Document
What is a .xlsx file?
An .xlsx file is a Microsoft Excel workbook — the standard spreadsheet format since 2007.
This extension has been used by more than one format
3 different formats have claimed .xlsx over the years, so two files with the same extension aren't necessarily the same kind of thing.
How to open a .xlsx file
- WindowsExcel
- WindowsLibreOffice Calc
- WindowsGoogle Sheets
- MacNumbers
- MacExcel
How to convert a .xlsx file
- Save As .csv for a plain data table, or .pdf for sharing.
MIME type
When a .xlsx file travels over the web, servers label it with one of these MIME types:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheetapplication/vnd.openxmlformats-officedocument.wordprocessingml.documentThe technical record
For archivists, developers and the merely curious: these are the PRONOM registry entries for .xlsx.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| Microsoft Excel for Windows | 2007 onwards | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet | fmt/214 |
| Microsoft Office Encrypted Document | 2007 Onwards | — | fmt/494 |
| XLSX Strict OOXML Spreadsheet | 2007 onwards | application/vnd.openxmlformats-officedocument.wordprocessingml.document | fmt/1828 |