Recently I came across the need to convert images to PDF. I was browsing the web to search for free tools, but I thought it would be a fun idea to just create my own tool for this. In the mean time I could dust off my PHP-skills, which have been lying around for years now.
The tool offers you the possibility to upload images from PC or smartphone/tablet, select some options (paper format, direction and margins) and to convert those images to a downloadable PDF.
Go check it out here: PDFifier Online