Be careful. Today, there was a big "Start Download" with directions to download, install, start. This is a misleading, commercial link. To use the free service, click on "Chooose PDF/Browse" then "Convert" . On next page, click "View" and "Download". For converting topo maps, I found 150 dpi too coarse, but 300 dpi was good enough.
Great site. Cloud based app does what it promises. Maximum dpi output is at 300, which is somewhat good. The only thing I would change is maybe adding higher dpi output. But the jpg image is clean. Overall I rate at 5 stars.