Hi Zyad,
Welcome to the XD community!
Yes. Website sized artboards can be converted into PDF. You can create PDF for any of the artboard you have created. You've to select the artboard, File -> Export -> Selected/All artboards -> Select PDF format from dropdown.
Please see this article for more info:-https://helpx.adobe.com/xd/help/export-design-assets.html#pdf
Let us know if that helps.
Thanks,
Harshika