How to Fix Cannot Delete PDF Files from OneDrive or SkyDrive (File in Use)
Question details
The user is unable to delete PDF files stored in their cloud synchronization folder due to a persistent 'File in Use' error, even when all PDF viewers are closed.

- Product
- Windows File Explorer / OneDrive
- Device & OS
- Windows 8.1
- Scenario
- Attempting to delete synced PDF documents from the local OneDrive, SkyDrive, Dropbox, or Google Drive folder.
- Observed behavior
- Windows displays a 'File in Use' error, blocking the file deletion process despite no active PDF applications like Acrobat or Reader running.
Ensure that all PDF viewing applications are fully closed and verify if your cloud storage application is currently uploading or downloading files.
Disable the File Explorer Preview Pane
The Windows File Explorer preview pane often locks PDF files in the background, preventing them from being deleted or moved.
When the preview pane is active, Windows uses a background process to generate a thumbnail or preview of the document. This process places a lock on the PDF file, making the system think it is actively in use.
Press the Windows Key + E to open Windows File Explorer and navigate to the folder containing your locked PDF file.
Click on the 'View' tab located at the top ribbon menu of the File Explorer window.
Click on 'Preview pane' to turn it off. Ensure the button is no longer highlighted.
Select the PDF file you want to remove and press the Delete key on your keyboard.

Wait for Cloud Synchronization to Finish
Cloud syncing processes temporarily lock files while they are actively being uploaded or downloaded from the cloud server.
Use Microsoft Process Explorer to Unlock the File
If standard methods fail, you can use Microsoft's advanced task management tool to manually identify and terminate the specific hidden process locking your PDF.
Manage Your PDFs Effortlessly with WPS Office
System locks and heavy background processes can disrupt your workflow. WPS Office is a lightweight, all-in-one suite that includes a powerful, built-in PDF reader and editor that operates smoothly without freezing your files.
- 1. Download WPS Office: Get the free installation package directly from the official WPS Office website.
- 2. Open the PDF Toolkit: Launch the software and navigate to the dedicated PDF tab on the main dashboard.
- 3. Manage your files smoothly: Open, edit, and save your PDFs without worrying about background preview lockups.

Frequently Asked Questions
Why does Windows say my PDF is in use when no programs are open?
This happens because hidden background processes are still interacting with the file. Common culprits include the Windows File Explorer preview pane generating thumbnails, or cloud storage apps like OneDrive and Dropbox actively syncing the file to the cloud.
Does this issue only affect SkyDrive or OneDrive?
No, the 'File in Use' error can occur with any cloud storage provider, including Google Drive and Dropbox. It is primarily triggered by the file syncing mechanism or Windows OS features like the preview pane, rather than a specific cloud app.
How do I turn off the Preview pane in newer versions like Windows 10 or 11?
In Windows 10, open File Explorer, click the 'View' tab, and uncheck 'Preview pane'. In Windows 11, click the 'View' menu on the top bar, hover over 'Show', and unselect 'Preview pane'. Alternatively, just press Alt + P.




