- Step 1: Give it a few minutes
- Step 2: Check what Dropbox says
- Step 3: Look at your firewall and antivirus
- Step 4: Check your date and time
- Step 5: Close the app that has the file open
- Quick reference
- Up to date but not updated
- Running out of disk space
- Mac users: give Dropbox full disk access
- When files might be damaged
- Last resort: reinstall
- My verdict
- Frequently asked questions
When Dropbox isn't syncing, give it a few minutes first, because Dropbox says large files and unreliable connections simply take longer. If it's still stuck, check your firewall and antivirus aren't blocking Dropbox, make sure your computer's date and time are correct, close any app that has the file open, and restart. On a Mac, give Dropbox full disk access.
You save a file on your laptop, open Dropbox on your phone and the old version stares back at you. Or the sync icon spins for hours. Sync problems in Dropbox usually come down to a handful of causes, and Dropbox's own troubleshooting guide walks through them. Here's the order I'd check things in, from the five-second fixes to the rarer ones.
Step 1: Give it a few minutes
It sounds too simple to be worth a step of its own, but Dropbox itself says that if your internet connection is unreliable or a file is very large, syncing can take longer, and it suggests waiting a few minutes for Dropbox to catch up. A big video or a folder of hundreds of photos can take a while to upload on an ordinary home connection, especially if other people at home are streaming at the same time.
Step 2: Check what Dropbox says
Click the Dropbox icon in your taskbar (Windows) or menu bar (Mac). It shows whether files are up to date, syncing or stuck, and often names the file causing trouble. Then check the file on dropbox.com: if you can see and edit it there, the problem's on your computer; if not, the upload never finished.
Step 3: Look at your firewall and antivirus
Dropbox lists network settings and firewalls as the usual reason the desktop app gets stuck syncing, waiting to sync or never starts. Security software sometimes blocks Dropbox after an update. Check your firewall, antivirus and any work network restrictions, and make sure Dropbox is allowed to connect. On a work laptop, your IT team may need to make that change for you.
Step 4: Check your date and time
Here's the one nobody suspects. Dropbox includes checking the date and time on your device as a sync fix. If your computer's clock is wrong, it can struggle to connect securely. Set the date and time to update automatically in your computer's settings, then quit Dropbox completely and open it again so it reconnects with the correct time.
Step 5: Close the app that has the file open
Dropbox explains that some apps lock files while they're open to prevent conflicts, which stops Dropbox from syncing them. Save your work and close the app. If a file still won't finish syncing, Dropbox suggests restarting your computer in case a crashed or background process is still holding it.
Quick reference
| Symptom | Likely fix |
|---|---|
| Stuck on syncing or waiting to sync | Check firewall, antivirus and network restrictions |
| Shows up to date but changes are missing | Wait for the upload or download to finish |
| One file never finishes | Close the app using it, then restart |
| Low disk space errors | Make files online-only or use selective sync |
| Errors reading or writing files | Run Check Disk (Windows) or Disk Utility (Mac) |
| Nothing works | Uninstall and reinstall the desktop app |
Up to date but not updated
If dropbox.com or the desktop app says files are up to date but your changes aren't showing, Dropbox says it usually means the app hasn't finished uploading your changes or downloading changes made elsewhere. Most of the time it sorts itself out. If it doesn't, go back to the firewall and network checks.
Running out of disk space
A full hard drive stops syncing in its tracks. Dropbox suggests making files online-only, so they stay in Dropbox but not on your computer, or using selective sync to choose which folders download. Both free space without deleting anything from your Dropbox.
Mac users: give Dropbox full disk access
On a Mac, privacy settings can stop Dropbox reading your files. Dropbox's guide includes steps to give Dropbox full disk access in your Mac's privacy settings, with slightly different steps for older and newer versions of macOS. If your Mac is the device that won't sync, this is worth checking early.
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When files might be damaged
If Dropbox shows errors reading or writing a file, Dropbox says there may be a problem with your computer's disk. On Windows, run Check Disk, which needs administrator rights; on a Mac, use Disk Utility. Don't interrupt Check Disk once it's running.
Last resort: reinstall
If nothing else works, Dropbox suggests uninstalling and reinstalling the desktop app. Your files stay safe in your Dropbox account online while you do it, and they sync back down once you sign in again. If you're weighing up whether Dropbox is still the right tool for your business, my piece on why file sharing gets risky as you grow is worth reading, and this cloud hosting guide explains the alternatives.
My verdict
Wait a few minutes, then check the Dropbox icon and dropbox.com to see where the problem is. Allow Dropbox through your firewall and antivirus, fix your computer's date and time, close apps holding files open and restart. Free space with online-only files, give Dropbox full disk access on a Mac, and reinstall as a last resort.
Frequently asked questions
Why is Dropbox not syncing?
Dropbox points to slow connections, large files, firewall or antivirus settings, a wrong date and time, or apps holding files open.
Why does Dropbox say up to date but my file hasn't changed?
Dropbox says the app usually hasn't finished uploading or downloading changes yet. Wait, then check your network settings.
Can my computer's clock stop Dropbox syncing?
Yes. Dropbox lists checking the date and time on your device as a fix.
How do I fix Dropbox not syncing on a Mac?
Give Dropbox full disk access in your Mac's privacy settings, then restart the app.
Will reinstalling Dropbox delete my files?
No. Your files stay in your Dropbox account online and sync back after you sign in.
