Electronic Signatures in the EU — eIDAS Regulation Guide

eIDAS stands for Electronic Identification, Authentication and Trust Services. The regulation entered into force on July 1, 2016, replacing the earlier Electronic Signatures Directive (1999/93/EC). Unlike a directive, which requires each member state to transpose it into national law, eIDAS is a regulation — it applies directly and uniformly across all 27 EU member states plus Iceland, Liechtenstein, and Norway through the EEA agreement.

The core purpose of eIDAS is to establish a predictable legal environment for electronic transactions within the European Single Market. Article 25(1) contains the foundational principle: an electronic signature shall not be denied legal effect and admissibility as evidence in legal proceedings solely on the grounds that it is in electronic form. This means that any electronic signature — including a simple signature created with SigPDF — has legal standing in every EU member state.

The Three Levels of Electronic Signatures Under eIDAS

eIDAS defines three distinct levels of electronic signatures, each with increasing assurance and legal weight. Understanding these levels is essential for choosing the right type of signature for your document.

1. Simple Electronic Signature (SES)

A Simple Electronic Signature is the broadest category. It includes any data in electronic form that is attached to or logically associated with other electronic data and that is used by the signatory to sign. This encompasses typed names, drawn signatures on a touchscreen, scanned handwritten signatures, and even a checkbox indicating agreement.

Under Article 25(1), a SES cannot be refused legal effect solely because it is electronic. In practice, the vast majority of everyday business documents — contracts, agreements, invoices, purchase orders, HR paperwork, and correspondence — are validly signed with a simple electronic signature. SigPDF creates simple electronic signatures that satisfy this standard.

2. Advanced Electronic Signature (AES)

An Advanced Electronic Signature must meet four additional requirements defined in Article 26 of eIDAS:

• It is uniquely linked to the signatory
• It is capable of identifying the signatory
• It is created using electronic signature creation data that the signatory can, with a high level of confidence, use under their sole control
• It is linked to the data signed in such a way that any subsequent change in the data is detectable

AES is typically implemented through cryptographic digital certificates. It provides a higher level of assurance about the identity of the signer and the integrity of the document. Some industries and regulatory contexts recommend or require AES for certain document types, particularly in banking, insurance, and public procurement.

3. Qualified Electronic Signature (QES)

A Qualified Electronic Signature is the highest level defined by eIDAS. It is an advanced electronic signature created by a qualified electronic signature creation device (QSCD) and based on a qualified certificate issued by a trust service provider listed on an EU member state's trusted list.

Under Article 25(2), a QES has the legal equivalent of a handwritten signature. It is the only type of electronic signature that eIDAS explicitly equates to a wet-ink signature in all member states. QES is required in relatively few situations — certain real estate transactions, some public administration filings, and specific regulated industry submissions. For most private-sector and commercial use cases, a SES or AES is sufficient.

Mutual Recognition Across the EU

One of the most powerful aspects of eIDAS is the principle of mutual recognition. A qualified electronic signature issued in France is legally equivalent to one issued in Germany, Spain, Italy, or any other member state. This eliminates the fragmentation that existed under the old Electronic Signatures Directive, where cross-border recognition was inconsistent.

For simple electronic signatures, the principle is equally important: no EU member state can refuse to accept a document solely because it was signed with a simple electronic signature. Whether you sign a contract in Berlin and send it to a counterparty in Madrid, or sign an invoice in Amsterdam for a client in Rome, your SigPDF signature is legally valid across the entire EU.

When Is Each Signature Level Needed?

• SES (Simple Electronic Signature) — Suitable for the vast majority of business documents: contracts, proposals, invoices, purchase orders, NDAs, employment agreements, freelance agreements, and general correspondence. No special hardware or certificates required.
• AES (Advanced Electronic Signature) — Recommended for higher-value transactions, regulated industries, and situations where stronger proof of signer identity is desired. Often used in banking, insurance, and public procurement.
• QES (Qualified Electronic Signature) — Required for specific legal acts where national law demands the equivalent of a handwritten signature. Examples include certain real estate transactions in some member states, some public-sector filings, and specific regulated submissions.

How SigPDF Works Under eIDAS

SigPDF creates simple electronic signatures (SES) — the most widely used and broadly accepted level under eIDAS. When you draw, type, or upload your signature using SigPDF, it is permanently embedded in the PDF document, logically associated with the signed content, and created with your clear intent to sign. This satisfies the eIDAS definition of an electronic signature under Article 3(10) and is protected by the non-discrimination principle of Article 25(1).

SigPDF processes your PDF entirely inside your browser. Your document never leaves your device — there are no server uploads, no third-party storage, and no cloud processing. This client-side architecture provides exceptional privacy, which is particularly relevant under the EU's General Data Protection Regulation (GDPR). Because your documents are never transmitted to external servers, there is no data processing to worry about and no risk of unauthorized access.

At €2.99/month with unlimited signatures, SigPDF is a fraction of the cost of enterprise e-signature platforms. There are no per-document fees, no envelope limits, and no complex pricing tiers. You get one simple plan that covers all your everyday signing needs.

Sign a PDF in Under a Minute

1. Open your PDF in SigPDF — click “Choose File” or drag and drop
2. Create your signature by drawing, typing, or uploading an image
3. Place your signature on the document where needed
4. Download the signed PDF — your signature is permanently embedded

Summary

Electronic signatures are fully legal across the European Union under the eIDAS Regulation. For the overwhelming majority of business and personal documents, a simple electronic signature is all you need — and that is exactly what SigPDF provides. Your documents stay private, your signatures are legally valid in all EU member states, and the entire process takes less than a minute.