You can import CSV files (comma separated values) to Cardfile.it. These files can be easily exported from Microsoft Excel, Google Sheets and many other programs.
Cardfile.it expects your data to be in following format. The first row represents the header with the column names. Each subsequent row represents a single record. Content of the first column is used as the record title. Example:
Name, Year of birth, Instruments
Ian Anderson, 1947, Vocals Flute
John Cale, 1942, Vocals Keyboards Viola