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The Mask Editor is a built-in tool in ComfyUI that lets you create and edit masks directly on your images — no external image editor needed. It supports multiple drawing tools, layer management, undo/redo, canvas transformations, and GPU-accelerated brush rendering.

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How to Open

There are three ways to open the Mask Editor:
  1. Selection Toolbox — Select a Load Image node, then click the Mask icon button in the selection toolbar above the node.
  2. Image Overlay — Hover over the image preview (gallery mode), then click the Edit or mask image button (mask icon) that appears in the top-left corner.
  3. Right-Click Menu — Right-click a Load Image node and select Open in Mask Editor from the context menu.
The Mask Editor is available in both Graph Mode and App Mode.