GST3B offline utility has been launched by GSTN to help taxpayers file the return offline. The excel based GSTR3B offline utility is designed to help the taxpayer to prepare the GSTR3B return offline. The utility can be downloaded from this link. Click To Download. 

System Requirement
To use the tool efficiently, ensure that you have the following installed on your system:

  1. Operating system  Windows 7 or above.
  2. Microsoft Excel 2007 & above

Try the utility and mention your reviews in comments.