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.

Keep your screen awake and stop screensavers from kicking in — while reading, cooking, or presenting. Uses the Screen Wake Lock API, with a wandering cursor for company.

Convert between SEK, USD, EUR, PHP, CNY, NOK, and PLN in one view. Type an amount in any field and the others update instantly, using daily European Central Bank rates.