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Signature Resizer

Clean up a photo of your signature, make the background white and resize it for online forms.

  1. Choose file
  2. Choose option
  3. Download

Choose a photo of your signature

JPG, PNG, WEBP or iPhone HEIC · up to 25 MB

Processed in your browser — never uploaded

How it works

  1. Step 1

    Photograph your signature

    Take a photo with your phone, or choose one you already have.

  2. Step 2

    Clean up and size it

    Adjust the cleanup, pick a size and the KB range your form asks for, like 10–50 KB.

  3. Step 3

    Download

    Get a crisp signature on a pure white background.

How to photograph your signature

  • Sign on plain white paper with a dark blue or black pen.
  • Use daylight or a bright room, and keep your phone’s shadow off the paper.
  • Hold the phone flat and straight above the paper.
  • Fill most of the photo with the signature — but leave a little space around it.
  • Check your form’s required size, KB limit and ink colour before you download.

Questions

Is my signature uploaded anywhere?

No. Your photo is cleaned up and resized by your own browser. It never leaves your phone or computer, and we cannot see it.

What does "Cleanup strength" do?

It decides how much of the background turns pure white. Raise it to remove shadows and paper texture; lower it if light parts of your pen strokes are disappearing.

Can I keep my blue ink?

Yes — your pen colour is kept by default (made slightly darker so it prints clearly). If a form asks for black ink, turn off "Keep original ink colour".

My form says the signature must be between 10 KB and 50 KB. How do I do that?

Under "File size your form asks for", type 10 and 50, or tap the 10–50 KB button. It works with a preset size and with your own size. The tool finds the best quality inside that range, shows the final KB size, and tells you if the range is not possible at that size.

Why is there white space around my signature?

The signature is trimmed to the ink, then placed in the exact size you chose without stretching it. If its shape is different from that size, the extra area is filled with white.

Can I take the photo with my phone camera?

Yes. On a phone, tap "Take a photo" to use the camera directly. Sign on plain white paper with a dark pen for the best result.

Send feedback

Found a problem or missing a size? Tell us — we read every message.

What is it about?

Only if you'd like a reply. We never use it for anything else.