by Rolly-chan » Mon Sep 25, 2017 11:14 am
400px in height and if I remember correctly 750px in width.
(If you want it to display nicely for more users, take into account that there will be people with smaller screen resolutions (like 1024 in width) and a signature that wide will be cut off for them. Also take into account that the maximum height is set to 200px for mobile users)
If I remember correctly, that is. Hope that helps =)