How can I convert a PDF or TIFF files to a useable format on Collage.com?

Collage.com accepts photos in jpg or png format only. Images must be under 10MB in size and under 8000x8000 in resolution. Here are some useful resources on how to convert your images so that they're compatible with Collage.com: 

PDF to JPG Conversion

http://pdf2jpg.net/

TIFF to JPG Conversion

http://www.zamzar.com/convert/tiff-to-jpg/