I can see how to fit an artboard to the art therein (Object -> Artboards -> Fit to selected art), but how do I do the opposite, i.e. how do I automatically resize a selected object to the artboard bounds?
Answer
You can not “do the opposite”.
There is no internal option to “fit artwork to artboard”. What you are seeking does not exists.
You may be able to write or find a custom script for this though.
Attribution
Source : Link , Question Author : dumbledad , Answer Author : Scott