Simple, advanced and qualified electronic signatures in the UK
UK law recognises three levels of electronic signature. They differ in how strongly a signature is tied to the person and the document, not in whether the signature counts. Here is what each level means and when to use it.
The three levels at a glance
- Simple electronic signature. Any electronic data that a person uses to sign: a typed name, a drawn signature, a ticked box.
- Advanced electronic signature. Uniquely linked to the signer, able to identify them, created using data they alone control, and linked to the document so that any later change is detectable.
- Qualified electronic signature. An advanced signature created with a qualified certificate and a qualified signature creation device, issued through an approved trust service provider. In UK law it has the same legal effect as a handwritten signature.
Simple: what most documents use
A simple electronic signature is valid. UK law says an electronic signature cannot be denied legal effect or refused as evidence just because it is electronic. The question that comes up if it is challenged is not “was it the right type?” but “can you show the person meant to sign?”. A good record helps: the email the signer received, when they opened and signed, and a copy of the finished document that has not changed.
Advanced: stronger proof of who signed
Advanced signatures are used when you want more than an email link as evidence, for example in regulated industries or with high-value contracts. They usually involve an identity check, and the signature is bound to the document cryptographically.
Qualified: the highest level
A qualified signature is the only electronic signature the law treats as equivalent to a handwritten one by default. It needs a qualified certificate from a provider on the UK trusted list and special signing hardware or a secure remote service. It costs more and takes more effort, so it is normally reserved for documents where the other side or a regulator specifically asks for it.
If you will use a signed document in the EU, the EU applies its own version of these rules, so check what the other side needs.
Choosing the right level
- Ask whether a law, regulator or the other party requires a particular type or a paper signature. If so, follow that.
- If not, ask how costly it would be if the signature were disputed. For ordinary documents, a simple signature with a clear record is usually proportionate.
- For high-value or sensitive documents, add something stronger: an identity check, a witness, signing in person, or a higher-level signature.
Some documents cannot be signed electronically at all or need extra steps. See which documents can’t be signed electronically.
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