A common constraint for online forms – limiting photo uploads to under 20 KB – can be surprisingly difficult to meet due to how JPEG compression works. Simply reducing the quality setting doesn't always suffice because a photo's size is primarily determined by its pixel count, and even low-quality images with millions of pixels can exceed the limit. This highlights a misunderstanding of image compression for those unfamiliar with the underlying mechanics, and emphasizes the importance of resizing images to the required pixel dimensions before adjusting quality. A new tool has been developed to automate this process, searching for the optimal combination of pixel size and quality to meet the target file size.
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