Is an electronic signature legally binding in Switzerland?

Yes, but the legal weight depends on the type. A Simple Electronic Signature (SES) is valid for contracts with no formal requirements. An Advanced Electronic Signature (AES) is acceptable for most commercial contracts. Only a Qualified Electronic Signature (QES) under ZertES Art. 11 has the same legal effect as a handwritten signature and satisfies the written form requirement for contracts where Swiss law mandates it.

Which Swiss contracts require a QES?

Swiss law mandates written form for: non-compete clauses in employment contracts (OR Art. 340), personal guarantee agreements stating the maximum guaranteed amount (OR Art. 493), and certain power of attorney documents. For these, AES does not satisfy the statutory requirement and the contract may be voidable.

What is ZertES and how does it relate to eIDAS?

ZertES (SR 943.03) is Switzerland's Federal Act on Electronic Signatures, governing electronic signature standards for Swiss-qualified signatures. It aligns structurally with the EU's eIDAS Regulation but applies within Swiss jurisdiction. A QES under ZertES Art. 11 has the same legal effect as a handwritten signature in Switzerland. For cross-border EU transactions, eIDAS Art. 25(2) provides the same legal presumption within EU member states.

Does an AES satisfy the written form requirement in Switzerland?

No. The written form requirement (Schriftlichkeit) for contracts such as non-compete clauses and personal guarantees requires equivalence to a handwritten signature. Only a QES under ZertES Art. 11 satisfies this for electronic signatures. An AES provides good identity evidence but does not meet the written form standard.

How can I verify that a Swiss electronic signature is valid?

Open the signed PDF in Adobe Acrobat and check the signature panel. The issuing QTSP must appear on the EU Trusted List (eidas.ec.europa.eu/efda/tl-browser/) or the Swiss BAKOM accreditation list. For documents sealed through Swiss Trust Layer, use validate.swisstrustlayer.com to check the certificate chain, signing time, and document hash without creating an account.

ESignature Law

Une signature electronique est-elle juridiquement contraignante en Suisse?

Philipp Stuppnik · Co-Founder & IP Strategy

9 juillet 2026 8 min de lectureDernière mise à jour 8 septembre 2026

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In short

En Suisse, la reponse depend du type de signature. Seule une SEQ selon ZertES Art. 11 satisfait l'exigence de forme ecrite.

Une signature electronique est-elle juridiquement contraignante en Suisse? — Swiss Trust Layer

La Suisse dispose d'un cadre juridique clair pour les signatures electroniques en vertu de ZertES (RS 943.03). La reponse depend du type de signature et des exigences contractuelles.

Les trois niveaux reconnus par le droit suisse

Signature electronique simple (SES) — valide pour les contrats sans exigence de forme.
Signature electronique avancee (SEA) — convient a la plupart des contrats commerciaux sans exigence de forme ecrite.
Signature electronique qualifiee (SEQ) — seule SEQ a le meme effet juridique qu'une signature manuscrite selon ZertES Art. 11. Requise quand la loi suisse impose la forme ecrite.

Quand la forme ecrite est-elle requise?

Clauses de non-concurrence (CO Art. 340): forme ecrite requise. Une SEQ satisfait cette condition selon ZertES Art. 11.
Cautionnements personnels (CO Art. 493): forme ecrite avec indication du montant maximum. Une SEQ est valable.

Reponse pratique

Pour les contrats sans exigence de forme: la SEA suffit. Pour les contrats necessitant la forme ecrite: seule la SEQ convient.

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Les trois niveaux reconnus par le droit suisse

Quand la forme ecrite est-elle requise?

Reponse pratique

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