[header] How to reduce image size for a website in photoshop [title] Create a copy of your original image file and file your original somewhere safe. [step] You'll be working from the copy in order to protect your data. [title] Decide how large you'd like your image to appear on the screen. 
[step] Typical websites are roughly 800 pixels wide, but different display settings and sizes can have a large impact on your images' appearances. For instance, if you are using a 1024x768 pixels setting, an 800-pixel wide image will stretch across roughly 80% of the computer screen.