Fix Acrobat Pro Displaying Unreadable Text or Squares in PDFs
Question details
The user is encountering an issue where unreadable text or square characters appear in PDF files and application menus instead of normal letters.
- Product
- Adobe Acrobat Pro and Reader
- Device & OS
- not provided
- Scenario
- Viewing a PDF document or navigating the Acrobat application menus.
- Observed behavior
- Text fails to render correctly, displaying as unreadable symbols or blank square boxes due to font availability or embedding issues.
Before troubleshooting, check if the issue occurs in only one specific PDF or across all documents, and temporarily disable any third-party font management software running on your computer.
Check for Embedded Fonts in the PDF Document
Determine if the document uses fonts that are not embedded, causing the system to substitute missing characters with squares.
PDF files rely on embedded fonts to display text exactly as the author intended. If a font is not embedded and you do not have it installed on your local computer, the PDF reader will attempt to substitute it. When substitution fails, the characters are rendered as empty squares or unreadable symbols.
Launch Adobe Acrobat or Reader and open the problematic PDF file. Click on 'File' in the top menu, then select 'Properties' (or press Ctrl+D / Cmd+D).
In the Document Properties dialog box, click on the 'Fonts' tab to view a list of all fonts used in the document.
Examine the list of fonts. Look for the words '(Embedded)' or '(Embedded Subset)' next to each font name. If these words are missing, the font is not embedded.
If fonts are not embedded, you must either install the missing fonts on your computer's operating system or ask the original creator of the document to re-export the PDF with all fonts properly embedded.
Verify and Restore Missing System Fonts
If Acrobat's menus and user interface are displaying squares, a required system font may have been deleted or disabled.
Read and Edit PDFs Flawlessly with WPS Office
If you continue to experience font display and rendering issues in your current PDF reader, WPS Office provides a robust, lightweight PDF reader and editor that accurately renders standard and embedded fonts without compatibility glitches.
- 1. Download WPS Office: Visit the official WPS website to download and install the free WPS Office suite.
- 2. Open Your PDF: Right-click the problematic PDF file showing square characters and select 'Open with' > 'WPS Office'.
- 3. View and Edit Seamlessly: Read your document with WPS PDF's advanced rendering engine, ensuring all text and fonts display exactly as intended.
Frequently Asked Questions
Why do my PDFs show squares instead of text?
Squares appear when the original fonts used to create the document were not embedded in the PDF file, and your device does not have those specific fonts installed. The PDF reader tries to substitute them but fails, resulting in unreadable blocks.
Can a font manager cause text display issues in PDFs?
Yes, third-party font managers can sometimes disable, override, or remove essential system fonts required by PDF applications, causing both document text and application menus to display as unreadable symbols.
How do I ensure fonts are embedded when creating a PDF?
Fonts must be embedded when the PDF is originally exported. In the source application (such as Word, PowerPoint, or InDesign), check the PDF export options or preferences to ensure the 'Embed fonts in the file' setting is selected before saving.
Are square characters a sign of a corrupted PDF?
Not necessarily. While severe file corruption can cause unreadable text, square characters almost always point to a missing font, unembedded font subset, or an encoding issue rather than permanent file damage.
