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Convert XLSX to CSV

XLSX to CSV conversion runs in the TeraConvert desktop app, fully local on your Mac. Drop a file below to see what the free browser converter can do with it.

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How to Convert XLSX to CSV

  1. 1

    Get TeraConvert for Mac

    Free download for Apple Silicon; this format needs Pro.

  2. 2

    Drop your XLSX files

    One file or a whole batch at once.

  3. 3

    Pick CSV and convert

    Everything runs locally; nothing is uploaded.

Why Convert XLSX to CSV?

XLSX is a whole workbook: multiple sheets, formulas, formatting, the works. A lot of importers and data pipelines want none of that, just plain comma-separated rows they can parse without an Office library.

Flattening to CSV strips the workbook down to its data, evaluating formulas into their final values on the way out.

XLSX
CSV
Type
Office Open XML
Type
Plain-text table
Editable
Yes
Encoding
UTF-8 (typical)
Formulas
Full Excel formula support
Formulas
No (values only)
Charts
Embedded charts supported
Multi-sheet
No (one table)
Browser support
Via Excel Online / Sheets
Editor support
Universal
Typical use
Spreadsheets, finance
Typical use
Data interchange

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Frequently Asked Questions

Can I convert XLSX to CSV in the browser?
No. Reading the XLSX workbook format needs a real spreadsheet engine, so this pair runs in the desktop app through LibreOffice Calc, locally on your Mac. The browser tool handles CSV and TSV, just not XLSX input.
My workbook has several sheets. What happens?
CSV is a single-table format, so each sheet exports to its own CSV file. There is no way to pack multiple sheets into one CSV; that is a limit of the format, not the tool.
Do my formulas end up in the CSV?
No, and you would not want them to. Formulas are evaluated and only their computed values are written, so the CSV holds numbers and text, never =SUM(...).
Will formatting, colors, and merged cells survive?
No. CSV is plain text with zero styling, so colors, fonts, borders, and merged cells all fall away. If any of that matters, convert to PDF instead of CSV.
Is my file still private in the desktop app?
Yes. The desktop app converts with native engines on your Mac and works offline after a one-time activation check. Nothing is uploaded, in the browser or on desktop.

Flattening a folder of Excel workbooks?

Browsers handle CSV and TSV but not the XLSX workbook format, so this pair runs in the desktop app through LibreOffice Calc.

Get TeraConvert for MacFree to download. This format unlocks with Pro.