Firma DNI electrónico DNIe enables users to sign documents using NFC and their DNI electronic identity document without the need for an external reader. With this app, there is no requirement for a Windows computer or additional complicated devices. All that's needed is a DNI-E, a mobile device with NFC, and knowledge of the DNI certificate password.

The app allows for electronic signing with the DNI electronic identity document, providing a secure way for Spanish citizens to authenticate and electronically sign documents and online transactions. Additionally, the app facilitates the use of the DNI electronic certificate, a digital document that enables secure online transactions and processes for citizens in Spain.