Electronically Sign a Contract: Legal Value, Steps, Pitfalls

Electronically signing a contract is now just as legal, recognized, and enforceable as a handwritten signature — provided you follow a few simple rules based on the European eIDAS regulation and the French Civil Code. Whether you're a startup signing your first remote employment contracts, a consulting firm managing international NDAs, or a merchant sending quotes, this guide explains concretely how to electronically sign a contract in 2026, what legal value it produces, and what common pitfalls to avoid.

The Legal Framework in One Minute

Electronic signature of a contract is based on three fundamental texts. The European eIDAS regulation (EU 910/2014) defines three levels: simple (SES), advanced (AES), and qualified (QES). Article 1367 of the French Civil Code recognizes electronic signature as evidence equivalent to a handwritten signature, provided it identifies the signatory and guarantees document integrity. The law of March 13, 2000 paved the way by introducing electronic signature into French law.

Can All Contracts Be Electronically Signed?

Yes for the vast majority: employment contracts (CDI, CDD), NDAs, commercial agreements, residential leases, commercial leases, powers of attorney, simple proxies, quotes, purchase orders, terms and conditions. A few limiting exceptions: private deeds relating to family law (marriage contracts, PACS, donations) and certain authentic acts (real estate sales at a notary's office) that require either a qualified signature (QES) or physical presence. In case of doubt, consult Article 1175 of the Civil Code.

Step 1: Choose the Right Signature Level

The choice depends on the risk associated with the contract. For a low to medium-risk contract (quote, purchase order, standard NDA, attestation): SES level (simple signature by click + email link) is sufficient. For a high-risk contract (employment contract, lease, commercial contract worth five figures or more): opt for AES with SMS OTP for more robust identification. For a regulated act (notary, lawyer subject to Article 66-3-3, public procurement above threshold): QES is mandatory.

Step 2: Prepare the Document

Ensure the contract is finalized (no clauses to negotiate) and in PDF format. Avoid editable formats (Word) sent for signature: any modification after signature invalidates the proof of integrity. Ideal: convert to PDF/A (ISO 19005 format, optimized for archiving) before sending. Certyneo does this automatically upon upload.

Step 3: Precisely Identify the Signatories

Enter the name AND email of each signatory. Double-check this information: an email error can invalidate the signature if the email belongs to a different person than the one named in the contract. For a multi-party contract, activate sequential mode (one signature after another, each signatory sees previous signatures) rather than parallel, unless the signatories are completely independent. The audit trail will document the chronological order.

Step 4: Signature and Proof

Each signatory receives an email with a personal link, views the document in full screen, accepts the platform's terms of use, then validates (in AES mode, enters their OTP received by SMS). The final PDF incorporates a digital certificate, a SHA-256 fingerprint, a certified timestamp, and an audit trail listing each action. These 4 elements constitute your enforceable proof — preserved for a minimum of 10 years for commercial acts (Article L. 123-22 of the Commercial Code).

The 5 Pitfalls to Avoid

Pitfall 1: using a scanned image of a signature (no value). Pitfall 2: sending a Word document instead of a PDF (editable afterwards). Pitfall 3: not verifying the signatory's email (risk of receipt by a third party). Pitfall 4: choosing SES level for a commercial lease at 200k€/year (under-sized, AES minimum). Pitfall 5: deleting the audit trail after signature (without it, the proof is weakened). Certyneo automatically preserves all proof elements for 10 years.

Enforceability in Case of Dispute

A contract signed electronically at AES or QES level is accepted by French and European courts. In case of dispute, the party relying on it must produce: the signed PDF, the audit trail (separate PDF certificate), metadata (IP, timestamp, user agent). The judge assesses the reliability of the process. For QES, it is up to the party contesting to prove invalidity (legal presumption of reliability, decree 2017-1416).

Sign Your First Contract with Certyneo

Create a free account on certyneo.com/signup, upload your contract, add the signatories and send. You get a signed, compliant, enforceable and archived contract in minutes. For an employment contract, consult our dedicated guide (/blog/signer-contrat-travail-electroniquement). To understand the legal value comparison between electronic and handwritten signature, see our article (/blog/signature-electronique-vs-manuscrite-valeur-juridique).