i2pdf (image to pdf) is a fast and compact application built to create PDF documents from a collection of images, typically scanned from a paper source or in form of digital photographs. i2pdf allows control over the final quality and size of the images stored inside the PDF. Supports JPG, PNG, BMP, GIF and TIFF file formats.
Note multi page / multi-frame formats are not supported (for example, multi-page TIFFs or animated GIFs). Additionally, transparency data is not preserved whether a PNG or GIF file.
NOTE: The i2pdf homepage is gone — linking to Archive.org and Softpedia.