How to Fix Slack Crashing or Freezing on Windows

What Causes This?

Slack usually crashes or freezes on Windows because its local app cache gets corrupted, the app is out of date, or another background process is interfering with it. In some cases, high memory or CPU usage, graphics acceleration issues, or a damaged Slack installation can make the app unstable. Windows update problems or user profile issues can also cause Slack to hang when opening channels, loading messages, or starting up.

Common Symptoms

• Slack opens, then becomes unresponsive or closes by itself
• Messages, channels, or images stop loading
• The app freezes when switching workspaces or joining huddles
• Slack crashes at launch or gets stuck on a blank screen
• Windows shows “Slack is not responding”

How to Fix It Manually

1. Force close Slack and reopen it

   • Press Ctrl + Shift + Esc to open Task Manager.
   • Find Slack under the Processes tab.
   • Select it, then click End task.
   • Reopen Slack from the Start menu and check if it works normally.

2. Clear Slack’s app cache

   • Close Slack completely first.
   • Press Windows + R, type:

     %appdata%\Slack

     then press Enter.
   • If the folder opens, look for cache-related folders such as Cache, Code Cache, and GPUCache.
   • Delete those folders.
   • Start Slack again. Windows and Slack will rebuild these files automatically.

3. Disable hardware acceleration

   • If Slack stays open long enough, open Slack.
   • Click your profile picture in the top-right, then go to Preferences.
   • Search for hardware acceleration in settings, or open the Advanced section if available.
   • Turn it off, then restart Slack.
   • This helps if Slack freezes during video calls, screen sharing, or when rendering the interface.

4. Check for Slack and Windows updates

   • In Slack, click your profile picture and look for Check for updates if the option is available.
   • To update Windows, press Windows + I to open Settings.
   • Go to Windows Update and click Check for updates.
   • Install any pending updates, then restart your PC.

5. Reinstall Slack

   • Press Windows + I and open Apps > Installed apps.
   • Find Slack, click the three dots, then choose Uninstall.
   • After uninstalling, press Windows + R, type:

     %appdata%

     and delete the Slack folder if it is still there.
   • Download and install the latest version of Slack from its official source, then sign back in.

6. Check for system strain or software conflicts

   • Open Task Manager with Ctrl + Shift + Esc.
   • Review CPU, Memory, and Disk usage.
   • If another app is heavily using system resources, close it and test Slack again.
   • Also temporarily disable third-party overlays, screen recorders, or security tools that may interfere with Slack.

7. Try Slack in a new Windows user account

   • Press Windows + I > Accounts > Other users.
   • Click Add account and create a new local user.
   • Sign into that account and launch Slack.
   • If Slack works there, the issue may be tied to your main Windows profile rather than the app itself.

Fix It Automatically with Kudu

Kudu can automatically check for the common Windows issues that make Slack crash or freeze, including broken cache files, background resource problems, and app-related system clutter. It gives you a faster way to troubleshoot without digging through folders and settings manually, and helps restore overall PC stability at the same time.

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