XLSX to CSV Converter
Export Excel (.xlsx) files to CSV online — free, no signup, browser-based whenever possible. Drop your XLSX and download a plain CSV instantly.
Drop files here, browse
Drop your XLSX or XLS file here
Max file size: 100 MB
Auto-detect Format
Drop a CSV and it converts to XLSX. Drop an XLSX and it converts to CSV. The mode is set automatically.
Private by Design
SheetJS runs in your browser. Your spreadsheet data is processed locally whenever possible and is not sent to any server.
Preserves Structure
Column headers and data are preserved as faithfully as possible in the output format.
How to convert XLSX to CSV online
- Drop your Excel (.xlsx or .xls) file onto the drop zone above, or click to browse.
- The tool auto-detects the XLSX format and sets the mode to XLSX → CSV automatically.
- Click Convert to CSV to process your file.
- Preview the first rows to verify the data looks right, then click the download button.
Why convert XLSX to CSV?
CSV is the most portable data format — it works with every database, CRM, analytics tool, and spreadsheet app. If you need to move data out of Excel into another system, a free XLSX to CSV converter like this one is the fastest way to get a clean, universally-readable file. No software to install — just open the page, drop your Excel spreadsheet, and download the CSV.
Privacy — your spreadsheet data stays local
This tool uses SheetJS (xlsx) — an open-source JavaScript library that runs directly in your browser. Your spreadsheet file is processed locally on your device whenever possible and is not sent to any server. This makes it suitable for business data, financial exports, and contact lists. That said, always follow your organisation's data policies before using any online tool with confidential or regulated data.
Frequently Asked Questions
Is this XLSX to CSV converter free?
Yes — completely free. No account, no signup, and no limits on the number of conversions. This is a free XLSX to CSV converter with no hidden costs.
Is my Excel file uploaded to a server?
No. The conversion runs in your browser using SheetJS. Your file data is processed locally whenever possible and is not transmitted to any server.
What happens to formulas when converting XLSX to CSV?
Formulas are converted to their computed values. CSV is a plain-text format and does not support formulas, formatting, or multiple sheets — only the first worksheet is exported.
Does it support .xls files as well?
Yes — both .xlsx and the older .xls format are supported. Drop either and the tool will export the first sheet as a CSV file.