How to Fix Acrobat Error When Splitting PDFs by File Size
Question details
Users encounter an error message stating the file is read-only or currently in use when attempting to split a large PDF by file size.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Attempting to split a large PDF document into smaller parts based on a maximum file size.
- Observed behavior
- Acrobat fails to split the PDF, incorrectly reporting that the file is read-only or locked by another application, even when it is fully accessible.
Ensure that the PDF file is saved to a local drive rather than a network or cloud-synced folder, and close all other applications that might be previewing or accessing the file.
Change Output Folder and Verify File Permissions
Saving the split files to a local folder with correct write permissions often bypasses false read-only errors triggered by network or cloud drives.
Acrobat sometimes misinterprets folder synchronization delays or network restrictions as file locks. Directing the output to a local, writable directory usually resolves this.
Right-click the original PDF file in your file explorer, select 'Properties', and ensure the 'Read-only' attribute is unchecked.
In Adobe Acrobat, go to 'Organize Pages', click 'Split', and select 'File Size' as the splitting criteria.
Click on 'Output Options' and choose 'A Folder on my Computer' instead of 'The Same Folder Selected at Start'.
Browse and select a local folder, such as your Desktop or Documents folder, then click 'OK' and proceed with the split.
Split the PDF by Page Count Instead
If Acrobat's file size calculation is causing a software defect, splitting by a specific number of pages can successfully divide the document without triggering the error.
Update Adobe Acrobat
Installing the latest patch can resolve known software bugs that cause false file lock warnings during the splitting process.
Split Large PDFs Easily with WPS Office
Bypass complex errors by using the WPS Office PDF tool to quickly and securely split your large PDF documents into smaller, manageable files.
- 1. Open the PDF: Launch WPS Office and open the large PDF document you need to split.
- 2. Access the Split tool: Navigate to the 'Page' tab located on the top toolbar and select 'Split PDF'.
- 3. Configure split settings: Choose how you want to divide the document (e.g., by specific page ranges) and select your desired output folder.
- 4. Execute the split: Click the 'Split' button to instantly process and save your new, smaller PDF files.
Frequently Asked Questions
Why does Acrobat say my file is in use when no other programs are open?
This false warning often occurs due to background synchronization by cloud storage apps (like OneDrive, Dropbox, or Google Drive), the preview pane feature in Windows File Explorer holding the file, or a known bug in certain versions of Acrobat.
How do I check if my PDF is set to read-only?
Right-click the PDF file in your file explorer, select 'Properties', and look at the 'Attributes' section at the bottom of the 'General' tab. Ensure the 'Read-only' checkbox is unchecked and click 'Apply'.
Can I split a PDF if it is password-protected?
If the PDF is secured with an owner permissions password that restricts editing or page extraction, you must first enter the password to unlock these features before Acrobat or any other software can split the file.
