Where 20 KB limits come from
Online recruitment and exam forms often ask for a scanned signature in a tight range. For example, MSTC’s upload instructions ask for a signature of about 140 × 60 pixels, as a JPG, between 10 KB and 20 KB, and a photo of 20 KB to 50 KB (source, checked October 29, 2026). Always use the numbers in your own form’s instructions.
Getting a clean signature under 20 KB
- Sign with a dark pen on plain white paper, then scan it or photograph it in good light.
- Crop tightly around the signature. Empty paper wastes bytes.
- If the form gives pixel sizes, set them under “Resize” first (for example 140 × 60), then compress. See resize image for exact sizes.
- Save as JPEG. PNG scans are usually far too big for a 20 KB limit.
Need a different limit? Try 50 KB,100 KB or any size.
Frequently asked questions
How do I reduce a signature to 20 KB?
Add the scan or photo of your signature and press Compress. The tool keeps the best JPEG quality that fits under 20 KB. Crop away the empty paper first so the ink keeps more detail.
What if the form says between 10 KB and 20 KB?
The tool aims just under 20 KB and warns you if a file comes out under 10 KB. If that happens, use a larger or sharper scan rather than a tiny one.
Can a photo of my face fit in 20 KB?
Yes, if it’s small: around 200 × 230 pixels, the size many forms ask for, a face photo fits in 20 KB. A full-size phone photo has to be shrunk a lot first, which the tool does for you.
Is 20 KB 20,000 or 20,480 bytes?
Forms differ. This tool counts 1 KB as 1,000 bytes, so files stay under 20,000 bytes and pass either way.
Are my photos uploaded?
No. Your photos stay on your phone or computer and are never sent to us or anyone else, because the work happens right on your device. That matters for signatures, which you shouldn’t hand to random websites.
