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How to reduce image size for a website in photoshop
Create a copy of your original image file and file your original somewhere safe.
You'll be working from the copy in order to protect your data.
Decide how large you'd like your image to appear on the screen.
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.