i2pdf (image to pdf) is a free and portable app to create a PDF from multiple images.
You only need to extract the files and run the executable. Drag-and-drop is supported, so adding images is simple. You can select or deselect some or all images to create multiple PDF documents if you want.
Click on Build PDF to select your options in four different categories; PDF Creation, Text, Thumbnail, and General. The one thing missing is a preview option, so you may have some trial and error to get your PDf the way you want.
Finally, name and save your PDF. For our tests, we decided to leave all of the settings alone to see if the PDF would align our three images in a way that would look nice. It did, and we were impressed. Check out our third screenshot below.
You can always go back and add compression, formatting, text, thumbnail size and alignment, and more. A log file can be found on your Desktop so you can track what changes you made initially.
i2pdf (image to pdf) is a nice, free way to add many images to a PDF document. It hasn't been updated in years but worked flawlessly on Windows 10. We think you'll be impressed.