HMAC Generator

Compute HMAC signatures with SHA-1, SHA-256, SHA-384, or SHA-512 for API debugging.

Algorithm

Case

Key

Message

HMAC-SHA-256

HMAC will appear here.

Step by step

How to use HMAC Generator

1
Enter the shared key, message, hash algorithm, and output encoding required by the integration.
2
Calculate the keyed digest using the browser cryptography implementation.
3
Compare the result byte-for-byte with the signature produced by the other system.

Capabilities

What this tool handles

Four SHA algorithm options
Web Crypto API for secure hashing
Useful for API signature debugging

Common uses for HMAC Generator

Debug webhook and API signature examples without sending the secret elsewhere.
Check whether mismatches come from encoding, algorithm, message, or key differences.

What to check before using the result

Production signature verification must also use constant-time comparison, replay protection, correct canonicalization, and secure secret storage.

Privacy and accuracy

Questions about HMAC Generator

Does this tool upload my input?

The conversion or analysis runs in your browser. The application does not intentionally send the value you enter to a processing API. Standard hosting infrastructure can still receive request metadata when the page loads; see the privacy page for details.

Can I rely on the output without checking it?

Use the result as a focused development aid and verify it in the system where it will be used. Test representative edge cases and confirm the destination uses the same format, standard, and assumptions described on this page.

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