Wikimedia Commons has media related toImages with inappropriate JPEG compression.

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These images were uploaded in theJPEG format even though they contain non-photographic information. It is suggested that the original sources be revisited and that aPNG orSVG file without compression artifacts be uploaded in their places. For more information, seeWikipedia:Preparing images for upload.Images can be added to this category by placing the{{Bad JPEG}} template on the image description page. Computer and video game screenshots should be tagged with{{Should be PNG}}.Note: If the image is copyrighted, it should not be rendered any larger than is required for the purposes of identification and/or critical commentary.

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• Images with inappropriate compression