Allows you to gather all selected objects in a form (a so-called XObject form).
Forms are rectangular frames in a PDF document that contain objects. The way in which you edit these forms and the objects inside them is different from regular objects in a PDF document. For example, you can select a regular object and move it to a random position on the page in your PDF document. Objects in forms can only be moved inside the form and thus, you can use the form to crop the object.
Note that you can use PitStop's Edit Form tool in order to edit the form and the objects it contains.