Online Code Minifier - JS & CSS Compression Tool

Code minification is the process of removing unnecessary characters from source code — such as whitespace, comments, line breaks, and block delimiters — without changing its functionality. The goal is to reduce file size, which leads to faster page loads and reduced bandwidth consumption. For JavaScript and CSS files, minification can typically reduce file size by 20–60%.

Minifying JS and CSS directly improves your website's performance. Smaller files download faster, which means quicker page rendering, better Core Web Vitals scores, and improved SEO rankings. It also reduces server bandwidth costs and provides a smoother experience for users on slower connections or mobile devices. Major websites like Google, Amazon, and Facebook all serve minified assets in production.

Minification removes whitespace, comments, and redundant syntax while preserving the original logic and variable names. Obfuscation goes further — it renames variables to short, meaningless labels (e.g., myVariableName → a) and may restructure code to make it harder to read and reverse-engineer. Our tool focuses on safe minification; it won't rename your variables or alter your code's behavior in any way.

Yes, absolutely. Proper minification preserves the semantics and behavior of your code. Our tool carefully handles strings, regular expressions, and CSS content properties to ensure nothing is broken. However, we always recommend testing your minified output before deploying to production — especially if your code contains complex regex patterns or template literals.

Typical savings range from 20% to 50%, depending on how heavily commented and formatted your source code is. Code with extensive comments, large indentation, and verbose formatting can see savings of 50% or more. Already-compact code may only shrink by 5–15%. Our tool shows you the exact byte savings and compression ratio after each minification.

Yes! Enable the "Preserve /*! */ comments" option. Comments that start with /*! (or //! in JavaScript) are typically license or copyright headers that should be retained in distributed code. Our tool respects this convention and will keep those comments intact while stripping all others.

Yes, our tool is fully responsive. On smartphones and tablets, the input and output panels stack vertically for easy scrolling. All buttons, options, and statistics remain accessible, and the text areas are optimized for touch interaction. You can minify code on the go — no desktop required.

No. All minification happens directly in your browser using client-side JavaScript. Your code never leaves your device — there is zero server-side processing, no uploads, and no data collection. This also means the tool works offline once the page is loaded.

Beyond removing comments and whitespace, our CSS minifier can: compress hex colors (#aabbcc → #abc), remove unnecessary units from zero values (0px → 0), strip trailing semicolons, and eliminate redundant whitespace around selectors, properties, and values. Each optimization is optional and can be toggled on or off.

Absolutely. Simply paste the contents of your <script> or <style> block into the input area (without the HTML tags), and the tool will minify it. For inline scripts in HTML, extract the JavaScript or CSS first, minify it, then place it back into your HTML document. Some build tools automate this process for you.