clean-css
CSS minifier for reducing file size and improving load times.
Pricing
Free tier
Flat rate
Adoption
↘CoolingLicense
Open Source
Data freshness
Verified · Jul 12, 2026Overview
What is clean-css?
Clean-CSS is a CSS minifier that reduces the size of your CSS files by removing unnecessary characters, whitespace, and comments. This tool helps in optimizing web performance by decreasing load time.
Key differentiator
“Clean-CSS stands out as a highly configurable and widely used tool for CSS minification, offering both command-line and programmatic integration options.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
Some complex CSS features might not be optimized fully, leading to suboptimal performance.
Setting up multiple optimization levels and conditions via CLI requires detailed command-line arguments which can be error-prone.
Processing extremely large CSS files can lead to increased CPU usage and longer processing times, impacting build performance.
Fit analysis
Who is it for?
✓ Best for
Developers who need to optimize the performance of their web projects by reducing CSS file sizes.
Teams that use automated build processes and require a reliable, configurable minifier.
✕ Not a fit for
Projects where manual optimization is preferred over automatic minification tools.
Scenarios requiring real-time or on-the-fly CSS processing without pre-minification.
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Integrations
Next step
Get Started with clean-css
Step-by-step setup guide with code examples and common gotchas.