Are electronic signatures legally binding? ESIGN, UETA, eIDAS and the exceptions

The short answer is yes: in the United States, the European Union and the United Kingdom, a contract is not invalid merely because it was signed on a screen. An NDA, an offer letter, a sales order, a consulting agreement or a lease signed electronically is, in the ordinary case, as enforceable as one signed in ink.

The longer answer has two parts. First, "legally binding" depends less on the signature than on the evidence around it — who signed, whether they meant to, and whether the document has changed since. We have written about that separately, in what makes an electronic signature binding. Second, every one of these laws carves out a list of documents it does not cover. That list is what this piece is mostly about, because it is where people get caught.

The United States: ESIGN and UETA

Two laws do the work. The ESIGN Act, a federal statute from 2000, says a signature, contract or record relating to a transaction in interstate or foreign commerce may not be denied legal effect solely because it is electronic. The Uniform Electronic Transactions Act (UETA) says much the same thing at state level, and has been adopted by 49 states, the District of Columbia and several territories. New York is the exception: it has its own Electronic Signatures and Records Act, which reaches broadly the same result by a different route.

Neither law requires a particular technology. A typed name, a drawn mark, a click on a button that says "I agree" — any of them can be an electronic signature, provided it was adopted with the intent to sign. Neither law forces anybody to accept an electronic signature either: both parties have to agree to do business electronically, which in practice is shown by their conduct, and in consumer transactions by an explicit consent disclosure.

That consumer disclosure is one of the places a careless process falls down. When another law requires information to be given to a consumer in writing, ESIGN only lets you give it electronically if the consumer has first consented, been told they can have paper, and been told how to withdraw. A signing tool that skips the disclosure has not made the signature invalid, but it has made the record weaker exactly where a consumer would challenge it.

What ESIGN and UETA do not cover

ESIGN lists its exceptions in 15 U.S.C. § 7003. UETA's list is shorter, and individual states have added their own. Taken together, these are the documents where you should not assume an electronic signature will do:

Two further categories are not excluded, but are not straightforward either. Documents that must be notarised can be signed electronically only by a process the notary's state allows; most states now permit some form of remote online notarisation, with its own identity checks and recordings, and an ordinary e-signature platform is not one. Real estate deeds can be signed electronically in principle, but whether a county recorder will accept one depends on whether the state has adopted the uniform electronic recording act and on the recorder's own systems. A contract to buy a house is usually fine to e-sign; the deed that conveys it is the bit to check.

The European Union: eIDAS

In the EU the relevant law is eIDAS, Regulation (EU) No 910/2014, amended in 2024 by the regulation usually called eIDAS 2, which mostly concerns digital identity wallets and leaves the signature rules intact. Article 25 says an electronic signature may not be denied legal effect, or refused as evidence in court, solely because it is electronic. So far this is the same principle as ESIGN.

Where eIDAS differs is that it names three levels, and gives the top one a special status:

For most commercial contracts between businesses, a simple electronic signature is enough: the contract is valid and the signature is evidence. The levels matter when member-state law requires a particular form. Germany is the usual example. Where German law requires written form, it can generally be met electronically only with a qualified signature, and some documents exclude electronic form altogether — terminating an employment contract under § 623 BGB has to be done on paper with a wet signature. Property transfers in many member states need a notary whatever the signature. If a statute in the relevant country asks for writing, check what it accepts before choosing a tool.

The United Kingdom

The UK kept a domestic version of eIDAS after leaving the EU, alongside the Electronic Communications Act 2000. The Law Commission's 2019 report confirmed what the courts had been saying for some time: an electronic signature can validly execute a document, including one that statute requires to be signed, provided the signer intended to authenticate it. Deeds are the qualification. A deed signed by an individual needs a witness, and the prevailing view is that the witness must be physically present when it is signed, even if the signature itself is electronic. HM Land Registry accepts electronically signed deeds only through processes it has approved. Wills in England and Wales still need ink and two witnesses.

Where XDocs fits

XDocs implements the US ESIGN and UETA requirements in full: a separate act of signing, a versioned consent disclosure taken before any field accepts input, a frozen snapshot of what was sent, and a signed PDF with a certificate of completion delivered to every party. In eIDAS terms its signatures are simple electronic signatures, which are valid for the large majority of business agreements in the EU and UK.

A practical checklist

1. 1

   Check the document is not on an excluded list

   Wills, family law, court papers, negotiable instruments, notices of foreclosure or eviction. If it is, use the formality the law asks for.

2. 2

   Check whether a statute requires a particular form

   Notarisation, witnessing, a deed, or written form under a European civil code. These are the cases where an ordinary e-signature may not be enough.

3. 3

   Get consent before collecting the signature

   Especially from consumers. The consent should be recorded, with the wording that was shown.

4. 4

   Make sure the record can answer the questions a court would ask

   Who signed, when, from where, what they saw, and whether the document has changed since. An audit trail and a document digest answer those; a picture of a signature pasted onto a PDF does not.

5. 5

   Give every party a copy

   Retention is part of the statute, and a copy held only by the sender is weaker evidence than one held by both sides.

If you have a PDF to sign yourself and no counterparty, the free sign-PDF tool adds your signature in the browser. If somebody else needs to sign, and you want the record described above, send it from XDocs — or start from one of the agreement templates, which already have the signature blocks in place.