What is HTML / CSS / JS Minifier?
Minification removes everything a browser does not strictly need — comments, extra spaces, line breaks and indentation — from your source code. A minifier shrinks HTML, CSS and JavaScript files so pages load faster and use less bandwidth, without changing how the code behaves.
This tool minifies each language appropriately and instantly shows you how many characters, and what percentage of the file size, you saved.
How to Use the HTML / CSS / JS Minifier
- Choose whether you are minifying CSS, JavaScript or HTML.
- Paste your code into the input box.
- Click Minify to compress it.
- Review the size saved, then copy the minified output.
Features of Our HTML / CSS / JS Minifier
- Minifies CSS, JavaScript and HTML
- Removes comments and unnecessary whitespace
- Shows before, after and percentage saved
- Handles each language with tailored rules
- Copy-ready output
- Runs entirely offline
Benefits & Use Cases
Web developers reduce page weight to improve load times and Lighthouse scores, which benefits both user experience and SEO. Smaller files also mean lower hosting bandwidth costs.
Because minification happens in your browser, you can process proprietary code without uploading it to an external service.
The HTML / CSS / JS Minifier is completely free, needs no sign-up or installation, and runs entirely in your browser — nothing you enter is uploaded to a server, so your data stays private. It works on desktop, tablet and mobile, in light or dark mode.
Tips & Best Practices
Minifying strips comments, whitespace and line breaks so pages download faster and score better on performance audits — the tool reports the exact byte saving. Always keep your original, readable source for editing and deploy only the minified copy; and because this is a lightweight minifier, test minified JavaScript before shipping anything critical.
Validate or pretty-print JSON first with the JSON Formatter, and generate the page's meta tags once the markup is final.
FAQ about HTML / CSS / JS Minifier
Does minifying change how my code works?
For well-formed CSS and HTML, no. This is a lightweight minifier, so for complex JavaScript always test the output, as aggressive whitespace removal can occasionally affect edge cases.
How much smaller will my file be?
It varies with how much whitespace and how many comments your code contains, but savings of 20 to 60 percent are common.
Should I keep an unminified copy?
Yes. Always keep your original, readable source for editing, and deploy the minified version to production.
Is my code uploaded?
No. All minification runs locally in your browser, so your source code never leaves your device.