If you don’t want your cover image to be cropped or warped on your fresh new Facebook Timeline then the perfect size is 851px wide by 315 px high. Kind of strange numbers, but that is it!
You can create your cover image on any program that allows you to crop to pixel like Photoshop, Illustrator, even Paint.
Also make sure your image is compressed to 72 dpi (dots per inch) which is the standard for web. If it is larger like 300-600 dpi (for print) Facebook will either say it is too large or compress it too much and it will loose quality in the compression.
We snagged the image to the left from dustri.al. Thanks! Click here for Photoshop Timeline & Facebook Events Templates