CSS Minifier
Compress pasted CSS snippets or local .css files directly in your browser. Your stylesheet is not uploaded, logged, or sent to an API.
Click to choose a CSS file or drop it here
You can also paste CSS directly into the editor below.
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Conservative CSSO settings
The default run removes comments and whitespace but keeps structural optimizations disabled to avoid risky stylesheet rewrites.
Snippet and file input
Paste partial CSS, full stylesheets, media queries, custom properties, or load a local .css file.
Safe measurement
Analytics use only size and reduction buckets. CSS source, URLs, selectors, comments, and filenames stay out of telemetry.
Frequently asked questions
Is my CSS uploaded to Convertr?
No. The minifier runs locally with browser JavaScript. Pasted CSS and selected files are not sent to Convertr servers.
Why disable structural optimization by default?
Some aggressive CSS rewrites can change cascade behavior. The first version keeps compression conservative and focused on safe minification.
What happens when CSS has a syntax error?
The parser error is shown in the warnings panel so you can fix the stylesheet before copying output.