Download Camera Fit: Screen Handler Free Unity. 

Works with Unity 4.6, 5, 2017, 2018 and above.

Camera Fit is the easy way to handle screen aspect ratio for different devices, screens and window sizes!

Works on Mobile devices and all other platforms.

Supports both, orthographic (2D) and perspective (3D) cameras.

Has three different modes:
– Fixed height (pillarboxed) – Unity default.
– Fixed width (letterboxed).
– Dynamic (pillarboxed/letterboxed, depending on screen aspect ratio).