If using the Save As dialog box in Word (F12) and choosing PDF for file format does not work, try adding one of those PDF converters which install as virtual printers. PrimoPDF would be one example. Convert to PDF by printing the document to the PrimoPDF printer.

Note that even if you are able to successfully create a PDF without margins, most physical printers can't print to the very edge of the page.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional