Are electronic signatures legally binding? UK, EU and US explained

Short answer: yes, for most business agreements. In the UK, the EU and the US, a contract isn’t invalid just because it was signed electronically. There are exceptions, though, and how you collect the signature matters if it’s ever challenged.

This guide is general information, not legal advice. For an important or unusual agreement, check with a lawyer.

What counts as an electronic signature?

An electronic signature is any electronic way of showing that a person agrees to a document: a typed name, a signature drawn on a screen, a click on an “I agree” button, or a cryptographic signature. What makes it a signature is the person’s intention to sign.

United Kingdom

English law has long accepted that a signature doesn’t have to be handwritten. The Electronic Communications Act 2000 confirms that electronic signatures can be used as evidence, and the UK retained the EU eIDAS rules on electronic signatures after Brexit. In 2019 the Law Commission of England and Wales reported that an electronic signature is capable of executing a document, including one that must be “signed”, as long as the signer intends to authenticate it and any formalities are met.

The main formality to watch is witnessing. Deeds (for example, some guarantees and powers of attorney) must be signed in the presence of a witness. They can be signed electronically, but the Law Commission’s view is that the witness must be physically present. Scotland and Northern Ireland have their own rules, so check if those apply.

European Union

The eIDAS Regulation (EU No 910/2014) says an electronic signature can’t be refused legal effect or admissibility in court just because it’s electronic. It defines three levels: simple, advanced and qualified. A qualified electronic signature has the same legal effect as a handwritten one across the EU. Simple and advanced signatures are valid too, and are widely used for everyday commercial agreements; their weight depends on the evidence behind them.

United States

The federal ESIGN Act (2000) and the Uniform Electronic Transactions Act, adopted by almost every state, give electronic signatures and records the same legal standing as paper ones for most transactions. Both require that the parties agree to do business electronically, which is why e-signature tools ask signers to consent before they sign.

Common exceptions

In most places, some documents need extra formalities or can’t be signed electronically at all. They typically include:

• wills and some trusts;
• deeds and documents that must be witnessed;
• transfers of land and property, which follow land registry processes;
• some court documents and official notices;
• certain consumer notices, such as some cancellation or eviction notices.

Everyday business agreements, such as proposals, statements of work, service agreements, NDAs and order forms, are generally fine to sign electronically.

Making your e-signatures stand up

If a signature is ever disputed, the question is evidence: can you show who signed, that they meant to, and exactly what they signed? Good practice is to:

• Record consent. Ask the signer to confirm they agree to sign electronically.
• Identify the signer. Send to their own email address and record their name, the time, IP address and device.
• Fix the document. Record a fingerprint (hash) of the exact version signed, so nobody can argue it changed afterwards.
• Keep an audit trail. Opened, viewed, signed, by whom and when, plus a certificate with the signed copy.
• Give everyone a copy of the signed document.

Frequently asked questions