The height, width, and quality options can be adjusted to control the size and quality of the screenshot.

ScreenshotExample expo react native

import React from 'react';
import { View, Button, Alert } from 'react-native';
import { takeSnapshotAsync } from 'expo';

class ScreenshotExample extends React.Component {
  takeScreenshot = async () => {
    try {
      const result = await takeSnapshotAsync(this.view, {
        result: 'file',
        height: 500,
        width: 300,
        quality: 0.5
      });
      Alert.alert('Screenshot saved to', result);
    } catch (error) {
      Alert.alert('Oops, something went wrong!', error.message);
    }
  };

  render() {
    return (
      <View ref={view => (this.view = view)}>
        <Button onPress={this.takeScreenshot} title="Take Screenshot" />
      </View>
    );
  }
}