The appointment is booked on the government's electronic portal: sede.administracionespublicas.gob.es. Select your province and the procedure "Policía — Toma de Huellas (Expedición de Tarjeta)" or similar.
In large cities (Madrid, Barcelona, Valencia, Málaga), appointments run out quickly. It is best to try first thing in the morning or at midnight, when new slots are released. In January 2026 a pilot programme was launched in L'Hospitalet de Llobregat (Barcelona) that automatically assigns appointments within about 15 days of a favourable resolution.