Convert Excel to CSV instantly

Convert Excel XLSX files to CSV in your browser. No upload, no server. Your spreadsheets stay on your device.

Drop your XLSX file here

or click to browse

Your files stay private
No server upload
Instant conversion

Example

Input (XLSX)

[sales_report.xlsx]
Excel spreadsheet with 3 sheets
File size: 45 KB

Output (CSV)

name,revenue,quarter
Widget A,12500,Q1
Widget B,8900,Q2
Widget C,15300,Q3

About this converter

Excel files are great for analysis but terrible for interoperability. When you need to import data into a database, feed it to a Python script, or load it into another tool, CSV is what you want. This converter uses the SheetJS library to parse your XLSX file entirely in the browser and exports the first sheet as CSV. No data is uploaded. Your spreadsheet never leaves your device. The output is standard comma-delimited CSV with proper quoting for fields that contain commas or newlines.

XLSX vs CSV

Microsoft Excel Spreadsheet (XLSX)

XLSX is the default spreadsheet format for Microsoft Excel (2007 and later). It stores data, formulas, charts, and formatting in a compressed XML-based container.

Common uses: spreadsheets, financial reports, data analysis, and business reporting

Comma-Separated Values (CSV)

CSV (Comma-Separated Values) is a plain-text format for storing tabular data where each line represents a row and values are separated by commas.

Common uses: spreadsheets, databases, and tabular data

RFC 4180 (CSV specification)

How to convert XLSX to CSV

  1. 1

    Upload

    Upload your XLSX file using the drop zone above, or click to browse your device.

  2. 2

    Convert

    Click the "Convert to CSV" button. The conversion runs instantly in your browser.

  3. 3

    Download

    Download your converted CSV file. No data was sent to any server.

Frequently Asked Questions

Last updated: 2026-03-23