A family of Microsoft word processing software products for creating web, email, and print documents.
Hi Adam,
Welcome to the Microsoft Community.
Microsoft Word itself does have the ability to save documents as PDFs, but Word's primary function is word processing, not creating complex fillable forms. While Word can create basic form fields, the fillability of these fields may be lost when converted to PDF because Word's PDF export feature does not support all of the advanced form features.
Adobe Acrobat is a professional PDF tool developed by Adobe and designed specifically to work with PDF files, including the creation and editing of fillable forms. The PDF format itself was invented by Adobe, so Acrobat is better able to handle the complex features of PDF files, such as form fields, digital signatures, and scripts.
While Word can handle basic form creation, Adobe Acrobat is a better choice for scenarios that require advanced features such as customized forms and greater compatibility.
Please refer to Create a fillable PDF from Word or Google Docs | Adobe Acrobat
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I hope this is useful and please feel free to ask any questions.
Best regards,
Ian - MSFT | Microsoft Community Support Specialist