Quote Originally Posted by torstan View Post
There's no restriction on image size (though the site limits the size of attached files) or on dpi.

However, people often want to use these sorts of maps for games, and there's a standard 100 pixels per grid best practice for most virtual tabletops. So, if you set the document up at 100dpi, and have a 1 inch square grid, that should work great for most uses, and keep the overall pixel size of the image manageable.

But you can win these challenges with an 800px wide map or an 8000px wide map - it's more about the content than the specs. Welcome to the challenge, jump right in!
Cool thank you