100% Free, Private & Browser-Based Excel to CSV Converter — Convert XLSX & XLS Instantly.
Drop your Excel file here or browse
Supports .xlsx, .xls, .xlsm, .ods & .csv · Processed locally — never uploaded
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ExcelToCSV is a free online Excel to CSV converter that runs entirely in your web browser. It turns XLSX, XLS, XLSM and ODS spreadsheets into clean CSV files without uploading anything to a server.
When a workbook has more than one worksheet, ExcelToCSV shows every sheet as a tab above the settings (a dropdown on phones). Click a tab to switch: the preview, row/column stats and CSV output update right away. The active sheet is the one that gets copied or downloaded, and Download All Sheets as ZIP exports every tab at once.
The preview shows the converted rows and columns exactly as they will appear in the CSV, with spreadsheet-style column letters and row numbers. Switch to Raw CSV to see the text output with your delimiter and quoting applied. Large sheets show the first rows for speed, but copy and download always include every row.
Drag and drop an .xlsx, .xls, .xlsm, .ods or .csv file into the dropzone, or click to browse. SheetJS parses it in memory in a fraction of a second.
Every sheet in the workbook appears as a tab (or in a dropdown on mobile). Switch between them to preview each one.
Choose a comma, semicolon, tab or pipe delimiter, UTF-8 / UTF-8 BOM / ASCII encoding, and how fields should be quoted. The preview updates live.
Copy the CSV to your clipboard, download the current sheet as a .csv file, or export every worksheet at once as a ZIP.
Files are never uploaded. Parsing and conversion happen locally in your browser, so confidential spreadsheets stay on your device.
Convert one worksheet or all of them. The ZIP export creates a separate, correctly named CSV for every sheet in the workbook.
UTF-8 with BOM keeps accents and non-Latin text intact when you re-open the CSV in Microsoft Excel. Semicolon output suits European locales.
An XLSX file is a zipped Office Open XML workbook that can hold multiple worksheets, formulas, styles, charts and images. A CSV (comma-separated values) file is plain text: one line per row, with values separated by a delimiter. CSV is the universal import format for databases, CRMs, analytics tools, Python/pandas, R and Google Sheets — which is why converting XLSX to CSV is one of the most common data-prep steps. Because CSV holds one table of values, each worksheet becomes its own CSV file, and formulas are exported as their calculated results.
Drag and drop your .xlsx, .xls, .xlsm or .ods file onto ExcelToCSV (or click to browse). Pick the worksheet, choose a delimiter, encoding and quote style, check the live preview, then click Download CSV File or Copy CSV to Clipboard. Everything runs instantly in your browser.
Yes. ExcelToCSV reads every worksheet in the workbook and shows them as tabs. You can preview and download any single sheet as CSV, or use Download All Sheets as ZIP to get one CSV file per worksheet in a single ZIP archive.
Load your workbook, set the delimiter, encoding and quote style, then click Download All Sheets as ZIP. ExcelToCSV converts every worksheet with the same settings and packs one CSV per sheet, each named after its sheet, into a single ZIP file.
Yes. Your spreadsheet is parsed entirely in your browser's memory using JavaScript. The file is never uploaded to any server, so your data stays on your device. You can even disconnect from the internet after the page loads and it will still work.
Microsoft Excel sometimes assumes a legacy encoding when opening CSV files. Choose the UTF-8 with BOM encoding option before downloading — the byte order mark tells Excel the file is UTF-8 so characters like é, ü, ñ and emoji display correctly.
Use a comma for most tools and English-locale software. Use a semicolon if you open CSV files in Excel in regions that use a comma as the decimal separator (much of Europe). Tab produces TSV-style output and pipe is useful for data that contains many commas.
ExcelToCSV is 100% free with no sign-up and no watermarks. There is no fixed file size limit — the practical limit depends on your device's memory. Workbooks with hundreds of thousands of rows convert fine on most modern computers.
CSV is a plain-text format, so it stores values only. ExcelToCSV exports the calculated value of each formula, as displayed in Excel (including number and date formatting). Colors, fonts, merged cells, charts and images are not part of CSV.