Are E-Signatures Legally Binding? What the Law Actually Says.

Electronic signatures are legally binding in the United States under the ESIGN Act (2000) and UETA (adopted by 49 states plus DC), in the EU under eIDAS (2014), and in the UK under the Electronic Communications Act (2000). They carry the same legal weight as handwritten signatures for the vast majority of transactions. This is not a gray area — it is settled law, and it has been for over two decades. If you have ever signed a document on your phone and wondered whether it would actually hold up, the answer is yes.

This post walks through the specific statutes that make e-signatures legally binding, how the rules differ between the US and the EU, what the actual exceptions are, and what you should know if you are signing or requesting signatures on documents that matter.

One important note before we begin: we build a document scanner and e-signature app, not a law firm. This post cites real statutes and regulations, but it is general information, not legal advice. For questions about a specific contract or transaction, consult an attorney licensed in your jurisdiction.

United States: the ESIGN Act

The primary federal law governing electronic signatures in the United States is the Electronic Signatures in Global and National Commerce Act, commonly known as the ESIGN Act. It was signed into law on June 30, 2000, and it took effect on October 1, 2000.

The core provision is Section 101(a), which states: "a signature, contract, or other record relating to such transaction may not be denied legal effect, validity, or enforceability solely because it is in electronic form." In other words, an electronic signature cannot be rejected just because it is not ink on paper. If the signature would have been valid in handwritten form, it is equally valid in electronic form.

The ESIGN Act applies to interstate and foreign commerce, which in practice covers the overwhelming majority of business and consumer transactions. It does not require any specific technology. A typed name at the bottom of an email, a finger-drawn signature on a tablet screen, a click-to-accept checkbox, or a cryptographic digital signature can all qualify as electronic signatures under the Act, provided the signer intended to sign.

The Act does include consumer protection provisions. When a business uses e-signatures with consumers, it must provide clear disclosure that the consumer can consent to electronic records, inform the consumer of the right to receive paper copies, and obtain affirmative consent. These requirements protect consumers from having paper records replaced without their knowledge, but they do not limit the legal validity of the signatures themselves.

State law: UETA

Running parallel to the federal ESIGN Act is the Uniform Electronic Transactions Act (UETA), a model state law drafted by the Uniform Law Commission in 1999. UETA has been adopted by 49 US states and the District of Columbia. The sole holdout is New York, which enacted its own Electronic Signatures and Records Act (ESETA) in 1999, achieving a similar result through different statutory language.

UETA establishes at the state level what ESIGN does at the federal level: an electronic record or signature cannot be denied legal effect solely because it is electronic. The two statutes are designed to complement each other. Where a state has adopted UETA, state law and federal law are consistent. Where a state has not adopted UETA (only New York), the federal ESIGN Act preempts inconsistent state law and provides the baseline rule.

The practical result: in all 50 states and DC, electronic signatures are legally valid. The specific state statute might be UETA, ESETA (New York), or the ESIGN Act acting as federal preemption, but the legal outcome is the same everywhere. There is no US state where a properly executed electronic signature is invalid solely because it is electronic.

In all 50 US states and DC, electronic signatures are legally valid. The specific statute varies, but the outcome does not. This has been settled law since 2000.

European Union: the eIDAS Regulation

In the European Union, electronic signatures are governed by Regulation (EU) No 910/2014, commonly known as the eIDAS Regulation (electronic IDentification, Authentication and trust Services). It came into effect on July 1, 2016, replacing the earlier Electronic Signatures Directive (1999/93/EC).

Unlike the US approach, which treats all electronic signatures as a single category, eIDAS defines three tiers with increasing levels of legal assurance:

• Simple electronic signature (SES) — any data in electronic form attached to or logically associated with other data used by the signatory to sign. This includes typed names, scanned handwritten signatures, checkbox consent, or a finger-drawn signature on a phone. A simple electronic signature cannot be denied legal effect solely because it is electronic, but it is the lowest tier of assurance.
• Advanced electronic signature (AES) — must be uniquely linked to the signatory, capable of identifying the signatory, created using data under the signatory's sole control, and linked to the signed data in a way that any subsequent change is detectable. In practice, this typically means a cryptographic signature with identity verification.
• Qualified electronic signature (QES) — an advanced electronic signature created by a qualified electronic signature creation device and based on a qualified certificate issued by a trust service provider listed on an EU Member State's trusted list. A QES has the legal equivalent of a handwritten signature in all EU member states. It is the only tier that carries automatic cross-border recognition across the EU.

For most everyday business contracts, a simple electronic signature under eIDAS is sufficient and legally valid. The higher tiers become relevant for government filings, regulated transactions, and situations where the identity of the signer needs to be provable to a higher standard. Most people signing a freelance contract, a lease, or a purchase agreement will never need a qualified electronic signature.

United Kingdom

The UK recognized electronic signatures under the Electronic Communications Act 2000, which predates eIDAS. After Brexit, the UK retained the eIDAS framework through domestic legislation (the UK eIDAS regulation), so the three-tier structure of simple, advanced, and qualified electronic signatures still applies in the UK. English courts have consistently upheld electronic signatures, including in the landmark 2019 case Neocleous v Rees, where a name automatically appended to an email was held to satisfy the signature requirement for a property transaction.

The Law Commission of England and Wales published a detailed report in 2019 confirming that electronic signatures are valid under English law for virtually all documents, including deeds, provided the formality requirements are met. The position is clear and well-established.

What makes an e-signature valid

Across all of these legal frameworks, the requirements for a valid electronic signature share common elements:

• Intent to sign — the signer must have intended to sign the document. This is the same requirement as for a handwritten signature. Accidental clicks or forged electronic signatures are not valid for the same reason accidental or forged ink signatures are not valid.
• Consent to do business electronically — particularly in consumer transactions under the ESIGN Act, the parties must agree to conduct the transaction electronically.
• Association with the record — the electronic signature must be connected to or logically associated with the document being signed. A standalone signature file that is not linked to any document does not satisfy this.
• Record retention — the signed electronic record must be capable of being retained and accurately reproduced. If the record is stored in a format that degrades or becomes inaccessible, it may not satisfy retention requirements.

None of these requirements specify a particular technology. You do not need a specific e-signature vendor, a digital certificate, or biometric verification to create a legally binding electronic signature under the ESIGN Act or UETA. Those technologies can add evidentiary weight — they make it easier to prove who signed and when — but they are not prerequisites for legal validity.

This is why signing a PDF on your iPhone with a finger-drawn signature — whether in ScanLens or any other signing app — is legally valid for most purposes. The intent is clear (you opened the document, drew your signature, and sent it), the signature is associated with the document, and the signed file can be retained. That satisfies the statute.

The exceptions: where e-signatures do not work

Both the ESIGN Act and UETA explicitly carve out certain categories of documents from their scope. These exceptions are narrow, but they matter. An electronic signature is generally not valid for:

• Wills, codicils, and testamentary trusts — in most US states, wills must be signed in ink and witnessed in person. A handful of states (including Nevada, Arizona, Indiana, and Florida) have enacted laws allowing electronic wills under specific conditions, but this is the exception, not the rule. If you are drafting a will, use pen and paper unless your state explicitly allows otherwise.
• Documents governed by the Uniform Commercial Code (UCC) — specifically, certain provisions of UCC Articles 1-9 other than Sections 1-107 and 1-206. In practice, this affects negotiable instruments, letters of credit, and certain secured transactions. Ordinary purchase contracts and service agreements are not affected.
• Court orders and notices — certain court orders, notices of default, notices of acceleration, notices of eviction, and notices of foreclosure are excluded from the ESIGN Act in some jurisdictions. Family law documents (adoption, divorce) may also require wet signatures depending on state law.
• Notices of cancellation of utility services or health/life insurance — the ESIGN Act specifically excludes these to protect consumers from having essential services canceled via electronic notice they might not see.
• Documents requiring notarization — traditionally, notarized documents required in-person appearance before a notary public. However, many states have now enacted Remote Online Notarization (RON) laws that allow notarization via video conference with identity verification. As of 2026, most US states authorize some form of remote notarization, but the specific rules vary significantly.

For everything else — employment contracts, NDAs, service agreements, lease agreements (in most states), purchase orders, invoices, consent forms, independent contractor agreements — electronic signatures are fully valid and legally binding.

The exceptions to e-signature validity are narrow: wills in most states, certain UCC instruments, specific court orders, and a few consumer-protection categories. For ordinary business and personal contracts, e-signatures have full legal standing.

Evidentiary strength: why how you sign matters

Legal validity and evidentiary strength are different things. An e-signature on a PDF is legally valid, but if the other party disputes that they signed it, you need evidence to prove they did. This is where the method of signing becomes relevant, not for validity, but for enforceability in a dispute.

Factors that strengthen the evidentiary value of an e-signature:

• Audit trail — a record of when the document was sent, opened, and signed, including IP addresses and timestamps
• Email verification — confirmation that the signer accessed the document through a verified email address
• Identity verification — government ID checks, knowledge-based authentication, or multi-factor authentication before signing
• Tamper-evident seals — cryptographic hashing that proves the document has not been modified after signing
• Certificate-based signatures — digital certificates that cryptographically bind the signer's identity to the document

For a routine freelance contract or a simple NDA, a basic e-signature with an email trail is usually more than sufficient. For high-value transactions, regulated industries, or situations where disputes are likely, investing in stronger authentication makes practical sense. The law does not require it, but the courtroom might reward it.

ScanLens includes built-in e-signature tools that let you sign and annotate PDFs directly on your iPhone with document security features designed to keep your signed documents safe. For most personal and small business use cases, this is all you need.

Common misconceptions

A few things people frequently get wrong about e-signature law:

"E-signatures are not valid for real estate." False in most jurisdictions. The ESIGN Act and UETA apply to real estate contracts, including purchase agreements and leases. The caveat is that deeds and mortgage documents often require notarization, which is a separate requirement (though remote notarization is increasingly available).

"You need a special e-signature service for it to be legal." No. The law does not require any specific technology or vendor. A signature drawn on a phone screen in ScanLens or a typed name with a declaration of intent can be legally binding. Dedicated services add convenience and evidentiary features, but they are not a legal requirement.

"E-signatures are only valid if both parties agree to use them." Partially true for consumer transactions under the ESIGN Act. But in B2B transactions, consent is generally implied when both parties participate in an electronic signing process.

Practical recommendations

If you regularly sign or collect signatures on documents, here is what actually matters from a legal standpoint:

1. Use electronic signatures with confidence for standard business and personal documents — contracts, agreements, consent forms, authorizations
2. Keep a copy of every signed document in a format that preserves the signature and can be reproduced years later (PDF is the standard)
3. For important contracts, maintain some record of the signing process — even a simple email chain showing when the document was sent and returned
4. Check the exceptions before using e-signatures for wills, certain court filings, or documents that require notarization
5. For cross-border transactions, confirm that electronic signatures are valid under the governing law of the contract

For signing documents on the go, ScanLens lets you sign PDFs directly on your iPhone — scan a document, add your signature, and share the signed copy in seconds. No account required, no documents uploaded to third-party servers.

This post is for informational purposes only and does not constitute legal advice. For questions about specific transactions or jurisdictions, consult a qualified attorney.

Related reading

If this post is useful, you may also find these helpful:

• Are Digital Receipts Accepted by the IRS? A 2026 Guide — the legal basis for digital records in US tax recordkeeping
• Which Documents Should You Keep as Paper Originals? — the exceptions where paper still matters
• Is CamScanner Safe? — security and privacy considerations when choosing a document scanner