The qualified electronic signature (QES) is the highest and most secure form of digital signature in Europe. With the QES, the signatory must uniquely identify themselves. Depending on the provider and country, this can be done via VideoIdent, an on-site Ident or PostIdent procedure, or using an electric ID card (eID). The QES is person-specific and is legally equivalent to a handwritten signature. For example, you could use the qualified electronic signature to sign a digital rental agreement or a tax return.