Converting an XLSX spreadsheet to PDF produces a paginated, print-ready document that displays the spreadsheet layout consistently across all devices and prevents recipients from modifying the underlying data. XLSX is the XML-based Open XML spreadsheet format used by Microsoft Excel; it renders dynamically depending on the viewer's screen size and installed software version, meaning the layout can shift between machines. PDF captures the exact layout as rendered by LibreOffice Calc in headless mode, including column widths, row heights, cell borders, merged cells, embedded charts, and conditional formatting colours. Each worksheet is converted to one or more pages based on the defined print area or the auto-fit page settings configured in the workbook. Formulas are fully evaluated and replaced by their computed values in the output. 1converter handles multi-sheet workbooks by converting each sheet sequentially and combining them into a single PDF document.