Your total signature space allowed is 550 (Width) x 500 (Height). This includes space taken up by text and images.
Edit by DBP:Since I rarely resize things, usally i have my stuff 600 Width
Absolute Maximum Filesize Limit - 4MB
This is also for the entire signature, not just individual files
Being considerate about this will help with loading times and make the Forum much smoother to browse.
Thanks for reading.
lol copyapasta