Code Formatter & Minifier – Free Online Tool
Beautify or minify JSON, JavaScript, CSS, and HTML code online for free. Instant code formatter, beautifier, and minifier with syntax highlighting.
Free Online Code Formatter & Beautifier
Our unified code formatter and beautifier is a must-have tool for web developers. Instantly transform messy, minified, or poorly indented code into clean, readable output with proper formatting. Supports JavaScript, HTML, CSS, and JSON with intelligent syntax detection. Whether you need to beautify a minified production file or format a JSON API response for debugging, our tool handles it in milliseconds.
JSON Formatter & Validator
Paste any JSON payload to instantly format it with proper indentation, syntax highlighting, and validation. Our JSON formatter detects and reports syntax errors, making it easy to debug API responses, configuration files, and data structures. Supports JSON pretty-printing with customizable indentation levels.
JavaScript, CSS & HTML Minifier
Reduce your file size for production with aggressive minification. Our minifier removes all unnecessary whitespace, comments, and newlines from JavaScript, CSS, and HTML files without changing functionality. Deploy smaller bundles for faster page loads and better Core Web Vitals scores.
Powered by Monaco Editor — VS Code in Your Browser
Built on the Monaco Editor engine (the same editor that powers Visual Studio Code), you get professional-grade syntax highlighting, code folding, intelligent line wrapping, and a premium dark mode UI. Upload files directly or paste code for instant formatting. Your code never leaves your browser — 100% private and secure.
Upload, Format & Download — One-Click Workflow
Load your local .js, .css, .html, or .json files directly into the editor using the Upload button. Instantly beautify or minify the code, then download the processed result with a single click. Perfect for batch-processing configuration files, cleaning up vendor scripts, or preparing optimized assets for deployment.
Frequently Asked Questions
Everything you need to know about the Code Formatter & Minifier.
Which programming languages are supported?
Our code formatter supports JavaScript (ES6+), HTML5, CSS3, and JSON. Each language uses optimized parsing and formatting rules for the best possible output quality.
How does the code minification work?
Minification removes all unnecessary characters (whitespace, comments, newlines) from your source code without changing its functionality. This produces a compact file that loads faster in browsers, improving website performance and Core Web Vitals scores.
Is my code private and secure?
Absolutely. All formatting and minification runs entirely in your browser using client-side JavaScript. Your code is never sent to any server, making it completely safe for proprietary code, API keys, and sensitive configurations.
Can I upload files directly?
Yes. Use the Upload button to load .js, .css, .html, or .json files directly into the editor. After formatting or minifying, download the processed result with a single click.
What is the difference between formatting and beautifying?
Formatting and beautifying are the same operation — both transform minified or messy code into clean, properly indented, readable output. Minifying is the reverse: it compresses readable code into the smallest possible file for production deployment.