Fix Adobe Acrobat Cannot Combine Scanned PDFs
Question details
The user is unable to merge or combine scanned PDF files using Adobe Acrobat, even though the individual files can be opened and viewed.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Attempting to combine multiple scanned PDF documents into a single file for better organization or sharing.
- Observed behavior
- The software fails to combine the files, often due to hidden security restrictions, corrupted file structures from the scanning process, or incompatible PDF settings.
Verify that you have editing permissions for the PDFs you are trying to combine, and ensure you have the original file passwords if the documents are secured.
Check Security Settings and Recreate the Scanned PDFs
Verify if the PDF has editing restrictions preventing document assembly, and remove the security policies or recreate the files as standard PDFs.
Even if a scanned PDF opens perfectly in Acrobat Reader, hidden document security policies can restrict functions like page extraction and document assembly. Removing these restrictions or re-saving the corrupted scanned file will often resolve merging failures.
Open each scanned PDF in Adobe Acrobat, click on the 'File' menu in the top left corner, and select 'Properties' from the dropdown list.
Navigate to the 'Security' tab within the Document Properties window. Review the Document Restrictions Summary to see if 'Document Assembly' and 'Page Extraction' are set to 'Allowed'.
If the document is secured, change the 'Security Method' to 'No Security'. You will be prompted to enter the permissions password to apply this change.
If there are no security restrictions but the file still fails to combine due to corruption, use the 'Print' function and select 'Microsoft Print to PDF' or 'Adobe PDF' as your printer to recreate a fresh standard PDF.
Merge Scanned PDFs Without Hassle in WPS Office
If your current PDF software continues to throw errors, use the WPS Office PDF Toolkit to seamlessly combine scanned documents, standard PDFs, and images into a single file with just a few clicks.
- 1. Open WPS Office: Launch WPS Office on your computer and click on the 'PDF' tab located in the left-hand navigation pane of the home screen.
- 2. Access the Merge Tool: Click on 'Merge PDF' from the PDF toolkit dashboard to open the document combination window.
- 3. Add Scanned Files: Click the 'Add Files' button and select all the scanned PDFs you want to combine. You can drag and drop them to rearrange their order.
- 4. Merge and Save: Click the 'Merge' button at the bottom right. Once the process is complete, choose a destination folder to save your newly combined PDF file.
Frequently Asked Questions
Why does my scanned PDF say 'Secured' and prevent combining?
A 'Secured' label indicates that the author or the scanning hardware applied restriction policies to prevent editing or document assembly. You must open the file's Security properties and enter the permissions password to unlock it before merging.
Can file corruption prevent scanned PDFs from merging?
Yes. If a PDF has unusual structural elements or the scanning process was interrupted, the file might still open in a basic viewer but fail during complex operations like merging. Re-saving the file using a virtual PDF printer can fix these structural issues.
Can I combine a scanned image-based PDF with a standard text-based PDF?
Yes, standard PDF editors allow you to mix scanned image-based PDFs with text-based PDFs. If you encounter errors when mixing types, ensure neither file is encrypted and both are saved using compatible PDF version standards.
