Developer Tools
Format, encode and decode without leaving the browser.
- JSON FormatterFormat, minify, and validate JSON in your browser — pretty-print or compress with pinpoint error locations.
- Subnet CalculatorEnter an IP and CIDR prefix or subnet mask to instantly get network, broadcast, host range, and mask details.
- Diff CheckerCompare two texts line by line and see exactly what was added, removed, or unchanged — in your browser.
- UUID GeneratorGenerate cryptographically random RFC 4122 v4 UUIDs in bulk — copy one or all, in your browser.
- Unix Timestamp ConverterConvert Unix timestamps to human dates (UTC, local, ISO 8601) and back — instantly, in your browser.
- JSON ValidatorCheck if JSON is valid, pinpoint syntax errors by line and column, and see a structure diagnostic, in-browser.
- Regex TesterTest JavaScript regex live — see every match, capture group, and named group highlighted as you type.
- XML FormatterBeautify or minify XML instantly in your browser — no upload.
- JWT DecoderDecode a compact JWT header and payload locally, with a clear unverified warning.
- Excel Keyboard ShortcutsSearch practical Excel shortcuts by action, platform, and category, then copy the exact keys you need.
About these tools
Every tool in developer tools runs locally in your browser: files are processed on your device and never uploaded to a server. That makes them fast, private and safe to use with sensitive documents, at work or at home.