How to open a .xlsx file: without installing anything

How to open a .xlsx file

A .xlsx is a XLSX file: Excel's workbook: several sheets, formulas, formatting. Excel, Google Sheets, Numbers, LibreOffice Calc, any text editor open it. Or drop it below: it opens and converts in your browser, nothing to install.

Drop files here or click to chooseSeveral files at once are fine.

🔒 Nothing is uploaded. Check the Network tab of your browser: it stays empty.

Three ways to open it

Drop the .xlsx file above: it opens and converts right here, nothing to install.
For a desktop app: Excel, Google Sheets, Numbers, LibreOffice Calc, any text editor.
If it still will not open, convert it to CSV, that is what most people are really after.

Convert a .xlsx

XLSX → CSV XLSX → TSV XLSX → XLS XLSX → ODS XLSX → JSON XLSX → NDJSON XLSX → YAML XLSX → XML

Questions

What program opens a .xlsx file?

Excel, Google Sheets, Numbers, LibreOffice Calc, any text editor. Or drop it here, without installing anything.

Why won't my .xlsx open?

Either the viewer does not know XLSX (excel's workbook: several sheets, formulas, formatting.), or the file is damaged or misnamed. Converting to CSV fixes the first case.

Is it safe to open a .xlsx here?

Yes: the file is read in your browser and never leaves your device.