Online Tools & Utilities
Free, fast, and easy-to-use web tools for everyone. Streamline your workflow with our comprehensive suite of 171+ 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
Find the Perfect Tool
Search through our collection of tools or browse by category to find exactly what you need
Popular Tools
Most used and highly rated developer utilities
✨ New Tools
12 new toolsBreak-even Calculator
Determine how many units you need to sell to cover fixed and variable costs
Inventory Reorder Point Calculator
Calculate reorder points based on lead time, average sales, and safety stock to avoid stockouts
Number Base Calculator
Add, subtract, multiply, and divide in binary, octal, decimal, or hexadecimal
Logarithm Calculator
Calculate log, ln, custom base logarithm, and antilog in one free calculator
JSON 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.
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