CropKit

Crops a pre-comp to what is drawn in it and keeps every layer that uses it exactly where it was.

Crops each selected pre-comp to the pixels it shows at the current frame. Layers that are switched off or transparent don't count, and neither do the layer's own masks and effects.

Like Auto Crop, but over every frame between the layer's in and out points, so nothing that moves gets cut. EffectCraft pauses until the scan is done.

Crops the pre-comp to the outline of a mask on its layer (a rectangle mask gives an exact box). With several masks, select one in the Timeline or pick it from the list.

Removes that mask after the crop. Untick it to keep the mask: it stays lined up with the content.

Pixels to leave around the crop on every side: whole pixels, and a negative value crops into the content.

The last crop: the sizes before and after, and the pixels taken off each side (+ where the padding added some).

The pre-comp's top-level layers move by the crop's offset, keys included, and every layer that uses the pre-comp, in every composition, gets its Anchor Point, masks and effect points moved to match. One Undo takes it all back.