"Image dimensions: This is the width and height of the image in pixels - basically how big it looks on your screen. File size: This is how much space the image takes up on the internet, measured in KB or MB. Bigger images usually mean bigger file sizes, but file size also depends on the type of file and how it's saved."
"Say your website shows an image at 800×600 pixels, but you upload a massive 4000×3000 pixel photo. Your browser still has to download that huge photo, even though it only needs to show a smaller version. That's like carrying a suitcase twice as big as you need - unnecessary and slow. By resizing your images to the exact size they'll appear on your site, you reduce the amount of data visitors have to download. This means pages load faster."
Browsers must download every image on a webpage before the page fully renders, and large image files increase load times and cause slow, frustrating experiences. Image dimensions (pixel width and height) determine display size, while file size (KB or MB) determines download weight; file size also depends on file format and how the image is saved. Uploading oversized photos forces browsers to download unnecessary data. Resizing images to the actual display dimensions and optimizing formats reduces transmitted data, accelerates rendering, and improves user engagement. These savings are especially important for mobile users on limited data or slower networks.
Read at SitePoint Forums | Web Development & Design Community
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