Programming
Developer tools: JSON, Base64, hashes, UUID, regular expressions and more.
Tools in this category
Base64 encode / decode Encode and decode Base64 with full UTF-8 support — accents and emojis handled correctly. Paste text, copy the result instantly. Free, no sign-up. Diff checker — compare text Compare two texts line by line: additions in green, deletions in red, plus change counters. Runs 100% in your browser, so private text never leaves your device. Unix timestamp converter Convert Unix timestamps to readable dates in local time and UTC, or any date to seconds and milliseconds. Auto-detects the unit, right in your browser. JSON formatter & validator Format, validate and minify JSON right in your browser: 2 or 4 space indentation and syntax errors with exact line and column. Free, no sign-up. Password generator Generate strong random passwords in your browser with cryptographic randomness: length slider, symbols and an entropy strength meter. Free, no sign-up. Hash generator (MD5, SHA-256) Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text instantly in your browser, with one-click copy for every result. Free and no sign-up needed. QR code generator Create QR codes for URLs, WiFi or text with custom colors, size and error correction. Generated in your browser and downloadable as PNG or SVG. UUID generator Generate up to 100 random UUID v4 identifiers in your browser, in lowercase or uppercase, and copy one or all with a single click. Free, no sign-up. Regex tester Test regular expressions live: highlighted matches, capture groups and JavaScript flags. Runs fully in your browser, free, private and with no sign-up. Color picker (HEX, RGB, HSL) Convert colors between HEX, RGB and HSL in real time, with a tint and shade palette, complementary color and one-click copy for every value. Free, no sign-up.