Online Tools & Utilities
Free, fast, and easy-to-use web tools for everyone. Streamline your workflow with our comprehensive suite of 162+ utilities.
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From simple text tools to advanced scientific converters, we've got everything you need
Building a Production CLI Tool with Node.js
Master the art of building professional command-line tools. From scaffolding to publishing—learn best practices, testing, and deployment strategies used in production.
- Production-ready patterns
- Testing & deployment
- Real-world examples
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Popular Tools
Most used and highly rated developer utilities
✨ New Tools
12 new toolsJSON Viewer
Inspect JSON in an interactive tree. Expand and collapse nodes, copy paths, and view formatted JSON.
TOML ⇄ JSON Converter
Convert between TOML and JSON with validation and formatting. Free TOML to JSON and JSON to TOML for Cargo, pyproject.toml, and config files
ASCII / Unicode Lookup
Look up characters by code point or by character. Browse the ASCII table (0–127) with names and copy codes instantly
SemVer Comparator
Compare two semantic versions and check if a version satisfies a range (e.g. ^1.2.0). Free online version compare for developers.
Factorial Calculator
Calculate factorial values (n!) with exact results, digit counts, and reusable history
QR Code Decoder
Decode QR codes from images or live camera and parse URLs, WiFi credentials, vCards, and more
Exponents Calculator
Calculate powers with negative and fractional exponents plus expanded form guidance
User-Agent Parser
Parse browser, OS, and device from any User-Agent string. Debugging, analytics, and support.
HTTP Status Code Lookup
Look up HTTP status codes by number or name—see meanings, usage, and copy codes instantly
Cron Expression Parser
Parse cron expressions into readable schedules and generate cron strings with upcoming run previews
XML Formatter & Validator
Format, validate, and minify XML with clean indentation, error highlights, and quick copy/download
JavaScript Formatter & Minifier
Format, beautify, and minify JavaScript code with syntax-aware output and one-click copy
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