How to obtain the digital certificate FNMT in Mostoles (2026)
Cost
Free
Free of charge
Time at office
15 minutes (for identity verification only)
Estimated time
Same day
Quick summary
Instructions on how to get the citizen's digital certificate (FNMT-RCM) in Mostoles. Required for online transactions with the administration. Free of charge.
Required documents
-
Valid DNI or NIE
Original identification document to present during the verification process.
-
Compatible computer with browser
Firefox or Internet Explorer for downloading the certificate (Firefox is recommended).
: 2026
Step by step
- 1
Request your application code online
Go to official siteAccess cert.fnmt.es and enter your NIF to obtain an application code that will be sent by email.
!Expert tip
"Use the same browser throughout the process (application, verification, and download)."
- 2
Verify your identity in person
Go to a registration office (AEAT, TGSS, or City Hall) in Mostoles with your original DNI and application code.
!Expert tip
"You can verify at the AEAT office or Social Security Treasury, without an appointment in many cases."
- 3
Download the certificate
Go to official siteWithin the next few hours (or the following day), return to cert.fnmt.es with the same browser and download the certificate.
!Expert tip
"Make a secure backup of the certificate (.p12) with a strong password."
Offices and service points - Mostoles
FNMT Registration Offices — Mostoles (AEAT, TGSS, City Hall)
Frequently asked questions
What is the purpose of the digital certificate?
Does the certificate expire?
Official sources and useful links
This guide is for informational purposes only. Always check the official source for current information.