CSS → React Native StyleSheet
Convert CSS class rules into React Native StyleSheet.create() objects. Handles shorthand expansion, property mapping, and flags unsupported properties.
const styles = StyleSheet.create({
container: {
flexDirection: 'column',
alignItems: 'center',
justifyContent: 'space-between',
paddingTop: 16,
paddingRight: 24,
paddingBottom: 16,
paddingLeft: 24,
marginTop: 8,
marginRight: 8,
marginBottom: 8,
marginLeft: 8,
backgroundColor: '#f5f5f5',
borderRadius: 8,
width: '100%',
maxWidth: 400,
},
text: {
fontSize: 16,
fontWeight: '600',
color: '#333333',
lineHeight: 24,
letterSpacing: 0.5,
textAlign: 'center',
},
button: {
backgroundColor: '#007AFF',
borderRadius: 12,
paddingTop: 12,
paddingRight: 20,
paddingBottom: 12,
paddingLeft: 20,
opacity: 1,
overflow: 'hidden',
},
});21
Properties converted
0
Warnings
3
Classes processed
Convert CSS to React Native StyleSheet: instant, free, browser-only
Porting a web component to React Native is tedious. CSS properties map to React Native style props with different names, px values become unitless numbers, shorthands must be expanded, and a whole category of properties: box-shadow, transitions, gradients: simply don't exist. This tool automates all of that in one paste.
Paste any CSS ruleset and you get a ready-to-use StyleSheet.create() object back. The converter expands shorthands following CSS box-model rules, strips px units, maps kebab-case property names to camelCase, and separates warnings for unsupported properties so you know exactly what needs manual attention.
How to use: step by step
- 1Paste your CSS
Copy CSS rules from your web project, design system, or stylesheet and paste them into the input panel. - 2Review the converted output
The tool instantly generates a StyleSheet.create() object with all properties mapped to their React Native equivalents. - 3Check warnings
Any unsupported properties (box-shadow, transition, grid, etc.) appear in the warnings panel with guidance on alternatives. - 4Copy or download
Hit Copy to grab the output to your clipboard, or Download .ts to save the file directly. - 5Drop into your component
Paste the StyleSheet into your React Native component file and import StyleSheet from 'react-native' at the top.
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Frequently Asked Questions
- What CSS properties does the converter support?
- The tool supports all common layout and visual properties: flexbox (flexDirection, justifyContent, alignItems, flexWrap, gap), spacing (padding, margin with shorthand expansion), sizing (width, height, min/max variants), typography (fontSize, fontWeight, fontFamily, lineHeight, letterSpacing, textAlign), colors (color, backgroundColor), borders (borderRadius, borderWidth, borderColor, borderStyle), position (absolute/relative, top/right/bottom/left), overflow, opacity, zIndex, and image properties like resizeMode.
- What happens to unsupported properties?
- Properties that have no React Native equivalent: like box-shadow, transition, animation, CSS transforms, gradients, and pseudo-selectors: appear in a dedicated warnings panel. Each warning includes a brief explanation and suggests the appropriate React Native alternative (e.g., use the RN Shadow Generator for shadows, Animated API for transitions).
- How does shorthand expansion work?
- CSS shorthand properties like padding: 16px 24px or margin: 8px are automatically expanded into individual React Native properties (paddingTop, paddingRight, paddingBottom, paddingLeft). The tool handles all 1-value, 2-value, 3-value, and 4-value shorthand forms following the standard CSS box model rules.
- Does it handle border-radius shorthand?
- Yes. A single border-radius value is converted to borderRadius, while multi-value shorthands (e.g. border-radius: 8px 16px) are expanded into borderTopLeftRadius, borderTopRightRadius, borderBottomRightRadius, and borderBottomLeftRadius.
- Are pixel values converted to numbers?
- Yes. React Native style values are unitless numbers, not pixel strings. The converter strips 'px' from values and converts them to plain numbers (e.g., padding: 16px becomes paddingTop: 16). Percentage values (e.g., width: 50%) are kept as strings since React Native supports percentage strings for certain layout properties.
- Does React Native support display: flex by default?
- Yes. All React Native Views use Flexbox by default: display: flex is the implicit layout model, so the converter simply omits it from output. display: none is preserved (it hides a component), while display: grid is flagged as unsupported with a suggestion to use flexbox instead.
- Can I convert multiple CSS classes at once?
- Yes. The tool processes all CSS classes in the input at once and outputs a single StyleSheet.create() object containing all of them as named keys. Each class becomes a separate property in the StyleSheet, ready to reference as styles.container, styles.text, etc.
- What should I do about box-shadow warnings?
- React Native doesn't support CSS box-shadow. For iOS, use the dedicated shadow properties: shadowColor, shadowOffset, shadowOpacity, and shadowRadius. For Android, use elevation. The RN Shadow Generator tool on AlteredIdea lets you configure both visually and copy the correct code.
- Does this tool work with Expo projects?
- Yes. The generated StyleSheet.create() code is compatible with both bare React Native and Expo projects. The output uses only the core react-native StyleSheet API with no third-party dependencies.
- Is my CSS data sent to any server?
- No. All conversion happens entirely in your browser using JavaScript. Nothing is uploaded or stored: your CSS stays on your machine.
AlteredIdea vs alternatives
vs writing conversions manually: Saves hours of repetitive typing. Paste CSS, get idiomatic StyleSheet code instantly.
vs IDE plugins: No install, no configuration, works across any IDE or OS.
vs AI assistants: Purpose-built for this one task. Consistent output, no prompting needed.