A "wet signature" is the traditional way of signing: putting pen to paper and leaving wet ink. An electronic signature does the same job digitally. Both are legally valid in most situations — but they differ a lot in speed, security, and how easily you can prove them later. Here's the full comparison.
What is a wet signature?
A wet signature is a physical mark made by hand — your name signed in ink on a paper document. The name comes from the fact that the ink is literally wet when you sign. For centuries it was the default way to show agreement, and it's still required for a few specific document types in some places.
What is an electronic signature?
An electronic signature is any electronic indication of intent to agree to a document — typing your name, drawing a signature with a mouse or finger, or clicking "I agree." Under laws like the US ESIGN Act and the EU's eIDAS regulation, electronic signatures are legally recognized and enforceable for the vast majority of documents. Learn more in how to create an electronic signature.
Side-by-side comparison
| Wet signature | Electronic signature | |
|---|---|---|
| Speed | Print, sign, scan, mail | Signed in under a minute, remotely |
| Cost | Paper, ink, postage, storage | Little to none |
| Proof of signing | Relies on the physical page | Audit trail: email, IP, timestamps |
| Tamper evidence | Hard to detect alterations | SHA-256 hash detects any change |
| Storage | Physical filing, can be lost | Stored digitally, easy to retrieve |
| Legal validity | Valid | Valid in most cases (ESIGN, eIDAS) |
Is an electronic signature as valid as a wet one?
For most contracts, yes. The ESIGN Act (US) and eIDAS (EU), along with similar laws worldwide, establish that a signature can't be denied legal effect simply because it's electronic. For the details and the rare exceptions, see are electronic signatures legally binding?
When is a wet signature still needed?
A handful of document types may still require a wet-ink signature (and sometimes a witness or notary), depending on your jurisdiction — for example wills, certain deeds, and some court or government filings. When in doubt about these specific documents, check your local rules or ask a lawyer.
Why electronic usually wins
Beyond convenience, the biggest advantage of e-signatures is proof. A wet signature just sits on a page — if someone disputes it, you're relying on the paper itself. An electronic signature comes with a complete audit trail and tamper-evidence baked in, so you can actually demonstrate who signed, when, and that nothing changed afterward.
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Disclaimer: This article is for general informational purposes only and is not legal advice. Laws vary by jurisdiction; consult a qualified lawyer for important documents.