Online HTML/CSS Minifier
This 100% free, private tool instantly minifies and compresses HTML and CSS code directly in your browser. By stripping unnecessary whitespace and comments offline, you can optimize your web projects for faster loading speeds without exposing your source code to external servers. To format or minify JSON payloads, try our JSON Formatter.
What is a Code Minifier?
A code minifier is an optimization tool that removes unnecessary characters—such as spaces, line breaks, tabs, and comments—from source code. It retains the exact functionality of the code but significantly reduces its file size for faster web delivery.
Example
Input (CSS):
body {
color: red; /* Make it red */
}
Output (Minified CSS):
body{color:red}
Advantages and Limitations
- Advantages: Reduces bandwidth usage, improves website load times (Core Web Vitals), and speeds up parsing by the browser. 100% client-side ensures total privacy.
- Limitations: Minified code is very difficult for humans to read or debug. Always keep an unminified version of your source code for active development.
How to Use
- Paste your raw HTML or CSS code into the input area.
- Select the appropriate language format (HTML or CSS).
- Click the "Minify Code" button to instantly compress your markup.
- Click "Copy Result" to save the minified, production-ready code to your clipboard.
Common Use Cases
- Web Optimization: Reducing HTML and CSS file sizes to improve Core Web Vitals and SEO rankings. You can also check your text's Keyword Density to further boost SEO.
- Production Deployment: Compressing code before uploading it to a live web server or CDN.
- Email Template Building: Minifying HTML to bypass size limits in email marketing platforms.
Privacy & Security
Your source code is completely safe. This tool uses local JavaScript regular expressions to minify code entirely within your browser. We never upload, save, or monitor the data you paste into the tool.
Frequently Asked Questions
What does minification do?
Minification removes unnecessary characters from source code—like spaces, tabs, line breaks, and comments—without changing how the code functions. This drastically reduces file size.
Is minification reversible?
While you cannot magically restore deleted comments, you can use a "formatter" or "beautifier" tool to re-add line breaks and indentation to make the code human-readable again.
Will this break my code?
This tool uses safe regex patterns to collapse whitespace and remove standard comments. However, it is always recommended to test the minified code in your environment before deploying to production.