Here's a simple, free, and quick way to combine single images into a unique pdf if you have Mac OSX with Automator (it's a pre-installed app, so you don't have to download any app).
There's a couple "classic" ways to do it, but most of the time you'll get a poor result if you have images with different sizes. To get started, download this workflow:
Then, here's what you have to do:
- open the workflow file (it should load Automator automatically)
- go where your images are stored, and select those you want to group
- go to the Automator window
- (optional) change the destination (default is Desktop) and change "PDF NAME" to whatever you want to name your pdf in the "New PDF from Images" box
- press "Run" (top right corner)
And you're done!
