How Client-Side CSS and JavaScript Minification Works
CSS & JS Quick Minifier runs entirely in your browser with JavaScript. There is no sign-up, and whatever you type or open here is processed on your device instead of being sent to a server.
Shrink Code File Size Directly in Your Browser Memory
Minify stylesheets and frontend scripts without sending proprietary code to external third-party servers. Strips redundant whitespace, line breaks, indentation, and comments in browser memory to reduce file payloads and boost webpage load times.
Safe Syntax Preservation for Semicolons and Operators
Minifying code requires strict token parsing to prevent syntax corruption. The JavaScript minifier copies strings, template literals and regular expressions untouched, keeps the spaces that separate keywords such as return and let, and keeps a line break wherever automatic semicolon insertion could depend on it; test the minified code before you deploy it.
Instant Before-and-After Compression Metrics
Inspect exact byte savings and percentage reduction immediately after minification. Copy the minified code to your clipboard with one click.
Why processing in your browser matters
Many online tools upload your files or text to a server to process them. This one does the work on your computer or phone, so your data is not sent to us or stored anywhere else. That lowers the risk when you work with confidential material, although you should still follow your organisation's own rules. Read how this works in our Privacy Policy.
- No uploads: files are opened and saved on your device, so there is no upload or download wait.
- No account: nothing to sign up for or install.
- Free to use: no subscriptions or paywalls.