What Is the Ideal Size of an Image for HTML Pages?
The ideal image size for HTML pages varies based on a number of factors, including the upload speed of your Internet connection and download speeds of the Internet connections of visitors to your website, the size and quality of the original image, the intended use for the picture and the number of images per page.
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Connection Speeds
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Most Internet connections won't have a problem with uploading images, but dial-up, satellite, or other slow-upload connections may be unreasonably slow uploading images that are more than 100 kilobytes.
Original Image Size/Quality
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Even a 1- or 2-megapixel image is too large to fit on most computer monitors. Most pictures should be scaled down to a resolution of less than 640x480 pixels and less than 250 kilobytes.
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Intent of Use
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If the image needs to be very large, with its high detail playing a factor in how the site's visitors use it, its pixel count shouldn't be reduced as much. It may still need to be reduced slightly, but will probably end up with a resolution that falls between 640x480 and 1280x1024 pixels--most people won't have monitor resolutions higher than that. File sizes could reach as much as 1 megabyte.
Number of Images
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For a page with multiple images, such as a gallery, the best format is to show a thumbnail-sized image that links to a larger-sized image.
JPG
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For HTML pages, images should always be converted to .jpg extensions because .jpg files offer the highest file size compression of all image formats. The exception to this rule is when the image will be used for printing or detailed viewing on larger monitors because converting a file to .jpg permanently reduces image quality.
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