Legal framework in Portugal
The eIDAS Regulation (EU) 910/2014 and Decree-Law 12/2021 govern electronic signatures. The qualified signature has evidentiary value equivalent to a document with a notary-recognized signature, under article 376 of the Civil Code.
Legal framework
eIDAS and Decree-Law 12/2021
How the legal framework evolved in Portugal
1999
Decree-Law 290-D/99: Portugal regulates electronic documents and digital signatures early on.
2016
eIDAS becomes fully applicable across the EU.
2021
Decree-Law 12/2021 aligns Portuguese law with eIDAS and consolidates the Chave Móvel Digital.
2024
eIDAS 2 prepares the European Digital Identity Wallet, rolling out during 2026.
Types of electronic signature in Portugal
Simple electronic signature
Valid under eIDAS and Decree-Law 12/2021. Its evidentiary force rests on process evidence — Firmiu's audit trail.
Advanced electronic signature
Uniquely linked to the signer and able to detect alterations. The usual standard for commercial contracts.
Qualified electronic signature
Equals a handwritten signature across the EU. In Portugal it's very accessible: the Chave Móvel Digital and the Citizen Card allow qualified signing from a phone.
What makes a signature valid in Portugal?
For most private agreements a simple or advanced signature is enough; the qualified one grants maximum evidentiary value. Firmiu accompanies every signature with its audit trail.
Which documents can you sign in Portugal?
Can be signed electronically
- Service agreements
- Lease agreements
- Employment contracts
- Non-disclosure agreements (NDAs)
- Estimates and purchase orders
- Private corporate documents
Usually require a notary or handwritten signature
- Real-estate sales (they require a public deed or authenticated private document)
- Wills
- Notarial acts
- Civil-status acts
These lists are indicative: the document type and applicable law determine each case.
How to sign documents in Portugal
Upload your PDF
Upload the document and enter the name and email of the person who must sign.
The signer receives a link
They get an email with a unique link and a verification code.
Signed document
The PDF is signed with its audit trail, ready to download.
Frequently asked questions
- Are electronic signatures legal in Portugal?
- Yes. eIDAS and Decree-Law 12/2021 grant them full validity.
- Does the qualified signature count like before a notary?
- In evidentiary terms, it equals a notary-recognized signature (Civil Code art. 376).
- Do they work across the EU?
- Yes, eIDAS guarantees recognition in all member states.
- What is the Chave Móvel Digital?
- Portugal's public system for identity and qualified signing from a phone. Useful for government procedures; for commercial contracts, Firmiu's audited electronic signature handles the full flow.
- Can leases be signed electronically in Portugal?
- Yes. Lease contracts are executed in writing and an electronic signature satisfies that; keep the audit trail as evidence.
- Does Finanças require electronic signatures on my contracts?
- No. Tax procedures use the Finanças portal authentication; private contracts don't require it.
- Is an online-signed contract valid before Portuguese courts?
- Yes. Article 25 of eIDAS prevents rejecting it for being electronic, and audit evidence supports its probative force.
Official sources
The information on this page is general in nature and does not constitute legal advice. The validity of an electronic signature depends on the applicable legislation and the document type; for specific cases, consult a legal professional.
Guide reviewed and updated: July 2026.
Electronic signatures by profession
Guides for the industries that sign the most documents in Portugal.
Related guides
Are electronic signatures legal? What you need to know
Electronic signatures are legal across Latin America, Spain and the United States. Here's what makes them valid and where they're recognized.
Types of electronic signature: simple, advanced and qualified
Not all electronic signatures are the same. Here are the three levels and which one you need for each document.
What documents can you sign electronically
Electronic signatures work for far more documents than you'd think. Here are the most common ones and the exceptions.
Electronic signature in other countries
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