Free HTML, CSS and JavaScript Minifier

Minify or beautify your code in one click. HTML, CSS and JS in the same place. Paste, pick a mode, click, copy. Free, no sign-up, runs entirely in your browser.

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Free HTML, CSS and JavaScript minifier

A code minifier strips comments, whitespace and unnecessary characters from your code to make it as small as possible. A code beautifier does the opposite, reformatting compressed code with consistent indentation and line breaks so a human can read it. This free tool from The Digital Maze does both, for HTML, CSS and JavaScript, all in one place.

Everything runs in your browser. Your code is never sent to a server, never logged, never tracked. Paste, click, copy.

Why minify code?

Faster page loads

Smaller files transfer faster, especially on mobile networks. Minifying HTML, CSS and JavaScript typically cuts file size by 20% to 60% with no functional change.

Better Core Web Vitals

Page speed is a Google ranking signal. Smaller files reduce Largest Contentful Paint (LCP), free up the main thread for interactivity, and improve overall site performance scores.

Lower bandwidth costs

For high-traffic sites, the bandwidth savings from minified assets add up to real money over a year. Every byte not shipped is a byte not paid for.

Cleaner production code

Comments and developer notes do not belong on a live site. Minification removes them automatically so internal docs stay internal.

Minify vs beautify vs uglify

The three terms get used interchangeably but mean slightly different things:

Minify. Remove comments, whitespace, line breaks and trailing semicolons. The file still works exactly the same, it just gets smaller.
Beautify. The reverse. Take minified code and reformat it with proper indentation and line breaks so it is human-readable again.
Uglify. A more aggressive version of minify that also renames variables, removes dead code and applies safe rewrites. Usually only done for production JavaScript, using tools like Terser or esbuild.

Code minification best practices

Keep your source files readable. Minify on deploy, not in your editor. You want comments and indentation while you are working.
Automate it. Run minification as part of your build pipeline (Webpack, Vite, esbuild) so nobody forgets.
Use source maps. Source maps let you debug minified code in production by pointing back at the original source. Worth the small extra build step.
Enable Gzip or Brotli compression. Server-side compression is a separate layer on top of minification and gives another 60% to 70% reduction. Use both.
Minify HTML carefully. Aggressive HTML minification can break sites that rely on whitespace (rare but possible). Test on staging first.
Do not minify by hand. Use a tool. Saves time and removes the risk of breaking syntax.

About this tool

This tool handles the core minification and beautification jobs for HTML minification, CSS minification and JavaScript minification. It is intentionally conservative on the JavaScript side. We strip comments and collapse whitespace, but we do not rename variables, dead-code eliminate, or do aggressive AST-level rewrites. For that, use Terser or esbuild as part of your build pipeline.

For HTML and CSS, the output is production-ready and ready to drop into your live site.

Need help with site performance?

Minified files are one piece of a bigger performance picture. If your site is slow, our technical SEO team can audit Core Web Vitals, identify rendering bottlenecks and rebuild slow templates. Our web development team can ship the fixes. Get in touch for a no-pressure conversation.