ZoomIt for Mac: How AI Ported a 20+ Year-Old Windows Tool
Mark Russinovich explains how he used AI-assisted coding to port the long-running Sysinternals ZoomIt tool from Windows to macOS in two days, including a walkthrough of ZoomIt’s core presentation features and a demo of the new Demo Mirror capability for sharing content while staying in PowerPoint Presenter View.
Overview
This video covers the story and technical journey of bringing ZoomIt (a Sysinternals presentation utility originally built for Windows) to macOS using AI-assisted/agentic coding.
Key links from the video description:
- ZoomIt for Mac (source): https://github.com/microsoft/ZoomitForMac
- ZoomIt (Sysinternals download): https://learn.microsoft.com/en-us/sysinternals/downloads/zoomit
What ZoomIt does
Mark Russinovich walks through ZoomIt’s main capabilities used during presentations and demos:
- Zooming into areas of the screen
- On-screen annotation
- Screen capture
- Screen recording
- “Demo typing” features for live demos
Porting ZoomIt from Windows to macOS with AI
The video focuses on how AI-assisted coding was used to translate and adapt decades of Windows-focused functionality to the Mac platform, resulting in a working port in a short timeframe.
Demo: ZoomIt for Mac
A live demo shows ZoomIt running on macOS and highlights the core presentation workflow and features.
New feature: Demo Mirror
The walkthrough introduces Demo Mirror, a feature aimed at presenters who use PowerPoint:
Lets presenters share a full screen or a selected window
Designed to avoid leaving PowerPoint Presenter View while sharing content n## Chapters (from the video)
0:00 The Story Behind ZoomIt
3:16 Why ZoomIt Came to Mac
4:21 Building ZoomIt with AI
7:03 ZoomIt for Mac Demo
9:16 Introducing Demo Mirror