This article describes how to convert PNG to PDF using tools that are readily available on Windows and Mac. It also looks at how to do this in Photoshop or how to use online tools everywhere.
How to Convert PNG to PDF Very Easily and Easily
Windows has a default virtual printer called Microsoft Print to PDF that allows you to easily convert PNG to PDF in a few clicks. The steps below will work with any image file and any program that has a Print function. You can also use it via the Print command in the context menu.
Select the PNG file and right-click to choose Print from the context menu.
Select Microsoft Print to PDF as your printer and click Print.