Qualified Electronic Signature (QES) in the EU

Businesses: Cross-Border EU Validity? Choose Qualified Electronic Signature (QES)

A Qualified Electronic Signature (QES) is legally equivalent to a handwritten signature throughout the EU and is required for automatic cross-border legal effect.

Forfatter: Ricco (Founder & Head of Security) Opdateret: 2026-08-29 Læsetid: 5-6 min read

Virksomheder: Gyldighed i EU og kvalificeret elektronisk signatur

Hovedpointer (Key Takeaways)

A Qualified Electronic Signature (QES) automatically has the same legal effect as a handwritten signature in all 27 EU member states with statutory presumption of validity.
While Simple (SES) and Advanced (AES/MitID) signatures are ideal for most domestic agreements, cross-border or high-risk contracts benefit from QES.
QES certificates must be issued by a certified Qualified Trust Service Provider (QTSP) on the EU Trusted List.
Modern platforms like KvikSign simplify signature workflows and include Long-Term Validation (LTV) and cryptographic timestamps.

What is a Qualified Electronic Signature (QES)?

A Qualified Electronic Signature (QES) represents the highest tier of electronic signature defined in the EU eIDAS regulation (Article 25(2)).

It is created using a Qualified Signature Creation Device (QSCD) and is based on a qualified certificate issued by a recognized Qualified Trust Service Provider (QTSP).

Difference between SES, AES, and QES in practice

The eIDAS regulation establishes three main categories of electronic signatures:

1. Simple Electronic Signature (SES): E.g., clicking an "Agree" checkbox or drawing a signature on a touch screen.

2. Advanced Electronic Signature (AES): Cryptographically tied to the signer with verified identity (e.g. MitID, BankID).

3. Qualified Electronic Signature (QES): Highest assurance level with statutory presumption of validity across all EU courts.

Ofte stillede spørgsmål (FAQ)

Is MitID considered a Qualified Electronic Signature (QES)?

MitID operates as a recognized Advanced Electronic Signature (AES) under eIDAS with high identity assurance. When paired with a QTSP timestamp and seal, it provides top-tier legal reliability.