Electronic Signature Validity: Legal Value 2026, eIDAS, Civil Code

The validity of electronic signature in France has been legally established since the law of March 13, 2000, which introduced into the Civil Code article 1366 (equivalence between electronic and paper writing) and article 1367 (equivalence between compliant electronic signature and handwritten signature). The European eIDAS regulation, applicable since 2016 and strengthened by eIDAS 2.0 in 2024, confirms and harmonizes this framework across all Member States. No French case law has challenged this validity since then — labor councils, district courts and courts of appeal unanimously accept electronic signature as evidence, provided that four conditions are met. Here is how they work in practice.

Legal validity in a nutshell

Electronic signature is legally valid in France and throughout the European Union since 2000 (French law) and 2016 (eIDAS regulation). Its evidentiary force depends on the level of signature chosen and the quality of evidence preserved.

The legal trinity to remember

Three texts structure legal validity in France:

• Article 1366 of the Civil Code: electronic writing has the same evidentiary force as paper writing.

• Article 1367 of the Civil Code: electronic signature rests on a reliable identification process guaranteeing its connection to the act.

• European eIDAS Regulation (No. 910/2014): creates the three levels (SES, AES, QES) and the principle of non-discrimination.

The three conditions of validity

For a signature to be valid, it must satisfy three cumulative conditions:

• Identification of the signatory: it must be possible to establish who signed

• Integrity of the document: no modifications must have been made after signing

• Informed consent: the signatory must have been able to review the content

Evidentiary force by level

For a qualified signature, the burden of proof is reversed: it is up to the signatory who contests to prove fraud. For SES/AES, the audit trail of the platform carries significant weight in the decision.

See the 3 levels in detail.

Covered documents

Nearly all contractual documents: employment contracts, leases, mandates, agreements, NDAs, quotes, purchase orders, powers of attorney, memberships. Exclusions: certain authentic acts (notary), civil status records, holographic wills.

How to preserve evidence

Preserve the signed PDF in PAdES format, the complete audit trail (IP, timestamp, authentication), qualified timestamps and respect the legal retention period (10 years for commercial contracts). See preservation of signed documents.

Mistakes to avoid

• Scanning a handwritten signature and pasting it on a PDF: this is not an eIDAS electronic signature

• Using a non-compliant tool: verify that the service provider complies with eIDAS

• Losing the audit trail: without it, the evidence is weakened

• Choosing an inappropriate level: SES for a €50,000 employment contract is undersized

Concrete case: disputed commercial contract

An SME sends a €30,000 contract signed in AES. Six months later, the customer disputes it. The platform produces the precise timestamp, IP address, OTP log and document fingerprint. The commercial court considers these elements sufficient: the dispute is rejected.

How Certyneo helps you

Certyneo issues all its signatures in PAdES format with complete audit trail, timestamp and 10-year archiving by default. You choose the level (SES or AES) document by document.

Discover the Certyneo electronic signature solution

FAQ

Can a court refuse a simple signature?

No, not on the ground that it is simple. The judge assesses the reliability of the process.

What is the difference between validity and evidentiary force?

Validity is the recognized legal character. Evidentiary force is the weight of evidence before a court.

Do you need a notary?

No, except for authentic acts.

How long to keep?

10 years for commercial contracts. 5 years after end for employment contracts.

Is a foreign signature valid in France?

Within the EU: yes, mutual recognition under eIDAS.

Conclusion

The legal validity of electronic signature is no longer debatable in 2026. The real issue is the rigor of the process.

Try Certyneo to send, sign and track your documents online simply, quickly and securely.