Minify CSS and JavaScript online
Paste code or choose one CSS/JS file to minify in your browser. Compare its size before and after, then copy or download the result to test in your project.
Paste code or choose a file to minify
How to minify CSS or JavaScript
Choose a tab or file
Choose the CSS or JavaScript tab and paste code, or select one .css/.js file up to 5 MB to open its matching tab.
Minify and compare sizes
Click Minify CSS or Minify JavaScript. Compare the before and after sizes; already compact code may not get smaller.
Check, then copy or download
Keep the original and test the resulting styles or scripts before using them. Then copy or download the .min.css/.min.js file.
Check the code after minifying
This tool removes comments and whitespace using simple rules. It does not validate syntax or guarantee unchanged CSS or JavaScript behavior. Keep the original and test the resulting styles or scripts before using them on a website.
If the result is not as expected
Size did not decrease
Compare the before and after sizes. Compact code may have little whitespace to remove. Use the original if the result is larger.
Styles or scripts behave differently
Return to the original. For complex syntax, use a parser-based minifier in your build process and rerun your tests.
File cannot be opened
Choose one .css or .js file up to 5 MB at a time. For larger files, use your project build tool.
Where is the code processed?
Minification reads your code or file in the browser and creates the download there. This tool does not upload the code to KitoTool for minification.
HTML Minifier
Minify HTML from pasted code or a file, compare byte sizes, and review the result before downloading.
JSON Formatter
Format, validate and minify JSON in your browser. Review syntax errors and copy the result.
Color Palette
Build a five-color palette from one color, check contrast and export CSS, JSON, SVG or PNG.
Link Shortener
Create short HTTP or HTTPS links with an optional alias or password.
Password Checker
Check a password against simple rules and generate a random password in your browser.
Website Technology Checker
Inspect public signals from one HTML page to identify CMS, frameworks, server/CDN and theme, with evidence and inferred backend language.
Online Markdown Editor
Write and edit Markdown online with real-time preview, file and workspace management, autosave, Markdown to HTML conversion and flexible export.
Base64 Encoder Decoder
Encode or decode UTF-8 text and supported images with Base64, then copy or download the result.
Comments & feedback
Loading ratings…
Write a commentNo account needed