Convert XLSX to CSV Free Online — Extract Spreadsheet Data

Convert Excel XLSX spreadsheets to CSV format for data processing and analysis. Clean, comma-separated output ready for import. Free online.

Drop XLSX files here

or click anywhere in this box to choose files

Files deleted within 24 hours TLS-encrypted upload No sign-up required Batch convert supported

Max file size 50MB. Sign up for more.

Selected Files

File Name	Size	Convert To

Convert all to:

Conversion Complete

File Name	File Size	Download

Convert More Files Buy Me a Coffee Download All (ZIP)

XLSX vs CSV: Side-by-side

Technical comparison of the two formats — useful for deciding which to use, or for confirming what changes during conversion.

Property	XLSX	CSV
Full name	Microsoft Excel (Open XML)	Comma-Separated Values
Year introduced	2007	1972
Developer / standard body	Microsoft	IBM (informal)
MIME type	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet	text/csv
File extension	.xlsx	.csv
Compression	ZIP-compressed XML	None
Color / data depth	N/A	N/A
Max dimensions / size	1,048,576 rows × 16,384 columns	Unlimited
Transparency	No	No
Animation	No	No
Standard / specification	ECMA-376 / ISO/IEC 29500	IETF RFC 4180
Best for	Modern Excel spreadsheets, data analysis	Data interchange, database imports, ETL pipelines

About the XLSX Format

XLSX (Excel Open XML Spreadsheet) is the default file format for Microsoft Excel 2007 and later. Built on the Office Open XML standard (ECMA-376, ISO/IEC 29500), it uses ZIP-compressed XML files to store spreadsheet data, formulas, formatting, charts, and pivot tables. XLSX replaced the legacy XLS binary format with a more efficient, recoverable, and interoperable architecture.

XLSX supports over one million rows and 16,000 columns per worksheet, 500+ built-in functions, conditional formatting, data validation, and advanced chart types. The format is natively supported by Microsoft Excel, Google Sheets, Apple Numbers, LibreOffice Calc, and most modern spreadsheet applications. XLSX is the global standard for financial modeling, data analysis, reporting, and business intelligence workflows.

XLSX to CSV FAQ

Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert XLSX files to CSV.

How do I convert an Excel spreadsheet to CSV?

Upload your XLSX file and click Convert. iFormat extracts the data from the first sheet and saves it as a CSV file. Download your plain-text data file instantly.

Why convert XLSX to CSV?

CSV is universally compatible — it can be imported into any database, CRM, analytics tool, or programming language. Many systems can't read XLSX but can read CSV. Converting removes the dependency on Excel.

Will all sheets be converted?

The converter processes the first (active) sheet. For multi-sheet XLSX files, only the first sheet is exported to CSV. To convert other sheets, open the XLSX in Excel or Google Sheets, navigate to the desired sheet, and save it as CSV from there.

Will Excel formulas be preserved?

No. CSV is a plain-text format with no formulas, formatting, or macros. Formula results (calculated values) are included in the CSV output, but the formulas themselves are not.

Is XLSX to CSV conversion free?

Yes — free with no watermarks and no account required.