Electronic signature vs wet signature: which do you need?
For almost every business agreement, an electronic signature is all you need — and it is usually stronger on proof than wet ink. A "wet signature" (or "wet ink signature") simply means a signature written by hand in ink on paper; the word "wet" refers to the ink being wet when applied. An electronic signature is applied digitally instead. Both are legally recognised in the UK, EU and US, but they behave very differently on speed, cost and, crucially, evidence. A handful of document types — some deeds, wills and land transactions — may still call for wet ink or a witness, and we cover those carefully below.
What each term actually means
Wet signature / wet ink signature: a signature made by physically writing your name (or making a mark) in ink on a paper document. The phrase "wet ink" is a bit of a throwback — it distinguishes a freshly hand-signed page from a printed, faxed or digital one.
Electronic signature: data in electronic form that a person applies to indicate they agree to a document. That ranges from a typed name or a signature drawn on a screen, up to a fully audited e-signature with verified identity and a tamper-evident record. All of these are electronic signatures in law; they differ enormously in how much they can prove.
If you want the deeper legal grounding, our guide on whether electronic signatures are legally binding sets out the eIDAS, ESIGN and UETA position in plain English.
Wet vs electronic: side by side
Wet signatureElectronic signature
What it is
Ink signed by hand on paper
A signature applied digitally — typed, drawn, or a verified, audited e-signature
Speed
Slow — print, sign, scan or post, wait for each party
Minutes — sent and signed from anywhere, in one tap
Cost
Printing, postage, storage, chasing
Little to none per document; no physical handling
Proof / audit trail
The paper itself; no record of when or by whom unless witnessed or notarised
Can include verified identity, timestamps, a full audit trail and tamper-evidence
Legal standing
Widely accepted; long-established
Recognised under eIDAS, ESIGN and UETA for most agreements
When required
Occasionally — some deeds, wills, and certain land or statutory documents
The vast majority of commercial and everyday agreements
The striking line in that table is proof. People assume wet ink is the "serious" option, but a bare paper signature records almost nothing beyond the mark itself — not who really signed, not when, not whether a page was swapped afterwards. A well-built electronic signature can carry far more evidence than ink ever could.
Why electronic is often stronger on proof
A hand-signed page tells you someone wrote a name. It does not, on its own, tell you when they signed, whether they were who they claimed to be, or whether the document in front of you is the one they actually signed. To get that certainty with paper, you traditionally add a witness or a notary.
A properly audited electronic signature builds much of that evidence in by default:
- Identity — the signer can be verified rather than assumed.
- Intent — a deliberate, recorded act of agreeing to these specific terms.
- Integrity — the document is sealed so any later change is detectable.
- Audit trail — a timestamped record of every step: sent, opened, viewed, signed.
This is where the distinction between a simple e-signature and a cryptographically sealed one matters; our piece on electronic signature vs digital signature unpacks it. It is also why a scanned wet signature is often the weakest option of all: you lose the physical original and gain a reusable image with no audit trail.
The cases where wet ink or a witness may still matter
Electronic signatures cover the overwhelming majority of business documents, but a small set of instruments still attract extra formality. Treat these as flags to check, not firm rules — requirements vary by jurisdiction and change over time:
- Deeds. Deeds often require a witness, and some parties still prefer wet ink for them. Electronic execution of deeds is increasingly accepted in the UK, but practice and lender or counterparty requirements vary — confirm before you rely on it. Our guide on whether electronic signatures need a witness goes into more detail.
- Wills. Wills are subject to strict statutory formalities and, in many places, are still expected to be signed on paper with witnesses. Do not assume an ordinary e-signature is sufficient for a will.
- Land and property. Certain land transactions, registrations and dispositions carry specific execution or registration requirements. Some can be handled electronically; others may need particular forms or wet-ink execution.
- Statutory or regulated documents. A minority of official filings, notarised documents and specific regulated forms still specify a manuscript signature or a particular process.
For these categories, the safe move is to confirm the requirement for your jurisdiction and the specific document before signing — ideally with a qualified professional.
So which do you need?
For the everyday reality of running a business — engagement letters, statements of work, NDAs, supplier and client contracts, consents and approvals — an electronic signature is enough, faster, cheaper, and stronger on proof. Reserve wet ink for the narrow set of instruments that genuinely demand it, and check rather than assume.
If you want electronic signatures that are actually built for evidence, that is the point of Signet. Clients sign in one tap with no account and no login. Every agreement carries a tamper-evident audit trail, a certificate of completion, and a publicly verifiable seal anyone can check — aligned with eIDAS, ESIGN and UETA, with UK and EU data residency, and your documents are never used to train AI. You can read how it works on our security page, or start with the basics in how to sign a PDF online.
This is general information, not legal advice. For your specific situation, and especially for deeds, wills and land, consult a qualified professional.
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