What is a digital certificate in Spain (certificado digital)?
A digital certificate is an official electronic credential that lets you identify yourself online and sign documents electronically with legal validity when dealing with Spanish public administration and many connected services. FNMT’s citizen certificate is the best-known option for individuals.
Think of it as your secure digital ID for Spain. It is especially useful because many processes that would normally require a visit, an appointment, and printed paperwork can be handled online once you have it.
What is the FNMT digital certificate?
The same thing as the digital certificate.
The FNMT digital certificate is a citizen certificate (certificado de ciudadano, also called persona física) issued by FNMT-RCM that you install on your computer as a software certificate.
A practical detail that matters: FNMT requires you to generate cryptographic keys on your device before you can even complete the request. FNMT’s own software download page says key generation is mandatory and without it you cannot complete the application.
What is a digital certificate used for?
A digital certificate is used for digital identification and electronic signature. In plain terms, it lets you sign documents online with legal validity and access government services without going in person.
The Spanish Tax Agency explains that when you access a procedure that requires a certificate, a window appears so you can choose the correct certificate and continue. That is exactly how it feels in day to day life: you select your certificate, you authenticate, you submit.
For expats, the biggest wins are usually:
- dealing with the tax office (Agencia Tributaria) online
- managing social security and other admin portals
- signing forms and authorisations digitally instead of printing and scanning
















