Verso Language Bahasa Indonesia Català Čeština Dansk Deutsch Eesti English Español Euskara Filipino Français Gaeilge Galego Hrvatski Íslenska Italiano Kiswahili Latviešu Lietuvių Magyar Malti Nederlands Norsk Polski Português Română Shqip Slovenčina Slovenščina Suomi Svenska Tiếng Việt Türkçe Ελληνικά Български Македонски Русский Српски Українська עברית اردو العربية فارسی हिन्दी বাংলা தமிழ் ไทย 한국어 中文 日本語 Move your library over Verso reads the CSV exports of the usual suspects. There is no format to pick — columns are matched by name, and afterwards you get a report naming every row that was skipped.
None of this needs an account: the import lands in the library on your device. You only sign in if you want to sync across devices or share a shelf.