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What image size should you choose for a website?
Quick answer
For a website, choose a width that matches the real display size: often 1200 to 1600 px for a large content image, less for a thumbnail.
Explanation
The right size depends on the display area. A banner or main content image can often be 1200 to 1600 px wide. A thumbnail can be much smaller. The goal is to avoid serving an image that is much larger than what users actually see.
Concrete example
If your article displays images at 900 px wide, a 1200 px image is usually enough. A 4000 px wide photo will slow the page down without providing much visible benefit.
Common mistake
Do not keep the original dimensions of a smartphone photo if the image is intended for a small web area. It is often wasted file weight.
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