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How to Fix Adobe Acrobat Mobile Displaying Boxed Question Marks
Question details
The user needs to resolve an issue where certain symbols and text within a PDF document display as boxed question marks instead of readable characters.
- Product
- Adobe Acrobat Mobile
- Device & OS
- iPadOS 14.3
- Scenario
- Opening and reading a PDF document on an iPad using the Adobe Acrobat Mobile application.
- Observed behavior
- Specific text and symbols render as boxed question marks in Adobe Acrobat Mobile, despite displaying correctly in other applications like Dropbox for iOS and macOS Preview.
Ensure your iPad is connected to a stable Wi-Fi network with sufficient battery life so you can seamlessly download any required application or operating system updates.
Update Adobe Acrobat Mobile and iPadOS
Installing the latest software updates for both the app and the operating system is the most effective way to resolve missing font packages and PDF rendering bugs.
Mobile PDF readers rely on system fonts to render documents properly. When a document contains non-embedded fonts that are missing from your current iPadOS version or unsupported by an outdated Acrobat app, the characters default to boxed question marks.
Open the App Store on your iPad, tap your profile icon at the top right corner, scroll down to check for pending updates, locate Adobe Acrobat, and tap 'Update'.
Return to your home screen, open the 'Settings' app, and navigate to the 'General' menu.
Tap on 'Software Update' and select 'Download and Install' to update your iPadOS to the newest available version.
Once the updates are complete, restart your iPad, reopen Adobe Acrobat Mobile, and load the PDF document to check if the text now renders correctly.
Open the Document in an Alternative PDF Viewer
Using a different PDF reader can bypass app-specific rendering errors if the fonts are simply incompatible with Adobe Acrobat Mobile.
Read and Edit PDFs Flawlessly with WPS Office
If your current PDF reader struggles with font compatibility on mobile devices, WPS Office offers a powerful, built-in PDF viewer and editor that accurately renders standard and custom fonts across all operating systems without visual glitches.
- 1. Install WPS Office: Download and install the free WPS Office app from the Apple App Store on your iPad.
- 2. Import the Document: Open WPS Office, tap the 'Files' tab at the bottom, and browse your device storage to locate the PDF.
- 3. Open and Render: Tap the PDF file to open it in the WPS PDF Viewer, which automatically detects and applies the correct font rendering protocols.
- 4. Edit or Annotate: Once opened, use the 'Edit' or 'Annotate' tools in the bottom menu to highlight text, add comments, or make changes directly to the document.
Frequently Asked Questions
Why does my PDF display text as boxes with question marks?
This rendering issue occurs when the PDF viewer lacks the specific fonts required to display the text, or if the original creator of the PDF failed to properly embed the custom fonts into the file before exporting.
Can I manually install missing fonts into Adobe Acrobat Mobile?
Adobe Acrobat Mobile on iPad relies primarily on the system fonts provided by Apple. You cannot manually install fonts directly into the Acrobat app; updating your iPadOS is the best way to refresh and add system fonts.
How can I prevent this font issue when creating PDFs?
To ensure your document looks the same on every device, you must embed the fonts during creation. In applications like WPS Office or Microsoft Word, check your PDF export settings and enable the 'Embed fonts in the file' option before saving.
Will converting the PDF to a Word document fix the unreadable text?
Converting the PDF to a Word document (.docx) can sometimes force the system to substitute the missing custom font with a readable standard font. You can use a free converter tool in WPS Office, modify the text format, and re-export it as a PDF.
