Is an electronic signature legally binding in the UK?

Yes — for the overwhelming majority of business documents, and it has been settled for longer than most people assume. The more useful question, and the one that actually decides arguments, is whether you can prove who signed, what they signed, and when.

Pixacomms Ltd, Cardiff · Updated September 2026 · Legislation checked against legislation.gov.uk on 15 September 2026

The short answer

Under the law of England and Wales, an electronic signature is capable of executing a document provided two things are true: the person signing intended to authenticate the document, and any formalities that apply to that particular document were satisfied. That is not a supplier’s opinion. It is the Law Commission’s statement of the law, published in 2019 and accepted by government the following March.

So for the paperwork most businesses actually handle — contracts, engagement letters, NDAs, purchase orders, employment contracts, service agreements, consent forms, method statements — an electronic signature is binding, and it is admissible in evidence if you ever need to rely on it.

The exceptions are narrow, but they are real and worth knowing. So is the gap between a signature being valid and a signature being provable, which is the part nobody selling you software tends to dwell on.

The law, by name

Three instruments do most of the work, and it is worth being able to name them.

The Electronic Communications Act 2000. Section 7 provides that an electronic signature incorporated into or logically associated with an electronic communication or electronic data, and the certification of that signature, are admissible in evidence on questions of the authenticity or the integrity of that communication or data. In short: nobody can have your signature thrown out purely for being electronic.

The retained UK eIDAS Regulation. EU Regulation 910/2014 was retained in UK law after Brexit and amended to work domestically. Since the Retained EU Law (Revocation and Reform) Act 2023 the formally correct term has been assimilated law rather than retained, though almost everyone still says retained, and it is the same instrument either way. It remains in force: the legislation.gov.uk text was current to 15 September 2026 when this page was last checked, with amendments pending but no repeal. Article 25(1) says an electronic signature shall not be denied legal effect or admissibility as evidence solely because it is in electronic form, or because it does not meet the requirements for a qualified electronic signature. That second clause matters: the regulation expressly protects the ordinary, everyday kind of signature, not only the top tier.

The Law Commission’s 2019 report. Electronic execution of documents (Law Com No 386) was published on 4 September 2019 to settle this exact question, because commercial uncertainty was holding people back. Its statement of the law is the one quoted above, and it confirmed that an electronic signature is admissible to prove or disprove who signed and whether they meant to.

Underneath the statutes sits a long common-law tradition far less fussy about signatures than people expect. Courts have accepted a cross, initials alone, a rubber stamp of a signature, and a printed name. On the electronic side they have accepted a name typed at the bottom of an email and a tick in an “I accept” box on a website. What the law looks for is an authenticating intention, not ink.

The exceptions, honestly

Anyone who tells you every document can be signed electronically is selling something. These are the categories where extra requirements bite.

Deeds, and the witness problem

A deed signed by an individual must, under section 1 of the Law of Property (Miscellaneous Provisions) Act 1989, be signed in the presence of a witness who attests the signature. The Law Commission concluded that this requires the witness to be physically present — and said so explicitly even where both the signatory and the witness are signing electronically. Watching over a video call, or watching a signing platform update on screen, was not something it thought parties could safely rely on.

So a deed can be executed with an electronic signature, but the witnessing requirement does not go away and no software satisfies it for you. If a document needs to be a deed — a guarantee given without consideration, a power of attorney, a transfer of land — that is a question for your solicitor before you send it anywhere.

Wills

Section 9 of the Wills Act 1837 requires a will to be in writing, signed, and witnessed by two witnesses present at the same time. A temporary relaxation allowing witnessing by video link, introduced during the pandemic, has since expired. Electronic signing is not an established route for a will, and the Law Commission has previously taken the view that wills are the most likely case where the general position does not hold. Do not use a signing platform for one.

Land and property

A contract for the sale or other disposition of an interest in land can only be made in writing, must incorporate all the expressly agreed terms, and must be signed by or on behalf of each party — section 2 of the same 1989 Act. The transfer itself is a deed, so the witnessing point above applies as well. Separately, HM Land Registry sets its own rules about what it will accept on a registrable disposition, published in its practice guide on the execution of deeds. Conveyancing is its own world; follow your conveyancer, not a general guide.

Anything carrying its own formalities

The Law Commission’s wording is careful here, and so is ours: formalities can come from a statute, from a statutory instrument, or from the contract itself. A framework agreement saying variations must be signed in manuscript means what it says. Some regulated and sworn documents have their own rules too. If you are unsure whether a particular document carries a formality requirement, that is precisely the moment to ask rather than assume.

The three tiers: simple, advanced and qualified

The retained eIDAS Regulation defines three kinds of electronic signature. All three are legally effective. They differ in how much the technology proves on its own, before anybody has to argue about it.

The four advanced-signature requirements come from Article 26, the definitions from Article 3. Only a qualified signature gets the shortcut in Article 25(2), which gives it the equivalent legal effect of a handwritten signature.

It is easy to read that and conclude the other two tiers are second class. They are not, and Article 25(1) exists precisely to stop that argument. What a qualified signature buys is a presumption — you are not required to prove the point, it is handed to you. Everything below it is proved the ordinary way, on evidence. Which brings us to the part that actually matters.

Which tier Pixasign produces

Pixasign produces an advanced electronic signature. Not a qualified one. We say so here, and we say so on our security page, because finding that out from a counterparty mid-deal would be worse for everybody.

Every signed document is sealed as a PAdES B-T signature — the standard set out in ETSI EN 319 142 — using RSA-3072 with SHA-256, and carries an RFC 3161 timestamp issued by DigiCert. DigiCert is an independent, publicly trusted timestamp authority. That independence is the entire point of a timestamp: a company attesting to the time on its own documents is marking its own homework, and a counterparty is entitled to say so.

Validity is rarely the real question

The argument in a real dispute is almost never “an electronic signature cannot be binding”. That ship sailed. The arguments are these, and every one of them is evidential:

• “That was not me.” Somebody else had access to the inbox. The name was typed by an assistant. The login was shared.
• “That is not what I signed.” A schedule was swapped. A figure changed. The version in your folder is not the version that went out.
• “Not on that date.” The date printed on a document is only ever whatever somebody typed into it.

A valid signature you cannot evidence is worth very little once one of those three sentences is said out loud. This is where the method you used stops being a technicality.

Alongside the sealed PDF, Pixasign issues an evidence certificate: who signed, the address it was sent to, their IP and approximate location, the device, the full timeline to the second, and SHA-256 fingerprints of the document both before and after sealing. The events are hash-chained, so each one locks in the one before it — alter a character of the history and every seal after it breaks.

And it is checkable without us. Anyone can drop a file into our free public verifier — no account, no login — and be told whether anything has changed since it was sealed. A client, an insurer, a solicitor, somebody who has never heard of us. Evidence that only works while you keep paying a supplier is not evidence you control.

The practical effect is not that you win the argument. It is that the argument does not start, because the person who would have had to make it can already see how it ends.

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