XLSX
Excel workbook
XLSX is the Microsoft Excel workbook format since Excel 2007. One workbook can hold several sheets with formulas, formatting, charts and pictures.
Extensions: .xlsx
XLSX to CSV converter
Convert XLSX files to CSV on Windows 10 and 11: free, offline and in batches. Drag the files onto CSV in Filee's format donut and the CSV files appear next to the originals.
How to convert XLSX to CSV on Windows
- 1
Select your XLSX files
In File Explorer or on the desktop, select one XLSX file or as many as you like.
- 2
Hold Ctrl and drag
Hold Ctrl (or the key you set in Filee) and drag the files. A donut of formats opens at the cursor. Prefer menus? Right-click and choose Convert with Filee.
- 3
Drop on CSV
Release the files over CSV. A progress ring counts up, and each CSV file is saved next to its original.
What Filee does for XLSX → CSV
CSV holds a single table, so Filee writes one CSV per sheet. Cells are exported as values, ready for databases, scripts and import forms.
- Built in: works right after installing Filee, with nothing else to download.
- No Microsoft Office or LibreOffice needed.
- Batch: one file or hundreds, converted in parallel; a failure never stops the rest.
- Private: files are converted on your PC and never uploaded, even without internet.
- Saved next to the original, or in a folder and with a file name pattern you choose.
XLSX can also become
- HWPX
- ODS
- HTML
About XLSX and CSV
CSV
Comma-separated values
CSV is plain text with one table row per line. Every spreadsheet, database and programming language reads it, but it has no formatting, formulas or multiple sheets.
Extensions: .csv
Convert XLSX to CSV for free
Filee is a free, open-source file converter for Windows 10 and 11. It works offline and converts 180+ formats with one drag and drop.
Download for Windows