Pixels vs kilobytes: what resize image to 20KB means
Forms often mix two different measures:
| Measure | What it describes | Example rule |
|---|---|---|
| Dimensions | Width and height of the picture | Width 200 to 300 pixels |
| File size | How much data the file uses | Maximum 20 KB |
They are linked. Fewer pixels means less to store, so a smaller file. Halving the width and height leaves a quarter of the pixels, and the file drops sharply. That is why a 20 KB result from a big phone photo is almost always a lot narrower than the original.
This page works toward the KB limit and picks the dimensions for you. If the form also names exact pixels, set those first with Resize Image, then run the 20 KB step here. At a few hundred pixels wide, quality alone is usually enough, so your dimensions stay as you set them.
Sizing a passport style photo or a signature
Exam, recruitment, admission and government forms commonly ask for a small photo and a separate signature image, each with limits near 20 KB. Rules differ, so copy the exact numbers from your portal.
- Passport style photo: it is usually taller than wide. Crop it with Crop Image using 4:5, or type the exact pixel box from the form. Keep the face filling most of the frame on a plain light wall.
- Signature: a signature image is usually a wide strip, much wider than tall. Sign in dark ink on white paper, crop close to the ink with Free, and leave a thin margin.
- Format: keep JPG output unless the form asks for something else.
After downloading, open the file once. Check that nothing was cut off and that the dimensions match the form. Interested in the quality side of the same limit? See Compress Image to 20 KB.