# Enable collision detection for tiles

> Add a Tilemap Collider 2D component to a tilemap, choose which tiles collide, and merge shapes with a Composite Collider 2D component for better performance.

To enable collision detection for [tiles](/engine/6000.0/manual/unity2d/tilemaps/reference/tile-asset.md), add a Tilemap Collider 2D component to the tilemap.

The Tilemap Collider 2D component automatically generates collider shapes for each tile in the tilemap, so that GameObjects with a `Collider2D` component collide with the tiles.

You can choose which tiles to enable collision for.

## Add a Tilemap Collider 2D component

To add the component to a tilemap, follow these steps:

1. Select an existing tilemap GameObject in your project, or [create a tilemap](/engine/6000.0/manual/unity2d/tilemaps/create-tilemap/create-tilemap.md).
2. In the Editor window, select **Add Component**.
3. Search for and add the **Tilemap Collider 2D** component from the list.

The Scene view displays the collider shapes as green outlines over the tilemap.

To make another GameObject collide with the tiles, refer to [Collider 2D](/engine/6000.0/manual/unity2d/2d-physics/collider-2d.md).

## Disable collisions for a tile

Follow these steps:

1. In the **Project** window, select a tile asset.
2. Set **Collider Type** to **None**.

## Create a custom collider shape

To change the shape that a tile uses to register a collision, use the Custom Physics Shape window in the Sprite Editor.

1. In the **Project** window, select a tile asset.
2. Set the **Collider Type** to Editor.
3. Select **Sprite Editor**.
4. In the **Sprite Editor** window, in the dropdown at the top-left, select **Custom Physics Shape**.

For more information about editing the shape, refer to [Create collision shapes for a sprite](/engine/6000.0/manual/unity2d/sprite/create-collision-geometry.md).

## Reduce the number of collider shapes

To improve the performance of a tilemap with many collider shapes, add a Composite Collider 2D component. Unity merges the collider shapes of neighboring tiles together, which reduces how much Unity needs to calculate during a physics update.

Follow these steps:

1. Select a tilemap with a **Tilemap Collider 2D** component.
2. In the **Inspector** window, select **Add Component**.
3. Search for and add the **Composite Collider 2D** component from the list.

For more information, refer to [Composite Collider 2D component reference](/engine/6000.0/manual/unity2d/2d-physics/collider-2d/composite-collider-2d/reference.md).

To further configure performance and collider behavior, use the [`TilemapCollider2D` API](/engine/6000.0/script-reference/unityengine/tilemaps/tilemapcollider2d.md).

## Update collider shapes manually via API

By default, when you add or remove tiles, the Tilemap Collider 2D updates shapes during `LateUpdate` and batches multiple changes together for performance. To force immediate updates, follow these steps:

1. Call [`Tilemaps.TilemapCollider2D.ProcessTilemapChanges`](/engine/6000.0/script-reference/unityengine/tilemaps/tilemapcollider2d/processtilemapchanges.md) to process changes immediately.
2. Check [`Tilemaps.TilemapCollider2D-hasTilemapChanges`](/engine/6000.0/script-reference/unityengine/tilemaps/tilemapcollider2d/hastilemapchanges.md) to determine if processing is required.

For more information, refer to the [`TilemapCollider2D` API](/engine/6000.0/script-reference/unityengine/tilemaps/tilemapcollider2d.md).

## Additional resources

* [Set up tilemap collision (Unity Learn)](https://learn.unity.com/course/2D-adventure-robot-repair/unit/game-environment-and-physics/tutorial/set-up-tilemap-collision?version=6.5)
* [Tile asset reference](/engine/6000.0/manual/unity2d/tilemaps/reference/tile-asset.md)
* [Tilemap Collider 2D component reference](/engine/6000.0/manual/unity2d/tilemaps/tilemap-collider-2d/reference.md)
* [Composite Collider 2D component reference](/engine/6000.0/manual/unity2d/2d-physics/collider-2d/composite-collider-2d/reference.md)