🔧 Online Tools
Free, efficient, ready-to-use developer tools that run entirely in your browser — no data ever uploaded to any server.
JSON Formatter & Viewer
The most powerful JSON tool you'll ever need. Supports JSON5 — comments, trailing commas, single quotes. Auto-fix broken JSON. Visual tree view with fold, expand, and copy subtree. No other online tool does this.
Password Generator
Generate strong random passwords with uppercase, lowercase, numbers, and symbols. Real-time strength rating.
🔥 PopularUnit Converter
Instant conversion between length, mass, temperature, volume, area, speed, and more.
ToolText Counter
Real-time character, word, line, and paragraph count. Supports mixed Chinese/English text analysis.
🔥 PopularCase Converter
One-click conversion to UPPER, lower, Title Case, camelCase, snake_case, PascalCase, and more.
✨ NewUUID Generator
Generate UUID v4 random identifiers with batch mode, one-click copy, and case toggle.
ToolColor Converter
Convert between HEX, RGB, HSL, and HSV formats with a color picker, history, and live preview.
✨ NewJSON Formatter
JSON5 parser with comments, trailing commas, auto-fix. Tree view with fold, expand, and copy subtree.
ToolQR Code Generator
Generate QR codes from any text or URL. Customize size, colors, and error correction level. Download as PNG. 100% client-side.
✨ New