We have a limit on the size signatures can be. For those who forget the rules which have been in place for more than 5 years, here they are.
- Limit in dimensions: 250px X 700px. Here's a sample of what 250px X 700px looks likes. Your entire signature (text, images, everything) should be no bigger than this. If you're putting things in a spoiler, don't forget that the spoiler button itself takes up space (about 40px in height).
- If you put animations in your signature, please limit it to one, and keep keep it under 300kb in file-size. Think of it this way, every time someone has to load a page for the first time, they have to download all images on the page. Because of large animations, this becomes serveral megabytes of data and they quickly add up.
- Anything NSFW has to be spoilered. Even if it's not nudity, if it's something someone could be embarassed or get in trouble while at work or school, it needs to be behind a spoiler.
You will get one warning from a mod if your signature breaks any of the rules. If you don't respond or fix your signature in a timely manner (as in, by the next time you come back to GDC), the entire thing will be deleted.