Windows allows you to convert any image file with JPG, JPEG, PNG format to PDF without installing any third-party software via Windows Photos App.

Three free software to extract images from PDF files. Download Some PDF Image Extract, Nitro PDF Reader or PDFMate PDF Reader covered here.

To convert a JPG file to a PDF file, simply change the file format on your computer's default photo-viewing app.

In the Preview app, for example, it's possible to create a single multi-page PDF document out of several separate image files.