FNMT Certificate
The gold standard for professionals and companies. It is installed directly in your browser and allows you to sign PDF documents with full legal validity. Ideal for Hacienda registrations.
Total Digitalization 2026
Digital Certificate and Cl@ve: Your Sovereign Identity in Spain
Access more than 3,000 procedures of the Public Administration from anywhere. In this definitive guide, we break down the identification technology driving efficient bureaucracy in 2026.
Used by more than 45 million citizens for management at the Tax Agency, Social Security and Town Halls.
The Electronic Administration Revolution
In the year 2026, physical interaction with government offices has become optional for the majority of citizens and residents. Digital identity in Spain is not just a convenience, it is a right and a tool for civil empowerment. Whether you need to consult your employment history or manage your self-employed registration, the Digital Certificate and the Cl@ve system are the master keys.
An Electronic Certificate is a computer file signed electronically by a certification entity (such as the FNMT) that links signature verification data to a signer, thus confirming their identity. On the other hand, Cl@ve is a system oriented towards unifying and simplifying electronic access for citizens to public services.
The importance of these systems lies in legal certainty. Every action performed with these methods has the same legal value as a handwritten signature on paper, but with the advantage of traceability and the impossibility of repudiation in digital environments.
99%
State procedures available online in 2026.
2s
Average authentication time with Cl@ve PIN.
SSL
Military-grade encryption on all connections.
+40M
Issued and active FNMT certificates.
The Authentication Ecosystem
Cl@ve PIN
Temporary one-time password. Perfect for sporadic procedures of the common citizen, such as requesting an appointment for the DNI.
Permanent Cl@ve
Access via ID and long-lasting password, reinforced by SMS. It is the most convenient method for consulting the Cadastre or fines.
DNIe 4.0: Hardware in your Pocket
Use the chip of your physical DNI with NFC technology to identify yourself on your mobile. No installations, just by bringing your card close to the smartphone.
- Maximum physical security
- Compatible with Android and iOS
European Union Citizens (eIDAS)
If you are a citizen of another EU country, you can use the electronic identification from your home country for procedures in Spain thanks to the eIDAS regulation. Essential for managing the initial NIE application.
SPID (Italy)
nPA (Germany)
Itsme (Belgium)
Which method do you need to request today?
Answer 3 questions and we will tell you which is your best option.
1. How often will you perform procedures?
2. Do you have a card reader or a mobile with NFC?
3. Do you need to sign documents legally (PDFs)?
How to obtain your FNMT Certificate (Step by Step)
1
Online Application
Enter FNMT.es, fill in your details and you will get an Application Code in your email.
2
In-person Accreditation
Book an appointment at the Tax Agency or Social Security with your DNI/NIE to validate your identity physically.
3
Download and Installation
Use the same computer and browser from the application to download the certificate and install it with the received code.
4
Backup Copy
Fundamental! Export your certificate with a password to a USB. If you format the PC without a copy, you will lose access.
Cl@ve: The Adaptive System
Cl@ve PIN (Occasional Identity)
Designed for one-off procedures. Its validity is limited in time (only a few minutes).
- Requested through a mobile APP.
- You receive a 3-character code + an SMS PIN.
- Does not require remembering passwords in the long term.
Permanent Cl@ve (Reinforced Identity)
Aimed at users who regularly access public services. Uses ID + Password.
- Allows cloud-based signing (Cl@ve Firma).
- Mandatory two-factor authentication via SMS.
- Multi-device access (PC, mobile, tablet).
Comparison: Certificate vs. Cl@ve vs. DNIe
| Feature | FNMT Certificate | Cl@ve PIN | DNIe 4.0 |
|---|---|---|---|
| Main use | Professional/Business | Citizen/Occasional | Maximum security |
| Device | Installed in Browser | Mobile (App) | Physical card + Mobile |
| Document signing | Yes (Advanced) | No | Yes (Qualified) |
| Expiration | 4 years | Does not expire (PIN expires in min.) | According to DNI validity |
| Ease of use | Medium/High | Very high | Medium (requires NFC) |
Other Access Methods
It is not always necessary to have a complex certificate to interact with the administration. Quick alternatives exist for specific cases.
Secure Verification Code (CSV)
It is a signature printed on the side of official documents (tax agency notifications, for example). It allows you to download the original document from the electronic office to verify its authenticity.
Reference Number (Tax Campaign)
A code obtained by providing data from a specific box on the previous tax return. It is used exclusively for IRPF management.
Contrast Data
Some organisms allow simple access by entering the DNI number and its expiration date or the support ID.
Did you know?
In 2026, most administrative notifications arrive through the Unique Enabled Electronic Address (DEHú). Having your certificate active is vital so you don't miss legal deadlines for appeals or fines.
Technical Troubleshooting
Configuration Failure
Make sure you have the FNMT Configurator installed. Using browsers like Chrome or Edge requires this intermediate software to recognize the certificate store.
Expired Certificate
Certificates do not renew themselves. If it expires, you will have to repeat the entire in-person accreditation process. Check the validity in Internet Options > Content > Certificates.
DNIe not detected
If you use a PC, you need a card reader compatible with the National Police driver. If you use a mobile, the NFC must be in the center of the back of the ID card.
Frequently Asked Questions
Can I have a Digital Certificate and Cl@ve at the same time?
Yes, in fact it is highly recommended. The certificate will serve you for advanced signatures on the PC, and Cl@ve will be your quick access from your mobile for agile consultations.
How do I renew my digital certificate?
If your current certificate has not yet expired, you can renew it 100% online from the FNMT website without having to go back to a physical office.
Is access through Cl@ve SMS secure?
It is a very robust Two-Factor Authentication (2FA) system. However, for extremely sensitive procedures, some organizations specifically require the Digital Certificate or DNIe.
What do I do if I have lost the PIN of my DNIe?
You must go to any Police Station that has DNI update points. There you can reset your PIN using your fingerprint instantly.
Does the certificate work on Mac or Linux?
Totally. The certificate is a cryptographic standard. On Mac, it is recommended to use Keychain Access or install it directly in browsers like Firefox.
Ready to digitalize your administrative life?
Get your digital identity today and stop wasting time in queues and offices. Your time is worth gold.