Responsive fontSize based on screen-size of the device in React-Native.

Use this library if you have a small problem with the font size ?

How to install

yarn add react-native-responsive-fontsize
# or
npm install react-native-responsive-fontsize --save

How it looks on different device sizes

iPhone SE iPhone X


arguments Description
RFPercentage percent: number The font size is calculated as a percentage of the height(width in landscape mode) of the device.
RFValue value: number, standardScreenHeight?: number The font size is calculated based on standardScreenHeight and passed value
  • when using RFValue's standardScreenHeight
    • default standardScreenHeight is 680
    • In landscape mode, please pass the screen width


import { RFPercentage, RFValue } from "react-native-responsive-fontsize";

const styles = StyleSheet.create({
  welcome: {
    fontSize: RFValue(24, 580) // second argument is standardScreenHeight(optional),
    textAlign: "center",
    margin: 10,
  instructions: {
    textAlign: "center",
    color: "#333333",
    marginBottom: 5,
    fontSize: RFPercentage(5),