Can I apply for the D4 student visa from abroad?

Short answer: Yes — D4 covers degree, exchange, or research programs of at least 12 months with a Portuguese institution acceptance letter.

The D4 requires a formal admission letter, subsistence proof (any of: scholarship letter, parental affidavit + sponsor income proof, or ≥ €6,100 in savings), accommodation, and parental authorisation if the applicant is under 18. The visa is study-period bound — you can convert to a work permit on graduation if eligible. Build the file in Visa Journey.