Use the Sprite Editor

When you have an image that is a single character with different parts, such as a car with wheels which each move independently, you can use the SpriteA 2D graphic objects. If you are used to working in 3D, Sprites are essentially just standard textures but there are special techniques for combining and managing sprite textures for efficiency and convenience during development. More info
See in Glossary Editor to extract different parts from that image into separate sprites from the same texture.

Note: Make sure the graphic you want to edit has its Texture Type set to Sprite (2D and UI). For more information on importing and setting up sprites, refer to Set up sprites.

Sprite textures with multiple components need the Sprite Mode to be set to Multiple in the InspectorA Unity window that displays information about the currently selected GameObject, asset or project settings, allowing you to inspect and edit the values. More info
See in Glossary.

Open the Sprite Editor

To open the Sprite Editor:

1. Select the 2D image you want to edit from the Project View (Fig 1: Project View).
   Note: You can’t edit a sprite by selecting it in the Scene View.

2. Click on the Sprite Editor button in the Texture Import InspectorAn Inspector that allows you to define how your images are imported from your project’s Assets folder into the Unity Editor. More info
   See in Glossary (Fig 2: Texture Import Inspector) and the Sprite Editor displays (Fig 3: Sprite Editor).

Note: You can only see the Sprite Editor button if the Texture Type on the image you have selected is set to Sprite (2D and UI).

Note: Set the Sprite Mode to Multiple in the Texture Import Inspector if your image has several elements.

Along with the composite image, you will see a number of controls in the bar at the top of the window. The slider at the top right controls the zoom, while the color bar button to its left chooses whether you view the image itself or its alpha levels. The right-most slider controls the pixilation (mipmap) of the Texture. Moving the slider to the left reduces the resolution of the Sprite Texture. The most important control is the Slice menu at the top left, which gives you options for separating the elements of the image automatically.

Select the Apply and Revert buttons to keep or discard any changes you have made in the Sprite Editor window respectively. You set these buttons to display a confirmation dialog before applying their effects in Unity’s Preferences window (menu: Edit > Preferences…). In the Preferences window, go to 2D > Sprite Editor Window to open the Sprite Editor window options.

Select the respective option to have a dialog appear after selecting Apply or Revert to confirm your selection, preventing accidental saving or discarding of changes made.

Use the Editor

The most direct way to use the editor is to identify the elements manually. If you click on the image, you will see a rectangular selection area appear with handles in the corners. You can drag the handles or the edges of the SpriteRect to resize it around a specific element. Having isolated an element, you can add another by dragging a new SpriteRect in a separate part of the image. You’ll notice that when you have a SpriteRect selected, a panel appears in the bottom right of the window:

The controls in the panel let you choose a name for the Sprite graphic and set the position and size of the SpriteRect by its coordinates. A border width, for left, top, right and bottom can be specified in pixelsThe smallest unit in a computer image. Pixel size depends on your screen resolution. Pixel lighting is calculated at every screen pixel. More info
See in Glossary. The borders are useful when 9-Slicing Sprites. There are also settings for the Sprite’s pivot, which Unity uses as the coordinate origin and main “anchor point” of the graphic. You can choose from a number of default SpriteRect-relative positions (for example, Center, Top Right, etc) or use custom coordinates.

The Trim button next to the Slice menu item will resize the SpriteRect so that it fits tightly around the edge of the graphic based on transparency.

Note: Borders are only supported for the UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary system, not for the 2D Sprite RendererA component that lets you display images as Sprites for use in both 2D and 3D scenes. More info
See in Glossary.