Using Gmail Email Backup Tool is the most secure tool to convert Gmail emails to docs. It can also save Gmail emails into different file formats such as PST, OST, MBOX, EML, EMLX, MSG, CSV, etc. Furthermore, it also offers to convert Gmail emails to several email clients like AOL, Gmail, Office 365, Yahoo Mail, Hotmail, Thunderbird, Opera Mail, Live Exchange, etc. Additionally, it is easily compatible with both versions of the Windows and Mac operating systems. You can try the trial version of the software to analyze the performance.