xlsxFree browser-based CSV converter
Convert XLSX to CSV Online
Convert Excel spreadsheets (.xlsx and .xls) to CSV files quickly and securely. No installation required.
Convert your workbook
This setting applies to every visible worksheet.
How to Convert XLSX to CSV
Upload your XLSX file
Click or drop a .xlsx or .xls workbook. It is checked and read locally — never uploaded.
Convert Excel data to CSV
Switch between worksheets to preview the first rows. Pick a delimiter, encoding, and whether to keep the header row.
Download your CSV file
Convert, then download each visible worksheet as a CSV — or a single ZIP containing all of them. Hidden sheets are not exported.
XLSX and CSV Explained
What is XLSX?
XLSX is the default spreadsheet format used by Microsoft Excel. It stores worksheets, formulas, formatting, and structured spreadsheet data.
What is CSV?
CSV, or Comma-Separated Values, is a simple text format used to exchange data between applications, databases, analytics tools, and AI workflows.
Your workbook never leaves this tab
There is no upload step and no server-side conversion.
Processed locally
Your workbook is read and converted right here in this browser tab.
No account required
No sign-up, email, payment details or tracking pixels are needed.
Visible sheets stay separate
Each visible worksheet becomes its own CSV. Hidden sheets are skipped.
Control the details that matter
Every visible worksheet exported
Each sheet stays separate. Multiple CSV files are bundled into one ZIP download.
XLS & XLSX
Works with modern Excel workbooks and legacy .xls files from Excel 97-2003.
Delimiter & encoding control
Choose comma, semicolon, tab or pipe, and add a UTF-8 BOM so Excel displays your data correctly. Read the CSV encoding guide if the output opens with garbled characters.
Clear 10 MB limit
Files up to 10 MB are supported. Larger files are not accepted so your browser stays responsive.
What CSV keeps—and leaves behind
Kept in the CSV
- Displayed cell values, including formatted dates and percentages
- Last-saved results of formulas
- Column positions and empty cells
Not preserved
- Colors, fonts, merged cells, charts, images and comments
- Formulas, macros and data validation
- Workbook-only formatting and behavior
Make the right CSV for the next step
Two short reads to avoid the most common CSV pitfalls — garbled characters, and picking the right format before you upload it to an AI tool.
Frequently Asked Questions
Can I convert XLSX to CSV for free?
Yes. This XLSX to CSV converter is free to use, requires no account, and runs directly in your browser.
How do I convert an Excel file to CSV?
Upload an XLSX or XLS file, review the visible worksheets, choose CSV options such as delimiter and encoding, then download the converted CSV file or ZIP archive.
Does this converter support large XLSX files?
Files up to 10 MB are supported. The limit keeps browser-based conversion responsive on phones and low-end computers, and helps protect your tab from oversized or unsafe files.
Is my uploaded Excel file secure?
Yes. The conversion runs locally with JavaScript in your browser. Your Excel file bytes, worksheet names, and cell contents are not uploaded to a server.
Can I convert XLS files?
Yes, the converter accepts both modern .xlsx and legacy .xls (Excel 97-2003) files.
Can I convert a workbook with multiple worksheets?
Yes. Every visible worksheet is converted and, when there is more than one, the CSV files are packed into a single ZIP archive. Hidden worksheets are skipped for privacy.
Why does Excel show garbled characters in my CSV?
Excel on Windows may guess the wrong encoding unless the CSV starts with a BOM. Choose "UTF-8 with BOM" so Excel displays accents and non-Latin characters correctly.
Ready to convert your workbook?
Choose an Excel file and create your CSV without uploading anything.