Format guide
XLSX
Microsoft Excel Spreadsheet
XLSX is the spreadsheet format Excel has used since 2007, like DOCX, it's a zip containing XML for cells, formulas, formatting, and embedded objects. Replaces the older binary .xls format. Read and written by Excel, Google Sheets, Apple Numbers, and LibreOffice Calc, with high fidelity for standard cell data and reasonable fidelity for complex formulas and pivot tables.
How to open a XLSX file
Microsoft Excel, Google Sheets, Apple Numbers, LibreOffice Calc. CSV is a more portable format if you only need the raw cell values.
Primary use
Spreadsheets with formulas, formatting, multiple sheets.
Convert other formats to XLSX
Convert XLSX to other formats
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