Qualified Electronic Signature (QES)
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Definition
A Qualified Electronic Signature is the highest eIDAS signature tier, created with a certified signing device and a qualified certificate from an audited EU trust provider, and it is the only tier automatically equal to a handwritten signature in every EU member state.
QES is the EU's gold-plated signature. Where a simple electronic signature relies on surrounding evidence and an advanced one on signer-controlled keys, a qualified signature adds two regulated ingredients: a qualified certificate issued after identity verification by a government-supervised trust service provider, and a certified qualified signature creation device (QSCD) holding the private key, in hardware or an equivalent certified remote service.
The legal effect
eIDAS Article 25(2) gives QES, and only QES, automatic equivalence to a handwritten signature, plus mutual recognition across all member states. With the lower tiers, a court weighs the evidence; with QES, the burden flips, since the signature is presumed valid and a challenger must prove otherwise.
When you actually need it
Less often than vendors imply. National laws reserve QES for specific document classes: examples include certain consumer-credit agreements, some employment terminations in Germany, selected real-estate and notarial acts, and filings with some public authorities. Cross-border B2B contracts, NDAs, waivers, and intake forms run on simple or advanced signatures everywhere in the EU.
QES and Sign Sail, stated plainly
Sign Sail does not issue qualified signatures, and we'd rather say so than blur it. We capture eIDAS simple electronic signatures with a deep evidence bundle and PAdES-seal the completed PDF. If a specific document legally requires QES, use a qualified trust service provider from the EU trusted list for that document, and keep the routine 95% of your paperwork on a tool priced for it.
↗ · Common questions
How does a signer get a qualified signature?
Through a qualified trust service provider on the EU trusted list: the signer proves identity (in person or via certified remote identification), receives a qualified certificate, and signs using a certified device or the provider's certified remote signing service. It's a per-signer enrollment, which is why QES is reserved for documents that genuinely demand it.
Is QES required for contracts with EU customers?
Not as a rule. Ordinary commercial contracts are valid with simple electronic signatures under eIDAS Article 25(1). QES requirements come from specific national statutes for specific document types. Check whether your document type is on such a list before paying QES prices for everything.
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See it in a real signature.
Every Sign Sail plan, the free one included, captures this evidence on every signature.