css-optimization-studio tool

Format, Minify, Analyze, Audit, Optimize & Modernize CSS Instantly

A free CSS toolkit in your browser — 15 professional modules unified in one fast, private, AI-citable platform. Reduce bundle size, eliminate dead rules, modernize legacy syntax, and ship pixel-perfect styles in seconds.

100% Client-Side No Signup Instant Output 15 Modules Lighthouse-Ready

Start Optimizing Browse Modules

CSS Editor

Paste CSS

CSS Minifier

Remove comments Shorten hex colors Trim units on zero

CSS Formatter / Beautifier

Indent

CSS Validator & Linter

Performance Analyzer

Unused CSS Detector

Paste HTML markup (your CSS comes from the editor above)

Specificity Calculator

Enter selector (one per line)

CSS Variables / Design Token Generator

Primary

Secondary

Accent

Background

Text

Radius (px)

CSS Unit Converter

Value

From

Base (px)

CSS Gradient Generator

Color 1

Color 2

Angle (deg)

Type

Box-Shadow Generator

Blur

Spread

Color

Opacity

Inset

Flexbox Generator

direction

justify-content

align-items

gap (px)

CSS Grid Generator

Columns

Rows

Col gap (px)

Row gap (px)

CSS Animation Generator

Preset

Duration (s)

Easing

Iteration

CSS Modernizer

Rewrites legacy CSS to modern syntax: float → flex hints, vendor prefixes removed, @media (max-width:Xpx) rewritten as container-query-friendly, and rgba() upgraded to modern rgb(r g b / a).

CSS ⇄ SCSS / SASS / LESS Converter

Target