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The signature box. Government and examination portals ask for a scanned signature at 10–20 KB more often than they ask for anything else this small. This page opens the image compressor with the ceiling already set to 20 KB, so the only thing left to do is drop the picture in. The quality is searched rather than guessed at, and the resolution comes down only once quality on its own cannot reach the number. A signature or a small monochrome mark gets there cleanly. A face photograph at 20 KB is possible and will look like it — if the form allows 50 KB for the photo and 20 KB for the signature, which most do, use each ceiling for the thing it was meant for.
This runs in your browser. The file is not uploaded, there is no account to create, and nothing is added to the document you download.
Also searched for: compress image to 20kb, reduce photo size to 20kb, compress jpg to 20kb, make image less than 20 KB. It is the same tool whichever way you found it.
Comfortably. A signature is a few dark strokes on white, which is the easiest thing there is to compress — most come out well under the ceiling with the strokes still crisp. Scan or photograph it against plain white paper rather than a patterned surface; the background texture is what costs the kilobytes, not the signature.
Then you are told so rather than handed a file that misses the mark quietly. The smallest version the ladder reached is offered instead, with its real size next to it, and you are never given something larger than what you put in — if nothing beats your original, you get your original back.
It is handed straight back, untouched. The ceiling is the whole requirement and it is already met, so re-encoding it would only spend quality to make a file that was already acceptable slightly smaller.
Only the file, until it has to change the picture. JPEG quality comes down first, which throws away detail the eye is worst at noticing; the pixel dimensions only shrink once quality alone cannot reach the number, and the notes say when that happened and what the image ended up as.
No. The file is opened, changed and written by this browser tab — it is never sent to a server, so there is no queue to wait in and nothing to delete afterwards. Once the page has loaded you can turn the network off and the tool still works.