PDFConvertersOnline.comHow to get an image under 20 KB
- Add the picture the form wants, for example a signature scan or a head-and-shoulders photo.
- 20 KB is already filled in under Target size. Change it only if your form names a different number.
- Press Compress and upload the file whose size shows below 20 KB.
Where a 20 KB limit shows up
Twenty kilobytes is one of the tightest caps you are likely to meet. It is common on online application systems that were built years ago and store many thousands of attachments: exam registrations, government service portals, scholarship and recruitment sites. These forms often ask for two small files, a passport-style photo and a scan of your signature, and each one may have its own maximum. Always read the instructions on the form itself; this page cannot know the exact rules of any particular portal.
What fits in 20 KB
At this size the pixel count matters more than anything else. A modern phone photo has about 12 million pixels; a 20 KB JPG realistically holds somewhere in the range of 60,000 to 150,000 pixels at a readable quality, depending on how busy the picture is. As a rough guide:
| Content | Size that usually lands under 20 KB |
|---|---|
| Face photo on a plain background | about 300×400 px or smaller |
| Signature in black ink on white paper | about 500×200 px, often much less than 20 KB |
| Busy outdoor scene | about 250×250 px |
You don't need to work this out yourself. The tool first tries quality levels from high to low, and when that is not enough it shrinks the picture step by step. The result line tells you the final width and height so you can check them against the form.
If the form also asks for exact dimensions
Some portals specify pixel dimensions as well as a size limit. In that case, set the dimensions first with Resize Image, then come back here. Starting from the right dimensions lets the tool spend the whole 20 KB on quality instead of scaling the picture down on its own. To trim empty paper around a signature or crop a face tighter, use Crop Image before compressing; less empty space means more bytes for the parts that count.
Keeping a signature readable
- Scan or photograph the signature in good light, on plain white paper, with a dark pen.
- Crop tightly around the ink so the file isn't spending bytes on blank paper.
- If the lines look fuzzy or blotchy after compressing, it usually means the image was scaled down too far. Crop tighter and try again rather than accepting a blurry signature.
More ways to use this tool
Frequently asked questions
Why does my result say 19.5 KB and not exactly 20?
The tool aims just below the limit so the file is accepted whether the website counts a kilobyte as 1,000 or 1,024 bytes.
My photo became small. Is that normal?
Yes. Almost no camera photo fits in 20 KB at full size, so the picture is scaled down until it fits. The new dimensions are shown next to the file.
Can I use PNG for a 20 KB signature?
You can. A PNG is reduced to fewer colors, which suits black ink on white paper very well. Many forms ask for JPG though, so check what yours accepts.
The form says 10–20 KB. What should I enter?
Keep 20. If a result comes out below 10 KB, raise the target a little or start from a larger, sharper scan.
Are my ID photo and signature uploaded to your server?
No. Everything runs in your browser and the files stay on your device.
Why does the quality look so low?
Twenty kilobytes is very little space. Cropping away background and starting from a sharp, well-lit picture help more than anything else.