Signing without printing, signing and scanning
The print-sign-scan cycle is one of the more absurd routines in modern office life. A perfectly good digital document is turned into paper, marked, photographed, and turned back into a worse digital document — larger, skewed, no longer searchable, and often barely legible.
Adding a signature directly to the PDF skips all of it. The document stays clean, the text stays selectable, the file stays small, and the result looks deliberate rather than like something rescued from a fax machine.
It also removes the equipment problem. Signing digitally needs nothing beyond the device you already have, which matters when the request arrives while you are away from a printer and the deadline is today.
Drawn signatures versus digital signatures
These are frequently confused and they are not the same thing. What this tool produces is an electronic signature: an image of your signature placed on the page, which is what the overwhelming majority of agreements actually require and accept.
A digital signature in the cryptographic sense is a different mechanism. It binds a certificate to the document, proves mathematically that the file has not been altered since signing, and identifies the signer through a certificate authority. It is what you need for certain regulated filings and formal legal instruments, and it requires a certificate you have obtained in advance.
For everyday use — contracts, consent forms, letters, delivery notes, school paperwork — an electronic signature is legally effective in most jurisdictions, including under the ESIGN Act in the United States, eIDAS in the European Union and the Information Technology Act in India. Where a specific form of signature is mandated, the requirement will normally say so explicitly.
Placing a signature so it looks right
Size it against the surrounding text rather than the page. A signature two or three times the height of the body text reads naturally; one that spans a third of the page looks like a graphic somebody dropped in.
Sit it on the signature line rather than above or through it, and align it left with the line's start. Small misalignments are surprisingly noticeable, and a signature floating in white space is the clearest sign that a document was signed by pasting an image.
Sign with a transparent background if you can. A signature on a white rectangle looks fine on a white page and obviously wrong on anything tinted or textured, and the white box tends to appear exactly when the document is reused somewhere you did not anticipate. Fill in any accompanying date and name fields too — an unsigned date line beside a signature invites questions.
Keeping a signature image you can reuse safely
Once you have a signature you are happy with, it is worth keeping it rather than redrawing it each time — partly for consistency, since a signature that looks different on every document invites questions, and partly because drawing a good one with a trackpad takes several attempts.
Treat the file with some care, though. A clean image of your signature on a transparent background is genuinely useful to anyone who obtains it, and it is the sort of thing that ends up in a cloud-synced folder without much thought. Keeping it somewhere deliberate, rather than in Downloads, is a reasonable precaution.
For documents that matter, consider adding the date in your own hand alongside the signature rather than as typed text. It is a small thing, but a signature and date that visibly come from the same pen read as more considered than a signature image dropped beside a typed date.