Online Tools & Utilities
Free, fast, and easy-to-use web tools for everyone. Streamline your workflow with our comprehensive suite of 154+ 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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Popular Tools
Most used converters and utilities — free, instant, no sign-up
✨ New Tools
12 new toolsOpenAPI / 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.
Image Compressor
Compress and optimize images in your browser. Reduce file size with quality control, format conversion (JPEG, PNG, WebP), and optional resize. All processing client-side.
HTTP Headers Parser
Parse raw HTTP response headers into a key-value list. Paste from DevTools, copy single headers or the full block.
HTML Formatter
Format and minify HTML. Pretty-print or collapse whitespace and remove comments. Free, client-side, no sign-up.
GraphQL Formatter and Validator
Format and validate GraphQL documents (SDL and operations). Pretty-print and check syntax in your browser.
Escape Unescape
Escape and unescape text for JavaScript, JSON, HTML, XML, SQL, and regex. Safe string encoding for code and queries.
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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