Can i shrink an database file if it has huge free space ?

Hi,

I have two database one is SharePoint Config file DB[85 GB] & other is SharePoint Application Crawl DB[30 GB] both database have a huge free space.

SharePoint Config Free Space is -->25GB

SharePoint App Crawl DB is -->14 GB

Can anyone please recommend , is it fine to shrink the Database file as it will give me huge amount of space which i require right now!!

And also please suggest in future how can i control the size of the above 2 database??

Thanks in Advance.

Regards,

Purvish Shah