What size should a handwritten signature be?
The right size is set by the space it fills, not by a fixed measurement.

A signature does not have one correct size; it has a correct size relative to the line it sits on. Sized to fill roughly a third to half the width of a standard signature line, it reads as confident without crowding the printed name below it.
Getting the mark off the paper
Write on unlined white paper with a dark pen, photograph it straight down in daylight, and let the background be as bright as possible. What size should a handwritten signature be? start here: everything the software can do later depends on this one clean capture.
On a phone or tablet screen, the same signature often needs to look slightly larger relative to the surrounding text than it would on paper, simply because on-screen elements read smaller at arm’s length.
Placing it on the document
The finished signature should be a transparent image, cropped close, sized to the signature line rather than to the page. A white rectangle around it is the single most common giveaway that a signature was pasted in.
The one size to avoid is one that changes the export. Resize the image itself, not just its display — a signature stretched wider or taller than its original proportions looks visibly distorted once printed.
What makes it hold up
What usually matters in a dispute is not the beauty of the mark but the trail around it: who sent the file, when it was signed, from which address. The drawn signature is the visible part of a much longer record.
You can build any of these in the browser: open the Signature maker, draw or type your name, and place the result straight onto a PDF or Word file. Nothing is uploaded — the document never leaves your device.