Free Online HTML, CSS & JavaScript Minifier
Minify HTML, CSS, and JavaScript to reduce file size
How to Use HTML/CSS/JS Minifier
- 1
Select language
Choose HTML, CSS, or JavaScript from the language selector.
- 2
Paste your code
Enter or paste the code you want to minify.
- 3
Copy minified output
The minified version appears instantly. Click copy to use it.
Frequently Asked Questions
Is my data safe?
Will minification break my code?
How much smaller will my files be?
Does it support TypeScript or SCSS?
Is this the same as compression?
Learn more
About HTML/CSS/JS Minifier
Minify HTML, CSS, and JavaScript code to reduce file size and improve page load speed. Removes whitespace, comments, and unnecessary characters while preserving functionality. Essential for web performance optimization. All processing happens locally in your browser — your source code is never uploaded to any server. No sign-up required.
Why Use HTML/CSS/JS Minifier?
- Reduce file sizes by 20-60% by removing whitespace, comments, and redundant characters.
- Improve page load speed — smaller files download faster, especially on mobile networks.
- Client-side processing — your source code stays on your device, unlike server-based minifiers.
- Supports HTML, CSS, and JavaScript in one tool — no need to switch between different minifiers.
- Instant results — paste code and get the minified version in milliseconds.
Common Use Cases
Production deployment
Minify assets before deploying to production when you do not have a build tool configured.
Email templates
Minify inline HTML and CSS in email templates to stay under email client size limits.
Embedded widgets
Minify JavaScript and CSS for embeddable widgets or third-party scripts to minimize impact on host pages.
Quick optimization
Rapidly minify a single file without setting up a full build pipeline like Webpack or Vite.
Tips & Best Practices
- 💡Always test minified code before deploying — minification can occasionally break code that relies on variable names or comment-based logic.
- 💡For JavaScript, consider using a proper bundler (Webpack, Vite, esbuild) for production builds — they offer tree-shaking and other optimizations beyond minification.
- 💡Minify CSS after removing unused styles for maximum size reduction.
- 💡Keep unminified source files in version control — never commit only minified code.
How It Works
The minifier uses lightweight regex-based transformations for HTML and CSS (removing comments, collapsing whitespace, removing optional closing tags). For JavaScript, it removes comments and unnecessary whitespace while preserving string literals and regex patterns. This approach is fast and handles most common cases, though it does not perform advanced optimizations like variable renaming or dead code elimination that tools like Terser or esbuild provide.