Log in to your Gmail account.
Click on the drop-down option just below the Google logo image.
Select contacts option.
Now on the left side, you can see more option with some sub-options.
click on the Export option.
You can see some options in a pop up window.
Select Contacts: Now you can select all contacts or contacts from a particular contact group.
Export as: you can export your contacts as a Gmail CSV, Outlook CSV or vCard for ios contacts.