XLSX converter
XLSX is Excel’s spreadsheet format. It is converted to CSV for import and to PDF for printing and sending.
Convert from XLSX
CSV or PDF
CSV is suitable for import, data exchange and scripts. PDF fixes the appearance of the table for printing and sending.
Limitations
CSV exports the first sheet, formulas become values, and formatting is lost.
Format questions
Are all sheets preserved?
CSV exports only the first sheet. PDF preserves the whole workbook as rendered by LibreOffice.
What happens to formulas?
CSV stores calculated values, not the formulas themselves.