Is this to big for a sig?

Yes it is too big. The maximum is 650x350 pixels. For more details check this thread out http://sythe.org/showthread.php?t=1304360

 

Ah alrighty ty

 

Width is fine, however it's 33 pixels too tall.

To check signatures and stuff on Sythe yourself, search for MeasureIT (On Chrome and Firefox.) It's an extension which allows you to drag a box around an area and it'll tell you the pixels. Really handy