Online Tools & Utilities
Free, fast, and easy-to-use web tools for everyone. Streamline your workflow with our comprehensive suite of 159+ 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
Ship a production-ready CLI in days, not weeks.
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, CI, and npm publish
- 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 converters and utilities — free, instant, no sign-up
✨ New Tools
12 new toolsRetrospective Generator
Generate timeboxed retro agendas: Start/Stop/Continue, 4Ls, Mad/Sad/Glad, Sailboat. Set team size and duration.
CPS Test
Test your clicks per second (CPS) with a timed click test. Choose 5 or 10 seconds and click as fast as you can. Free online click speed test.
Click Counter
Free online click counter. Count clicks with a simple +1 button. Add an optional label and reset anytime.
Scoreboard
Free online scoreboard for two teams. Add points with +1, +2, +3 buttons. Customize team names and reset anytime.
Bar and Line Graph Maker
Create bar charts and line graphs online. Enter labels and values, choose bar or line chart. Free online chart maker.
OpenAPI / Swagger Spec Validator
Validate OpenAPI 3.x and Swagger 2.0 specs (YAML or JSON). Check required fields and structure.
MIME Type Lookup
Look up MIME type from file extension or extension from MIME type. Browse common types.
Meeting Agenda Generator
Create copyable agendas for standups, sprint planning, retros, 1:1s, and kickoffs. Set duration and project name.
Markdown Table Generator
Convert CSV or tab-separated data into a Markdown table. Paste data, choose alignment, copy the result.
JSON Schema Validator
Validate JSON data against a JSON Schema. See errors with path and message.
IP Subnet Calculator
Calculate subnet mask, network address, usable range, and broadcast from CIDR notation (e.g. 192.168.1.0/24).
INI Formatter and Validator
Format and validate INI config files. [section] and key=value, optional sort, no duplicate keys.
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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