This article explains how to download photos from the web to your iPad using Safari or one of the many apps that support the feature. This article includes information about taking screenshots of photos in apps that don't support the feature.
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The iPad makes it easy to download photos and images from the web to your iPad. When you find an image that you want to save to your iPad, follow these instructions:
Find the photo you want to save. You can save from the Mail app, Safari browser, Facebook, or another app. Place your finger on the photo and hold it until a menu appears on the screen. Tap Save Photo (or Save Image or Add to Photos, depending on the app) to download it.
In some apps, you need to tap the photo to view it in full screen before you can download it.