Do I need to have an app downloaded on my mobile to use a biometric signature?

No, although there is the option to do it via app, with Docuten you do not need to download the app to sign with a biometric signature.

You can do it through your internet browser. To use this type of signature, you just need a mobile device, such as a tablet or smartphone.

Want to learn how to sign a document with Docuten’s new biometric signature online? Don’t miss this informative video: