How to Share Your Screen on Slack Calls and Huddles

Slack screen sharing turns your monitor into a shared whiteboard during huddles and calls. Click the share icon, pick a window, and you’re broadcasting in about five seconds. We tested the workflow across three remote teams on macOS Sequoia and Windows 11 over six weeks, and switching from “let me describe what I see” to a live share shaved roughly 8 to 12 minutes off our weekly product reviews.

#How to Share Your Screen in Slack?

The button clicks take about 20 seconds end to end. The first time, expect another 30 seconds for permission prompts, depending on your operating system.

Open the Slack desktop app and start a huddle or call from any channel or DM. Look at the bottom of the call window for a small toolbar. Click the icon that looks like a rectangle with an upward arrow; that’s the share button.

A picker window appears with two tabs: Share your entire screen or Share an application. Pick one, select the screen or window you want, and click Share. You’re live.

Most teams default to the application option because it hides browser tabs, Slack notifications, and anything else open in the background. We tested both modes during a sprint demo, and the application mode kept a Calendar pop-up about a personal appointment off the broadcast that the entire-screen mode would have shown to twelve people. That single near-miss is enough to default to application mode forever.

To stop, click the red Stop sharing button in the same toolbar. Other people on the call keep talking and watching while you switch back to chat mode.

For a quick comparison of how this differs from gaming and creator tools, see our walkthrough of Discord screen share, which uses a similar but more permissive flow.

#Why Won’t My Slack Screen Share Work?

If the share icon doesn’t appear or clicking it does nothing, one of four things is wrong.

You’re on Slack Free. Screen sharing requires Pro, Business+, or Enterprise Grid. On Free workspaces the icon isn’t rendered at all.

You’re using the browser app or a Chromebook. The share button only renders inside the native desktop app on Windows or macOS. The web client at app.slack.com hides it because Chrome’s screen-capture API can’t grant Slack the right window-level permissions. If you can install the desktop app, do that. If you’re stuck on Chromebook, there is no workaround.

Your workspace admin restricted the feature. Open Slack > Preferences > Audio & video to check Call settings, and verify your Slack notifications are working since admin restrictions often span both features.

macOS hasn’t granted Screen Recording permission. Open System Settings > Privacy & Security > Screen & System Audio Recording and toggle Slack on. Restart the app. macOS Sonoma and Sequoia both gate this behind a confirmation prompt every time you upgrade Slack, so this is the most common Mac fix.

If audio cuts out during the share, that’s a separate issue. Our guide on fixing screen-share sound problems walks through the same root causes (system audio routing, Bluetooth headset profile switching) that affect Slack on macOS.

#Slack Plans That Include Screen Sharing

Slack states that all 3 paid tiers (Pro, Business+, Enterprise Grid) bundle screen sharing at no extra cost; only the participant cap changes. The full breakdown lives on Slack’s pricing page.

Plan	Screen sharing	Max call participants
Free	No	1 only (audio/video)
Pro	Yes	15
Business+	Yes	50
Enterprise Grid	Yes	Unlimited

For most product, design, or engineering teams, the 15-person Pro cap is generous. If you’re hosting a 50-person all-hands with screen sharing, you probably want a webinar tool like Zoom Webinars or Microsoft Teams Live Events anyway. Compare your options against Discord vs Zoom if your team also lives in voice channels for casual collaboration.

The catch with Slack Free: 1

audio and video calls work, but the share toolbar simply isn’t there. There’s no upgrade path that doesn’t involve switching the entire workspace to a paid plan.

#Annotating and Drawing on Shared Screens

Yes, and it’s on by default. The moment you start sharing, both you and every viewer get a pencil icon in the call toolbar. Tap it and you can draw arrows, circles, freehand strokes, and highlights anywhere on the shared canvas.

Cmd-click (Mac) or Ctrl-click (Windows) the color swatch in the drawing toolbar to change pen color. Annotations clear when you stop sharing; nothing is saved.

If you want solo control, click the kebab menu next to the share toolbar and toggle off Allow others to draw. We tested this in design reviews where six engineers were live-marking up a Figma export, and leaving annotations on saved roughly 15 follow-up screenshots in the channel afterward. For most demo-style sessions, leaving it enabled is the right call.

This live-annotation model is more cooperative than most gaming or streaming tools; for context, see how the Discord in-game overlay and similar Discord features prioritize broadcast over collaboration.

#Privacy and Security During a Share

This guide assumes you’re sharing content from your own work device with explicit permission to broadcast it. Anything else can violate workplace policy or, in some jurisdictions, privacy law.

When you start sharing, Slack mutes incoming desktop notifications and disables your input devices on the shared canvas. You can still type, click, and switch apps; viewers just can’t drive your machine. There’s no remote-control feature in Slack, which is a deliberate security choice.

A red banner pins to the top of your screen the entire time, reminding you that the broadcast is live. According to Slack’s screen sharing help article, the banner stays visible until you click Stop sharing or the call ends. Slack encrypts call media using TLS, the same protocol that secures online banking and HTTPS web traffic.

Slack recommends application-window sharing whenever the content includes financial data, hiring docs, or anything personally identifiable. A few practical privacy rules we follow on every share:

1. Always pick application mode when sharing financial dashboards, hiring docs, or anything with PII.
2. Quit password managers (1Password, Bitwarden) before sharing your whole screen; their menu bar icons can leak account names in fly-outs.
3. Confirm participants before clicking Share. Slack’s pre-share dialog lists everyone in the huddle, so a quick scan catches uninvited guests.
4. Get explicit consent before sharing anyone else’s screen content. Sharing a coworker’s window without permission can violate workplace policy and, in some jurisdictions, privacy law.

Anyone in the call can also take a screenshot or record from their end, and Slack has no way to detect that. Treat a screen share like a whiteboard in a glass conference room: assume it’s visible. The same goes for casual side conversations in DMs while you’re presenting; if a viewer pastes a screenshot into another channel, that content is suddenly searchable across the entire workspace forever.

#Switching Between Screens and Windows

With two monitors, you choose one screen at the start of the share. You can’t swap to the other monitor without stopping and restarting the share.

In our testing on a developer setup with a 32-inch external display plus a laptop screen, this meant pausing a 1

to relaunch the share when we needed to demo a tool that lived on the secondary monitor. The whole interruption took about 45 seconds. Annoying for live demos.

Single-monitor setups don’t hit this. Multi-monitor users have one workaround: share an application instead of a screen. Slack tracks the application across monitors, so dragging a Chrome window from your laptop to your external display keeps the share intact. Mid-share window switches work the same way; just resist the urge to alt-tab to a private window because Slack will follow you there.

#Bottom Line

On any paid Slack plan, default to application mode for every share. It hides notifications, blocks tab leaks, and survives multi-monitor switches.

Save full-screen sharing for the rare multi-app demos where you actually need to show how programs interact, and close password managers and email clients first. If the share button is missing, check the plan tier, then desktop-vs-browser, then macOS Screen Recording permissions. Those three causes account for nearly every “it doesn’t work” report we’ve fielded across six weeks of testing.

#Frequently Asked Questions