Signature resizer
clean and form-ready

How to resize a signature for a form

1. Sign on plain white paper with a dark pen, and take a close, straight photo in good light.
2. Set the size, ink color and background in the settings panel.
3. Choose the photo or drop it on the page. It’s cleaned up right away.
4. Check the result and press Save or Download. Changed a setting? Press Apply to all files.

Taking a good signature photo

• Use plain white paper without lines, and a black or dark blue pen. Gel and felt-tip pens give darker strokes than ballpoints.
• Sign a little larger than usual; the tool will scale it down.
• Photograph from directly above, in daylight or bright room light, and keep your phone’s shadow off the paper.
• Fill most of the frame with the signature, but leave a little paper around it.

What the tool does to your photo

• It works out how bright the paper is across the photo, so shadows and uneven light disappear.
• It separates the ink from the paper and removes small specks and dust.
• It crops tightly around the ink, leaving a small margin.
• It recolors the ink and fits the signature into the size you chose, centered and without stretching.

What the settings do

• Ink colour: Black, Blue, or As in the photo.
• Background: White (JPG) for most forms, or Transparent (PNG) to place the signature on documents.
• Size: 140 × 60 px, 300 × 100 px, 600 × 200 px, or Original size (cleaned, max 2400 px). Some application forms ask for small sizes like 140 × 60 px; check what yours says.
• Clean-up strength: 10 to 90%, 50% by default. Higher removes more shadows and paper texture; lower keeps faint, thin strokes.
• File size limit: No limit, or under 20, 50, 100 or 200 KB.

Common problems and fixes

• “We couldn’t find a signature”: take a closer photo of dark ink on plain light paper.
• Lines from ruled paper or shadows are left: raise Clean-up strength, or sign again on blank paper.
• Thin strokes are broken or missing: lower Clean-up strength and use a darker pen.
• There’s a stray mark beside the signature, or it looks too small: other dark things in the photo, like a pen or the table edge, count as ink. Crop the photo to just the signature with Crop image first.
• The transparent PNG is over the size limit: choose White (JPG) or a smaller size.

Privacy

Your signature is cleaned and resized in your browser. It isn’t uploaded or stored, which is how it should be for something that can authorize payments and contracts.