Security tools
Hash, decode, and inspect security-related values locally in the browser.
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Security tools
Tools available: 4HMAC Generator
Compute HMAC-SHA256 safely in your browser. Keys and messages are never sent or stored. Supports Text/Hex/Base64 input and Hex/Base64 output formats.
JWT Decoder
Paste a JWT to decode header/payload instantly. No signature verification is performed. exp/iat/nbf are shown as Unix time and datetime (UTC/local).
SHA-256 Hash Calculator
Calculate SHA-256 directly in your browser. Generate and verify checksums from text and local files. Your data is not uploaded (Web Crypto API).
Password Generator
Generate passwords locally using secure random values. No server transmission. Supports length, character sets, exclusions, copy, and strength estimation.