In the process of frontend development and site maintenance, two tasks come up regularly: minifying CSS to speed up page loading and testing regular expressions before putting them into production code.
CSS minification
CSS Minifier compresses code by removing extra whitespace, line breaks and comments — without changing any styles. The file after minification can shrink by 20–40% of its original size, directly improving page load speed. Just paste your code or upload a file and download the minified version.
Regular expression testing
Regex Tester shows matches in real time: enter a regular expression and a test string — the service highlights all matches and shows capture groups. This saves you from creating temporary HTML pages with console.log every time you need to verify an expression.
Why this is better than the browser console
Unlike the developer console, Regex Tester shows all matches at once rather than one at a time, and lets you visually confirm that the expression doesn't capture too much. CSS Minifier gives you exact byte savings — right down to the compression percentage.
Both tools work locally in your browser, no code is sent to a server — your source files never leave your device.