Interchange can load e-books/office documents into Kindle or iBooks readable format and push them directly to Kindle. Editable eBook metadata (title author description language ISBN ASIN...)

1 support a variety of formats txt epub mobi azw azw3 prc html htm...
2 multiple formats are converted to each other the directory is kept the metadata is retained and the format is perfect.
3 automatically extract the txt directory generate an e-book with a directory
4 can edit the metadata of the e-book you can modify the author title language ISBN ASIN... follow-up will support the setting of the cover.
5 can rename delete select open mode send mail etc.