Are Electronic Signatures Legal in the UK? eIDAS and the ECA 2000

Electronic signatures are legal in the United Kingdom, and have been for over two decades. For the vast majority of business and personal documents — contracts, NDAs, employment agreements, service terms — an electronic signature is just as enforceable as a pen-on-paper one. The law that establishes this is clear, and it was reinforced by an authoritative government-backed review in 2019. Here is what actually governs e-signatures in the UK, and the short list of exceptions where you still cannot use them.

The two laws that matter

UK e-signature validity rests on two pillars:

• The Electronic Communications Act 2000 (ECA 2000). Section 7 establishes that an electronic signature is admissible as evidence in legal proceedings. This is the foundational statute.
• UK eIDAS. After Brexit, the EU eIDAS Regulation was retained in UK law as “UK eIDAS.” It confirms that a signature cannot be denied legal effect simply because it is electronic, and it defines three tiers of signature (see below).

On top of the statutes, the Law Commission published a 2019 report confirming that electronic signatures are valid for executing documents under English law, including where a statute requires a “signature.” A 2020 industry working group went further on practical execution. In short: the legal question was settled, and settled favourably.

The three tiers of signature under UK eIDAS

1. Simple Electronic Signature (SES). Typing your name, clicking “I agree,” or drawing a signature with your finger. Legally valid for most everyday agreements.
2. Advanced Electronic Signature (AES). Uniquely linked to the signer, capable of identifying them, and able to detect any later tampering. Stronger evidential weight.
3. Qualified Electronic Signature (QES). An AES created with a qualified device and backed by a qualified certificate. The highest tier, and the only one the law treats as automatically equivalent to a handwritten signature.

Crucially, you do not need QES for ordinary contracts. A simple electronic signature is enough to form a binding agreement, provided the usual contract requirements — offer, acceptance, consideration, intention to be bound — are met.

What makes a UK e-signature hold up

Legality is the baseline; enforceability in a dispute is what you actually care about. Two documents signed the same day can fare very differently in court depending on the evidence behind them. The deciding factor is almost always the audit trail: a record of who signed, when, from what IP address, and confirmation the document was not altered afterwards. A tamper-evident hash sealing the final document is what turns “they clicked a button” into defensible evidence.

The exceptions: where wet ink still rules

A narrow set of documents fall outside electronic execution under UK law or in practice:

• Wills and codicils.
• Some property-related deeds where registration formalities or HM Land Registry practice still expect specific execution.
• Certain statutory notices and documents that name a required physical form.

For everything else — the documents a business actually signs day to day — electronic signatures are the norm, not the exception.

The bottom line

If you run a UK business, you can sign and send the overwhelming majority of your agreements electronically with full legal confidence, as long as your tool captures a proper audit trail and seals the finished document. For a wider view of how this compares across borders, see our guides on the EU under eIDAS and the US ESIGN Act.

This article is general information, not legal advice. For high-value or unusual documents, consult a solicitor.