Tools

Generate strong, random passwords with full control over length, casing, numbers, and symbols. Runs entirely in your browser using the Web Crypto API — nothing leaves your device.

Generate random v4 UUIDs in bulk, with optional uppercase, hyphen, and brace formatting. Copy individually or all at once — all done locally in your browser.

Pretty-print, validate, minify, and sort JSON with clear, line-and-column error messages. Choose your indentation — everything is parsed locally in your browser.

Decode a JSON Web Token to inspect its header, payload, and claims, with human-readable expiry status. Decode-only and fully local — your token never leaves your browser.

Estimate the token count of a prompt and what it will cost across Claude and GPT models, with editable pricing and input/output costs. Calculated entirely in your browser.

Compute SHA-256, SHA-1, SHA-384, and SHA-512 hashes of text or files, and verify against a known checksum. Files are hashed locally with the Web Crypto API — never uploaded.

Encode and decode Base64 text with full UTF-8 support and a URL-safe option. Swap directions in one click — everything runs locally in your browser.