Signing Documents Online: What Is Actually Required

The two things called a signature

An electronic signature is an image of your signature placed on the page. Legally and practically it is the equivalent of signing with a pen and scanning the page. This is what people mean 95% of the time, and it is what almost every counterparty expects.

A digital signature is something else entirely: a cryptographic certificate bound to the file, which proves who signed it and makes any subsequent change to the document detectable. It requires a certificate issued by a recognised authority, usually at a cost, and it is needed only when someone specifically asks for one.

Which one you need

Almost always the first. Rental agreements, NDAs, offer letters, invoices, consent forms, supplier contracts, school forms — an electronic signature is standard practice and universally accepted.

• Electronic signature: everyday business and personal agreements. No cost, no certificate.
• Digital certificate: certain government filings, regulated finance and healthcare processes, EU qualified signature schemes — when the recipient names the requirement.
• Wet ink on paper: still required in some jurisdictions for wills, certain property deeds, and some court filings. Check locally rather than assuming.

Is it legally binding?

In most jurisdictions, yes. The EU's eIDAS regulation and the US ESIGN Act both give electronic signatures legal effect, and most other developed legal systems have equivalent provisions. What makes a signature binding is intent to be bound and consent to sign electronically, not the technology used to produce the mark.

The practical implication: what protects you is evidence of the process, not the pixels. Keep the email thread showing the document was sent, agreed and returned. That trail is what a dispute would actually turn on.

Why most electronic signatures look fake

It is the background, essentially always. Someone signs a piece of paper, photographs it, and drops the photo onto the document. The photo carries the paper's colour with it, so a faintly grey rectangle appears on the white page, with a visible edge. Everyone who sees it knows exactly what happened.

Draw the signature directly instead. A finger on a phone screen gives the most natural line, a trackpad is next, and a mouse is workable with a little practice. The result has a genuinely transparent background because it was never on paper.

Placing it properly

Size it against the surrounding text — roughly twice the height of the body text reads correctly. A signature spanning half the page looks like a mistake, and one the size of the body text looks timid.

Sit it on the signature line rather than floating above it. Add the date in the format the rest of the document uses. And if the document has an initials box on each page, initial every one: a contract returned without them gets sent back as often as one missing the signature itself.

The part worth being careful about

Your signature is a biometric identifier, and the documents you attach it to are the ones that matter most. Most online signing services keep both the signature image and the signed document on their servers, often indefinitely, and their terms usually permit it.

Signing in the browser avoids the question entirely: the document is never uploaded and the signature image never leaves your device. Save the signature as a transparent PNG on your own machine and reuse it — which also keeps it consistent across documents, something that matters more than it sounds when someone compares two of your signed contracts.