OneDrive sync stops when your account, network, or storage hits a limit
OneDrive stops syncing when one of three things happens: your account loses internet connection, you run out of storage space, or OneDrive detects a problem with your account permissions. The sync icon in your system tray (Windows) or menu bar (Mac) will show a pause symbol, a warning triangle, or a red X when this occurs. Which symbol appears tells you what to fix first.
Most sync failures are temporary and resolve themselves once you address the underlying cause. A few require you to sign out and back in, or to restart the OneDrive process. The steps below follow the order you should try them, starting with the quickest fixes.
Key Takeaways
- Check your internet connection first — OneDrive cannot sync if your device is offline or your connection is unstable.
- OneDrive pauses syncing automatically when your account storage is full, and resumes only after you delete files or buy more space.
- A pause symbol in the sync icon means OneDrive is waiting for you to go online; a warning triangle usually means a permissions problem with your account.
- Signing out of OneDrive completely and signing back in fixes most sync problems that do not stem from storage or connection issues.
- If sync still fails after these steps, check whether OneDrive is blocked by your antivirus software or firewall.
Confirm your internet connection is working
OneDrive requires a stable connection to Microsoft's servers. If your device is offline or your connection drops frequently, OneDrive will pause syncing and show a pause icon. Open a web browser and visit a website you know works — if the page loads, your connection is active. If it does not, reconnect to your network or contact your internet provider.
If your connection is unstable (dropping and reconnecting repeatedly), OneDrive may pause syncing to avoid corrupting files. Move closer to your router, switch from Wi-Fi to a wired connection if possible, or restart your router by unplugging it for 30 seconds and plugging it back in. Once your connection is stable, OneDrive will resume syncing automatically within a few minutes.
Check how much storage space you have left
OneDrive pauses all syncing when your account storage is completely full. You can see how much space you are using by opening OneDrive on your computer, clicking the sync icon in your system tray or menu bar, and selecting "Help & Settings" (Windows) or "Preferences" (Mac). Look for the storage meter — if it shows you are at or near your limit, that is why sync has stopped.
To resume syncing, you have two options: delete files you no longer need from OneDrive, or purchase additional storage through Microsoft 365. If you delete files, empty your OneDrive recycle bin afterward — deleted files still count toward your storage limit until the bin is emptied. OneDrive will resume syncing within a few minutes of freeing up space.
Sign out of OneDrive and sign back in
Many sync problems resolve when you sign out completely and sign back in. This refreshes your account connection and clears temporary errors. On Windows, right-click the OneDrive icon in your system tray, select "Help & Settings," then click the "Account" tab and choose "Unlink this PC." On Mac, click the OneDrive icon in your menu bar, select "Preferences," go to the "Account" tab, and click "Unlink."
After unlinking, restart your computer. Then sign back in using your Microsoft account credentials. OneDrive will re-sync all your files — this may take several minutes or longer depending on how many files you have. Do not close OneDrive or shut down your computer while this initial sync is running.
Look for account permission problems
A warning triangle or error message in the OneDrive sync icon usually means your account has lost permission to sync, or Microsoft has detected unusual activity and temporarily locked your account. Right-click or click the OneDrive icon and look for any message telling you to "fix account issues" or "verify your account." If you see this message, click it — you will be taken to a Microsoft page where you can confirm your identity and restore access.
If you do not see a message but sync is still failing, sign out and sign back in as described above. If the problem persists after signing back in, visit account.microsoft.com, sign in, and check whether Microsoft has flagged any security alerts. If your account was compromised, you may need to change your password before OneDrive will sync again.
Check whether antivirus or firewall software is blocking OneDrive
Some antivirus programs and firewalls block OneDrive from connecting to Microsoft's servers. If you have installed antivirus software recently, or if sync stopped after a security software update, this is likely the cause. Open your antivirus or firewall settings and look for a list of blocked or quarantined applications. If OneDrive is listed, add it to the allowed list or whitelist.
The exact steps vary by software — check your antivirus documentation or contact the software maker for instructions. After you allow OneDrive through, restart your computer and check whether syncing resumes. If you are unsure whether your security software is the problem, try temporarily disabling it to see whether OneDrive syncs. If it does, you have found the cause and should add OneDrive to your allowed list permanently.
Restart the OneDrive process
If none of the above steps work, close OneDrive completely and restart it. On Windows, right-click the OneDrive icon in your system tray and select "Exit." On Mac, click the OneDrive icon in your menu bar and select "Quit OneDrive." Wait 10 seconds, then open OneDrive again — on Windows, search for "OneDrive" in the Start menu; on Mac, open Applications and double-click OneDrive.
OneDrive will start syncing again when it opens. If sync still does not resume after restarting, and you have confirmed your connection is working and your storage is not full, the problem may be with your OneDrive installation. In that case, uninstall OneDrive completely, restart your computer, and reinstall it from microsoft.com/onedrive.
Frequently Asked Questions
What does the pause icon mean in OneDrive?
A pause icon means OneDrive is waiting for your device to go online or for you to take action. This usually appears when your internet connection is down or unstable. Once your connection is stable, OneDrive will resume syncing automatically. If the pause icon stays for more than a few minutes after your connection is restored, try signing out and back in.
Will OneDrive delete my files if I unlink my computer?
No. Unlinking your computer from OneDrive stops syncing but does not delete any files. Your files remain in your OneDrive account in the cloud and on your computer's hard drive. When you sign back in, OneDrive will sync again and you will see all your files.
How long does it take OneDrive to sync after I free up storage space?
OneDrive usually resumes syncing within a few minutes of you deleting files and emptying your recycle bin. If you deleted a large number of files, syncing may take longer. Do not close OneDrive while it is syncing — let it run in the background until the sync icon shows a green checkmark.
Can I sync OneDrive on multiple computers at the same time?
Yes, you can sign into OneDrive on as many computers as you want using the same Microsoft account. Each computer will sync all your files. However, if you edit the same file on two computers at the same time without syncing between edits, OneDrive will create a copy of one version to prevent data loss.
What should I do if OneDrive keeps showing a red X?
A red X usually means your account has a serious problem — often a security issue or a permissions error. Right-click the OneDrive icon and look for a message telling you to fix your account. Click that message and follow the steps to verify your identity. If you do not see a message, sign out completely, restart your computer, and sign back in.