Alchemy is an open-source converter for converting image files to PNG format, which also allows you to combine several images and save them as a PDF document. Using Alchemy is extremely easy as it supports drag & drop. The application launches in the lower right corner of the screen, where you need to place the selected image files, and then - with the available options - perform the operation of merging images into a PDF document or converting to PNG.

The tool can operate in batch mode.