Remove unwanted edges or isolate a region of any GIF. Set X/Y offset, width, and height to define the crop area.
X is how many pixels from the left edge to start the crop. Y is how many pixels from the top. (0, 0) starts at the top-left corner.
No — frame timing is preserved. Only the visible area changes.
Yes, almost always smaller. A smaller canvas means fewer pixels per frame, which reduces file size proportionally to the crop area.
Gifsicle (the engine we use) will clip the crop to the actual canvas boundary, so you will not get an error — just a smaller result.