Screen.currentResolution

Description

The current screen resolution (Read Only).

If the player is running in window mode, this returns the current resolution of the desktop. VRSettings.eyeTextureWidth and VRSettings.eyeTextureHeight should be used instead of this when working with VR devices.

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        print(Screen.currentResolution);
    }
}