Hash / HMAC Generator & Verifier

Use this free online Hash / HMAC Generator & Verifier to calculate message digests, sign payloads with a shared secret, and compare expected signatures during API debugging.

Common hash and HMAC tasks

  • Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes for sample values, fixtures, and integration checks.
  • Generate HMAC signatures with SHA-256, SHA-384, or SHA-512 when testing webhook and API authentication flows.
  • Verify an expected HMAC signature using a timing-safe comparison.
  • Copy results as hexadecimal or Base64 output, with optional uppercase hexadecimal formatting.

Privacy note: Submitted values are processed only to produce the requested result and are not stored by this tool.

Mode
Paste the text or payload to hash or sign.
Required for HMAC generation and verification.
Paste a hexadecimal or Base64 signature to verify.
Output format