Online Tools & Utilities
Free, fast, and easy-to-use web tools for everyone. Streamline your workflow with our comprehensive suite of 133+ 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 toolsForce Converter
Convert between force units including newtons, pound-force, dynes, and kilogram-force. Essential for physics, engineering, construction, and automotive applications.
XML Formatter & Validator
Format, validate, and minify XML with clean indentation, error highlights, and quick copy/download
Molarity Converter
Convert between molarity units including mol/L, g/L, ppm, and % solution. Essential for chemistry labs, biology research, and pharmaceutical industry.
JavaScript Formatter & Minifier
Format, beautify, and minify JavaScript code with syntax-aware output and one-click copy
Astronomical Distance Converter
Convert between astronomical distance units including AU, light years, parsecs, kilometers, and miles. Essential for astrophysics, space exploration, and astronomy education.
Data Storage Converter
Convert between data storage units including bits, bytes, KiB, MiB, KB, MB, and more. Perfect for computing, file management, and digital storage calculations
Appointment Scheduler
Create simple appointment schedules, available time slots, and customer bookings
Time Converter
Convert between time units including seconds, minutes, hours, days, weeks, months, and years. Perfect for scheduling, project management, and daily calculations
Expense Tracker
Track daily business expenses by category, add notes, and export summaries for bookkeeping and tax prep
Frequency Converter
Convert between frequency units including Hz, kHz, MHz, GHz, RPM, and more. Perfect for electronics, audio engineering, and scientific calculations
Quote & Estimate Builder
Build clear quotes and estimates with itemized services, optional add-ons, and built-in totals for faster approvals
Torque Converter
Convert between torque units including N⋅m, lbf⋅ft, kgf⋅m, dyn⋅cm, and more. Perfect for engineering, automotive, and mechanical applications
Recently Updated
12 updatedHash Generator
Generate MD5, SHA1, SHA256, and SHA512 from text or file upload. File hash, checksum from file, verify file integrity. Client-side only.
Calendar
Manage and view events by day, week, or month in a smart calendar interface
Budget Planner
Take control of your finances with comprehensive budget planning. Track income, expenses, set budgets, and achieve financial goals with detailed analytics
Invoice Generator
Create professional invoices with client details, line items, taxes, discounts, and totals. Perfect for freelancers and small businesses
Quote & Estimate Builder
Build clear quotes and estimates with itemized services, optional add-ons, and built-in totals for faster approvals
Expense Tracker
Track daily business expenses by category, add notes, and export summaries for bookkeeping and tax prep
Appointment Scheduler
Create simple appointment schedules, available time slots, and customer bookings
Percentage Calculator
Calculate percentages, percentage increase/decrease, find percentage of a number, and solve percentage problems with step-by-step solutions
Average Calculator
Calculate mean, median, mode, range, standard deviation, and variance with step-by-step calculations and data visualization
Percent Error Calculator
Calculate percent error between experimental and theoretical values
Weighted Average Calculator
Calculate weighted averages where different values have different importance or weights
UUID Generator
Generate RFC 4122 compliant UUIDs (v1 and v4) with multiple output formats for databases, APIs, and applications
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