I wrote a thumbnail generator server. You give it a file, and it gives you back a thumbnail. Supports images, videos, music, 3D models, PDFs, ebooks, documents, spreadsheets, presentations, text, fonts, HTML, and more.

This is really only going to be useful to people writing their own apps. You wouldn’t use this as an end user.

If it’s missing any file types that could conceivably have a thumbnail generated for them, let me know. Maybe I can add that type too. I want it to basically be able to thumbnail everything. I know that’s a lofty goal, but the closer I can get the better. :)