Online Tools & Utilities
Free, fast, and easy-to-use web tools for everyone. Streamline your workflow with our comprehensive suite of 157+ 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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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 toolsJavaScript Formatter & Minifier
Format, beautify, and minify JavaScript code with syntax-aware output and one-click copy
XML Formatter & Validator
Format, validate, and minify XML with clean indentation, error highlights, and quick copy/download
Cron Expression Parser
Parse cron expressions into readable schedules and generate cron strings with upcoming run previews
Slug Generator
Convert titles and phrases to URL-friendly slugs: lowercase, hyphenate, strip diacritics for URLs, CMS, and SEO
HTTP Status Code Lookup
Look up HTTP status codes by number or name—see meanings, usage, and copy codes instantly
User-Agent Parser
Parse browser, OS, and device from any User-Agent string. Debugging, analytics, and support.
Factorial Calculator
Calculate factorial values (n!) with exact results, digit counts, and reusable history
Exponents Calculator
Calculate powers with negative and fractional exponents plus expanded form guidance
Invoice Generator
Create professional invoices with client details, line items, taxes, discounts, and totals. Perfect for freelancers and small businesses
Profit Margin & Markup Calculator
Calculate gross margin, net margin, and markup from revenue and costs in seconds
Sales Tax & VAT Calculator
Add or remove sales tax/VAT with support for multiple rates to price products accurately
Grocery List
Build a smart grocery list with categories, quantities, and mobile-friendly checkoff
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