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

The validity of electronic signatures in France has been legally established since the 13 March 2000 law, which introduced into the Civil Code article 1366 (equivalence between electronic writing and paper) 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 harmonises this framework across all Member States. No French case law has challenged this validity since then — labour councils, district courts and courts of appeal unanimously accept electronic signatures 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 probative value depends on the signature level chosen and the quality of evidence retained.

The legal triptych to remember

Three pieces of legislation structure legal validity in France:

• Article 1366 of the Civil Code: electronic writing has the same probative value as paper writing.

• Article 1367 of the Civil Code: electronic signature is based on a reliable identification procedure guaranteeing its link with the document.

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

The three conditions for validity

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

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

• Document integrity: no modifications must have been made after signature

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

Probative value by level

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

See the 3 levels in detail.

Documents covered

Almost all contractual documents: employment contracts, leases, mandates, agreements, NDAs, quotations, purchase orders, powers of attorney, memberships. Exclusions: certain authentic instruments (notarial), civil status documents, holographic wills.

How to preserve evidence

Retain 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 retention of signed documents.

Mistakes to avoid

• Scanning a handwritten signature and pasting it onto 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 under-sized

Real-world case: contested commercial contract

An SME sends a 30,000 € contract signed in AES. Six months later, the client 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 grounds that it is simple. The judge assesses the reliability of the procedure.

What is the difference between validity and probative value?

Validity is the recognised legal character. Probative value is the weight of evidence before a court.

Do I need a notary?

No, except for authentic instruments.

How long should I retain?

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

Is a foreign signature valid in France?

Within the EU: yes, mutual recognition of eIDAS.

Conclusion

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

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