We’ve been working on a project with lots of PDF files, and the download manager plugin makes use of featured images for the downloads. In the past, I’ve struggled with creating thumbnails of the first page… it had been a very time-intensive process.
Then, I found A-PDF Thumbnailer!! It made creation of the thumbnails really easy. After fiddling with it for a few minutes, I was able to create high quality, properly-sized thumbnails for a big batch of PDFs. And it’s quite a bargain at $27… it saved me hours of work.
You can download the trial version to see it in action before buying. It does even more than just creating thumbnails, but I haven’t needed to do that yet. Maybe someday. For Windows only.