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

The validity of electronic signature in France has been legally established since the law of 13 March 2000, 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 — employment tribunals, 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

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

The Three-Part Legal Framework to Remember

Three texts structure legal validity in France:

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

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

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

The Three Conditions for 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 signature

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

Probative Force 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 audit trail of the platform 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 notarial deeds, civil status records, handwritten wills.

How to Preserve Evidence

Keep the signed PDF in PAdES format, the complete audit trail (IP, timestamp, authentication), qualified timestamps and respect the legal duration (10 years for commercial contracts). See preservation 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: check 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 objects. The platform produces the precise timestamp, IP address, OTP log and document fingerprint. The commercial court considers these elements sufficient: the objection 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 Certyneo's 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 process.

What is the Difference Between Validity and Probative Force?

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

Do You Need a Notary?

No, except for notarial deeds.

How Long Should You Keep It?

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 under eIDAS.

Conclusion

The legal validity of electronic signature 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.