Fix Square Boxes Appearing After Combining PDF Files in Acrobat
Question details
The user needs to resolve an issue where text or graphics are replaced by square boxes after combining multiple PDFs.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Merging multiple individual PDF files into a single document using the Combine Files tool.
- Observed behavior
- Individual PDF files display correctly on their own, but rendering errors in the form of square boxes appear after the files are combined.
Make sure to keep the original, individual PDF files intact and use copies for your merging tests to avoid permanent data corruption.
Update Adobe Acrobat to the Latest Version
Software bugs related to the Combine Files tool or font rendering are frequently patched in the latest application updates.
Running an outdated version of your PDF software can cause conflicts when processing complex graphic data or embedded fonts during a merge.
Launch Adobe Acrobat on your computer. Click on the 'Help' tab located in the top menu bar.
Select 'Check for Updates' from the dropdown menu to prompt the software to scan for the latest patches.
Follow the on-screen instructions to download and install any pending updates, then restart Acrobat and try combining your files again.
Identify and Recreate PDFs with Damaged Font Data
Square boxes typically indicate missing or corrupted embedded fonts in one of the source files.
Use WPS Office to Combine PDFs Without Font Errors
If you continue experiencing rendering issues like square boxes, try using the PDF Merge feature in WPS Office. It accurately preserves embedded fonts, formatting, and graphics during the combination process, ensuring your final document looks exactly like the originals.
- 1. Launch WPS Office: Open WPS Office and navigate to the 'PDF' tab on the main interface.
- 2. Select PDF Merge: Click on 'Merge PDF' from the available PDF toolkit options.
- 3. Add Your Files: Click 'Add Files' to select the individual PDF documents you want to combine.
- 4. Combine the Documents: Arrange the files in your preferred order and click 'Merge' to generate a clean, error-free PDF document.
Frequently Asked Questions
Why do square boxes appear instead of text in my PDF?
Square boxes usually appear when a font used in the original document is not properly embedded in the PDF and is not installed on the system viewing the file. The PDF viewer substitutes the missing font with default square box characters.
Does merging PDFs change their original formatting?
Generally, merging PDFs preserves formatting. However, if the source files use conflicting font encodings or contain damaged graphic data, the final merged document may struggle to render certain elements correctly.
How can I prevent missing font issues when creating a PDF?
When exporting or saving a document as a PDF from authoring software like Word or WPS Office, always check the options menu and verify that 'Embed fonts in the file' is selected to ensure cross-device compatibility.
