Fix Acrobat Combine Files Feature Not Working on Windows 10
Question details
The user is unable to merge PDF files because the Combine Files feature has stopped responding.

- Product
- Adobe Acrobat DC Pro
- Device & OS
- Windows 10
- Scenario
- Attempting to merge two open PDF documents into a single file after the application's built-in repair tool failed to resolve the unresponsiveness.
- Observed behavior
- The Combine Files tool in Acrobat is completely unresponsive and fails to merge the documents.
Save your currently open PDF documents and perform a quick restart of your Windows 10 computer to clear any temporary background processes that might be freezing Acrobat.
Combine via Windows Explorer and Isolate Corrupt Files
Bypass the in-app Combine Files button using the Windows context menu, and test with previously working files to identify document-specific corruption.
Often, the Combine Files feature freezes not because of an application error, but because one of the specific PDF files being merged is corrupted, improperly formatted, or restricted by security settings. Isolating the files will help identify the root cause.
Open Windows Explorer, select the multiple PDF files you wish to merge, right-click the selection, and choose 'Combine files in Acrobat'.
If the context menu method fails with the current files, select two different PDF files that you successfully combined in the past and attempt to merge them.
If the known working files merge successfully, the issue lies with your new PDFs. Open each problematic PDF individually to check for error messages, corruption, or unusual content.

Use Adobe Acrobat Cloud to Combine PDFs
If the desktop application remains unresponsive, use the web-based version of the tool to quickly merge your documents without relying on local software.
Combine PDF Files Seamlessly with WPS Office
If Adobe Acrobat continues to freeze or fails to merge your documents, WPS Office offers a powerful and lightweight built-in PDF toolkit. You can easily combine, split, and edit your PDF files without experiencing unresponsiveness.
- 1. Open WPS Office: Launch WPS Office on your Windows 10 computer and click on the 'PDF' tab on the home screen.
- 2. Access the Merge Tool: Navigate to the 'Tools' menu at the top and select the 'Merge PDF' option.
- 3. Add Your PDF Files: Click 'Add Files' in the dialog box to select the PDF documents you want to combine from your local drive.
- 4. Merge and Save: Arrange the files in your desired order, click 'Merge', and save the newly combined PDF document to your computer.

Frequently Asked Questions
Why does Acrobat freeze when trying to combine PDFs?
Acrobat may freeze if one of the PDF files is corrupted, contains complex elements that fail to render, or has security restrictions enabled that prevent document assembly.
How do I know if a specific PDF is causing the combine feature to fail?
Try combining two simple, known-working PDF files. If they merge successfully, the issue is likely isolated to the specific files you were originally trying to combine.
Does repairing Acrobat fix the combine files issue?
Repairing the installation can fix corrupted application files, but it will not resolve issues caused by corrupted PDF documents or restricted file permissions. You must isolate the files to determine the root cause.




