If your Mac's storage is tighter than it should be, the Dropbox cache is a prime suspect. The Dropbox cache on Mac can quietly accumulate gigabytes of data in a hidden folder most users never see — and Dropbox's own interface gives you no easy way to find or clear it. This guide shows you exactly where the cache lives, what it contains, how to remove it safely, and what happens after you do.
Where Is the Dropbox Cache Stored on Mac?
Dropbox keeps its cache in a hidden folder inside your Dropbox directory itself, not in the standard ~/Library/Caches location where most apps store temporary data. The exact path is:
~/Dropbox/.dropbox.cacheBecause the folder name starts with a dot, macOS hides it from the Finder by default. It exists at the root of your local Dropbox folder — so if your Dropbox is synced to the default location, the full path expands to something like:
/Users/yourname/Dropbox/.dropbox.cacheIf you moved your Dropbox folder to a custom location (an external drive, for example), the cache follows it there.
What Is Inside .dropbox.cache?
The cache holds temporary copies of files that Dropbox is in the middle of syncing, has recently synced, or is keeping as a short-term buffer to speed up conflict resolution. Specifically, you will find:
- In-progress upload chunks — partial pieces of large files being sent to Dropbox servers.
- Recently synced file copies — Dropbox holds onto these for a short window in case a sync conflict needs to be resolved locally without a round-trip to the cloud.
- Deleted or moved file remnants — files you removed from Dropbox that haven't yet been purged from the local cache.
Dropbox is supposed to manage this folder automatically and prune old entries, but in practice it can grow large — sometimes several gigabytes — especially after syncing many large files, after a sync error, or simply because the automatic cleanup hasn't run recently.
How to See the .dropbox.cache Folder in Finder
Finder hides dot-folders by default. To reveal hidden files temporarily, use this keyboard shortcut while a Finder window is open:
Command + Shift + .This toggles hidden files on and off. With hidden files visible, open your Dropbox folder and you will see .dropbox.cache appear. You can then Get Info (Command + I) on it to see how much space it occupies before deciding whether to clear it.
To check its size from Terminal without opening Finder:
du -sh ~/Dropbox/.dropbox.cacheHow to Clear the Dropbox Cache on Mac
Clearing the cache is straightforward, but there are two important precautions: quit Dropbox first, and confirm that all your files have finished syncing.
- Check that Dropbox is fully synced. Click the Dropbox menu-bar icon and confirm it shows "Up to date." Do not clear the cache while files are actively syncing — you could corrupt an in-progress transfer.
- Quit Dropbox. Click the Dropbox menu-bar icon, click your avatar or the gear icon, and choose Quit Dropbox. Wait for the icon to disappear from the menu bar.
- Open Terminal (Applications → Utilities → Terminal).
- Delete the contents of the cache folder (not the folder itself — Dropbox will recreate files it needs, but it is safest to leave the directory in place):
rm -rf ~/Dropbox/.dropbox.cache/*If you also want to remove hidden dot-files directly inside the cache folder, add a second pass:
rm -rf ~/Dropbox/.dropbox.cache/.* 2>/dev/null; true- Reopen Dropbox. Launch it from Applications or Spotlight. It will recreate an empty
.dropbox.cachefolder and resume syncing normally.
Is It Safe to Delete the Dropbox Cache?
Yes — provided Dropbox is fully synced and not running when you delete the cache contents. The cache is purely a local performance buffer; your actual files live in the cloud and in the main Dropbox folder. Clearing the cache does not delete any of your Dropbox files.
That said, cleaning is permanent. Once you run rm -rf, there is no undo. If you later discover a sync conflict or a missing file version, the local cache buffer is already gone. For that reason, it is worth making sure Dropbox shows "Up to date" — not "Syncing" or "Paused" — before you clear anything.
When Will the Cache Grow Back?
Immediately. As soon as Dropbox restarts and you begin using files normally, the cache folder will start filling again. This is expected behavior. For most users on a typical day, the cache stays small — under a few hundred megabytes. It only grows large when you sync a lot of big files, after a network interruption that stalls in-progress transfers, or when Dropbox's internal cleanup routine falls behind.
There is no setting inside Dropbox to limit the cache size or schedule automatic cleanups.
Finding .dropbox.cache With a Disk Auditor
If you want to track the Dropbox cache size over time alongside everything else consuming space on your Mac — without running Terminal commands each time — Crumb surfaces the .dropbox.cache folder in its whole-Mac disk audit. Because Crumb scans hidden directories, it picks up the cache and shows you its size in context with your other large folders, so you can decide whether it warrants clearing. You can also use its "Is this safe to delete?" feature to get a plain-English explanation of any folder before touching it.
If you prefer a one-click workflow, download Crumb — the free tier includes a full disk visualization and audit, so you can at least see what is taking up space before deciding how to act.
Dropbox Cache vs. Other Dropbox Temp Locations
| Location | What it contains | Safe to delete? |
|---|---|---|
~/Dropbox/.dropbox.cache |
Sync buffer, in-progress transfers, recent file copies | Yes, when Dropbox is quit and fully synced |
~/Library/Caches/com.dropbox.DropboxMacClient |
App UI cache, thumbnails, metadata | Generally yes; Dropbox rebuilds it on next launch |
~/Library/Application Support/Dropbox |
Account config, sync database (filecache.db) |
No — deleting this forces a full re-index of your entire Dropbox |
The most important takeaway from the table: leave ~/Library/Application Support/Dropbox alone. Clearing it forces Dropbox to rebuild its entire local database, which means re-downloading metadata for every file in your account — a process that can take hours or days for large accounts.
Summary
The Dropbox cache on Mac lives at ~/Dropbox/.dropbox.cache — a hidden folder inside your local Dropbox directory. It accumulates sync buffers and temporary file copies that Dropbox should prune automatically, but often doesn't. To clear it safely: verify Dropbox is fully synced, quit the app, run rm -rf ~/Dropbox/.dropbox.cache/* in Terminal, then relaunch Dropbox. The cache will return as you use Dropbox normally — that is fine and expected. The key is knowing the folder exists and knowing when clearing it is safe versus not.