UlvixorExcel to CSV Converter
Upload an Excel file (.xlsx or .xls) and get its content converted to CSV instantly, choosing which sheet to convert if the file has more than one. Everything runs in your browser, with no file ever uploaded to a server.
How it works
- Select an Excel file (.xlsx or .xls) from your device.
- The tool reads the workbook and automatically detects all of its sheets.
- If the file has more than one sheet, pick the one you want to convert from the dropdown menu.
- The content of the selected sheet appears as CSV in the result panel.
- Copy the resulting CSV or download it as a .csv file.
Use cases
- Convert an Excel report to CSV to import into a database or script.
- Extract one specific sheet from a multi-tab Excel workbook as a standalone CSV.
- Prepare Excel data for uploading to a tool that only accepts CSV.
- Share the content of a spreadsheet in a universal, plain-text format.
Use cases
- Convert an Excel report to CSV to import into a database or script.
- Extract one specific sheet from a multi-tab Excel workbook as a standalone CSV.
- Prepare Excel data for uploading to a tool that only accepts CSV.
- Share the content of a spreadsheet in a universal, plain-text format.
Common mistakes
- Expecting Excel formulas to be preserved in the resulting CSV.The CSV only contains each cell's already-calculated values, not the original formulas, because CSV is a plain-text format with no support for formulas.
- Uploading a file protected with an opening password and expecting it to process the same way.The tool doesn't prompt for passwords, so a file that requires one to open can't be read. Remove that protection in Excel before uploading it.
- Not realizing only one sheet at a time is converted in workbooks with multiple tabs.Pick the relevant sheet from the dropdown before copying or downloading; if you need several sheets, repeat the process for each one.
Frequently asked questions
No. Reading the Excel file and converting it to CSV happens entirely in your browser using the xlsx (SheetJS) library. Your file never leaves your device.
The tool supports .xlsx (modern Excel) and .xls (legacy format) files, plus other spreadsheet formats compatible with the xlsx library.
All sheets in the workbook are automatically detected, and you can choose which one to convert from a dropdown menu. Only one sheet is converted at a time.
No. The CSV only contains each cell's calculated value, not the original formulas, since CSV is a plain-text format with no support for formulas.
CSV is a plain-text format with no styling, so Excel's visual formatting, colors, and merged cells aren't preserved — only each cell's text or number value is exported.
Alternatives
In Excel you can directly use 'Save As' and choose CSV, and in Python pandas.read_excel(...).to_csv(...) does the same via script. This tool is handy when you only have browser access or want to extract a single sheet without opening Excel.