Developer
JSON, encoding, hashing, regex, networking and other daily dev utilities.
JSON formatter & validator Pretty-print, minify and validate JSON with the error located for you. CSV ↔ JSON converter Convert between CSV and JSON in either direction, with delimiter detection. Base64 encoder & decoder Text and files to Base64 and back, URL-safe variant included. URL encoder & parser Percent-encode, decode, and break a URL into its parts and query pairs. JWT decoder Inspect a JSON Web Token’s header, payload and expiry. Nothing is sent anywhere. Hash generator SHA-1, SHA-256, SHA-384 and SHA-512 of text or a file, computed locally. UUID generator Version 4 and version 7 UUIDs, plus nanoid-style short tokens, in bulk. Password generator Random passwords and diceware passphrases, with a real entropy readout. Regex tester Live matches, capture groups and a replace preview, with a pattern cheat sheet. HTML entity encoder Escape and unescape HTML entities, with a searchable reference table. QR code generator A QR code for any link or text, rendered locally and downloadable as SVG or PNG. Bitwise calculator AND, OR, XOR, NOT and shifts, shown in binary, decimal and hex. chmod calculator Octal permissions to rwx and back, with the symbolic command to run. Subnet & CIDR calculator Network, broadcast, host range and mask for any IPv4 CIDR block. Aspect ratio calculator Solve for the missing dimension and identify common ratios. Markdown previewer Write Markdown, see it rendered, and copy the HTML out. Float (IEEE-754) inspector See exactly why 0.1 + 0.2 ≠ 0.3, bit by bit.