Communication

How to Completely Uninstall Mattermost on Mac

To remove the app, quit it and drag the icon to the Trash. This process alone does not delete associated data folders, which typically occupy 200 MB – 2 GB.

Last updated: November 1, 20262 min read

Remove Mattermost and everything it leaves behind

Mattermost data usually takes 200 MB – 2 GB on a Mac. The free scan shows the exact size on your Mac before you change anything.

Scan your Mac free

Free scan · No account · Nothing is deleted without your OK · Moves to the Trash first · macOS 14+

Application: Mattermost
Typical data size: 200 MB – 2 GB
Category: Communication
File Location: ~/Library/Application Support/Mattermost

Manual cleanup steps

Quit the app completely (⌘+Q in the menu bar).
Move Mattermost from the Applications folder to the Trash.
Remove the folders Mattermost left behind, listed in the table below.
Empty the Trash to free up the space.

Everything Mattermost keeps on your Mac

1 locations. Tick each one as you remove it; back up anything marked as your data first.

~/Library/Application Support/Mattermost App data · server list, sessions and web cache Yes, once the app is gone~/Library/Application Support/Mattermost/Cache Cache · Chromium disk cache for web content Yes, rebuilt automatically~/Library/Application Support/Mattermost/Code Cache Cache · compiled JavaScript cache Yes, rebuilt automatically~/Library/Application Support/Mattermost/GPUCache Cache · GPU shader cache Yes, rebuilt automatically~/Library/Application Support/Mattermost/logs Logs · Mattermost app logs Yes, rebuilt automatically

Locations are the standard macOS folders Mattermost uses; some appear only after you use the matching feature.

Remaining files after removing Mattermost

Specific to Mattermost

Dragging the app to the Trash leaves behind support folders containing your server list, session data, and various caches. Because it is an Electron app connecting to self-hosted servers, these files primarily store web content and connection settings. You must manually navigate to ~/Library to remove them since this directory is hidden by default.

Account and sync: Messages and files live on your organization's Mattermost server; the Mac keeps only caches and the server list.

Preparing to uninstall Mattermost

Since messages and files reside on your organization's server rather than locally, the app only maintains temporary copies. However, certain local configurations and downloaded files will remain on your Mac until deleted separately. Ensure all necessary information is recorded before you empty the Trash.

Note the server URLs you are currently connected toSign out of each server within the appSave any downloaded attachments you wish to keepQuit the app completely

0 of 4 done

By hand or with OptiClear

	By hand	With OptiClear
Places to check	1 folders, one by one	One scan
File sizes	You look them up yourself	Shown for every item
Removing the wrong thing	Easy to delete the wrong folder	Goes to the Trash first, so it can be restored
Cost	Free	Scan is free; cleaning needs Pro (yearly plan has a 7-day free trial)

See it working

OptiClear — Scan overview — every category on one screen — Scan overview — every category on one screen

OptiClear — Privacy audit: what each app has been allowed to reach — Privacy audit: what each app has been allowed to reach

OptiClear — Large and aging files, ranked by what they cost you — Large and aging files, ranked by what they cost you

Try it without risk

Download and scan for freeSee every Mattermost file and its size. No account needed.
Clean free for 7 daysStart the 7-day free trial of the yearly plan inside the app.
Keep it or cancelCancel in your App Store settings at least 24 hours before the trial ends and you won't be charged.

Download free and scan

After the free trial, Pro costs $39.99 per year in your country's App Store; cancel any time.

Frequently asked questions

Yes. Folders marked “Yes, rebuilt automatically” are rebuilt automatically; removing them only makes the next start slower. Items marked “Yes, once the app is gone” only matter while Mattermost is installed, so remove them after the app.

Will my messages be deleted if I remove the application folders?

No, because your messages and files live on your organization's server.

What happens to the server list after I empty the Trash?

The server list stays in the Application Support folder until you delete it manually.