Below you can see the front view size comparison of Canon 700D and Nikon D5200. Nikon D5200 is clearly the smaller of the two cameras. Its body is 4mm narrower, 2mm shorter and 1mm thinner than Canon 700D.
Canon 700D vs Nikon D5200 - Front View
Canon 700D vs Nikon D5200 - Top View
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.
Camera Size Comparison
Select Two Cameras for Size Comparison