Excel ↔ CSV Converter
Convert CSV to a real Excel file, or Excel back to CSV, with multi-sheet support and a live preview, entirely in your browser.
Excel to CSV Converter turns CSV data into a real downloadable .xlsx file, and Excel workbooks (.xlsx or .xls) back into CSV, entirely in your browser. Supports multiple sheets, custom delimiters, and a live table preview before export. No upload, no account. Made by FreeToolHub.
Convert CSV to Excel
Paste CSV data or upload a .csv file, preview it as a table, then download a real .xlsx workbook.
Convert Excel to CSV
Upload an Excel workbook, pick a sheet if it has more than one, then copy or download the result as CSV.
Drop an Excel file here or click to browse
.xlsx or .xls · Your file never leaves your browser
Powered by the open-source SheetJS library, running entirely on your device — no file ever leaves your browser.
Frequently Asked Questions
How do I convert a CSV file to Excel?
Paste your CSV data or upload a .csv file, choose the delimiter that matches your data, then click Preview to check the table before downloading a real .xlsx file that opens directly in Excel, Google Sheets, or Numbers.
How do I convert an Excel file to CSV?
Upload your .xlsx or .xls file by dragging it in or browsing, pick the sheet if the workbook has more than one, then copy the result or download it as a .csv file.
Does this tool support multiple sheets?
Yes. When an uploaded workbook contains more than one sheet, a sheet selector appears so you can preview and export any sheet individually.
What Excel file formats are supported?
Both the modern .xlsx format and the legacy .xls format can be uploaded and read. Generated Excel files are always saved as .xlsx.
Is my file uploaded to a server?
No. Everything runs locally in your browser using the open-source SheetJS library. Your spreadsheet data is never uploaded, transmitted, or stored anywhere.
Is this converter free to use?
Yes, this Excel to CSV and CSV to Excel converter is 100% free with no limits, no sign-up, and no ads.