Resize and clean up a signature

Choose a photo of your signature on white paper to keep only the ink, at the pixels and KB a form needs.

What this tool does

Sign on plain white paper, take a photo, and this tool removes the paper and the shadows and keeps only your ink. Save it on a white background as a JPG for upload forms, or see-through as a PNG for signing documents. Type the exact pixels and the KB size a form asks for, and the file is made to match.

How it works

  1. Sign on plain white paper with a dark pen and take a photo of it.
  2. Adjust until only your ink is left, clean and dark.
  3. Download it with a see-through or white background, at the exact pixels and KB size a form asks for if needed.

Questions and answers

See-through or white background?

See-through (PNG) is best for signing documents. Many upload forms want a white JPG with a size limit, so choose that for forms.

Can I set an exact size like 140 × 60 pixels?

Yes. Open "Does a form need an exact size?" and type the width and height the form gives.

How do I resize a signature to a KB size such as 20 KB?

In the same box, fill in the smallest and largest file size the form allows. The signature is saved as a white JPG inside that range.

The form gives the size in cm. What do I type?

The size boxes take pixels. To turn centimetres into pixels, multiply by the DPI and divide by 2.54. For example, 6 cm at 200 DPI is about 472 pixels.

Is my signature uploaded?

No. It stays on your device.

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