Wet Signature vs. eSignature: When to Use Each? (By doc type, juristification, scenario)

A wet signature is a handwritten signature made with a pen on a physical document. An e-signature is a digital signature added through software like Papersign. Both are legally binding for the vast majority of documents, but each is better suited for certain documents and scenarios. Below is a decision framework for which one you need, sorted by document type, jurisdiction, and real-world scenario.

What is a wet signature?

A wet signature is the traditional handwritten signature you make with a pen on paper. It's called "wet" because of the ink. You'll also hear it called a manual signature, a physical signature, or an ink signature. The process is simple: someone signs their name by hand, and the mark itself is the proof of consent.

What is an e-signature?

An e-signature is any digital mark used to show intent to agree to a document. The process usually looks like this:

1. You prepare the document and place signature fields where you need them.
2. You add the signer's name and email, then send it.
3. The signer gets a notification, reviews the document, and adds their signature.
4. They submit it back, and you both get a signed copy with an audit trail attached.

Signers can type their name and let the software convert it to a signature style, draw it with a mouse or finger, or upload an image of their handwritten signature. Every method produces a valid, legally binding signature once submitted.

Which one do you actually need? A decision framework by document type

Most documents don't require a wet signature. But a handful of document and contract types either require one by law or are safer signed by hand until regulations catch up. Here's how to sort your document before you reach for a pen or a laptop.

Documents that typically need a wet signature:

• Wills and testamentary trusts. Most jurisdictions still require a physically witnessed, handwritten signature for a will to be valid.
• Notarized documents. If a notary public needs to witness the signing in person, you need a wet signature, unless your state or country has adopted remote online notarization (more on that below).
• Certain deeds and mortgage documents. Property transfers and some collateral documents (like deeds of trust) are frequently carved out of e-signature laws.
• Government forms with specific statutory requirements. Some court filings, affidavits, and government applications still mandate a handwritten signature.

Documents that are safe and standard to sign electronically:

• Contracts and service agreements. Freelance contracts, vendor agreements, and client contracts are all routinely signed electronically and hold up in court.
• Invoices and purchase orders. No special requirement here.
• HR documents. Offer letters, employment agreements, and policy acknowledgments are commonly e-signed, and Papersign's audit trail gives you a clean record for compliance.
• Sales proposals and quotes. Speed matters here more than anywhere else. An e-signature can close a proposal in minutes instead of days.

If your document isn't on the "needs a wet signature" list, default to e-signature. It's faster, cheaper, and just as enforceable.

Which one you need, by jurisdiction and scenario

Document type isn't the only variable. Where you're signing, and the situation you're signing in, both change the answer.

By jurisdiction:

E-signatures are broadly accepted across the US under the ESIGN Act, Australia (under the Electronic Transactions Act), the EU and UK (under eIDAS), and most other developed economies. But acceptance isn't universal or uniform. Some jurisdictions still exclude specific document categories (wills and certain real estate transactions are the most common carve-outs), and cross-border contracts can trigger questions about which country's e-signature law applies. If you're signing an international agreement involving property, inheritance, or government compliance, check the specific requirements for both parties' jurisdictions before you default to e-signature.

By scenario:

• Remote signer, no time pressure: E-signature, no contest. There's no reason to mail a document across the country or the world when the outcome is identical.
• Need it signed today: E-signature. A wet signature depends on physical proximity or postage, both of which cost you days you don't have.
• A notary needs to be present: This depends on where you are. Many US states now allow remote online notarization (RON), where a notary witnesses the signing over video call. Where RON isn't yet legal, you'll need an in-person wet signature.
• High-value, high-risk document (property, estate, large financing): Lean wet signature unless you've confirmed with a lawyer that e-signature is fully accepted for that specific document type in your jurisdiction.
• Internal, low-risk agreement (NDA, internal policy sign-off): E-signature, every time. There's no regulatory reason to slow this down.

Are both legally binding?

Yes, in the vast majority of cases. Where e-signatures fall short is the same narrow list from the decision framework above: wills, some notarized documents, and certain deeds or collateral documents. The American Bar Association still recommends wet signatures for promissory notes and mortgage-related paperwork specifically.

This is where compliance features matter more than the signature method itself. Papersign meets the technical requirements of the ESIGN Act, Australia's ETA, and eIDAS, and adds SOC 2 and GDPR-aligned data handling on top. Every signed document comes with an audit trail and a signed document certificate, so if a signature is ever challenged, you have a timestamped record of who signed, when, and from where.

Wet signature vs. e-signature: quick comparison

FAQ

What is a wet signature?

A wet signature is a handwritten signature made with a pen on a physical document. It's called "wet" because of the ink used to make the mark, and it's the traditional method of signing before e-signature software existed.

Is an electronic signature the same as a digital signature?

Not quite. "Electronic signature" is the broad legal term covering any digital mark showing intent to sign, including typed names and drawn signatures. "Digital signature" technically refers to a specific type of e-signature secured with cryptographic encryption. In everyday use, most people use the terms interchangeably.

Which documents legally require a wet signature?

Wills, most notarized documents (unless your jurisdiction allows remote online notarization), and certain deeds or mortgage-related documents typically still require a wet signature. Standard contracts, invoices, and HR documents don't.

Are electronic signatures legally binding in Australia?

Yes. The Electronic Transactions Act 1999 establishes e-signatures as legally valid in Australia for the vast majority of documents, with limited exceptions for things like wills and some statutory declarations.

Can a wet signature be scanned and used as an electronic signature?

Yes, a scanned image of a wet signature can be inserted into a digital document and used the same way a typed or drawn e-signature would be, as long as both parties consent to signing electronically.

Can I use an e-signature for a contract that also needs a notary?

It depends on your jurisdiction. If remote online notarization is legal where you're signing, you can complete the entire process electronically, including the notarization. If it isn't, you'll need an in-person wet signature for the notarized portion.