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FreeConvertter

XLSX to CSV Converter

Export every sheet of an Excel workbook as clean CSV that opens correctly everywhere.

XLSXto

or drag and drop them here · up to 50 MB per file

Your files are processed on this device and never uploaded.

Instant conversion

There is no upload or server queue, so conversion starts the moment you drop a file and finishes as fast as your device can process it.

Your files stay private

Files are processed entirely inside your browser. They are never sent to, stored on, or seen by any server.

Nothing to install

Works on Windows, macOS, Linux, Android and iOS in any modern browser. No software, no extensions, no account.

How to convert XLSX to CSV

  1. 1

    Click "Choose XLSX files" or drop your Excel workbooks onto the converter.

  2. 2

    Optionally open "Options" to pick the sheets, the delimiter, the encoding and line endings.

  3. 3

    Click "Convert". Each sheet is exported on your device.

  4. 4

    Click "Download". Several sheets are bundled into one ZIP file.

Why convert XLSX to CSV?

  • Import anywhere — databases, CRMs, accounting software and analytics tools all accept CSV.
  • Version control and scripts — CSV is plain text that works with Git, Python, R and command-line tools.
  • Smaller files — no styles or metadata, just the data.

How the conversion works

The workbook is read with SheetJS. Each selected sheet is written row by row using the values shown in Excel, with dates rewritten as ISO dates. Cells containing the delimiter, quotes or line breaks are quoted automatically.

What is an XLSX file?

XLSX is Microsoft Excel’s default workbook format since 2007, based on the Office Open XML standard. A workbook can contain several sheets, each a grid of cells holding text, numbers, dates or formulas, together with formatting, charts and comments. Inside, it is a ZIP archive of XML files.

XLSX opens in Excel, Google Sheets, LibreOffice Calc, Apple Numbers and Hancom Cell. Files ending in .xlsm are the same format with macros enabled.

What is a CSV file?

CSV (comma-separated values) stores a single table as plain text: one row per line, with cells separated by commas (or semicolons or tabs in some regions). Cells that contain commas, quotes or line breaks are wrapped in double quotes.

CSV is the universal exchange format for data — almost every database, spreadsheet, CRM, bank and analytics tool can import and export it. It has no formatting, formulas or multiple sheets, and it does not record its own text encoding, which is why non-English CSV files sometimes open with garbled characters.

Frequently asked questions

My workbook has several sheets. What happens?

Each sheet becomes its own CSV file named after the sheet, for example report-Sales.csv. Choose "First sheet only" if you need just one file.

Will Korean, Japanese or accented text display correctly in Excel?

Yes. Files are saved as UTF-8 with a byte-order mark (BOM) by default, which is what Excel needs to recognise UTF-8 text. Choose plain UTF-8 for tools that dislike the BOM.

How are dates written?

As ISO dates such as 2026-01-15 (with the time if there is one). Unlike formats such as 1/15/26, ISO dates are read the same way in every country and program.

Are formulas kept?

CSV can only store values, so each formula is replaced by its last calculated result.

Is my workbook uploaded?

No. The conversion runs entirely in your browser.

Related guides

Why your CSV shows garbled characters in Excel (and how to fix it)When non-English text in a CSV turns into symbols like "é" in Excel, the file isn't broken — Excel guessed the wrong encoding. Here are three reliable fixes.Read guide →CSV vs XLSX — when to use whichBoth hold tables, but CSV is plain data while XLSX is an Excel workbook. The differences, when to choose each, and how to convert without damaging your data.Read guide →Excel removes leading zeros from your CSV — how to keep themZIP codes, phone numbers and IDs lose their leading zeros, and long numbers turn into 1.23E+19. Here's why Excel does it and how to keep your data intact.Read guide →

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