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20 KB is a small file. It is enough for a signature or a small face photo, but a full-size camera photo has to give up pixels, quality, or both to fit. This page shows what that looks like, so you can choose before you resize.
No upload. No watermark. No sign-up. Every tool mentioned here runs inside your browser.
We ran the live tool on three test pictures with a 20 KB limit. A grainy 2400 × 1600 photo, which is the hardest kind for a JPG, came out at 840 × 560 pixels and 63% quality, at 19,504 bytes. A smoother 2400 × 1600 photo came out at 1682 × 1121 pixels and 56% quality, at 19,996 bytes. A signature on white paper, 900 × 300 pixels, kept all its pixels at 81% quality, at 19,818 bytes.
The test pictures were made by a script, not taken with a camera, so treat the numbers as a guide. A real photo with a plain background usually lands between the grainy and the smooth case.
A signature is mostly white paper with a few dark strokes, and a JPG stores plain areas very cheaply. That is why the signature kept its full size at 20 KB while the photos did not.
To keep it small and sharp, sign with a dark pen on white paper, photograph or scan it straight on, and crop away the empty space before you resize. Every extra pixel of blank paper still costs a little.
If the form gives a width and a height, choose Exact size and type them. With the pixel size fixed, the tool only has to find a quality. In an earlier test, a 2400 × 1600 photo made 200 × 230 pixels came to 9,103 bytes at 95% quality, well under 20 KB, because a small picture needs few bytes.
If the form gives only a size in KB, choose Keep the size. The tool lowers the quality first and shrinks the picture only if it has to, and the result card tells you the new width and height.
Exact size crops the edges from the centre to fill the frame. Frame your face in the middle of the photo before you resize, or the crop can cut off part of it.
In Exact size mode the pixels are fixed, so a large width and height may not fit however low the quality goes. The tool then says so and gives the smallest size it could reach, and it saves no file. Ask for fewer pixels or raise the limit.
In the other modes the tool reduces the pixels until the picture fits. Check the width and height on the result card, because a very small limit can leave a very small picture.
Some websites count 1 KB as 1000 bytes and some as 1024 bytes. This tool counts 1 KB as 1000, so the file is under 20 KB by both rules. The result card shows the exact number of bytes, and the file will be a little under the limit, not exactly at it.
The picture is drawn again inside this browser tab. It is not uploaded, and the hidden camera information of the original, which can include where a photo was taken, is not in the new file.
Open Resize Image to KB, drop in the picture, type 20 as the biggest size and press Resize. If the form states a width and height, choose Exact size and type them first.
Fitting a camera photo into 20 KB takes lower quality or fewer pixels. Start from the original file, not a copy that a chat app already compressed, and crop the picture closer to your face before you resize.
It will be under 20 KB, not exactly 20 KB. The tool finds the highest quality that fits, and the result card shows the exact bytes.
Usually yes. In our test a 900 × 300 pixel signature kept every pixel at 81% quality. Sign on white paper with a dark pen and crop the empty space.
Only if the quality alone gets the file under 20 KB. Otherwise the tool shrinks the picture, and the card shows the new size next to the old one. In Exact size mode you choose the width and height.
A JPG. A JPG is far smaller than a PNG for a photo, and see-through areas of the PNG become white.
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