--- title: I can't upload my book or cover, I receive error messages description: The book upload panel accepts epub (ebook format) and docx files. If you don't have an epub file, read this article. Ebook validation is an internationally approved process of checking the code within --- [Skip to content](https://help.publishdrive.com/i-cant-upload-my-book-or-cover-i-receive-error-messages#main-content) English Show submenu for translations [More support](https://help.publishdrive.com/kb-tickets/new?hsLang=en) ![pd-white.png\]](https://help.publishdrive.com/hs-fs/hubfs/pd-white.png?height=38&name=pd-white.png) Open main navigation Close main navigation - English Show submenu for translations - [More support](https://help.publishdrive.com/kb-tickets/new) - Go to publishdrive.com Go to publishdrive.com Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [PublishDrive Help Center](https://help.publishdrive.com/?hsLang=en) 2. [Book Upload And Correction](https://help.publishdrive.com/book-upload-and-correction?hsLang=en) 3. [Book Correction And Common Errors](https://help.publishdrive.com/book-upload-and-correction?hsLang=en#book-correction-and-common-errors) # I can't upload my book or cover, I receive error messages ### First upload (epub) The book upload panel accepts epub ([ebook format](https://help.publishdrive.com/the-epub-format-advantages-and-limitations?hsLang=en)) and docx files. If you don't have an epub file, [read this article](https://help.publishdrive.com/i-dont-have-an-epub.-what-can-i-do?hsLang=en). ### Subsequent uploads (epub) Ebook validation is an internationally approved process of checking the code within the books to make sure that they display well on all kinds of devices. The ebook stores only accept "valid" ebooks: your book might look OK on your computer and doesn't work on another device. Ebook validation is here to make sure that all books work on all devices correctly. When you re-upload a book, you can immediately see validation results: this is to make sure that nobody accidentally overwrites a right file with an invalid file. As we automatically send your changes to the stores, your re-uploaded ebook file must be perfect. Solutions of most common validation errors can be found [here](https://help.publishdrive.com/book-upload-and-correction?hsLang=en), but we're more than happy to help if you get stuck. ### Cover image The cover image should be a jpg or png file and at least 800 x 1280 pixels. 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