UPDF Sign is described as 'Online tool for digitally signing PDF documents. It allows users to sign, send, and manage documents securely and efficiently. It uses legally-binding, certificate-based signatures, enabling documents to be sent, signed, and tracked securely from any device' and is a E-signature tool in the office & productivity category. There are more than 50 alternatives to UPDF Sign for a variety of platforms, including Web-based, SaaS, Android, iPhone and iPad apps. The best UPDF Sign alternative is OpenSign, which is both free and Open Source. Other great apps like UPDF Sign are eSign Launchpad, Docusign, DottedSign and LibreSign.