Import a roster
Drop in a screenshot of your raid window or your roster spreadsheet. Names are read with OCR and classes are taken from the pixel colours, so a raid frame classifies itself. Nothing is written to the roster until you have checked the rows below.
From a screenshot
Works with the in-game raid window (class-coloured names, several columns) and with a spreadsheet screenshot (one player per row, class written out).
From text
Paste anything roughly one player per line: Bjarne - Warrior - Prot - MT, or a CSV export with a header row.