How to Add a 2D Collider to Sprites in Unity
By Leila · Creative Director · Game Designer
Adding collision to sprites is fundamental for 2D game development in Unity — without a collider, a sprite has no physical boundary, so the player walks straight through it. This step-by-step guide is the Inspector flow in five clicks.
Once the collider is in place, the next thing that tends to go sideways is the player sticking to the collider edges. The fix lives in How to Get Rid of Sticky Walls in Unity.
Select Your Sprite
Click on the sprite you want to give a collider. The Inspector panel on the right side displays all available settings for that object.
Add the Collider Component
In the Inspector, find Add Component. Navigate to Physics 2D and select Box Collider 2D — or any other collider that matches your sprite shape.
Adjust the Collider
A green boundary box now appears around your sprite. To refine the boundary, click Edit Collider within the Box Collider 2D component settings. Small adjustment handles appear — drag them to customize the collider’s shape and size.
Result
With a collider in place, your object now has a physical boundary. The player (or other physics objects) can’t pass through it.
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