Share Part of Your Screen in Slack on Mac
No Slack plugin required. Share the RegionMirror window using Slack's normal screen-sharing controls.RegionMirror lets you select a portion of your Mac screen and share it in Slack as a normal app window — useful for quick demos, bug walkthroughs, design reviews, and ultrawide monitor setups.
Free 7-day trial · $19.99 one-time purchase · macOS 13.5+
Full-screen Slack shares can show more than you want
Slack screen sharing is great for quick collaboration, but sharing your full display can be too much when you only need to show one section of your screen. This is especially frustrating on large or ultrawide monitors, where full-screen sharing can make everything hard to read.
- Full-screen sharing can expose more than you want
- Viewers may struggle to read content from an ultrawide display
- Sharing an app window becomes a hassle when you need to switch apps
- Resizing windows before a quick Slack call wastes time
- You may want to keep unrelated desktop areas out of view
Share a selected region in Slack instead
RegionMirror mirrors a selected region of your Mac screen into a separate window. In Slack, share the RegionMirror window instead of your full display — a fast way to share a portion of your Mac screen.
Three steps to sharing part of your screen in Slack
Select the part of your Mac screen you want to show
Drag out the exact area you want your Slack call to see.
RegionMirror mirrors that selected portion into its own window
The selection becomes a normal macOS window you can move or resize any time.
Share the RegionMirror window in Slack
In Slack, use the normal screen-sharing controls and pick the RegionMirror window.
Ready to try it? Download RegionMirror and share only the section your Slack call needs.
Download Free on the Mac App StoreBuilt for quick Slack calls
Quick team demos
Show a feature or fix without a full screen share.
Developer pairing
Share code and a terminal at a readable size.
Bug walkthroughs
Point to exactly the area where something's broken.
Design reviews
Present mockups and prototypes clearly.
Support calls
Show a teammate exactly the area they need to see.
Sharing a dashboard or browser region
Present analytics or a web app without extra clutter.
Sharing part of an ultrawide monitor
Share a readable region instead of a scaled-down display.
Slack, and every other meeting app
No meeting plugin required. Share the RegionMirror window using Slack's normal screen-sharing controls.
Slack
Share the RegionMirror window using Slack's normal screen-sharing controls.
Microsoft Teams
Also works with Teams' normal window-sharing feature.
Webex
Also works with Webex's normal window-sharing feature.
Google Meet
Share the RegionMirror window like any other app window.
Discord
Share the RegionMirror window like any other app window.
And more
Any other app that supports window sharing works the same way.
See it work in Slack
Share only the section your Slack call needs to see, while keeping the rest of your Mac screen out of the share.
Share only what your Slack call needs.
Select a region, share the window, and keep the rest of your desktop to yourself.
Download Free on the Mac App StoreFree 7-day trial · $19.99 one-time purchase · macOS 13.5+
Questions, answered.
Can Slack share only part of my screen?
Slack can share screens and windows. RegionMirror gives you a normal Mac window that mirrors the part of your screen you choose, so you can share that selected portion in Slack.
How do I share a portion of my screen in Slack on Mac?
Use RegionMirror to select the screen region you want to show, then share the RegionMirror window in Slack.
Does RegionMirror require a Slack plugin?
No. RegionMirror works with Slack's normal screen-sharing controls.
Is RegionMirror useful for quick Slack calls?
Yes. RegionMirror can be useful when you want to quickly show one section of your screen without resizing apps or changing your monitor setup.
Does RegionMirror work with ultrawide monitors?
Yes. RegionMirror is especially useful for large and ultrawide displays where full-screen sharing can make content hard to read.