Photo Size Reducer

Signature Size Reducer

Use this signature size reducer after the checklist below, to shrink a scanned signature to the limit your form asks for.

Drop a photo here or tap to choose

JPG, PNG or WebP. Stays on your device.

A signature is the easiest thing to compress well, as long as the file starts out clean. Go through this list before you press Compress and most problems disappear.

Whether your goal is to reduce signature size, compress signature image files for a portal, or stay near a signature 20KB limit, the scanned signature size depends on how clean the original is.

Before you scan

  • Use plain white paper with no lines, and a pen with dark ink. Blue or black both work. Pencil looks weak once compressed.
  • Sign larger than you normally would. A big, bold signature survives compression far better than a small, thin one.
  • Keep the paper flat and well lit, without a shadow across it.

After you scan or photograph

  • Crop tightly. Leave only a thin white border around the ink. Empty paper is wasted data.
  • Straighten the image if the paper is tilted. A level signature looks tidier on the form.
  • Do not add filters. Sharpening and heavy contrast create noise, and noise makes files bigger.

Compress it

  • Drop the picture into the box above and set the target. Many forms ask for 20 KB, but check yours. Some ask for 10 KB or 50 KB.
  • Press Compress and look at the preview. Zoom in on the thinnest strokes. If they are still visible and joined up, you are done.
  • If the tool says it could not reach the target, crop again, or use a darker scan.

Check before you upload

  • Read the size rule for your form. Some portals have a minimum as well as a maximum, so a very tiny file might be turned down.
  • Check any pixel rule, such as a required width and height. This page controls kilobytes, not pixel dimensions.
  • Check the file type. The result here is always a JPG.
  • Aim a little under the limit, for instance 19 KB for a 20 KB rule, because some sites count in slightly different units.

What not to do

  • Do not photograph your signature on a patterned table. The pattern becomes part of the picture.
  • Do not use a screenshot of a signature app. Those often carry extra pixels you do not need.
  • Do not upload a photo of the whole page. Crop it.

If your rule is different from 20 KB, the size pages below help: 10 KB, 30 KB and 50 KB. Your image is processed on your own device and does not get uploaded anywhere.