David Clark
works fine
no issues, minifies correctly. could use more options
JavaScript Minifier & Compressor
Compress and optimize your JavaScript code to reduce file size and improve website performance. Remove unnecessary characters while preserving functionality. Save up to 60% on file size.
⚠️ Warning: Always keep your original source files. Test minified code before deploying to production.
Loading Engine...
Drag & drop JavaScript file here or click to upload
Supports .js files (max 5MB)
Input JavaScript
Minified Output
Recent Minifications
No recent minifications
About JavaScript Minifier
JavaScript Minifier is a free online tool that compresses your JS code by removing unnecessary characters while preserving its functionality. Minification is an essential step in modern web development that significantly improves website performance and user experience.
What Does JS Minification Do?
Our JavaScript Minifier performs several optimization techniques:
- Removes comments: Strips single-line (//) and multi-line (/* */) comments
- Eliminates whitespace: Removes unnecessary spaces, tabs, and line breaks
- Removes console statements: Deletes debugging console.log, console.warn, etc.
- Removes debugger: Removes debugger statements left in code
- Variable mangling: Optionally shortens identifier names for maximum compression
- Dead code elimination: Removes unreachable code paths
Performance Impact
60%
Average Size Reduction
3x
Faster Parse Time
25%
SEO Improvement
Advanced Minification Engine
This tool uses Terser — the industry-standard JavaScript minifier trusted by Webpack, Vite, and major CDNs. It fully supports ES2020+ including async/await, optional chaining, nullish coalescing, classes, modules, and all modern JavaScript syntax.
- Dead code elimination – Removes unused functions and variables
- Advanced variable mangling – Shortens all identifiers safely
- Constant folding – Evaluates constant expressions at build time
- Multi-pass compression – Runs multiple optimization passes for maximum reduction
- Safe transformations only – Never breaks valid JavaScript code
Frequently Asked Questions
Is JavaScript minification safe for my code?
Yes, minification is safe — it only removes unnecessary characters without altering code logic. We use the Terser engine which is battle-tested and used in production by millions of projects. Always test before deploying.
How much file size reduction can I expect?
Typical savings range from 30% to 60%. Well-commented, formatted code sees higher compression. Combined with gzip on your server, total savings can reach 70–80%.
Can I debug minified code?
Debugging minified code directly is difficult. For production workflows, generate source maps alongside minified files using a build tool like Webpack or Vite. Source maps let browsers show original code in DevTools.
Should I minify code during development?
No. Keep unminified code during development for easy debugging. Only minify when building for production. Build tools like Webpack, Vite, Rollup, and Parcel automate this as part of your pipeline.
Is my code secure when using this tool?
Completely secure. All minification happens locally in your browser using WebAssembly/JavaScript. Your code is never sent to any server. You can use this tool offline after the first page load.