JavaScript Minifier.

Optimize Your Scripts. Free, powerful JavaScript minification tool to reduce file sizes, improve performance, and enhance website speed. Multiple compression levels and advanced optimization options powered by Terser.

JavaScript Minifier

Quick Examples

Click an example to load it into the minifier

Use cases

Real-world uses.

Website Performance Optimization
Reduce JavaScript file sizes to improve page load times and Core Web Vitals scores for better SEO rankings and user experience.
Production Build Preparation
Prepare JavaScript files for production deployment by removing unnecessary characters, optimizing code structure, and reducing file sizes.
Bandwidth Reduction
Minimize bandwidth usage and server costs by reducing JavaScript file sizes, especially important for high-traffic websites and mobile users.
CDN Optimization
Optimize JavaScript files before uploading to CDNs to maximize caching efficiency, reduce delivery costs, and improve global performance.
Code Obfuscation
Basic code obfuscation through name mangling and minification to make source code harder to read and understand.
Mobile Optimization
Reduce JavaScript file sizes for mobile users to improve loading speeds on slower connections and limited data plans.

How it works

Four steps.

  1. 01

    Paste your JavaScript code directly into the input area or upload a JavaScript file (.js, .mjs, .cjs, .jsx, .ts, .tsx) using the upload button.

  2. 02

    Click the Settings button to customize minification options. Choose compression level (Light, Medium, Aggressive), ECMAScript version, and toggle features like comment removal, console removal, and name mangling.

  3. 03

    View the minified JavaScript in real-time. Check the statistics panel to see file size reduction, compression percentage, and savings. Use side-by-side or tabbed view modes for comparison.

  4. 04

    Copy the minified JavaScript to your clipboard with one click, or download it as a new .js file. The tool automatically generates optimized, production-ready JavaScript.

Features

Advanced JavaScript Minification Features.

Our JavaScript minifier provides comprehensive optimization tools to reduce file sizes and improve website performance.

  • Lightning-Fast Minification

    Advanced JavaScript minification with multiple compression levels (Light, Medium, Aggressive) for optimal file size reduction using Terser engine.

  • Advanced Configuration

    Granular control over minification options including comment removal, console statement elimination, name mangling, and code compression.

  • Real-Time Statistics

    Live size comparison showing original size, minified size, reduction amount, and percentage saved with detailed metrics.

  • ECMAScript Support

    Support for all ECMAScript versions from ES5 to ES2022, ensuring compatibility with modern JavaScript features and syntax.

  • Easy File Management

    Upload JavaScript files (.js, .mjs, .cjs, .jsx, .ts, .tsx) and download minified output with one-click copy functionality.

  • Flexible View Modes

    Side-by-side comparison or tabbed interface for better code review, validation, and preview of minified output.

  • Safe Minification

    Preserves JavaScript functionality while maximizing compression. Option to keep class names and function names for debugging.

  • Performance Optimization

    Reduce load times, improve page speed, and enhance user experience by minimizing JavaScript file sizes for production.

  • Advanced Features

    Name mangling, code compression, console removal, and aggressive optimization options for maximum file size reduction.

FAQ

Questions.

Can't find an answer? Send us your question.

What is JavaScript minification and why is it important?

JavaScript minification is the process of removing unnecessary characters (whitespace, comments, etc.) and optimizing code structure to reduce file size. It's important because: Reduces file size, leading to faster page load times Improves website performance and user experience Decreases bandwidth usage and server costs Enhances SEO rankings through better page speed metrics Makes code harder to read, providing basic obfuscation

Will minification break my JavaScript code?

No, our JavaScript minifier uses Terser, a reliable and widely-used minification engine. It preserves all functionality while optimizing code. However, we recommend testing the minified JavaScript in your development environment before deploying to production, especially when using aggressive minification settings.

What's the difference between Light, Medium, and Aggressive minification levels?

Each level provides different compression: Light: Removes whitespace and comments while maintaining basic readability, no name mangling Medium: Standard minification with name mangling and code compression, removes console statements Aggressive: Maximum compression with unsafe optimizations, multiple compression passes, and advanced mangling for smallest file size

What is name mangling and should I use it?

Name mangling shortens variable and function names (e.g., calculateSum becomes a ) to reduce file size. It's safe for most code but can break code that relies on specific property names (like reflection or dynamic property access). You can keep class names and function names if needed for debugging or compatibility.

Does the tool support modern JavaScript features?

Yes! Our JavaScript minifier fully supports all ECMAScript versions from ES5 to ES2022, including ES6 classes, async/await, arrow functions, template literals, destructuring, spread operators, and all modern JavaScript syntax.

Can I remove console.log statements?

Yes! Enable the "Remove Console Statements" option in settings to automatically remove all console.log , console.error , and other console methods from your code. This is especially useful for production builds.

What file size reduction can I expect?

File size reduction varies depending on your JavaScript. Typically, you can expect 30-60% reduction with standard minification, and up to 70-80% with aggressive optimization settings. The actual reduction depends on factors like the amount of whitespace, comments, variable name lengths, and code structure.

Is the minified JavaScript production-ready?

Yes, the minified JavaScript is production-ready and can be used directly in your live website. However, we always recommend keeping a backup of your original JavaScript file and testing the minified version thoroughly before deploying to ensure everything works as expected.

Does it support TypeScript and JSX files?

While the tool accepts TypeScript (.ts, .tsx) and JSX (.jsx) files, it minifies them as JavaScript. For full TypeScript support, you should compile TypeScript to JavaScript first using a TypeScript compiler, then minify the resulting JavaScript. JSX files are treated as JavaScript and minified accordingly.

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