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How to Fix File Conversion Errors When Combining PDFs in Acrobat Mobile
Question details
The user is unable to combine multiple files in Acrobat Reader Mobile due to a file conversion error prompt.
- Product
- Adobe Acrobat Reader Mobile
- Device & OS
- iOS
- Scenario
- Attempting to merge multiple PDF files into a single PDF document using the mobile app.
- Observed behavior
- The app fails to merge the selected files and displays an error indicating that the files cannot be converted.
Before troubleshooting, verify that the files you are trying to combine are standard PDF documents and are not corrupted. Also, ensure your Acrobat Reader Mobile app is updated to the latest version.
Remove Password Protection and Digital Signatures
Password-protected or digitally signed PDFs are restricted and cannot be merged directly in Acrobat Mobile. Removing these restrictions is usually the fastest fix.
PDF documents that carry encryption, passwords, or digital certificates are locked by design to prevent unauthorized modification. When Acrobat Mobile attempts to combine them, it triggers a conversion error because it lacks the permission to alter the file structure.
Open each PDF file individually to see if a password prompt appears. Note which files require authentication.
Transfer the protected file to a desktop computer. Open it in a PDF editor, navigate to File > Properties > Security, and change the Security Method to 'No Security'. Enter the password when prompted to confirm.
If the document has a digital signature, open it on a desktop, select 'Print', and choose 'Print to PDF' or 'Save as PDF' to flatten the file and remove the cryptographic signature.
Transfer the unprotected, flattened files back to your mobile device and attempt to combine them again in Acrobat Mobile.
Gather Diagnostic Information for Adobe Support
If your files are not protected but the conversion error persists, collect app and device information to report the bug to Adobe Support.
Combine PDFs Easily with WPS Office
Avoid frustrating file conversion errors by using WPS Office. Its powerful PDF toolkit allows you to merge, edit, and manage PDF files seamlessly on both mobile and desktop devices without compatibility hiccups.
- 1. Open WPS Office: Launch the WPS Office app on your mobile device or desktop computer.
- 2. Access PDF Tools: Navigate to the 'Tools' tab and select 'Merge PDF' from the comprehensive PDF toolkit.
- 3. Add Your Files: Select the PDF files you want to combine from your device storage or cloud drive.
- 4. Merge and Save: Arrange the files in your desired order and tap 'Merge' to instantly create a single, unified PDF document.
Frequently Asked Questions
Why does Acrobat Mobile say my files cannot be converted when combining?
This error usually occurs if one or more of the selected PDF files are encrypted with a password, protected by a digital certificate, or corrupted. Acrobat Mobile restricts the merging of secured documents to prevent unauthorized modifications.
Can I combine PDFs on my phone without an Adobe subscription?
Yes, while Acrobat requires a premium subscription to combine files, you can use other mobile apps like WPS Office to merge documents quickly and easily right from your smartphone.
How do I remove a digital signature to merge a PDF?
The easiest workaround is to open the digitally signed PDF on a desktop computer, select 'Print', and choose 'Print to PDF' or 'Save as PDF'. This flattens the document, removing the signature's background encryption, and allows it to be merged with other files.
How do I find my Acrobat Reader Mobile version on iOS?
Open the Acrobat Reader app, tap on your 'Profile' icon in the top corner of the screen, and select 'About Adobe Acrobat'. The app version will be displayed clearly on this page.
