1. Electronic DNI (DNIe)
    The electronic DNI incorporates a chip with digital certificates that allow you to identify yourself and sign documents electronically.

    • Uses:
      • Identification in online services of public administrations.
      • Electronic signature with legal validity.
    • Advantages: Very safe and versatile.
    • Disadvantages: It requires a compatible card reader, specific software and remember the PINs provided when requesting it.
  2. Digital
    certificateIt is a digital file issued by a certification authority (such as the FNMT or the Chamber of Commerce) that is installed on the browser or device.

    • Uses:
      • Access to public and private services.
      • Digital signature of documents.
    • Advantages: Practical, does not need external devices.
    • Disadvantages: If the device where it is installed is lost, it must be renewed.
  3. Cl@ve PIN
    It is a quick identification system that generates a temporary PIN every time you need it. It works with a code that you receive on your mobile phone or in the Cl@ve app.

    • Uses:
      • Punctual access to public services.
    • Advantages: Easy to use, no software installation required.
      Disadvantages: Use limited to services that do not require advanced identification or signature.
  4. Cl@ve Permanent
    It is an identification system with a fixed username and password, complemented by a second authentication factor (usually an SMS).

    • Uses:
      • Continuous identification in public services.
    • Advantages: Ideal for those who need frequent access to public services.
      Disadvantages: Less secure than the DNIe or the digital certificate.
  5. IDcat
    IDcat is a free digital certificate issued by the AOC Consortium, specifically for electronic procedures with the Catalan administrations. It can be used both in software format and in Card format.

    • Uses:
      • Identification and electronic signature in procedures with the Catalan public administrations.
      • Access to services such as consulting the register, applying for grants or submitting official documents.
    • Advantages: Compatible with a wide range of procedures in Catalonia.
    • Disadvantages: Limited mainly to Catalonia and associated administrations.

Which is the most complete?
The electronic DNI and the digital certificate are the most complete because they allow both identification and advanced electronic signature, giving legal validity to the signed documents.