is Synchronization of local and online database possible

is Synchronization of local and online database possible with HeidiSQL.

Yes. Just have a look at the SQL export feature. You just need to set up your local and online sessions in the session manager. Once having done that, the export dialog allows you to directly export structure and/or data from one server to another.

Thanks for reply. It seems quite handy software. Will it be done automatically, like can I schedule to do so every day or with every change. or I have to do manually.

No, HeidiSQL's features are not schedulable. There are only very few commandline parameters.