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.

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在瑞士电子签名具有法律约束力吗？

在瑞士，答案取决于所用签名类型。只有符合 ZertES 第11条的 QES 才能满足瑞士法律要求书面形式的合同签署需求。

Philipp Stuppnik· Co-Founder & IP Strategy

·2026年7月9日·最后更新 2026年8月21日· 8 分钟阅读

在瑞士，电子签名依据ZertES（SR 943.03）有效。只有ZertES第11条下的合格电子签名（QES）等同于手写签名，满足不竞争条款（OR第340条）和个人担保（OR第493条）等合同的法定书面形式要求。Swiss Trust Layer：每份文件起价CHF 5。验证：validate.swisstrustlayer.com。

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