The e-book format and video convertors can help convert different file format into a format that can be used by the iPad. The following factors need to be considered when choosing these tools: 1 supported format: The translator should be able to support the required file format for reading or viewing on the iPad. Speed: The translator should be able to quickly convert the file format to ensure that it can be used when needed. Function 3: The translator should have some advanced functions such as adding background music or adjusting the image quality. Based on the above factors, I can recommend the following tools to you: 1 iBooks Translator:iBooks is a well-known e-book application that can convert a variety of file format into a format supported by iBooks. The translator also supports adding video and audio files to e-books. 2. Android Air: Android Air is a tool for creating and playing e-books on the iPad. It can convert a variety of file format to the format supported by the Adobe Air and support the addition of video and audio files to e-books. 3. Fowler's Nest iPad E-Book Convertor: Fowler's Nest iPad E-Book Convertor is a free software that can convert a variety of file format to the supported format of the iPad, including e-books and PDF-files. The translator also supports adding video and audio files to e-books. These are some of the more popular e-book format and video convertors. You can choose one according to your needs.