You can bring in a CSV export from Chrome, Edge, Firefox, Brave, Bitwarden, or Norton Password Manager — find this under the vault window's Manage menu, or ☰ menu → Import passwords (.csv)…. You can also export your Vodou vault to a CSV file the same way, behind a plain-text warning — a CSV export is not encrypted, so treat the file carefully once it exists on disk.
A row whose site and username already match a saved login is skipped automatically — importing the same file twice, or a file that overlaps your existing logins, won't create duplicates. The import summary tells you how many logins were added versus skipped.