HMAC

Compute HMAC-SHA256/512 locally. Copy output or share a link.

Secret key

0 bytes

Message

0 bytes

Output

0 bytes

Algorithm HMAC-SHA256 HMAC-SHA512

Format Hex Base64

Uppercase (hex) Include key in shared link (unsafe)

This tool runs only in your browser. It does not upload your key or message anywhere.

Note: HMAC is for message authentication/integrity. It is not a password hashing algorithm.

Tip: “Share link” stores your options + message in the URL hash. Your key is NOT included unless you explicitly enable it.

About / 關於

HMAC — Compute HMAC-SHA256 or HMAC-SHA512 locally in your browser. Output hex/Base64, copy results, or share a link. Browser-only MVP.

Example: Use this tool to sanity-check numbers quickly, then share the link if you need to discuss with others.

FAQ: (1) Does it upload my data? No—runs in your browser. (2) Can I share results? Yes—use the share link feature. (3) Is it authoritative? Treat it as a convenience, not professional advice.

HMAC 產生器 — 在瀏覽器內計算 HMAC-SHA256 / HMAC-SHA512（hex/Base64）。可複製結果或分享連結。純前端 MVP。

範例：用這個工具快速試算與對照結果，需要討論時再把連結分享給對方。

FAQ： (1) 會上傳資料嗎？不會，計算在瀏覽器內完成。 (2) 能分享結果嗎？可以，用分享連結。 (3) 準確嗎？請把它當作便利工具，不是專業建議。