Remove whitespace, comments and redundant code from HTML, CSS and JavaScript to shrink file sizes and speed up load times.
HTML Minifier strips whitespace, comments and redundant characters from HTML, CSS and JavaScript, reducing file sizes without changing how the code behaves. Smaller files mean faster page loads, lower bandwidth costs and better Core Web Vitals scores. Everything runs locally in your browser, so your code is never uploaded to any server.
Minification is a safe, lossless optimisation: it removes only the characters a browser ignores — indentation, line breaks and comments — so the output behaves exactly like the original source. It is not the same as obfuscation or compression: your variable names and structure are untouched, and the file is still valid HTML, CSS or JavaScript, just smaller. Keep your readable source in version control and minify as a build step or before deploying, so the browser downloads the compact version while you keep working with the full one.
Reviewed by the ToolBrainy Team · Runs entirely in your browser · Last updated July 2026
Select HTML, CSS or JavaScript from the tabs above.
Paste the source code you want to minify into the input box.
Copy the minified output or download it as a file.
Minification runs locally. Your code is never sent to a server.
Strips HTML, CSS and JS comments that add no runtime value.
Smaller files download faster and improve Core Web Vitals.
No signup, no limits and no watermarks, ever.
Shrink page templates before deploying to production.
Reduce stylesheet size to speed up rendering.
Strip comments and whitespace from inline JavaScript.
Minify HTML email code to stay within size limits.
Smaller assets improve page speed scores for better rankings.
Serve less data to users on slow or metered connections.
Yes. This tool is completely free with no signup, no limits and no watermarks.
Minification removes whitespace and comments only, so the code behaves identically. It does not rename variables or alter logic, so nothing should break.
Switch between the HTML, CSS and JS tabs. If your file mixes languages, paste each section separately and combine the outputs.
Yes. All minification runs entirely in your browser. Your code is never sent to or stored on any server.
The tool automatically sets the correct extension based on the selected language: .html for HTML, .css for CSS and .js for JavaScript.
It depends on how much whitespace and how many comments the source contains. Heavily commented or deeply indented code can shrink by 20–50%; already-compact code saves less. Combined with gzip or Brotli on your server, minification gives the biggest wins on large HTML templates and CSS files.
Both help and they stack. Minify first to remove characters the browser does not need, then let your server apply gzip or Brotli on top. Minified-then-compressed files are smaller than compressing the unminified source alone.
No. The HTML Minifier runs entirely in your web browser, so there is nothing to download or install — just paste your code and copy the result.