ZertES vs eIDAS: What are the key differences for Swiss companies?

The main difference is jurisdiction: eIDAS applies in the European Union, while ZertES is the Swiss legal framework for electronic signatures. For Swiss companies, an eIDAS-compliant signature may not be enough. To ensure legal certainty in Switzerland, qualified electronic signatures must meet ZertES requirements.

ZertES vs eIDAS: legal comparison

At first glance, ZertES and eIDAS look similar. Both define electronic signatures and both recognize qualified electronic signatures as legally equivalent to handwritten signatures.

However, for companies operating in Switzerland, the practical differences are important.

Criteria	ZertES (Switzerland)	eIDAS (European Union)
Legal framework	National law	EU regulation
Equivalent to handwritten signature	Yes Yes	Yes Yes
Cross-border recognition	No Limited	Yes Within EU
Use in Switzerland	Yes Compliant	Conditional Not always sufficient

The key difference: recognition and jurisdiction

The main difference between ZertES and eIDAS is where each framework applies.

eIDAS governs electronic signatures in the European Union. ZertES governs electronic signatures in Switzerland.

This means that a qualified electronic signature issued under eIDAS is valid within the EU, but it is not automatically recognized as ZertES-compliant under Swiss law.

What this means for Swiss companies

For companies operating in Switzerland, this distinction matters. Using an EU-based electronic signature solution may not be sufficient for Swiss legal requirements.

In practice, Swiss companies should check whether their signature provider supports ZertES-compliant qualified electronic signatures, especially for documents that require strong legal validity in Switzerland.

Common misconception

A frequent misconception is: “If a signature is eIDAS-compliant, it is valid everywhere.”

This is not always true. ZertES and eIDAS are separate legal frameworks. They share similar principles, but they are not interchangeable.

Choosing the right electronic signature framework

For organisations working across Switzerland and the EU, the safest approach is to evaluate the legal requirements of each jurisdiction.

Companies should ensure access to ZertES-compliant qualified electronic signatures when signing documents governed by Swiss law, and eIDAS-compliant signatures when operating under EU requirements.

eIDAS in Switzerland: Is it enough?

If there is one key takeaway from the comparison between ZertES and eIDAS, it is that compliance depends on the jurisdiction in which your documents must be legally recognised.

For Swiss organisations, relying on eIDAS alone may not always be sufficient. Understanding when ZertES applies, and which type of electronic signature is required, is essential to ensure the legal validity of documents governed by Swiss law.

Whether you are signing contracts locally or operating across Switzerland and the EU, having clarity on these requirements helps reduce compliance risks and avoid uncertainty when choosing an electronic signature solution.

If you want a clearer view of the legal requirements, signature types, and available ZertES-compliant solutions, our ZertES practical guide provides a complete starting point for companies looking to implement legally valid electronic signatures in Switzerland.