Securely Convert Excel, CSV & All Spreadsheet Formats
Convert spreadsheet files between any format instantly with our free online converter. Transform Excel XLSX to CSV, XLS to XLSX, ODS to Excel, and support for 12+ spreadsheet formats - all with live preview and no file upload required.
Drag or drop your spreadsheet
Or paste file (Ctrl+V)
Supports XLSX, CSV, ODS, XLS & more
How to convert a spreadsheet
Follow these three simple steps to convert your spreadsheet in seconds.
1. Upload Spreadsheet
Click the upload button or drag and drop your Spreadsheet directly into the drop zone to get started.
2. Convert Spreadsheet
Select your desired output format, and click 'Convert Spreadsheet' button.
3. Download
The conversion happens instantly in your browser. Once complete, download your converted Spreadsheet.
Spreadsheet Conversion Features
12+ Format Support: XLSX, XLS, CSV, ODS, XLSM, XLSB, FODS, XML, and template formats
Live Data Preview: See your spreadsheet data before converting with scrollable table view
Multi-Sheet Support: Preview and convert workbooks with multiple sheets
Browser-Based Processing: All conversion happens locally using WebAssembly, no upload required
100% Private & Secure: Your spreadsheet files never leave your device, complete confidentiality
Sheet Selector: Choose specific sheets to preview from multi-tab spreadsheets
No File Size Limits: Convert large spreadsheet files without restrictions
Instant Conversion: Convert large spreadsheets in seconds with browser processing
Perfect for data migration, format compatibility, Excel to Google Sheets preparation, legacy file conversion, cross-platform collaboration, database imports, and automated reporting. Essential for data analysts, business professionals, accountants, and anyone working with spreadsheet files
Frequently Asked Questions
Upload your XLSX file, select 'CSV' as the output format, and click 'Convert Spreadsheet'. The converter extracts data from your selected sheet and creates a clean CSV file ready for download. Perfect for database imports, data analysis tools, or opening in plain text editors.
Yes! Upload your legacy XLS (Excel 97-2003) file and select XLSX as the output format. This converts old Excel files to the modern Office 2007+ format, enabling compatibility with newer Excel versions, better compression, and advanced features while preserving all your data.
Absolutely! Convert ODS (OpenDocument Spreadsheet) files to Excel formats (XLSX, XLS) or CSV. Also convert Excel files to ODS for LibreOffice/OpenOffice compatibility. Perfect for cross-platform teams using different office suites while maintaining data compatibility.
Yes! After uploading, you'll see a live preview of your spreadsheet with up to 500 rows displayed in a scrollable table. For workbooks with multiple sheets, use the sheet selector dropdown to preview different tabs before conversion. This ensures you're converting the right data.
Completely safe! All spreadsheet conversion happens entirely in your web browser using JavaScript - your files are never uploaded to any server. This ensures complete privacy for sensitive data like financial records, client lists, business reports, or personal information. Your data stays 100% on your device.