EPUB and MOBI
For HTML, EPUB and MOBI, pairs of files are generated: one with images, and one without. The set of files without images is intended to be friendlier to readers with limited bandwidth, or without the necessary storage space for any images included with the eBook.
After uploading, a team of human experts — known as the “whitewashers,” after a scene in Mark Twain’s “The Adventures of Tom Sawyer” — does final formatting, attaches the Project Gutenberg header and footer, and uploads the new item to the server at www.gutenberg.org.