What makes an e-signature legally binding?

Short answer

For most everyday business contracts in the United States and the European Union, a properly captured electronic signature can be as legally effective as a handwritten ("wet ink") signature. The key is not the visual scribble on the PDF — it is intent to sign, association of the signature with the record, and a reliable way to show who signed what, and when.

Doxufy is designed around those requirements: consent to do business electronically, a clear signing experience, and a Certificate of Completion with timestamps, IP/device context, and a SHA-256 document fingerprint. Doxufy is not a law firm and this article is not legal advice — always confirm requirements for your document type and jurisdiction.

United States: ESIGN and UETA

Two frameworks matter most in the U.S. The Electronic Signatures in Global and National Commerce Act (ESIGN) is a federal law that generally gives electronic signatures and records the same legal effect as paper ones for transactions in or affecting interstate commerce. The Uniform Electronic Transactions Act (UETA) is a model state law adopted (in whole or in substance) by nearly every state. Together, they establish that a signature may not be denied legal effect solely because it is electronic.

In practice, courts and businesses look for evidence that: (1) the parties agreed to conduct the transaction electronically; (2) the signer intended to sign; (3) the signature is logically associated with the record; and (4) the record can be retained and accurately reproduced. Consumer-facing transactions often also require clear disclosures and a way to access the signed copy.

European Union: eIDAS

In the EU, Regulation (EU) No 910/2014 (eIDAS) defines electronic signatures and related trust services. It recognizes simple electronic signatures, advanced electronic signatures (AdES), and qualified electronic signatures (QES). A qualified electronic signature has the equivalent legal effect of a handwritten signature across member states, but many commercial agreements can still rely on other forms of e-signature depending on local law and risk tolerance.

If you operate across the EU, map your document types to the assurance level your counsel recommends — especially for regulated industries or high-value contracts.

What a strong audit trail usually includes

Regardless of jurisdiction, enforceability arguments are stronger when you can show a tamper-evident history of the signing event. Typical evidence includes:

• Unique signer identity and email delivery of a secure signing link
• Timestamps for view, sign, and complete events
• IP address and user-agent / device context
• A cryptographic fingerprint (hash) of the final document
• A downloadable Certificate of Completion shared with all parties

When wet ink (or extra formality) may still be required

Electronic signatures are not universal. Depending on jurisdiction, wills and testamentary documents, certain family-law filings, some real-estate deeds or notarizations, and other regulated instruments may still require wet ink, a notary, or a specific trust-service level. When in doubt, ask counsel before relying on e-sign for that document type.

How Doxufy approaches compliance

Doxufy supports electronic signatures under ESIGN, UETA, and eIDAS for typical business use cases. Completed packages include a Certificate of Completion and a SHA-256 fingerprint so parties can detect post-signature tampering. Signers do not need an account — they open a secure link, review the PDF, complete fields, and submit.

Ready to try it? Start on the free plan (3 documents per month) or compare options on /pricing. For a deeper product overview, see /electronic-signature-software.