To search Google in Farsi, open a web browser and go to Google.com. Click Settings at the bottom-right corner of the page. Select Search Settings in the pop-up menu and click Languages. Choose Farsi as the default language, and click Save to finalize.
As of September 2015, Google has over 100 language settings for Google products. The currently selected language is displayed on the Language page in Search Settings. Click Edit to change the language. Search Settings also enables SafeSearch filters, Google Instant predictions, private results and spoken answers. To assist Google in displaying relevant search results and information, update your current address information under Location in Search Settings.