TOOL COLLECTION

Security Tools

Inspect JWT data, calculate hashes, generate passwords, and work with security formats locally. All listed tools keep supported input on your device.

Available Security Tools

Calculate the CRC32 checksum of UTF-8 input.

使用 CompressionStream 壓縮 UTF-8 文字，結果為 Base64。

將 Base64 Gzip 資料還原為 UTF-8 文字。

Compare a local SHA digest with strict expected lowercase hex. SHA-1 is compatibility only; this is not an authentication service.

Calculate HMAC SHA-1. Input must be JSON with message and key.

以瀏覽器 Web Crypto 計算 HMAC SHA-256。

Calculate HMAC SHA-384. Input must be JSON with message and key.

Calculate HMAC SHA-512. Input must be JSON with message and key.

Verify an HMAC locally with Web Crypto and strict expected lowercase hex; this is not an authentication service.

Generate C# classes with System.Text.Json property names.

Inspect JWT claims and expiry without verifying its signature.

讀取 JWT 標頭與 Payload；不驗證簽章。

Calculate SHA-1 locally. SHA-1 is retained for compatibility, not for new security designs.

使用 Web Crypto 在本機計算 SHA-256。

Calculate SHA-384 locally with Web Crypto.

Calculate SHA-512 locally with Web Crypto.

使用 Web Crypto 產生隨機密碼。

Use these tools without creating an account or uploading source files. Open a tool, paste the required text, run the operation, and copy the result.