How to Uninstall Slack Completely on a Mac

If you want to uninstall Slack completely on a Mac, dragging it from /Applications to the Trash only removes the app bundle. Slack is a chat app that keeps a local cache of your workspaces' message history and files so conversations load instantly instead of re-downloading everything each time you open it — and that cache, along with your preferences and logs, lives separately in your user Library folder and survives the app's own removal.

Why dragging to the Trash isn't enough

Like almost every Mac app, Slack is really two things: the program itself in /Applications, and a set of support folders under ~/Library that it writes to while running — settings, cached data, downloaded files and logs. Deleting the app bundle removes the interface; it does nothing to the data Slack built up for as long as you used it, which for an active Slack user across several workspaces can be a genuinely large amount of cached history and shared files.

Where Slack's leftovers live

These are the same four general locations almost any macOS app — Slack included — uses outside its own bundle:

• ~/Library/Preferences — a small settings file remembering your window layout, notification preferences and account info.
• ~/Library/Caches — Slack's local cache of messages, images and files per workspace, rebuilt automatically if you reinstall. This is usually the largest of the four for a long-time Slack user, since it accumulates shared files and images from every channel you're in.
• ~/Library/Application Support — downloaded workspace data, emoji packs, and Slack's own update/installer files.
• ~/Library/Logs — diagnostic logs from past sessions.

A full uninstall means clearing the Slack-specific folder inside each of those four locations, not just the app icon. The same four-folder pattern applies to any app you remove — Slack isn't a special case, just a heavier one than most because of how much it caches.

Finding them by hand

Open Finder, press Shift-Command-G, and visit each of the four paths above, looking for a folder named "Slack" or matching its developer identifier rather than name alone — some apps store things under an identifier instead of the plain app name, which is exactly the detail that makes manual searching slow to get right.

How AI Mac Cleaner handles it instead

AI Mac Cleaner's Applications module works as an uninstaller that also finds an app's leftovers in ~/Library, matching by the app's own identifier rather than guessing from its display name. Point it at Slack and it finds the preferences, cache, support data and logs together, shows you the list before anything moves, and removes the lot in one confirmed action — instead of checking four folders by hand across however many workspaces you've been part of.

One thing it deliberately never does: list Apple's own apps, itself, or Claude as something you could uninstall. It's built for clearing out third-party software you installed and no longer want.

Nothing is deleted outright

Every removal in AI Mac Cleaner goes through its Trash-only remover, which also refuses a fixed list of protected system paths — so if you remove Slack and later realize you need a file you had shared in a channel and kept locally, it's recoverable from the Trash until you empty it yourself, on purpose.

If you'd rather not hunt through Library folders by hand, AI Mac Cleaner's Applications module does the finding for you, on Slack or anything else installed. There's a 7-day free trial with every feature unlocked and no card required, and plans start at $6.99/mo after that. See how it works.

Frequently asked questions

Does deleting Slack from Applications remove my cached messages and files too?

No. It removes the app bundle itself, but Slack's local cache of workspace messages and files, preferences and logs stay in ~/Library until you remove them separately.

Why is Slack's cache folder often so large?

Slack caches images, shared files and message history locally per workspace so conversations load instantly. The more workspaces you're in and the longer you've used them, the larger this local cache tends to grow.

Is it safe to delete Slack's leftover folders myself in Finder?

Yes, once the app is already removed — match the folder by Slack's developer identifier rather than name alone where possible, and move things to the Trash rather than deleting directly so a mistake stays recoverable.

How is AI Mac Cleaner's uninstaller different from just dragging Slack to the Trash?

It removes the app and then specifically searches ~/Library for Slack's own leftover folders by identifier, shows you the list before anything happens, and moves everything to the Trash rather than deleting it outright — one confirmed action instead of checking four folders by hand.

Will reinstalling Slack later restore my old message history from the leftover cache?

Not reliably — Slack's message history itself lives on its servers and reloads from there once you sign back in, so removing the local cache doesn't lose your conversations. The cache is just a local speed-up copy, which is why it's safe to clear.