Draw your signature by hand with a mouse, finger, or stylus, or type your name and have it rendered in a cursive font if you'd rather not draw it freehand. Either way the result exports as a PNG with a transparent background, so you can drop it straight onto a document, letterhead, or contract without a white box showing around it.
An image of a signature can be legally valid for many everyday documents, but binding e-signature laws (like the U.S. ESIGN Act) generally also care about consent, identity verification, and audit trails — things a simple drawing tool doesn't provide. For contracts where enforceability matters, use a dedicated e-signature service; for informal use (forms, personal documents, mockups) this works fine.
PNG supports an alpha channel, so only the ink strokes (or typed cursive text) are opaque pixels — everything else is transparent. That lets you layer the signature onto any colored page or document background without a visible rectangle around it.
Yes — the drawing canvas responds to mouse, trackpad, touch, and stylus input equally, though a stylus or touchscreen generally produces a more natural-looking result than a mouse or trackpad.