Minify Code
Minify HTML, CSS and JavaScript.
What does minifying code mean?
Minifying means stripping source code of everything the browser doesn't need to run it: whitespace, line breaks, comments and redundant characters. The code behaves exactly the same, but the file is smaller and the page loads faster. Docuboxer's minifier processes HTML, CSS and JavaScript directly in your browser, without sending your code to any server — the work happens in your device's memory using the same engines professional build pipelines rely on (Terser for JavaScript, html-minifier for HTML). That matters when you handle proprietary or client code, because it never leaves your machine, and the tool keeps working offline once the page has loaded. Typical results are a 20% to 60% reduction from the original size, shown before and after so you can see the exact savings, ready to copy and deploy to production. Free, no signup.
How to use Minify Code
- Paste your HTML, CSS or JavaScript into the minifier's input panel.
- Select the language (JavaScript, CSS, HTML or JSON) and tune the options: remove comments, collapse whitespace, or mangle local variable names in JavaScript.
- Get the minified code instantly, check how much smaller it is, and copy it to the clipboard for production.
Common use cases
Optimize frontend assets for production
Minify HTML, CSS and JavaScript before deploying your site to cut file sizes, reduce load time and improve your Google PageSpeed and Core Web Vitals scores.
Cut bandwidth consumption
Squeeze the unnecessary whitespace out of your application's code — fewer bytes transferred means lower hosting costs and a better experience on slow connections.
Snippets for CMS and third-party pages
Minify the CSS or JavaScript you paste into WordPress, Shopify, a tag manager or a landing page editor, where every injected kilobyte counts and one compact block is easier to manage.
HTML emails and templates
Reduce the weight of HTML email templates before loading them into your marketing platform — some mail clients clip messages over a certain size, and minifying keeps you under the limit.
Minify proprietary code without risk
Client and internal code never has to touch a third-party server: everything is processed locally in your browser, and no copy remains anywhere.
Frequently asked questions
How do I minify JavaScript, CSS or HTML online?
Paste the code into the input panel, pick the language, and the tool produces the minified version instantly. Everything happens in your browser: nothing to install, no signup, no files uploaded to a server.
Can minification break my JavaScript?
Removing whitespace, line breaks and comments never affects functionality. The variable-renaming option (mangle) only touches local variables and is safe for normal code — but turn it off if your code relies on reflection or dynamic property names. Always test the output before deploying.
How much smaller does minified code get?
It depends on how many comments, spaces and indentation the original carries — 20% to 60% is typical. The tool shows the size before and after so you can see the exact savings for your file.
What's the difference between minifying and gzip compression?
They are complementary. Minifying removes unnecessary characters from the source; gzip or Brotli compress the file during HTTP transfer and the browser decompresses it on arrival. A minified file served with gzip is the optimal combination — minification still saves bytes even after compression.
Should I keep an unminified copy of my code?
Yes — always keep the original source for development and debugging, and use the minified version exclusively in production. Having both makes troubleshooting painless when an issue comes up.
Can I minify PHP with this?
Minifying PHP doesn't pay off the same way: PHP runs on the server and users never download that code, so shrinking it doesn't speed up page loads. What does help is minifying the HTML, CSS and JavaScript your PHP outputs to the browser — exactly what this tool does.
Is it safe to paste proprietary or client code here?
Yes. Unlike online minifiers that process your code on their servers, Docuboxer minifies locally in your browser. Your code is never transmitted over the internet, and closing the tab leaves no trace.