Fix PDF Text Changing to Symbols When Saving in Adobe Acrobat
Question details
Users experience text transforming into strange symbols or square boxes after editing and saving a PDF file.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Editing existing text in a PDF document and subsequently saving the file.
- Observed behavior
- Instead of saving the edited text, the characters are replaced by unusual symbols or rectangular shapes known as 'tofu boxes' due to missing or unembedded fonts.
Make sure the specific fonts used in the original document are installed locally on your computer before attempting to fix or re-save the PDF file.
Embed Fonts Using Acrobat Preflight Tool
Use this method if you have Adobe Acrobat Pro and need to embed fonts directly into the existing PDF file.
Adobe Acrobat Pro includes a specialized Print Production toolset that can identify missing elements and forcibly embed fonts, provided those fonts exist on your local system.
Launch Adobe Acrobat Pro, open your problematic PDF, and navigate to 'Tools' > 'Print Production'.
Click on 'Preflight' from the right-hand pane menu.
In the Preflight dialog box, search for 'Embed missing fonts', select the fixup profile, and click 'Analyze and fix'.
Save the file when prompted. The text should no longer revert to tofu boxes upon editing.
Embed Fonts When Exporting from the Source Document
Use this method if you lack Acrobat Pro but still have access to the original source file (like a Word document).
Edit PDFs Effortlessly with WPS Office
If you are struggling with font compatibility and corrupted symbols in your PDF documents, try the built-in WPS PDF Editor. It provides a robust, lightweight environment to safely modify PDF text and graphics without breaking original font encodings.
- 1. Open the PDF: Launch WPS Office and open your existing PDF document.
- 2. Enter Edit Mode: Navigate to the 'Edit' tab and click 'Edit Text' to start modifying your document.
- 3. Make Your Changes: Type or delete text as needed; WPS PDF automatically handles local font mapping.
- 4. Save the PDF: Click 'Save' or press Ctrl+S. The document will preserve your changes flawlessly with the correct typography.
Frequently Asked Questions
What is a 'tofu box' in a PDF document?
A 'tofu box' is a rectangular, blank square symbol that appears in digital text when a system or application lacks the necessary font software to render a specific character.
Why does the PDF text look fine until I try to edit it?
When a PDF is created, fonts can be converted into vector shapes rather than embedded as actual text data. They look correct visually, but once you attempt to edit the text, Acrobat needs the actual font file to generate new letters. If the font is missing, it substitutes strange symbols.
Can I fix missing PDF fonts if I don't have Adobe Acrobat Pro?
Yes. The most effective way is to reopen the original source document (such as a Word file), ensure the correct fonts are installed on your PC, check 'Embed fonts' in the export options, and generate a new PDF.
