Paste your JavaScript
Minified Output
Minified JavaScript appears here…
What This Tool Does
The JavaScript Minifier strips whitespace, removes comments, and collapses unnecessary characters from your JavaScript files, reducing their size so they load faster in the browser. It shows you the original vs minified file size and percentage saved so you can see the impact immediately.
Only whitespace and comments are removed — no variable renaming or logic restructuring, so the output is always functionally identical to the input.
How to Use
1. Paste your JavaScript into the input box or click Sample.
2. Click Minify to remove whitespace and comments.
3. Check the size stats to see how much was saved.
4. Click Copy Output to copy the minified code.
Frequently Asked Questions
Why would I want to minify my JavaScript?
Minification reduces file size by removing whitespace, comments, and unnecessary characters — typically saving 20–60%. Smaller files download faster, which speeds up page load times and improves Core Web Vitals scores. It is standard practice before deploying JavaScript to production, and most build tools like Webpack, Vite, and Rollup do it automatically. This tool is useful when you need a quick minification without setting up a build pipeline.
Will minification break my code?
This tool only removes whitespace and comments — it does not rename variables or restructure logic, so it will not break correctly written code. Always test minified output before deploying to production.
Is my code sent to a server?
No. Minification runs entirely in your browser. Your code never leaves your device.
What is the difference between minification and obfuscation?
Minification removes whitespace and comments to reduce file size while keeping code readable. Obfuscation additionally renames variables and restructures code to make it harder to read — at the cost of debuggability.