eIDAS, DL 290-D/99
GNS/CNCS
EUR
Yes, electronic signatures are generally legally valid in Portugal under eIDAS, DL 290-D/99 and sufficient for most contract types without a form requirement. canusign uses the simple electronic signature (SES); for documents with a statutory written-form or notarial requirement it is not sufficient.
In Portugal, you can digitally sign most contracts, including: Commercial contracts, Employment contracts, Rental agreements. Exceptions are: Real estate transactions (notary), Public deeds.
The responsible authority in Portugal is GNS/CNCS. They oversee compliance with legal requirements for electronic signatures.