Short version for a business owner: an offer letter, a vendor contract, a lease addendum or a sales order signed online is as binding as one signed in ink. That question was settled by Congress in 2000. The questions that still lose disputes are different ones: can you show that the right person signed, that they intended to sign this version, and that nobody changed the file afterward?
This page is our reading of the statutes, not legal advice. Where a document is worth a lawsuit, have counsel confirm the rule for your state and document type.
What the federal law actually says
Section 101 of the ESIGN Act (15 U.S.C. 7001) makes two promises for transactions in interstate or foreign commerce. A signature, contract or other record "may not be denied legal effect" solely because it is in electronic form, and a contract cannot be denied effect solely because an electronic signature or record was used to form it.
Three limits sit right next to that promise, and they are where most real problems start:
- Nobody is forced to sign electronically. The law does not require any person to agree to use electronic records or signatures, government agencies aside. If the other party wants paper, the statute does not override them.
- Consumers get a consent step. When another law requires that information be given to a consumer in writing, an electronic copy counts only if the consumer affirmatively consented, received a clear statement first (right to paper, right to withdraw, scope of the consent, how to get a paper copy) and consented in a way that reasonably demonstrates they can open the format you will use.
- The record has to survive. An electronic record can be refused effect if it cannot be retained and accurately reproduced for later reference by everyone entitled to keep it.
The documents the statute excludes
Section 103 (15 U.S.C. 7003) carves out documents where an e-signature does not get the ESIGN guarantee:
| Excluded by ESIGN | What it means for a small business |
|---|---|
| Wills, codicils and testamentary trusts | Estate documents follow state probate law, not your signing tool |
| Adoption, divorce and other family-law matters | Use the court's or state's own process |
| Most of the Uniform Commercial Code (except sections 1-107 and 1-206 and Articles 2 and 2A) | Sales of goods and leases are covered; negotiable instruments and secured-transaction papers need a closer look |
| Court orders, notices and official court documents | Pleadings follow court e-filing rules |
| Notices of utility shutoff; default, foreclosure, eviction or repossession on a primary residence; cancellation of health or life insurance; recalls that endanger health or safety | Landlords, lenders and insurers should not rely on an e-signed or emailed notice alone |
| Documents that must travel with hazardous materials | Shipping papers follow their own transport rules |
If a document is not on this list and is an ordinary commercial agreement, the electronic form is not the weak point.
State law: one model act, one exception
States write their own rules for transactions inside their borders. The model is the Uniform Electronic Transactions Act (UETA), and California's enactment shows what an adopted version looks like, exclusions included. According to a January 16, 2026 committee report of the New York City Bar Association, New York is the only state that has not adopted UETA; it relies on its Electronic Signatures and Records Act (ESRA) of 2000.
| Where | Law | Core rule | Watch for |
|---|---|---|---|
| Every interstate or foreign transaction | ESIGN Act | No denial of legal effect for electronic form | Consumer consent, retention, statutory exclusions |
| States that adopted UETA (all but New York, per the report above) | That state's UETA enactment | Same principle, plus rules on attribution and retention | Each state's own exclusions and amendments |
| California | Civil Code enactment of UETA | Electronic records and signatures satisfy writing and signature rules | California's listed exclusions |
| New York | ESRA, State Technology Law Article 3 | An e-signature has "the same validity and effect" as a handwritten one unless another law says otherwise (§ 304) | § 307 excludes wills, trusts, powers of attorney and certain title instruments, with carve-outs |
What decides a dispute
When an e-signed contract is challenged, the argument is almost never "electronic signatures don't count." It is "I never signed that" or "that is not the version I agreed to." The evidence that answers those claims is what to buy for:
- Attribution. How the signer was identified: email link only, an access code, a text-message code, ID verification.
- Intent. A deliberate signing action on a document the signer could read in full.
- Integrity. A sealed final file that shows any later change.
- A trail you can export. Timestamps, addresses and events in a form a lawyer can attach to a filing without your vendor login.
Our pick
For a team that may one day need to prove a signature, our pick is Docusign. It is the broadest agreement platform in our ranking, and Docusign's own documentation (for its regulated life-sciences offer) describes a detailed audit trail and a Certificate of Completion; that kind of package is what we would want in hand when a counterparty says "I never signed." Treat it as the vendor's description, and export one sample on your own plan before you rely on it.
Who should skip it: a small team sending a handful of straightforward agreements a month. Dropbox Sign is the approachable alternative we would start with there. Whatever you choose, run one test: sign a document, change a word in the PDF, and see whether the sealed file or the tool's verification, if it offers one, shows the change.
Before you rely on an e-signature
- Check the document against the excluded list above and against your state's enactment.
- If the signer is a consumer and another law requires a written notice, build the ESIGN consent screen before the signature, not after.
- Store the signed file and its trail outside the vendor account, in a place you control.
- For deeds, wills, notarized papers and government forms, read our guide to IRS, USCIS and notarized documents: there the agency or the notary law sets the rule, not the signing tool.
- If someone asks whether typing a name or writing /s/ is enough, see typed names and /s/ signatures; for the state-by-state picture, see electronic signature laws by state.
Traceable evidence
Sources for this decision
- officialElectronic Signatures in Global and National Commerce ActUnited States Congress · checked Aug 5, 2026 · supports: Federal rules for electronic records and signatures in interstate or foreign commerce, including consumer-disclosure requirements and statutory exclusions; not a conclusion that every document or workflow is eligible.Open source ↗
- officialUniform Electronic Transactions ActUniform Law Commission · checked Aug 5, 2026 · supports: Model state-law rules for electronic records and signatures, including attribution, retention and excluded transactions; it does not prove adoption without checking the governing state's enactment and amendments.Open source ↗
- officialCalifornia Uniform Electronic Transactions ActCalifornia Legislative Information · checked Aug 5, 2026 · supports: California's enacted electronic-transactions provisions and exclusions; it supports state-specific legal context, not universal document eligibility or enforceability.Open source ↗
- officialNew York State Technology Law § 304, use of electronic signatures (ESRA)New York State Senate · checked Oct 27, 2026 · supports: New York's Electronic Signatures and Records Act rule that, unless another law provides otherwise, an electronic signature may be used in lieu of a handwritten one with the same validity and effect; it does not decide whether a particular signer, document or process meets the statute or the State's implementing rules.Open source ↗
- officialNew York State Technology Law § 307, documents excluded from ESRANew York State Senate · checked Oct 27, 2026 · supports: The documents New York's ESRA does not cover, such as wills, trusts, powers of attorney and certain negotiable or title instruments, with the listed carve-outs and effective dates; it does not settle how another state's law treats the same document.Open source ↗
- standardsModernizing New York electronic signatures: ESRA and UETA (committee report, January 16, 2026)New York City Bar Association · checked Oct 27, 2026 · supports: A bar association committee report stating that New York is the only state that has not adopted UETA and relies on ESRA, enacted in 2000; it is a professional report, not a statute, and does not change New York law.Open source ↗
- vendorDocusign Life Sciences Modules for 21 CFR Part 11Docusign · checked Oct 27, 2026 · supports: Docusign's description of its Part 11 module (two-factor authentication to access and sign, reason for signing, audit trail and Certificate of Completion) and a separate Validator module; it does not state the edition required or prove a customer's Part 11 compliance.Open source ↗
- vendorDocusign official product siteDocusign · checked Aug 5, 2026 · supports: Vendor-published product scope used to verify capabilities relevant to this buyer context: Organizations evaluating a broad agreement workflow and integration ecosystem. It does not prove the guide's fit verdict, configured performance, current pricing or compliance.Open source ↗
- vendorDropbox Sign official product siteDropbox Sign · checked Aug 5, 2026 · supports: Vendor-published product scope used to verify capabilities relevant to this buyer context: Small and product teams evaluating approachable signing and embedded workflows. It does not prove the guide's fit verdict, configured performance, current pricing or compliance.Open source ↗