Free online tools for developers, programmers, and coders
Format code, test regex, validate JSON, decode JWTs, parse user agents, and more - all in your browser. No installation required.
Instant results with no delays
All processing happens in your browser
Use directly in your browser
Free developer tools for everyday use - No downloads, no registration
Convert between binary, hex, octal, and decimal number systems
Test regular expressions with match highlighting and common patterns
Validate JSON syntax with error detection and location highlighting
Encode and decode URLs with component and full URL support
Decode JWT tokens to view header and payload information
Minify or beautify JavaScript, HTML, and CSS in one tool
Generate and parse cron expressions with human-readable descriptions
Parse .env files and export as JSON
Convert curl commands to JavaScript fetch() code
Build SELECT queries visually
Generate JSON Schema from sample JSON
Generate mock API response configs
Convert Unix timestamps to dates and dates to timestamps
Format and beautify HTML code with indentation and minification
Format CSS code with proper indentation and minification
Format and validate YAML config files with clean indentation
Format TOML config files like Cargo.toml and pyproject.toml
Beautify and validate GraphQL queries, mutations, and schemas
Compare two texts and find differences with highlighting
Parse user agent strings to extract browser, OS, and device info
Format, validate, and minify JSON code with syntax highlighting
Find and extract JSON paths to navigate JSON structures
Parse query strings and convert URL parameters to JSON
Format SQL queries with proper indentation and keyword formatting
Edit markdown with live HTML preview and conversion
Escape and unescape strings for JavaScript, HTML, JSON, Regex, and URL
Convert text to binary and binary to text with 8-bit encoding
Convert text to hexadecimal and hex to text
Parse URLs and extract all components including query parameters
View comprehensive browser information and capabilities
Encode and decode HTML entities for safe HTML content
Convert IP addresses to decimal and decimal to IP addresses
Extract domains from URLs with optional subdomain removal
Parse and create cookie strings with all attributes
View and edit localStorage data for the current domain
View and edit sessionStorage data for the current session
Compare and increment semantic versions
Validate version formats and test version compatibility
Learn practical uses for Base64 encoding and decoding in web development.
Comprehensive guide to developer utilities and coding tools.
Best practices for formatting and validating JSON in your projects.
Yes! All our developer tools are completely free to use. There's no registration required, no hidden fees, and no usage limits. You can use these tools as much as you need for your development projects without any cost or restrictions.
No account is required! All developer tools work immediately without any signup or login. Simply visit the tool, use it, and get instant results. Everything happens in your browser for maximum privacy and convenience.
Yes! All our developer tools use standard algorithms and libraries. However, for production applications, we recommend using established libraries and services. Our tools are perfect for quick testing, prototyping, and development workflows.
Most of our developer tools work offline once the page is loaded, as they process data entirely in your browser. However, some features like QR code generation may require an internet connection for external APIs.
Absolutely! All processing happens directly in your browser using client-side technology. Your data never leaves your device and is never uploaded to our servers. This means complete privacy and security - we never see, store, or have access to your data.
Yes! Our developer tools are fully responsive and work perfectly on mobile devices, tablets, and desktop computers. The interface adapts to your screen size, making it easy to use these tools on any device.