How to Fix Adobe PDF Printer Calibri Bold Invalid Font Errors
Question details
The user is unable to successfully print full emails to PDF due to a PostScript error indicating a missing Calibri Bold font.

- Product
- Adobe PDF Printer / Acrobat Distiller
- Device & OS
- not provided
- Scenario
- Printing an email to PDF through a web browser (Firefox) and an email client (Zimbra).
- Observed behavior
- The print job fails, creating only a one-page PDF alongside a Distiller log that reports the Calibri-Bold font is missing, followed by an invalidfont PostScript error.
Verify that the Calibri font family is properly installed on your computer by checking the system's Fonts folder, and try restarting your web browser before attempting to print again.
Adjust Adobe PDF Printer Font Settings
Disable the setting that forces Adobe PDF Printer to rely only on system fonts, allowing it to process the document fonts correctly without throwing an error.
By default, Adobe PDF Printer may attempt to use system fonts rather than the fonts embedded in the document. If there is a mismatch or corruption with the Calibri font, disabling this preference forces Distiller to process the font data directly from the source application.
Open the 'Control Panel' on your computer and navigate to the 'Devices and Printers' or 'Printers & scanners' section.
Right-click on the 'Adobe PDF' printer and select 'Printing preferences' from the context menu.
Navigate to the 'Adobe PDF Settings' tab. Uncheck the box labeled 'Rely on system fonts only; do not use document fonts'.
Click 'Apply' and then 'OK' to save your changes. Return to Firefox and attempt to print your Zimbra email to PDF again.

Reinstall the Calibri Font Family
Reinstall the Calibri font to ensure the bold variant is not corrupted or missing from the system registry.
Use WPS Office to Effortlessly Convert Documents to PDF
Avoid complex Distiller logs and PostScript errors by using WPS Office. Its built-in PDF converter natively supports accurate font embedding, ensuring your documents and emails look exactly as intended without needing third-party virtual printers.
- 1. Install WPS Office: Download and install WPS Office on your computer.
- 2. Import Your Content: Open your document or paste the text of your email directly into WPS Writer.
- 3. Export to PDF: Click the 'Menu' button in the top-left corner and select 'Export to PDF' from the dropdown list.
- 4. Save the File: Adjust your desired export settings and click 'Export' to save your file smoothly without font errors.

Frequently Asked Questions
What does the 'invalidfont PostScript error' mean when printing to PDF?
This error occurs when Acrobat Distiller encounters a font in the source document that it cannot properly locate, map, or process. The print job gets aborted, resulting in an incomplete PDF and a log file detailing the failure.
Why is Calibri Bold specifically missing in the Adobe Distiller log?
The Calibri Bold font might be corrupted in your system's font folder, or the source application (like Firefox) is not sending the correct font data to the Adobe PDF virtual printer. Adjusting the printer to not rely strictly on system fonts typically fixes this.
Can I print an email to PDF without using the Adobe PDF Printer?
Yes. Modern web browsers like Firefox, Chrome, and Edge have a built-in 'Save to PDF' feature available directly in their print dialogs. Selecting this native option often bypasses PostScript virtual printer errors entirely.




