KyBook is one of the best ebook readers for iOS. It supports all major ebooks and formats, like EPub, FictionBook (fb2, fb2.zip), PDF, DjVu, Comic Book (cbr, cbz, cbt), MobiPocket and Kindle (mobi, azw3), Audio Book (mp3, m4a, m4b), etc. You can find more features of KyBook ebook reader app here. If you have saved many books on your PC, you can transfer them to KyBook on your iPhone or iPad so you can enjoy reading anywhere on the go. It is very easy to do that.
Mac users can make use of AirDrop for the book transfer from computer to iPhone iPad, then open them using KyBook reader app on the iOS device. Just make sure your Mac and iPhone are connected to the same Wi-Fi network. Then find the book files in Finder, right click on them, select Share from the context menu, then choose AirDrop > iPhone/iPad. You will get a prompt on your iOS device with all compatible apps to open the received books, select KyBook from the app list, the books will be saved to KyBook Library. There will be an Inbox folder in KyBook Library to save all imported books.
If you are also a Calibre user, you can start its Content Server on your PC or Mac, then access Calibre Library from Safari browser.
From the program’s top menu bar, click the “Connect/share” button, and then select “Start Content Server” from the submenu. You will get the local IP address of your PC or Mac in the local network. Calibre will now run as a content server, with all the eBooks in your library being made available to other devices in the same local network. You can access Calibre Content Server from other devices using a web browser, such as Safari, Chrome, Firefox, etc. Also make sure to include the port number, which is 8080, in the address.
You can browse through Calibre Library, choose Calibre books, download them to the Files app on your iPhone or iPad. You can find more details from these steps to transfer Calibre books to iPhone iPad. They will be saved to the Downloads folder in Files app. You can find them in Files, select and copy them to On My iPhone > KyBook folder. Run the KyBook reader on iPhone or iPad, open the Library to find the books.
Other that AirDrop and Calibre, there are many third-party file transfer apps can help us copy files from computer to iPhone iPad, such as Zapya file transfer. You can refer to this guide to send files from PC to iPhone using Zapya.