Usually a default app setting or link configuration issue — here’s how to fix it
Clicking a Slack link — from an email, another app, or a search result — and having it open in your web browser instead of the Slack desktop app, even though the app is installed, is a common and specific issue.
The desktop app isn’t broken. Something about how links are being handled is routing you to the browser version instead. Here’s every cause and how to fix it.
Check Whether This Happens for All Links or Just Some
The pattern matters for narrowing down the cause.
Every Slack link opens in browser — likely a system-wide default app association issue, or the desktop app isn’t set as the handler for Slack links at all.
Only links from specific sources open in browser (a specific email client, a specific other app) — that source may be generating standard web links rather than ones formatted to trigger the desktop app.
It happens after a recent Slack or OS update — the update may have reset the default app association that was previously working.
Open Slack From the App Directly First
Before troubleshooting link behavior, confirm the desktop app itself opens and works normally when launched on its own rather than via a link.
Open Slack from your Start menu (Windows), Applications folder or Dock (Mac), or desktop shortcut. If it opens and signs in fine on its own, the app itself is functioning — the issue is specifically about how external links are being routed, not a problem with Slack failing to launch.
Check the “Open in App” Setting Within Slack
Slack has a setting that controls whether links open in the desktop app or browser by default, and it can get toggled or reset.
In the Slack desktop app, click your workspace name in the top left, then go to Preferences (or Settings, depending on your version). Look for a section related to Open Slack links or similar wording. Confirm it’s set to open in the Slack app rather than browser.
Set Slack as the Default Handler for slack:// Links (Windows)
Slack desktop links typically use a custom URL scheme (slack://) that Windows needs to know to route to the Slack app specifically rather than treating as a generic web link.
Go to Settings → Apps → Default Apps. Scroll down and look for Choose Default Apps by Protocol (the exact wording and location varies slightly by Windows version). Find SLACK in the protocol list and confirm it’s set to open with the Slack desktop app rather than a browser.
If Slack doesn’t appear as an option here at all, the desktop app’s installation may not have registered itself correctly as a protocol handler — reinstalling Slack (covered below) typically re-registers this association.
Set Slack as the Default Handler (Mac)
On Mac, this association is typically handled automatically when Slack is installed, but it can occasionally get overridden, particularly if you’ve reinstalled the app or have multiple versions present.
There’s no single dedicated System Settings panel for this on Mac the way there is for file types, but reinstalling Slack fresh (covered below) is the most reliable way to force Mac to re-register the desktop app as the correct handler for Slack’s custom links.
Check How You’re Clicking the Link
The specific way you’re opening a Slack link affects which version it opens in, separate from any system-level default app setting.
Clicking a notification or “Open in Slack” button within an email or another app should respect the system-level default and try to open the desktop app if properly configured.
Manually typing or pasting a slack.com URL into a browser’s address bar will always open in that browser, regardless of any default app setting, since you’re explicitly telling the browser to load it rather than going through a link click that could be intercepted by the desktop app’s URL handler.
If you’ve been pasting links into a browser directly, that’s expected browser behavior rather than a misconfiguration — use the desktop app directly, or click links rather than pasting URLs, to get the app-opening behavior.
Check for Multiple Slack Installations
If Slack was installed more than once (for example, once via a direct download and once via the Microsoft Store on Windows, or duplicated during a troubleshooting attempt), the system may be uncertain which installation should handle links, sometimes defaulting to the browser instead of resolving the conflict.
Check Settings → Apps → Installed Apps (Windows) or your Applications folder (Mac) for more than one Slack entry. If you find duplicates, uninstall all of them, restart your computer, then install a single fresh copy from slack.com/downloads.
Reinstall Slack
A clean reinstall re-registers the app’s URL protocol handlers with the operating system, which resolves the large majority of cases where links default to the browser despite the app being installed.
On Windows: Uninstall via Settings → Apps → Installed Apps → Slack → Uninstall. Delete any remaining folders at %appdata%\Slack and %localappdata%\slack. Restart your computer, then download and install a fresh copy from slack.com/downloads.
On Mac: Drag Slack from Applications to Trash. Remove ~/Library/Application Support/Slack and ~/Library/Preferences/com.tinyspeck.slackmacgap.plist. Empty Trash, restart, then reinstall from slack.com/downloads.
After reinstalling, click a Slack link from an email or another source and check whether it now opens in the desktop app.
Check Browser Settings for “Always Open in Browser” Behavior
Some browsers have a setting or remembered preference that overrides app-opening behavior for specific link types, particularly if you previously clicked “always open these links in [Browser]” at some point, even unintentionally.
In Chrome or Edge, you can check Settings → Privacy and Security → Site Settings → Protocol Handlers for any saved preference related to Slack’s protocol, and remove it if found so the system default takes over instead.
Update Slack and Your Operating System
Both Slack and OS-level updates occasionally include fixes to protocol handling and default app behavior, particularly if this issue started after either was recently updated.
Check for Slack updates via the app’s menu (Slack menu → Check for Updates on Mac, or three-dot menu → Check for Updates on Windows), and check for OS updates via Settings → Windows Update or Apple menu → System Settings → General → Software Update. Restart after installing anything, then retest.
Use the Browser Version Intentionally If You Prefer It
Worth mentioning since it’s a valid choice rather than only a problem to fix — some people genuinely prefer using Slack in a browser tab over the dedicated desktop app, for reasons like tab management, fewer separate windows, or simply not wanting another standalone app running.
If that’s actually your preference, there’s nothing to fix — bookmark app.slack.com and continue using it as you have been. The steps above are for restoring desktop-app behavior specifically if that’s what you actually want.
A Quick Checklist
Work through these in order:
- Confirm the desktop app opens normally on its own, separate from link behavior
- Check Slack’s own preference for opening links in the app vs. browser
- Check Windows protocol handler settings for the SLACK:// scheme
- Check whether you’re clicking a link or manually pasting a URL — pasting always opens in browser regardless of settings
- Check for and remove duplicate Slack installations
- Reinstall Slack to re-register its protocol handler
- Check browser protocol handler settings for a remembered “always open in browser” preference
- Update Slack and your operating system
The Bottom Line
Slack opening in a browser instead of the desktop app almost always comes down to a default app/protocol handler setting that’s pointing to the browser instead of the installed app, or simply because you pasted a URL directly into a browser rather than clicking a link. Reinstalling Slack to refresh its protocol registration, combined with checking the default app setting for the SLACK:// protocol on Windows, resolves the large majority of cases.
If you’re clicking links and still landing in the browser despite all of this checking out correctly, it’s worth confirming you actually prefer the desktop app — for some people, the browser version genuinely works just as well or better, and there’s no real fix needed in that case.
The app isn’t failing to open — something is just telling your links to go to the browser instead. Point that setting back at the desktop app and links start opening where you expect.
Meet Ry, “TechGuru,” a 36-year-old technology enthusiast with a deep passion for tech innovations. With extensive experience, he specializes in gaming hardware and software, and has expertise in gadgets, custom PCs, and audio.
Besides writing about tech and reviewing new products, he enjoys traveling, hiking, and photography. Committed to keeping up with the latest industry trends, he aims to guide readers in making informed tech decisions.