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--- title: react-native-view-shot description: A library that allows you to capture a React Native view and save it as an image. sourceCodeUrl: https://github.com/gre/react-native-view-shot packageName: react-native-view-shot platforms: ["android", "ios"] inExpoGo: true --- Given a view, `captureRef` will essentially screenshot that view and return an image for you. This is very useful for things like signature pads, where the user draws something, and then you want to save an image from it. If you're interested in taking snapshots from the GLView, we recommend you use [GLView's takeSnapshotAsync](gl-view.md#takesnapshotasyncoptions) instead. ## Installation ## Note on pixel values Remember to take the device `PixelRatio` into account. When you work with pixel values in a UI, most of the time those units are "logical pixels" or "device-independent pixels". With images like PNG files, you often work with "physical pixels". You can get the `PixelRatio` of the device using the React Native API: `PixelRatio.get()` For example, to save a 'FullHD' picture of `1080x1080`, you would do something like this: ```js const targetPixelCount = 1080; // If you want full HD pictures const pixelRatio = PixelRatio.get(); // The pixel ratio of the device // pixels * pixelRatio = targetPixelCount, so pixels = targetPixelCount / pixelRatio const pixels = targetPixelCount / pixelRatio; const result = await captureRef(this.imageContainer, { result: 'tmpfile', height: pixels, width: pixels, quality: 1, format: 'png', }); ``` ## Learn more