Online Tools & Utilities
Free, fast, and easy-to-use web tools for everyone. Streamline your workflow with our comprehensive suite of 160+ 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 toolsYAML Formatter and Validator
Format and validate YAML with consistent indentation. No conversion to JSON.
HTTP Request Builder
Build HTTP requests with URL, method, headers, and body. Send or copy as cURL or fetch snippet.
HTTP Headers Parser
Parse raw HTTP response headers into a key-value list. Paste from DevTools, copy single headers or the full block.
SSL Certificate Checker
Check SSL/TLS certificate validity, issuer, subject, and SANs. Paste PEM or upload .pem/.crt. Client-side only.
Color Contrast Checker
Check WCAG contrast ratio between foreground and background colors. See AA and AAA pass/fail for normal and large text.
Markdown Table Generator
Convert CSV or tab-separated data into a Markdown table. Paste data, choose alignment, copy the result.
Unit Price Calculator
Calculate price per unit from total price and quantity. Compare two products to see which is cheaper per oz, kg, or any unit.
IP Subnet Calculator
Calculate subnet mask, network address, usable range, and broadcast from CIDR notation (e.g. 192.168.1.0/24).
JSON Schema Validator
Validate JSON data against a JSON Schema. See errors with path and message.
.env Formatter and Validator
Format and validate .env files. Normalize KEY=value, optional sort, check for duplicate keys.
GraphQL Formatter and Validator
Format and validate GraphQL documents (SDL and operations). Pretty-print and check syntax in your browser.
XML Schema (XSD) Validator
Check that your XML document and XSD schema are well-formed. Paste both and validate syntax.
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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