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Fix "Unknown Document Property Name" Error When Exporting Word to PDF
Question details
The user encounters an unknown document property error appearing at the bottom of pages when converting a document to PDF.
- Product
- Word
- Device & OS
- not provided
- Scenario
- Exporting or saving a Word document as a PDF file.
- Observed behavior
- An error message reading "Error! Unknown document property name" appears at the bottom of exported PDF pages, despite no footer text being visible in the original document.
Ensure you have saved a backup copy of your original document before modifying or unlinking any field codes, so you can easily revert changes if necessary.
Reveal and Unlink Invalid Field Codes
Use keyboard shortcuts to display hidden field codes and unlink the invalid properties causing the PDF export error.
During PDF conversion, Word automatically attempts to update all document fields. If a field in your header or footer references a property that has been deleted or corrupted, it will throw an error even if the text was invisible.
Open your document and press "Alt + F9" on your keyboard. This action reveals all hidden field codes within the document, including those located in the header or footer.
Scroll down to the footer area on the pages where the error usually appears. Look for the broken field code that represents the missing document property.
Select the problematic field code and press "Ctrl + Shift + F9". This shortcut unlinks the field, permanently converting it into static text or removing the broken reference.
Press "Alt + F9" again to hide the field codes. Save your document, then attempt to export it to PDF again to verify the error is resolved.
Copy Content to a New Blank Document
If unlinking field codes does not work, moving your text to a fresh document can leave corrupted footer data and broken properties behind.
Export Documents to PDF Flawlessly with WPS Office
WPS Office provides a built-in, highly compatible PDF converter that seamlessly handles document properties, headers, and footers without throwing unexpected formatting errors.
- 1. Open the document in WPS Writer: Launch WPS Office and open the Word document you want to convert to PDF.
- 2. Access the PDF Export tool: Click on the "Menu" button in the top left corner, hover over the "Export to PDF" option, and select it.
- 3. Configure and save: Adjust your PDF export settings in the prompt, click the "Export to PDF" button, and save your new file effortlessly without footer errors.
Frequently Asked Questions
Why does the "Unknown document property name" error only show in the PDF?
This happens because exporting to PDF acts similarly to a print command. It triggers the word processor to update all dynamic fields (like page numbers or custom document properties) before saving. If a field references a property that no longer exists, the error is generated precisely during this export process.
What does the Ctrl+Shift+F9 shortcut do?
The Ctrl+Shift+F9 keyboard shortcut unlinks a field code. It permanently converts dynamic, updating fields into normal, static text, which stops the software from attempting to update broken or missing links.
How can I prevent hidden field code errors in the future?
To avoid these errors, clear formatting when pasting content with complex fields from other documents. You can also disable the "Update fields before printing" option in your application settings, as this stops the software from checking fields during PDF export.
Can I simply delete the footer to fix this issue?
Yes. If you do not need headers or footers, you can double-click the footer area, select "Remove Footer", and save the document. This will delete any hidden invalid fields residing within the footer space entirely.
