XLSX to CSV Converter with Private, Local Processing
Convert an Excel XLSX workbook to clean CSV in your browser. Choose the worksheet and delimiter, keep international text readable, and download without uploading your file.
Your workbook is read locally. It is never uploaded to this website.
No workbook selected
Choose a workbook to inspect its worksheet names before creating CSV output.
How to convert XLSX to CSV online
Open the workbook locally, choose the sheet and CSV settings, then download a plain-text data file.
Choose an XLSX workbook
Select a Microsoft Excel .xlsx file up to 25 MB. The workbook is read only inside your browser.
Select a sheet and delimiter
Choose the worksheet, then use a comma, semicolon, or tab delimiter. Keep UTF-8 BOM enabled for broad Excel compatibility.
Download the CSV
Convert and download the selected sheet as a .csv file containing its displayed cell values.
Choose XLSX to CSV output settings
CSV has no workbook tabs, so you select one worksheet for each downloaded file.
| Control | Setting | Effect |
|---|---|---|
| Worksheet | Any workbook sheet | Exports one selected worksheet because CSV has no tabs |
| Delimiter | Comma, semicolon, or tab | Matches the separator expected by your database, locale, or application |
| Text encoding | UTF-8 with optional BOM | Keeps accented and non-Latin text readable in current Excel versions |
| Processing | Local browser | The XLSX workbook is not uploaded to a conversion server |
XLSX vs CSV: what changes
XLSX stores a complete Excel workbook. CSV stores the displayed values from one sheet as delimited text.
| Characteristic | Source | Output |
|---|---|---|
| Structure | Workbook with multiple worksheets | One flat table per file |
| Cell values | Numbers, text, dates, and formula results | Displayed values written as text fields |
| Formatting | Fonts, colors, borders, and number formats | Not supported |
| Formulas | Stored and recalculated by spreadsheet software | Only the saved displayed result is exported |
| Charts and images | Supported | Not supported |
What this Excel to CSV converter preserves
The converter focuses on portable cell values rather than spreadsheet presentation or calculation features.
Private browser conversion
ExcelJS reads the workbook and creates CSV on this device. The source XLSX file is never sent to the server.
Correct CSV escaping
Fields containing quotes, line breaks, or the selected delimiter are quoted, and embedded quotes are doubled.
International text support
CSV output uses UTF-8. The optional BOM helps Microsoft Excel detect UTF-8 when opening the file directly.
One worksheet at a time
A CSV file cannot store multiple tabs. Select a worksheet and repeat the download for any additional sheets you need.
Related spreadsheet and conversion tools
Choose another workflow for extracting tables or converting source files.
XLSX to CSV converter FAQ
How do I convert XLSX to CSV?
Choose an XLSX file above, select the worksheet and delimiter, then select Convert to CSV. The downloaded file contains the displayed values from that sheet.
Is this XLSX to CSV converter free?
Yes. You can convert XLSX workbooks within the displayed 25 MB file limit without creating an account.
Is my Excel file uploaded?
No. Workbook parsing and CSV creation run locally in your browser, so the XLSX file does not leave your device.
Can CSV contain multiple Excel worksheets?
No. CSV is one flat table and has no worksheet tabs. Select one workbook sheet for each CSV file you want to download.
Are Excel formulas preserved in CSV?
No. CSV cannot store formulas. The converter exports the formula result saved in the XLSX workbook; it does not recalculate formulas.
Does CSV preserve Excel formatting?
No. Fonts, colors, borders, merged-cell layout, charts, images, filters, and column widths are not part of the CSV format.
Which delimiter should I choose?
Choose comma for standard CSV, semicolon when your locale uses commas as decimal separators, or tab for applications expecting tab-separated data.
What does UTF-8 BOM do?
The BOM is a short marker at the beginning of the file that helps Microsoft Excel recognize UTF-8 text, especially for accented and non-Latin characters.
Can I convert XLSX to CSV without Microsoft Excel?
Yes. The conversion runs in a modern web browser and does not require Excel, LibreOffice, or other desktop software.
Why are dates or large numbers different in CSV?
CSV stores displayed text without Excel cell types or formatting rules. When reopening CSV, spreadsheet software may automatically interpret dates, leading zeros, or long numbers.
Create a private CSV now
Choose an XLSX workbook, select the worksheet and delimiter, and download clean UTF-8 CSV data.
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