2014 Social Media Image Size Cheat Sheet + free image processing apps to re-size…
PicMonkey is a free desktop app that gives you the option to crop a photo to the Facebook cover photo size.
To crop, simply select the crop tool, choose the Facebook Timeline size, and resize your photo.
If you’re using a photo from your smartphone, try a photo app to resize it to fit the cover photo space. The PicStitch app for iPhone has a cover photo crop feature.