After using the OpenKinect library to communicate with the Kinect, I had produced many PPM and PGM files that I couldn't open. Furthermore, all the applications I found that could open the files on Mac OS X were massively bloated. What I really wanted was a website that would just convert the files to PNG images. I couldn't find it, so I made this.
Drag your PPM, PGM or PBM files onto the dashed area below to convert them to PNG images in your browser. Right-click the image to save to your machine.