What Is On-Screen Drawing?

On-screen drawing is the broader category that includes freehand pen strokes, geometric shapes (arrows, rectangles, circles), text labels, and highlight brushes — any mark placed on the screen's surface during a recording session. The common thread is that the marks are placed on top of existing screen content rather than in a separate drawing canvas, so the annotation and the annotated content appear together in the output video. This distinction from offline annotation (where marks are added to video frames in a timeline editor) means on-screen drawing is inherently live and spontaneous.

The use cases for on-screen drawing divide roughly into two groups. In tutorial and instructional recordings, on-screen drawing is used to point out specific UI elements, trace a workflow path, or emphasize a term or value in a dense display. In live presentations and webinars, on-screen drawing serves a whiteboarding function — the presenter can sketch a concept, draw a diagram, or annotate a slide without leaving the presentation context. Both use cases share the requirement that the drawing tool must be instantly accessible and easy to dismiss so it does not interrupt the presentation flow.

Limelight focuses on freehand on-screen drawing (⌃⌥3) as part of its annotation toolkit, which also includes region spotlight (⌃⌥4) for area highlighting and on-screen text (⌃⌥5) for typed labels. Together these form a lightweight annotation layer that covers the most common tutorial annotation needs without requiring the presenter to leave the recording session or open a separate annotation app. All annotations are baked into the output video at export, making them a permanent part of the recording rather than metadata that might be stripped when the file is converted or shared.