Electronically Sign a Contract: Legal Value, Steps, Pitfalls

Electronically signing a contract is now just as legal, recognised and enforceable as a handwritten signature — provided you follow a few simple rules derived from the European eIDAS regulation and the French Civil Code. Whether you're a startup signing your first employment contracts remotely, 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 contract signing is based on three fundamental texts. The European eIDAS regulation (EU No. 910/2014) defines three levels: simple (SES), advanced (AES) and qualified (QES). Article 1367 of the French Civil Code recognises electronic signature as a means of proof equivalent to handwritten signature, provided it identifies the signatory and guarantees the integrity of the document. The law of 13 March 2000 paved the way by introducing electronic signature into French law.

Can All Contracts Be Signed Electronically?

Yes, for the vast majority: employment contracts, temporary contracts, NDAs, commercial agreements, residential and commercial leases, mandates, simple powers of attorney, quotes, purchase orders, general terms and conditions. A few limited exceptions: deeds of private signature relating to family law (marriage contract, civil partnerships, donations) and certain authentic deeds (property sale at a notary's office) which require either a qualified signature (QES) or physical presence. If in 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 contract with low to medium risk (quote, purchase order, standard NDA, certificate): SES level (simple signature by click + email link) is sufficient. For a contract with high risk (employment contract, lease, commercial contract worth five figures or more): prioritise AES with SMS OTP for more robust identification. For a regulated deed (notary, lawyer subject to Article 66-3-3, public contract above the threshold): QES is mandatory.

Step 2: Prepare the Document

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

Step 3: Precisely Identify Signatories

Enter the name AND email of each signatory. Check this information twice: an email error can invalidate the signature if the email belongs to someone other than the person 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 full-screen, accepts the platform's terms of use, then validates (in AES mode, enters their OTP received by SMS). The final PDF includes a digital certificate, SHA-256 fingerprint, certified timestamp, and audit trail listing each action. These 4 elements constitute your enforceable proof — kept for a minimum of 10 years for commercial deeds (Article L. 123-22 of the French Commercial Code).

The 5 Pitfalls to Avoid

Pitfall 1: using a scanned image of 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 €200k/year commercial lease (under-dimensioned, AES minimum). Pitfall 5: deleting the audit trail after signature (without it, the proof is weakened). Certyneo automatically retains 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 procedure. For QES, it is up to the party contesting to prove non-validity (legal presumption of reliability, Decree 2017-1416).

Sign Your First Contract with Certyneo

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