BULK66 Your files stay yoursSMALL TOOL. SIMPLE CONVERSIONS.
XLSX to CSV Converter
Convert XLSX files to CSV with browser-based processing and downloadable results. Your files are not uploaded to a server.
Drop your files here
or choose a few from your device
Format support & limits
Offline libraries are bundled locally. Full support guide
Your files
Private by design
No uploads. Your files stay on your device.
Light on everything
No installs, accounts, or extra software.
A few files? One click.
Convert a whole queue, then download.
How to use XLSX to CSV Converter
- Add one or more supported files using Choose files or drag and drop.
- Confirm the output format and add only the adjustments you need. Output choices reflect browser support and the files in your batch.
- Convert the files, review any reported errors and download or share each generated result.
What to know before you start
CSV exports one sheet as plain tabular data. Select the required sheet or cell range first. Charts, styling and workbook features are not retained.
Frequently asked questions
Does conversion preserve the original file exactly?
The original file on your device is unchanged. The new format may use different compression or omit features. Read the conversion notes above and the format-specific notice in the workspace.
Are my files uploaded to BULK66?
No. The tool processes files and generates downloads in your browser. Generated files can be downloaded to your device. Save your output before closing the page.