimited and works without registration or installation.
Does my data get uploaded?
No. All processing happens locally in your browser; nothing is sent to any server.
Runs 100% in your browser — your data never leaves your device.