Fix PDF Text Displaying as Boxes or Squares in Acrobat
Question details
The user needs to troubleshoot and resolve an issue where text within a PDF file renders as unreadable square boxes or empty rectangles instead of proper letters.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Opening and attempting to read a downloaded or received PDF document.
- Observed behavior
- The text does not render correctly, displaying empty rectangles or boxes because the PDF viewer fails to load or recognize the corresponding font glyphs.
Download and open a known working sample PDF from a different source to verify whether the problem is specific to a single corrupted file or a system-wide font rendering issue.
Repair Acrobat Installation and Adjust Font Preferences
Use this method to fix widespread font display issues by forcing Acrobat to repair its font directory and bypass conflicting local system fonts.
This issue is typically caused by missing font glyphs or a conflict between the fonts embedded in the document and the local fonts installed on your operating system.
Open Adobe Acrobat, navigate to the top menu bar, click on 'Help', and select 'Repair Installation' (available on Windows). Wait for the process to complete and restart the application.
If the issue persists, go to 'Edit' > 'Preferences' (or 'Acrobat' > 'Preferences' on a Mac). In the left-hand category pane, select 'Page Display'.
Locate the 'Rendering' section on the right side. Check or uncheck the 'Use Local Fonts' option, then click 'OK'. Changing this forces Acrobat to switch between relying on the system fonts and exclusively using the document's embedded fonts.
Open and Render PDFs Flawlessly with WPS PDF
If your current PDF reader struggles with missing glyphs or corrupt fonts, try using WPS PDF. It features a robust built-in font rendering engine that accurately displays standard and complex PDF documents precisely as they were formatted, eliminating unreadable boxes.
- 1. Download WPS Office: Download and install the free version of WPS Office from the official website.
- 2. Launch the PDF Viewer: Open WPS Office and navigate to the 'PDF' tab on the main home screen.
- 3. Open your problematic document: Click 'Open PDF' and select the file that previously displayed square boxes to view it with accurate font rendering.
Frequently Asked Questions
Why do some PDFs show square boxes instead of text?
This happens when the PDF reader cannot locate the font used to create the document, or the specific font file does not contain a character glyph for the text being displayed. It results in the software drawing a default empty rectangle as a placeholder.
How do I embed fonts in a PDF to prevent missing text issues?
When creating or saving a PDF from programs like Microsoft Word or design software, go to the application's export options or preferences. Look for a setting labeled 'Embed all fonts' or 'ISO 19005-1 compliant (PDF/A)' and ensure it is checked before saving.
Does changing the 'Use Local Fonts' setting fix all PDF font errors?
Not always. Disabling 'Use Local Fonts' forces the reader to use only the fonts embedded in the file rather than substituting them with your system fonts. This fixes conflicts but won't solve the issue if the fonts were never embedded and your system doesn't have them either.
Can I use another application to read a PDF if the text is broken?
Yes. If a specific PDF consistently displays errors, opening it in an alternative reader like WPS PDF or dragging it into a modern web browser can help you determine if the file itself is corrupt or if the issue is strictly isolated to your default PDF viewer.
