How to use Signature Image Cleaner
- Upload a clear image of dark strokes on a light background.
- Choose a threshold, output background and crop setting.
- Create the PNG, inspect fine strokes and keep the original for comparison.
Example: Signature Image Cleaner
A local worked example using the inputs and settings below for signature image cleaner.
Options
- Threshold
- Only sufficiently dark decoded pixels with supported alpha survive. Retained pixels become opaque black, which can remove colored ink and soft edges.
- Crop and padding
- Cropping uses the kept-pixel extent, then adds bounded padding. An empty kept area is refused rather than downloaded as a blank signature.
Supported inputs and limits
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
Inspect every stroke before using the copy
A light stroke can disappear and a dark background mark can remain. Try a different threshold on a copy and compare the full signature against the source. This pixel operation neither verifies a signer nor creates evidence of authorization.
Questions about Signature Image Cleaner
What threshold should I choose?
Compare a few nearby values. A higher threshold keeps more light pixels, which can also retain page shadows. Check narrow strokes before using the copy.
Will this remove every kind of background?
No. It separates pixels by brightness, so patterned paper or a dark background may not separate cleanly from the signature.
Does cleaning verify a signature?
No. The output changes an image and makes no claim about who signed it or whether it is authentic.