Crypto

HMAC Generator

Compute HMAC-SHA256, HMAC-SHA384, HMAC-SHA512. Hex or Base64 output. 100% client-side — secret never leaves browser.

How to use

  1. Enter a domain, URL, or value relevant to HMAC Generator.
  2. Run the check and review the output carefully.
  3. Apply recommended fixes, then run the check again to verify.

Common use cases

  • Pre-deployment validation for HMAC Generator.
  • Incident triage when security checks fail in production.
  • Periodic security review as part of technical SEO and hardening.

Common issues and fixes

Key mismatch

Verification fails if secret differs. Both sides must use same key.

Timing attack

Use crypto.timingSafeEqual when comparing HMACs to prevent timing attacks.

Recommended remediation

Use HMAC for webhook signatures, JWT, API auth. Keep secret secure. Prefer SHA-256+.

FAQ

Is HMAC Generator free to use?

Yes. This tool is free and can be used without account registration.

Do you store submitted values?

Only the minimum processing needed for the check. For client-side tools, data stays in your browser.

How should I use these results?

Use the output as a diagnostic baseline, apply fixes in your stack, then re-run the check to confirm remediation.

Related security tools

JWT Decoder

Decode JSON Web Tokens to inspect header, payload, and expiration without a secret key.

Base64 Encoder / Decoder

Encode and decode text to and from Base64 format. Fully client-side — your data never leaves the browser.

Hash Generator

Generate MD5, SHA-256, and SHA-512 cryptographic hashes from any text input. 100% client-side.