NetGalley accepts EPUB and PDF files for digital review copies. For audiobooks, files should be delivered to NetGalley as a zip file with mp3s inside. Click here for more about audiobook files.
EPUB and PDF files can be uploaded directly through your account during title setup, or through the Deliver Files page at any time. Audiobook files can be uploaded via the Deliver Files page exclusively.
NetGalley does have file size requirements, primarily related to making the file web-optimized so that readers can download the file quickly and will render well on most devices and tablets. You can find information about how to optimize your files (ePub, PDF/ePDF) here.