Developer Tools Hub
A curated collection of free developer tools for HTML, CSS, JSON, and more.
HTML Code Runner
Write, run, and preview HTML code instantly in your browser. Our flagship tool — free, fast, and private.
HTML Tools
Essential tools for working with HTML markup.
HTML Viewer
Paste HTML source code and view it rendered with syntax highlighting. Useful for inspecting HTML snippets from external sources, reviewing template code, or debugging markup structure before deploying.
HTML Formatter
Automatically format and indent HTML code for readability. Turns messy, minified, or poorly indented HTML into clean, well-structured markup. Essential for code reviews and maintaining consistent style.
HTML Minifier
Remove unnecessary whitespace, comments, and redundant attributes from HTML to reduce file size and improve page load performance. Crucial for production optimization.
HTML Table Generator
Create HTML tables visually by specifying rows, columns, headers, and styling. Generates clean, accessible table markup that you can copy directly into your project.
HTML Beautifier
Clean up and beautify messy HTML code. Similar to formatting but focuses on making code more readable by fixing indentation, normalizing attribute quotes, and organizing tags.
HTML Encoder
Convert special characters (like <, >, &, ") into their HTML entity equivalents. Essential for safely displaying code snippets within HTML pages without the browser interpreting them as markup.
HTML Decoder
Convert HTML entities back to their original characters. Useful when working with encoded content from APIs, databases, or content management systems.
Developer Utilities
General-purpose developer tools for common tasks.
JSON Formatter
Format, validate, and beautify JSON data. Paste raw JSON and get properly indented, syntax-highlighted output. Essential for debugging API responses and configuration files.
Base64 Encoder
Encode text or binary data to Base64 format. Commonly used for embedding images in CSS, sending binary data in JSON, or encoding authentication credentials.
URL Encoder
Encode special characters in URLs to ensure they are transmitted correctly. Essential for building query strings, handling user input in URLs, and API integration.
CSS Minifier
Compress CSS files by removing whitespace, comments, and unnecessary characters. Reduce CSS file size for faster page loads and better Core Web Vitals scores.
JavaScript Beautifier
Format minified or obfuscated JavaScript into readable, well-indented code. Essential for debugging third-party scripts and reverse-engineering minified code.
How Developer Tools Help
Developer tools save time and reduce errors. Here's how they fit into typical workflows:
During Development
Use tools like the HTML Code Runner, HTML Formatter, and JSON Formatter during active development. They provide instant feedback, catch formatting issues early, and help you write cleaner code from the start.
During Debugging
When something breaks, tools like the HTML Viewer ("what does this HTML actually render?"), HTML Decoder ("what did this entity resolve to?"), and JavaScript Beautifier ("what does this minified script do?") are invaluable.
During Optimization
Before deploying to production, use the HTML Minifier and CSS Minifier to reduce file sizes. Smaller files mean faster load times, better user experience, and improved search engine rankings.
During Learning
Students and junior developers benefit enormously from interactive tools. The HTML Code Runner lets you experiment without fear — write code, see results, understand concepts through hands-on practice.