Frontend tools
Trim CSS output before it goes into production
Use the minifier when you need lighter stylesheets, quick size checks, and a straightforward way to copy or download the result.
On this page
Tool
CSS Minifier
Add your input, check the result, then copy or download what you need.
Minified CSS will appear here...
Minification
Remove comments, whitespace, and unnecessary characters to reduce file size.
Auto-Prefixer
Automatically add vendor prefixes for better cross-browser compatibility.
Download
Download the minified CSS as a .min.css file ready for production use.
Use cases
When this is useful
A few common cases.
Prepping a stylesheet for deployment
Paste a block of CSS, compress it, and download a smaller version without opening another local tool or build step.
Comparing output quickly
The side-by-side preview makes it easier to inspect how much noise was removed before you move the code back into a project.
Light compatibility cleanup
Toggle vendor prefixes when you need a quick pass for older syntax coverage without a larger pipeline.
Why it helps
What it helps with
The parts that matter.
Focused on the core job
Paste CSS, minify it, check the savings, and grab the output without extra noise around the task.
Readable at a glance
Statistics, copy, and download actions stay close to the minified output so the workflow is easy to scan.
Useful in handoff moments
It works well when you need a quick minify pass for demos, snippets, or fixes outside the main build pipeline.
FAQ
A few things worth knowing
Short answers before you start.
What does this minifier remove?
It strips comments, trims unnecessary whitespace, tightens declarations, and removes redundant semicolons before closing braces.
What is the auto-prefixer toggle for?
It adds a small set of vendor-prefixed properties before minification so you can generate a more compatibility-friendly output quickly.
Can I keep the minified file?
Yes. The tool keeps copy and download actions in place so you can grab the result as text or as a ready-to-save CSS file.
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Support Konverter
If a tool saved you time, you can support the project.
If you want to help me keep working on Konverter, fixing rough edges, and adding more useful tools, this is the easiest way.
Want the longer version, other ways to help, or a better picture of what the support goes toward? Visit the support page.