Guide · Updated · By Buğra Sözeri
Electronic Signature vs Wet Signature
A wet signature is a signature made by hand, in ink, on paper. An electronic signature is any electronic sign of intent to agree: a typed name, a drawn signature on a screen, a click on "I agree". For most everyday business contracts, the law in the US, the UK and the EU treats them as equally capable of binding you. But there are still documents where paper, a witness or a notary is required. This guide explains the difference, where the exceptions usually are, and how to decide, without pretending to be legal advice for your specific case.
What is the difference between a wet and an electronic signature?
A wet signature proves intent physically: a person put pen to paper, and the original document carries the ink. An electronic signature proves intent with data: who signed, when, from which email address and device, and what exactly the document said at that moment.
The practical differences are speed, cost and evidence. Paper needs printing, posting or meeting, and a scan of a signed page is itself just an image. A good e-signature service records an audit trail and locks the final file, so tampering is detectable. On eSignSimple, the finished PDF gets a SHA-256 fingerprint anyone can check on our verify page.
When is an electronic signature legally enough?
In the United States, the federal ESIGN Act and the Uniform Electronic Transactions Act (UETA), adopted by almost every state, say a signature or contract may not be denied legal effect solely because it is electronic. In the EU, the eIDAS Regulation says an electronic signature cannot be denied legal effect or admissibility just because it is electronic; only a qualified electronic signature automatically has the same effect as a handwritten one.
So sales agreements, freelance and consulting contracts, NDAs, leases in many places, offer letters, invoices and purchase orders are typically fine with a simple electronic signature. Our overview are electronic signatures legally binding goes deeper, and country detail lives on our legality pages, such as United States, United Kingdom and European Union.
When is a wet signature still required?
The exceptions vary by country, but they cluster around the same kinds of documents. ESIGN itself excludes wills, codicils and testamentary trusts; many family law matters such as adoption and divorce; court orders and official court documents; and certain notices, such as utility shut-offs, foreclosure or eviction notices, and cancellation of health or life insurance.
Beyond that, watch for three triggers. Formality rules: deeds, powers of attorney and property transfers may need a witness, a notary or a specific form, which in some countries means paper or a qualified signature. Registries: land registries, company registries and some government agencies accept only particular formats. And the other party: a bank, landlord or employer can simply insist on ink, and in practice their rules win.
In the EU, member states decide which transactions need a handwritten or qualified signature; real estate and family law are commonly on the list. Check the specific country page, for example Germany or France, and ask a lawyer when the stakes are high.
Which is stronger evidence in a dispute?
People assume ink is safer. Often it is not. A disputed wet signature leads to handwriting comparison and questions about which version of the page was signed. A disputed electronic signature leads to the record: the email invitation, timestamps, IP addresses, and a document hash showing nothing changed after signing. Neither is proof against every argument, but an e-signature with a complete certificate of completion is usually easier to explain.
What weakens an e-signature is sloppy process: sending to a shared inbox, not keeping the final file, or letting the signer edit the document. Our guide what is an audit trail explains what a good record contains.
How do you decide for a specific document?
Ask four questions. Is this document type on an exception list in your country? Does a law, registry or regulator require a witness, notary or qualified signature? Does the other party accept electronic signatures? And would you be comfortable showing the signing record to a judge? If the first two are no and the last two are yes, an electronic signature is the practical choice.
If you only need to sign something yourself, our free Sign PDF tool works in the browser. To collect signatures with a full record, see how to send a document for signature.
Our take
We think ink should be the exception you justify, not the default you fall back on. For the contracts freelancers and small businesses sign every week, an electronic signature is faster, cheaper and leaves better evidence than a scanned page. But know the edges: wills, many property deeds, powers of attorney and court papers are where you should stop and check, and eSignSimple provides simple electronic signatures only, not the qualified signatures some EU transactions require. When a lawyer or registry says paper, use paper.
Frequently asked questions
Is an electronic signature as valid as a handwritten one?
For most business contracts in the US, UK and EU, yes: the law says it cannot be denied effect just because it is electronic. Some documents are excluded or need extra formalities.
Can I e-sign a will?
Generally no. ESIGN excludes wills and most jurisdictions require handwritten signatures and witnesses; a few places have created narrow electronic will rules. Ask a lawyer.
Is a scanned wet signature an electronic signature?
A scanned signature pasted into a document can count as an electronic signature, but on its own it is weak evidence. An e-signature service adds the audit trail that shows who signed and when.
What is a qualified electronic signature?
Under eIDAS it is the highest level: created with a qualified certificate and device, with the same legal effect as a handwritten signature across the EU. eSignSimple does not offer it.
Can the other party refuse an electronic signature?
Yes. ESIGN does not force anyone to use electronic records; both sides need to agree. In practice most businesses accept them.
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