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In the image below, you can see three different versions of an image file: the original JPEG file, an edited PSD version, and a final JPEG version that's been resized and saved for the Web. Save for Web also includes several helpful features for preparing images for the Web, including the option to resize images. This tool allows you to save images that are optimized for the Web, which will make them easier to download and view online.
Save for Web: If you're planning to upload an image to the Web, like on a blog or website, you'll want to use the Save for Web feature. However, unlike PSD files these formats aren't as useful if you plan to continue editing the file, and they also can't preserve layer information. These file formats can be viewed and edited on almost any computer or mobile device, which makes them well-suited for sharing with others. Common file formats: You can save images in a variety of common file types, including JPEG and PNG. PSD files are designed to be opened in Photoshop, so if you want to share the image with others you'll also need to save a copy of the image in a common file format, like JPEG. It will save your layers and all of the other information in your image so you can easily re-edit it later. PSD: This is the default file type for Photoshop documents, although you won't necessarily use it for every image.
When saving a file in Photoshop, you have several options and file formats to choose from: