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Generate SHA-256, SHA-384, and SHA-512 hashes.
- On your device
- No signup
Private on your device
Your information stays on your device and is not uploaded.
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Enter a message and secret key to compute HMAC-SHA256, HMAC-SHA384, or HMAC-SHA512 hex digests with WebCrypto on your device. Secrets are never uploaded.
How to use this tool
Open the HMAC Generator form on this page, enter the values or file required for your task, and run the tool. Review the results panel and adjust inputs as needed. Your data stays on your device and is not uploaded.
How it works
Enter a message and secret key, then choose HMAC-SHA256, HMAC-SHA384, or HMAC-SHA512. The hex digest is generated with WebCrypto on your device.
Limitations
Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.
Privacy and file handling
Your data stays on your device and is not uploaded.
FAQ
Frequently asked questions
Is HMAC Generator free?
Yes. It is free to use and you do not need to sign in or create an account.
Is my data private?
See the privacy note on this page. Many tools run on your device; some heavier file tools may use secure temporary processing when required.
Can I use HMAC Generator on mobile?
Yes. Open this page on your phone or tablet, enter your inputs, and use the on-screen controls.
Related pages
- Browse all free online tools on Utilnivo
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- Hash Generator — Generate SHA-256, SHA-384, and SHA-512 hashes.
- JWT Verifier — Verify JWT signatures locally with WebCrypto—HS*, RS*, and ES256.
- File Checksum Calculator — Generate SHA-256 file checksums on your device.
- Base64 Encoder & Decoder — Encode and decode text with Base64.
- JWT Encoder — Encode and sign JWTs with HS256 on your device.
- JSON Formatter — Format, minify, and validate JSON with optional key sorting.
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