> codebench_TOOL: HomeLOCAL-ONLY⌘K Switch

Algorithm:

Output:

Key Format:

Secret Key

HMAC Output

Your key and message never leave your browser. All HMAC computation uses the WebCrypto API locally.

> codebench $Ctrl+Enter Run

What is HMAC Generator?

Compute HMAC (Hash-based Message Authentication Code) using WebCrypto API. Supports SHA-1, SHA-256, SHA-384, SHA-512 algorithms with hex or base64 output encoding. Key input as plain text or hex bytes. Perfect for verifying API webhooks and signatures. All processing runs entirely in your browser.

Key Features

100% client-side — your data never leaves your browser
No signup or installation required
Free and open to use, no usage limits