How to Split Layers in After Effects with Shortcuts

Splitting layers in Adobe After Effects is a fundamental editing technique that cuts an active layer into two independent parts at the exact position of your playhead. This guide provides the primary keyboard shortcuts for both Windows and macOS, details step-by-step instructions for splitting single or multiple layers simultaneously, and covers essential trimming shortcuts to help speed up your timeline workflow.

The Keyboard Shortcut to Split Layers

The shortcut divides the selected layer at the Current Time Indicator (CTI), ending the original layer at that frame and creating a new layer directly above it that starts at the next frame.

  • Windows: Ctrl + Shift + D
  • macOS: Cmd + Shift + D

How to Split a Single Layer

  1. Open your composition and navigate to the Timeline panel.
  2. Select the specific layer you want to cut by clicking on it.
  3. Drag the Current Time Indicator (CTI) to the exact frame where the split should occur.
  4. Press Ctrl + Shift + D (Windows) or Cmd + Shift + D (macOS).
  5. The layer will split into two separate entities. The lower layer ends at the playhead, and the upper layer begins immediately afterward.

How to Split Multiple Layers at Once

You can cut across multiple layers simultaneously without having to perform the action individually:

  1. In the Timeline, hold Ctrl (Windows) or Cmd (macOS) and click to select each layer you want to split. To select all layers, press Ctrl + A (Windows) or Cmd + A (macOS).
  2. Position the CTI at the desired split point.
  3. Press Ctrl + Shift + D (Windows) or Cmd + Shift + D (macOS).
  4. Every selected layer will split simultaneously at that exact frame.

Note: If no layers are selected when you press the shortcut, After Effects will split every layer in your composition at the CTI position.

Alternative Trimming Shortcuts

If your goal is to shorten a layer rather than duplicate it into two pieces, use trimming shortcuts instead of splitting:

  • Trim In-Point to Playhead: Press Alt + [ (Windows) or Option + [ (macOS) to move the beginning of the layer to the CTI.
  • Trim Out-Point to Playhead: Press Alt + ] (Windows) or Option + ] (macOS) to move the end of the layer to the CTI.