Signature generator

Transparency is the whole point. A signature saved on a white background sits on the page as a visible white rectangle wherever the document is not also white, and on a coloured letterhead or a scanned form it looks obviously pasted. A transparent PNG has no background at all, so only the ink lands.

The strokes are recorded as points and redrawn rather than painted directly onto the canvas. That is what allows undo, and it means the colour and pen width can be changed after you have signed rather than forcing you to start again. The canvas is also sized to your screen’s pixel ratio, because a signature drawn at one pixel per point and then scaled up for print is visibly soft — which rather defeats the purpose on a document someone will look at closely.

Worth being clear about what this is and is not. It produces an image of your signature. That is what most people mean and what most forms accept, and it carries roughly the weight of a signature on a fax. It is not a digital signature in the cryptographic sense — that is a different thing entirely, binds a document to a certificate, and detects any later alteration. If a contract requires a qualified electronic signature, an image will not satisfy it.

One practical caution: an image of your signature is reusable by anyone who has the file. Treat it like a physical stamp — do not email it around, and prefer to place it in the document and send the flattened result.