The International Digital Book Forum has established validation rules for epubs to ensure they adhere to industry-standard file requirements.
PublishDrive has integrated the epub validation process. Once you have uploaded your epub, we automatically run the epub validation. We fix all common issues in the background. If there is anything we cannot fix, we will notify you and guide you towards the solution.
If you would like to check your ebooks without uploading them, you can do so here.
We don’t have a long formatting guide but have an example ebook you can use as a template to convert your own books (epub file to download): The Time Machine (ebook template).