What is a digital signature?

When you apply a digital signature, the signing software creates a unique fingerprint of the document at that exact moment. That fingerprint is locked to your identity using a private code that only you hold. Anyone who later opens the document can check that the fingerprint still matches and if the document has been changed even slightly since you signed, the check fails and the signature shows as invalid.

This makes a digital signature fundamentally different from other types of electronic signature. A typed name or a drawn squiggle confirms intent, but it does not prove identity and it does not detect tampering. A digital signature does both, automatically.

Digital signatures are legally recognised in the UK, the EU, and the US. At the highest level, they carry exactly the same legal weight as a handwritten signature. They are most commonly used for high-value contracts, property transactions, regulated documents, and any situation where it matters beyond doubt that the right person signed and the document has not been touched since.

Basic Questions

Is a digital signature the same as an electronic signature?

No, though the two terms are often confused. An electronic signature is the broad term. It covers any electronic method of signing a document, from a typed name to a tick-box to a drawn squiggle. A digital signature is one specific, more secure type of electronic signature.

Think of it this way: all digital signatures are electronic signatures, but most electronic signatures are not digital signatures. The key difference is what a digital signature adds: proof of identity and automatic detection of any changes to the document after signing. For a full side-by-side comparison, see Electronic signature vs digital signature: what is the difference?.

Is a digital signature legally valid?

Yes, in the UK, EU, and US. Digital signatures are recognised in law and carry the same legal weight as a handwritten signature when they meet the relevant standard. In the UK, they are covered by the Electronic Communications Act 2000. In the EU, the eIDAS Regulation gives a qualified digital signature identical legal standing to a handwritten signature. In the US, the ESIGN Act 2000 applies.

As with all electronic signatures, a small number of document types are excluded. Wills in England and Wales, for example, still require a wet-ink signature. For everything else, a digital signature is fully valid.

How is it different from just typing my name?

A typed name is an electronic signature, and is legally valid for most documents, but it provides minimal protection if someone challenges it. Anyone can type your name. There is no automatic record proving that you, specifically, signed at a particular time, or that the document has not been altered since.

A digital signature solves both problems. It is tied to a verified identity, not just a name. And it creates an automatic record that makes any change to the document visible after the fact. If the document is altered even slightly after you sign it, the signature shows as invalid the next time anyone opens it. A typed name cannot do either of these things.

Do I need to understand how it works to use one?

No. The technology behind a digital signature (the cryptography, the keys, the certificates) is handled entirely by the platform or software you use. As a signer, the experience is usually straightforward: you receive a link, open the document, and sign. The platform does everything else.

Where it helps to understand the basics is when you are choosing whether you need a digital signature at all, or which type. The rest of this page covers those questions in plain English.

Do I need special software?

To create a digital signature, yes. You need a platform or service that can manage the certificate and apply the signing process. In most cases this is an e-signature platform, which is a web-based service. The person signing usually does not need to install anything or create an account. They follow a link, sign, and the platform handles the rest.

To check whether a digital signature is valid, most people already have what they need. Adobe Acrobat Reader, which is free, verifies digital signatures automatically when you open a signed PDF. It shows whether the signature is valid, when it was applied, and whether the document has been changed since signing.

Going Deeper

What is a digital certificate and why does it matter?

A digital certificate is what connects your digital signature to your verified identity. It is issued by a Certificate Authority. This is an organisation that has checked who you are before issuing the certificate, in the same way a bank checks your identity before issuing a card.

Without a certificate, a digital signature is just a mathematical mark with no verified owner. With a certificate, anyone who receives your signed document can confirm that the signature belongs to you specifically, not just to someone who typed your name.

In the UK, certificate authorities must be listed on a government-maintained trusted list overseen by the Information Commissioner’s Office (ICO), which is being renamed the Information Commission in 2026. In the EU, each member state maintains its own trusted list. Only certificates from listed authorities qualify for the highest legal tier of digital signature.

Are there different levels of digital signature?

Yes. The law recognises three tiers, and the level you need depends on what you are signing.

A simple electronic signature is any electronic indication of intent to sign, such as a typed name and a tick-box. It is not a digital signature.

An advanced electronic signature is the standard offered by most reputable signing platforms. It is linked to your identity, and any change to the document after signing is automatically detectable. This is a digital signature.

A qualified electronic signature is the highest tier. It is backed by a certificate from a government-approved authority and, in law, carries the same weight as a handwritten signature. It cannot be rejected solely because it is electronic. Getting a qualified certificate requires verified identity checks, typically a government-issued ID check.

For everyday commercial contracts, an advanced digital signature is sufficient. A qualified signature is used for high-value or regulated transactions, or where the law specifically requires it.

Can a digital signature be faked or forged?

In practice, no - provided the signing system is properly set up. The security of a digital signature depends on your private key remaining secret. If it does, no one else can reproduce your signature. The mathematical systems used are designed so that even with substantial computing power, deriving a private key from the public information is not feasible.

The real risk is not mathematical - it is practical. A private key that is stolen, shared, or stored carelessly can be misused. This is why the highest-tier digital signatures are created using certified hardware that generates and stores the private key in a way that prevents it being extracted at all.

If a document is altered after signing, the signature automatically shows as invalid. You do not need to spot the change yourself - the software does it.

Where are digital signatures commonly used?

Digital signatures are used wherever the identity of the signer and the integrity of the document need to be provable. Common uses include:

• High-value commercial contracts where a dispute would be costly
• Property transactions. HM Land Registry accepts digitally signed deeds through specific processes set out in Practice Guide 82 (updated 7 July 2025)
• Financial services agreements and regulated documents
• Cross-border transactions within the EU, where a qualified digital signature has a specific legal guarantee
• Government filings and tax returns. HMRC accepts digital signatures on a range of forms

They are also used in software and technology to sign code, proving that software has not been altered since it was released, though that is outside the scope of this guide.

What is the position for property transactions?

HM Land Registry accepts two methods for electronically processed property deeds, both set out in Practice Guide 82 (updated 7 July 2025).

A Mercury signature involves signing a printed page in wet ink in front of a witness, then scanning it. This counts as an electronic signature under the eIDAS definition but uses a traditional physical signature at its core.

A Conveyancer-Certified Electronic Signature (CCES) is a fully platform-based process where you sign electronically, still in the physical presence of a witness. The conveyancer certifies that the correct steps were followed.

HM Land Registry is also running a pilot scheme accepting qualified digital signatures for a limited range of transactions. In both cases, the physical presence of a witness remains required for deeds. Remote or video witnessing is not accepted. Applications must be submitted to HMLR electronically.

Does it work differently in Scotland?

The technology is the same but the legal consequences differ for formal documents. In Scotland, a document that carries a qualified digital signature is ‘self-proving’ meaning a court presumes it is valid without needing additional evidence. A document with an advanced digital signature does not have that status, though it does satisfy the authentication requirement for formal documents.

For everyday commercial contracts that do not require formal writing, any level of digital signature works in Scotland, as elsewhere in the UK.

The Scottish rules are set out in the Electronic Documents (Scotland) Regulations 2014.

What is the position in the EU after eIDAS 2.0?

The EU updated its electronic signature rules in 2024 with a new regulation known as eIDAS 2.0. The core rules about digital signatures remain the same. What eIDAS 2.0 adds is a mandatory EU Digital Identity Wallet, which every EU member state must make available to citizens by the end of 2026. This wallet will allow citizens to use a qualified digital signature free of charge for personal use.

This does not apply to the UK. The UK has its own framework, based on the original eIDAS rules as they were written into UK law after Brexit. UK-issued digital signature certificates are not automatically recognised within the EU’s mutual recognition system, which is a practical consideration for organisations operating across both jurisdictions.

Legislative references

Every factual claim on this page traces to one of the following primary sources.

UK

Electronic Communications Act 2000 (c. 7), s. 7 - makes electronic and digital signatures admissible as evidence in UK proceedings. legislation.gov.uk/ukpga/2000/7

Electronic Identification and Trust Services for Electronic Transactions Regulations 2016 (SI 2016/696) - brings the eIDAS framework into UK law; ICO designated as supervisory authority. legislation.gov.uk/uksi/2016/696

Requirements of Writing (Scotland) Act 1995; Electronic Documents (Scotland) Regulations 2014 (SSI 2014/83) - Regulation 2: advanced signature for authentication; Regulation 3: qualified signature for self-proving status. legislation.gov.uk/ssi/2014/83

Law Commission, Electronic Execution of Documents, Law Com No 386 (2019) - confirms digital signatures valid for deeds; physical witness presence required. lawcom.gov.uk — Electronic Execution of Documents

HM Land Registry, Practice Guide 82 (updated 7 July 2025) - Mercury signatures and CCES; QES pilot; physical witness required; electronic submission required. gov.uk — Practice Guide 82

Data (Use and Access) Act 2025 (c. 18), Part 2 - Digital Verification Services (DVS) framework; OfDIA. In force 1 December 2025. legislation.gov.uk/ukpga/2025/18/part/2

EU

eIDAS Regulation (EU) No 910/2014 - defines advanced and qualified electronic signatures; Article 25(2): qualified signature has same legal effect as handwritten signature. eur-lex.europa.eu — CELEX:32014R0910

eIDAS 2.0 (Regulation (EU) 2024/1183, in force 20 May 2024) - mandates EU Digital Identity Wallet by end of 2026; qualified signatures free of charge to individuals for non-professional use. Does not apply to the UK.

US

ESIGN Act 2000, 15 U.S.C. §§ 7001–7031 - electronic and digital signatures legally equivalent to handwritten signatures in interstate and foreign commerce. uscode.house.gov — 15 U.S.C. Chapter 96

Uniform Electronic Transactions Act (UETA) - adopted by 49 states and the District of Columbia. uniformlaws.org — UETA adoption table

All information on this page was accurate as of May 2026. Produced by Signatures.com, an independent editorial authority. Not legal advice.