Updated September 24, 2026

Is an electronic signature legal in Spain?

Short answer: Yes. Under eIDAS, Ley 6/2020 and article 23 of Ley 34/2002 (LSSI), electronic contracts have full legal effect when consent and the other validity requirements are met, and electronic support satisfies a requirement for written form.

The laws

eIDAS Regulation (EU) No 910/2014, as amended by Regulation (EU) 2024/1183

Directly applicable across the EU. It defines simple, advanced and qualified electronic signatures. Article 25 provides that an electronic signature cannot be denied legal effect or admissibility as evidence solely because it is electronic, and that a qualified electronic signature (QES) has the equivalent legal effect of a handwritten signature.

Ley 6/2020, de 11 de noviembre (electronic trust services)

Supplements eIDAS in Spain and repealed the former Ley 59/2003 on electronic signatures. Article 3 provides that electronic documents have legal value according to their nature and refers to the Civil Procedure Act for the evidential treatment of qualified and non-qualified trust services.

Ley 34/2002 (LSSI), article 23

Electronic contracts are fully effective when consent and the other validity requirements are met. The parties do not need a prior agreement to use electronic means, and a written-form requirement is met by electronic support.

Electronic contracts in Spain

Spanish law treats contracts concluded electronically as fully valid. Under article 23 of the LSSI, where a law requires a contract or information to be in writing, that requirement is met if it is contained on an electronic support.

Evidence matters if a signature is disputed. Ley 6/2020 links the evidential weight of an electronic document to whether a qualified or non-qualified trust service was used, so a qualified signature is easier to prove, while a simple signature relies on supporting evidence such as an audit trail.

What is excluded

Article 23 of the LSSI does not apply to contracts governed by family law and succession law. Contracts that require a public document, or the involvement of a notary, registry or public authority, follow their own specific rules.

Practical tips for businesses in Spain

Everyday business contracts, supplier agreements, NDAs and service contracts can be signed electronically. Keep the signed document with its audit trail as evidence.

eSignSimple provides simple electronic signatures with an audit trail (timestamps, IP addresses and a document hash). It is not a qualified trust service provider and does not issue qualified electronic signatures, so use a QES provider where the law requires one.

This page is general information about how electronic signature law works, not legal advice. For a specific high-value or regulated transaction, check with a qualified lawyer in the relevant jurisdiction.

Documents that need more than a simple e-signature

Family law contracts (LSSI article 23)
Succession law contracts (LSSI article 23)
Contracts that require a public document or the intervention of a notary, registry or public authority, which follow their own specific rules

Official sources

This guide is general information, not legal advice. Laws change and details depend on your situation; consult a qualified lawyer in Spain for specific transactions.

Frequently asked questions

Do both parties need to agree in advance to sign electronically in Spain?

No. Article 23 of the LSSI says no prior agreement between the parties on the use of electronic means is needed for an electronic contract to be valid.

Is Ley 59/2003 still in force?

No. Ley 59/2003 on electronic signatures was repealed by Ley 6/2020, which now supplements the eIDAS Regulation in Spain.

Can I sign a property deed electronically in Spain?

Contracts that require a public document or notarial intervention follow their own specific rules, so a standard e-signature does not replace the notary.

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