Sign with Google Drive on Android or iPhone The Google Drive app -- included on all Android phones and can be downloaded onto an iPhone -- includes markup tools that make it easy to sign a document.

Google Docs features tools that let you write, edit, and format text documents. All you need is a Google account and a web browser. You can also collaborate with other users in real time. The word ...

If you receive a PDF or other digital file that requires your signature, you can easily do so using your phone. Whether you ...