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Ideal picture dimensions for websites
Pixel width: In most situations, 2500 pixels is ideal for displaying content in full screen mode on a browser. If an image is smaller than that, it may be cropped or appear pixelated when it tries to fill the browser width.
Image size: The ideal total (pixel) size for your photographs will depend on how they will be used; for example, background images should be larger than images for blog posts.
File size: Anything larger than 20 megabytes will have a significant influence on the speed of your website. Generally speaking, smaller photos (up to 1 megabytes) work better.
Image attribute: Image attributes, sometimes known as alt text or alt tags, are text-based and have little effect on how well your website functions. But keep in mind that screen-reader software is used by the blind to use them.