HTC provides a nifty option to crop the photos in dimension specified for Facebook cover photos i.e. 851×315.
- Open the picture that needs to be cropped from your Gallery.
- Tap on “Edit” and then tap on “Transform”.
- Select “Crop” option.
- Now tap on the overflow icon (three vertical dots) and select “Facebook cover”.
- The cropping tool will now resize in proportionate to the dimensions specified for Facebook cover photo.