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HMAC Generator

Generate HMAC signatures using a secret key and hash algorithm for API authentication. Code never leaves your device — formatting and validation run locally in your browser.

100% Local Browser Native

How to Use the HMAC Generator

1. Set options

Adjust the settings for HMAC first.

2. Generate

Create your HMAC with one click.

3. Copy and reuse

Copy output where needed; each regeneration is a new roll.

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Frequently Asked Questions

Why HMAC over plain hash?

The secret key makes forgery impossible without it — plain hashes anyone can recompute.

Which algorithm?

SHA-256, SHA-384, or SHA-512 — pick one per run; SHA-256 is the standard default.

Hex or base64?

Hex only — the digest renders as lowercase hex to match API conventions expecting hex.

Is my input uploaded anywhere when using HMAC Generator?

No — hashing runs locally in your browser, free with no signup.

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Last updated October 2026