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Excel to CSV Converter

Data & Digital

Convert an Excel .xlsx or .xls file to CSV free online. Upload your spreadsheet, pick a sheet, and download or copy the CSV instantly in your browser.

Reviewed by the thecalcu.com team · Last updated July 19, 2026

Drag & drop an .xlsx or .xls file here

or click to browse — max 10.00 MB, stays on your device

What is a Excel to CSV?

An Excel to CSV Converter reads a binary .xlsx or .xls workbook, Excel's native, richly structured spreadsheet format, and extracts a chosen sheet's cell values into plain comma-separated values text. CSV strips away everything Excel format adds beyond raw data: formulas become their calculated values, and all formatting, colors, and cell styling are discarded, leaving just the underlying content in the simplest, most universally compatible spreadsheet export format.

This tool performs the conversion entirely in your browser using a JavaScript spreadsheet library: it parses the workbook and serializes the selected sheet as CSV, no upload, no server round-trip. It pairs naturally with the CSV to Excel Converter for the reverse direction, and with the vCard to CSV Converter if you're consolidating multiple data sources into CSV.

Why Use an Excel to CSV Converter?

Databases, import scripts, and countless data pipelines accept CSV far more readily than binary .xlsx files, since CSV requires no special library to parse and works identically across every operating system and programming language. Converting an Excel export to CSV removes a common integration barrier without needing Excel itself installed.

A concrete situation this solves: taking a report exported as .xlsx and converting it to CSV so it can be imported into a database, script, or third-party tool that only accepts plain-text CSV.

Who Should Use This Converter?

  • Developers and data engineers converting Excel exports into CSV for import scripts, databases, or ETL pipelines.
  • Analysts stripping Excel formatting and formulas down to raw values for use in other tools.
  • Anyone submitting data to a system that requires CSV specifically, rather than accepting .xlsx uploads.
  • Users working with multi-sheet workbooks who need to extract one specific sheet's data as a standalone CSV file.
  • Users going the other direction should see the CSV to Excel Converter for producing a genuine .xlsx workbook from CSV text.

What Insights Does the Excel to CSV Converter Give You?

Once uploaded, the tool shows how many sheets the workbook contains, if there's more than one, the Sheet dropdown lets you pick exactly which one to convert, since a single CSV file can only represent one sheet's data at a time.

The converted CSV Output panel shows the exact text that will be downloaded or copied, letting you confirm the data extracted correctly, particularly useful for checking that formula results and multi-line cell values came through as expected.

How to use this Excel to CSV calculator

  1. Drag and drop an .xlsx or .xls file onto the upload area, or click it to browse your device.
  2. If the workbook has multiple sheets, choose the one you want from the Sheet dropdown.
  3. Review the CSV Output panel showing the converted data.
  4. Click Download .csv to save the file, or use the copy icon to copy the CSV text directly to your clipboard.
  5. Click Change to start over with a different workbook.

Formula & Methodology

The browser reads the uploaded file's binary structure, for .xlsx, unzipping the Office Open XML archive and parsing its worksheet XML; for .xls, parsing the older binary format directly, then walks the selected sheet's cell grid, converting each row into comma-separated values with standard CSV quoting applied to any field containing a comma, quote, or line break.

For example, a workbook with a sheet containing a formula cell showing =A1+A2 (evaluating to 15) exports that cell as the plain value 15 in the CSV, the formula itself doesn't survive the conversion, only its last-calculated result.

Frequently Asked Questions

It reads a binary .xlsx or .xls workbook, extracts the cell data from a chosen sheet, and outputs it as plain comma-separated values text, the simplest, most universally readable spreadsheet export format.
The entire conversion runs in your browser using a JavaScript spreadsheet library, and your file never leaves your device. This makes the tool safe for financial data, contact lists, or any workbook you'd rather not send to a third-party server.
CSV is the most universally accepted format for importing data into databases, scripts, and other software, many tools that reject .xlsx files directly will happily accept CSV. Converting is also useful for stripping away formatting and formulas to get at just the underlying values.
Formulas are converted to their currently calculated values, not their formula text, CSV has no concept of a formula, so a cell showing =SUM(A1:A10) becomes just the resulting number in the CSV output. This matches how Excel itself exports to CSV.
All formatting is discarded, CSV is plain text with no concept of fonts, colors, borders, or number formatting. Only the underlying cell values carry over to the converted file.
Drag and drop your .xlsx or .xls file onto the upload area, or click it to browse your device. The CSV output for the first sheet appears automatically, ready to copy or download.
A Sheet dropdown appears listing every sheet in the workbook, select any sheet to see its data converted to CSV. Only one sheet converts at a time, since CSV has no way to represent multiple sheets in a single file.
You can upload a workbook up to 10MB, which comfortably covers spreadsheets with tens of thousands of rows. Very large or complex workbooks may take a moment longer to parse.
Yes, the copy icon on the CSV output panel copies the text directly to your clipboard, ready to paste into another application, script, or text editor without saving a file first.
Use the [CSV to Excel Converter](/csv-to-excel-converter/) to go the other direction, paste or upload CSV text and download a genuine .xlsx workbook.
Yes, the underlying spreadsheet library reads both the modern Office Open XML .xlsx format and the older binary .xls format used by pre-2007 versions of Excel.
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