A signature upload often needs a wide, short image. The safest preparation keeps the entire mark inside that box rather than stretching it until every side touches the edge.
Signature Image Preparation fits the whole source to the entered width and height. It can optionally make near white source pixels transparent using a chosen RGB cutoff.
Fit the mark before removing its background
For a 400 by 300 source fitted into 600 by 200, the image content becomes approximately 267 by 200 and is centred horizontally. The output canvas remains 600 by 200.
If most of the source is empty paper, crop around the signature first. Otherwise, the tool preserves that empty region too, and the actual mark can look unnecessarily small in the box.
The default background treatment keeps the paper. The optional near white rule makes pixels transparent when all three RGB channels meet the selected threshold.
A threshold can remove more than paper
A cutoff of 240 can remove pale areas, including faint pen strokes or highlights in the writing. It is a colour test, not an AI model that recognises a signature separately from its background.
Inspect the lightest parts of the mark against both light and dark backgrounds. The checker preview helps show alpha but does not prove that every required stroke survived.
PNG keeps transparent pixels. Some portals require JPEG or a solid white background instead, so follow the actual upload rules rather than assuming transparency is preferred.
This tool does not verify a signature or prove identity. Use a source you are authorised to prepare, keep an original and review the generated dimensions and bytes before submitting it to an application form.