How to convert CSS to a React style object
Three steps, no sign-up, and the CSS never leaves your machine.
1
Paste your CSS
Drop in loose declarations like color: red; or entire rulesets with selectors, comments and media queries. You can also drag a .css file straight onto the editor.
2
Choose a format
Switch between a React style object, a React Native StyleSheet.create call, typed TypeScript, plain JSON, or a ready-to-paste inline style attribute for JSX.
3
Check and copy
Read any warnings about properties that will not survive the jump, then copy the object to your clipboard or download it as a file for your project.
What actually changes between CSS and React
A style object is JavaScript, not CSS, so a handful of things have to be rewritten rather than copied. These are the conversions the tool applies for you.
When style objects are the right call
Inline style objects are perfect for values that change at runtime and awkward for everything a stylesheet does well. Use them deliberately.
Good fit
- Values driven by props or state — a progress width, a chart colour, a computed offset.
- React Native and Expo, where
StyleSheet objects are the only styling model.
- Porting a design from a static mock-up or a Figma CSS export into components.
- One-off styles on a single element that never need to be reused or themed.
- Email templates and generated HTML where inline styles are mandatory.
Poor fit
:hover, :focus and ::before — inline styles cannot express them at all.@media and @supports — you need a stylesheet, a CSS-in-JS library, or a resize hook.- Shared design tokens — CSS custom properties in a stylesheet cascade far better.
- Large static styles on hot-rendering lists, where a new object every render adds pressure.
- Keyframe animations, which have to live in real CSS.
Frequently asked questions
Everything people usually ask about converting CSS into React style objects.
Is my CSS uploaded to a server?
No. The entire conversion runs in your browser with JavaScript. Nothing is sent anywhere, so proprietary stylesheets stay private — you can load the page once, go offline, and it still works.
Why does React need camelCase style properties?
A React style object is a plain JavaScript object, and a hyphen is not valid in an unquoted JavaScript key — background-color would parse as a subtraction. React therefore expects backgroundColor. CSS custom properties such as --brand-color are the one exception: they keep their exact name and are emitted as quoted keys.
Can I paste a full stylesheet with selectors?
Yes. Every ruleset becomes its own named object, with the key derived from the selector — .btn-primary becomes btnPrimary, #site-header becomes siteHeader. Comments, at-rules and rules nested inside @media are parsed properly instead of corrupting the output. Tick Merge all rules into one object if you would rather flatten everything into a single style.
How is the React Native output different?
React Native uses unitless numbers, so 16px becomes 16. Shorthands are expanded because React Native rejects multi-value margin or padding; box-shadow becomes shadowColor, shadowOffset, shadowRadius and shadowOpacity plus an Android elevation; and transform becomes an array of single-key objects. Anything React Native does not support is listed in the warnings panel rather than silently emitted.
What happens to !important?
It is stripped, and the tool tells you where. Inline styles already beat stylesheet rules on specificity, and the browser ignores !important inside a style object, so carrying it across would do nothing.
Do pseudo-classes and media queries convert?
They are kept as separate named objects so no work is lost, but React inline styles cannot apply :hover, ::before or @media by themselves. Apply those objects conditionally from state, or hand them to a CSS-in-JS library or a plain stylesheet.
Should numeric values be numbers or strings?
On the web either works — React appends px automatically to a unitless number on properties that take a length, and leaves genuinely unitless ones such as lineHeight, zIndex, opacity and flexGrow alone. Strings are the safer default because they preserve your units exactly, so the tool keeps them unless you tick Unitless values as numbers. React Native requires real numbers, so that output always converts them.
Does it handle vendor prefixes?
Yes. A prefixed property becomes a capitalised camelCase key, which is what React expects: -webkit-box-orient becomes WebkitBoxOrient and -moz-appearance becomes MozAppearance. The -ms- prefix is the odd one out — React wants a lowercase ms, so -ms-flex-align becomes msFlexAlign.
Can I convert React styles back to CSS?
Not with this tool — it runs one way. Going back is mostly mechanical though: un-camelCase each key into a hyphenated property and add px to bare numbers on length properties.
Is the CSS to React converter free?
Yes. Completely free, no sign-up, and no limit on how much CSS you convert.
