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Online JavaScript Minifier
Optimize your JavaScript code with our JS minifier
Shrink your JavaScript with our free online JS Minifier. It strips out comments, whitespace, and unnecessary characters to cut file size and speed up page loads, all while keeping your script's behavior intact — ideal for trimming production bundles before you deploy.
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Could not minify. Check your JavaScript for syntax errors.
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Efficient JavaScript compression
Our JavaScript Minifier compresses JS files by removing unnecessary characters, spaces, and comments. This process significantly reduces the file size, ensuring that your JavaScript remains functional while loading faster, improving overall website performance.
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Cross-device compatibility
Whether you’re working on a desktop, tablet, or smartphone, our JavaScript Minifier is fully responsive and accessible from any device. You can optimize your JS files on the go, ensuring that your website performs well across all platforms.
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Secure and private processing
Your privacy is our priority. The JavaScript Minifier processes your code directly in your browser, meaning your JS files are not stored on any servers. This ensures that your work remains confidential and secure throughout the minification process.
How to use the JavaScript minifier
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Paste or Upload Your JavaScript Code: Enter your JS code directly into the minifier's text area or upload your JavaScript file.
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Click 'Minify': The tool automatically compresses your JavaScript code by removing unnecessary characters and spaces.
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Copy or Download the Minified JS: Once the process is complete, download the minified JavaScript file or copy the compressed code directly.
Supported file types
Open a JavaScript file from your computer, drag one in, or paste your code. The minifier accepts:
.jsJavaScript source files
.mjsES module JavaScript
.cjsCommonJS JavaScript
Everything is processed right in your browser, so your JavaScript never leaves your device. You can also paste code directly instead of opening a file, then download the result as a .min.js file.
Shrinking a different kind of file? Static.app minifies these too:
How Static.app's JavaScript minifier compares
Every tool here shrinks JavaScript well, so the honest split is about power versus convenience: Terser and UglifyJS engines squeeze the hardest and expose the most knobs, while Static.app keeps a fast in-browser workflow and is the only one that also publishes your file as a live hosted website.
| Static.app | Terser REPL (try.terser.org) | Toptal JS Minifier | JSCompress.com | CodeBeautify JS Minifier | |
|---|---|---|---|---|---|
| Runs in your browserStatic.app minifies fully client-side, so your code never leaves the page. | Yes (nothing uploaded) | Yes (in-browser) | No (server-side API) | No (server-side) | Yes (in-browser) |
| Minify engineTerser and UglifyJS are the reference engines; JSCompress runs Terser, so it can edge out our defaults on some files. | UglifyJS (compress + mangle) | Terser (ES6+, strongest) | Not disclosed (API) | Terser (ES2026) | Not disclosed |
| Paste, open file, drag-drop | All three | Paste only | Paste only | Paste + file upload | Paste, upload, load URL |
| Copy and download result | Copy + download (.min.js) | Copy (playground) | Copy to clipboard | Copy output | Copy + download |
| Size-savings readoutStatic.app shows the exact bytes and percent saved after each run. | Original / minified / % saved | No | No | No (states up to 80%) | No |
| Beautify / un-minify | Yes (js-beautify) | No (minify focus) | No | No | Yes (separate beautifier) |
| Configurable optionsTerser's REPL is the clear winner for tuning compress, mangle and ECMA target. | No (one sensible default) | Full compress/mangle/ECMA | API params | Combine multiple files | Basic view options |
| Publish as a live hosted websiteOnly Static.app can turn the file into a hosted website; the others stop at giving you minified text. | Yes (custom domain, free SSL) | No | No | No | No |
| Best for | Minify, see savings, then host it | Tuning Terser settings | API / CI automation | Combining and shrinking bundles | All-in-one code toolbox |
If you need to fine-tune compression flags, the Terser REPL is the right home, and JSCompress is great for merging several files into one. Static.app aims at the common case: paste or drop your script, minify it with UglifyJS, see exactly how many bytes you saved, then publish it as a real hosted website on your own domain with free SSL, which the pure minifier pages do not offer.
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Frequently asked questions
What is a JavaScript minifier?
A JavaScript minifier is an online tool that reduces the size of JavaScript files by removing unnecessary characters, spaces, and comments. This process makes the JS code more efficient, improving website load times and performance.
Is the JavaScript minifier free to use?
Yes, our JavaScript minifier is completely free to use. You can access it from any device with an internet connection without any hidden costs or limitations.
Do I need to download or install anything to use the JavaScript minifier?
Our JavaScript minifier does not require downloads or installations. It is a fully online, browser-based tool, meaning you can start minifying your JS code immediately without setting up any software.
How do I minify JavaScript using the JavaScript minifier?
To minify JavaScript, paste your JS code into the minifier's text area or upload a JavaScript file. Click the "Minify" button, and the tool will compress your JS code by removing unnecessary elements. You can then copy the minified JS or download the file for immediate use.
What does minifying JavaScript mean?
Minifying JavaScript involves reducing the size of JS files by eliminating unnecessary characters, spaces, and comments. This optimization process decreases file size, leading to faster page load times and improved website performance.
Does the JavaScript minifier support modern JavaScript standards?
Yes, our JavaScript minifier supports all versions of JavaScript, including the latest ES6 and beyond. It ensures that your code is optimized while remaining compatible with current web development practices.
Can I use the JavaScript minifier on mobile devices?
Absolutely! Our JavaScript minifier is fully responsive and works seamlessly on desktops, tablets, and smartphones. You can optimize your JS code on the go without any issues.
What are the benefits of minifying JavaScript?
Minifying JavaScript offers several key benefits: * Faster Load Times: Smaller JS files load more quickly, improving user experience. * Improved SEO: Faster page loads can positively impact search engine rankings. * Reduced Bandwidth Usage: Smaller files use less bandwidth, which can lead to cost savings and better performance for users with slower internet connections.
What is the best free online JavaScript minifier, and how does Static.app compare to Terser or JSCompress?
There is no single best tool; it depends on your goal. The Terser REPL (try.terser.org) is best when you want to tune compression, mangling, and the ECMA target by hand, and JSCompress.com is handy for combining several files into one minified bundle. Static.app's minifier is best for a fast everyday workflow: it minifies your JavaScript in your browser with the UglifyJS engine (compress plus variable mangling), shows the exact bytes and percentage saved, and lets you copy or download the .min.js file. Unlike the pure minifier pages, Static.app can also publish that file as a live hosted website on your own custom domain with free SSL.
Does the JavaScript minifier run in my browser, or is my code uploaded to a server?
It runs entirely in your browser. Your JavaScript is minified locally with the UglifyJS engine and is never uploaded to or stored on our servers, so it stays private. This is different from some popular tools such as the Toptal JavaScript Minifier, which processes your code server-side through an API.
Can I publish my minified JavaScript file as a live website?
Yes. After you minify and download your JavaScript, you can host it on Static.app, which publishes it as a live website on a custom domain with free SSL and global CDN delivery. Most online minifiers only give you the minified text and stop there; Static.app takes the extra step of getting your file online.