How do Electronic Signatures work? What you need to know in 2025

An electronic signature is a digital solution that allows you to sign documents quickly and securely online, regardless of your location. Although many people have heard of it, questions remain: how does it work? Is it legally valid? What are the differences between signature types, and how do you choose the right one?

With more services moving online in 2025, the electronic signature is becoming an essential tool for both individuals and businesses. This article covers what an electronic signature is, how it works, which type to choose, and what to consider when using one.

What Is an Electronic Signature?

An electronic signature is a digital way to verify document authenticity, sign contracts, or submit official applications online. Its main purpose is to ensure the document is signed by the person who claims that identity.

Legal Status of Electronic Signatures

Under the EU eIDAS regulation, electronic signatures are legally recognized in all EU countries. However, different types of signatures have different legal powers, so understanding their distinctions is important.

Types of Electronic Signatures:

• Simple Electronic Signature (SES): The most basic type, used in everyday situations, such as a scanned signature in a PDF or a typed name in an email. These are not directly linked to the signer’s identity, making authenticity harder to prove in disputes.

• Advanced Electronic Signature (AES): Offers a higher security level, identifies the signer, and links the signature inseparably to the document. For example, identity confirmation via SMS code or clicking an “I agree” button.

• Qualified Electronic Signature (QES): The highest security level, legally equivalent to a handwritten signature. Created using a qualified signature creation device and based on a certificate issued by a trusted service provider. In Lithuania, an example is the Mobile Signature. QES is required for signing certain official documents (e.g., notarial acts, legal obligations).

How Does an Electronic Signature Work?

Despite the complex technology behind it, the process is simple and user-friendly:

1. Identity Confirmation: Through Smart ID, Mobile Signature, or LT ID.
2. Document Linking: The system assigns a unique digital signature to a specific document, legally equating it to a handwritten one.
3. Data Protection: Once signed, any document change invalidates the signature.

ZebraSign Biometric Handwritten Signature

If you want full e-signature functionality, choose ZebraSign’s biometric handwritten signature or one with a qualified timestamp. It records biometric data, including coordinates, speed, time, and pressure, for authenticity, in compliance with ISO/IEC 19794-7:2021 standards, making it suitable for expert analysis in court.

Pros and Cons of Electronic Signatures:

Pros:

• Speed: Sign in seconds from anywhere.

• Security: Advanced encryption and two-factor authentication.

• Convenience: Fully digital – no printing or scanning.

• EU Recognition: Qualified signatures are legally equal to handwritten ones across the EU.

Cons:

• Technical Requirements: May need specific devices, apps, or internet.

• Limited Validity: Certificates are typically valid up to 5 years.

• Device Dependence: Changing devices may require reconfiguration.

Despite limitations, e-signatures are becoming indispensable in modern life – especially for those valuing speed and security.

In summary

Choosing the right solution for your needs can simplify both daily and business documentation. Despite some technical requirements, it’s an effective way to operate in the digital environment. Try ZebraSign – signing documents has never been easier!

Interested in learning more? Visit zebrasign.com or get in touch for a consultation – we’ll help you digitalise your document signing processes.