Convert XLSX to CSV Online

Turn an Excel workbook into a universal CSV file. The conversion runs locally in your browser, so your XLSX never leaves your device.

Your file never leaves your device.

How to convert XLSX to CSV

The converter reads the first worksheet of your workbook and writes each row as a CSV line, keeping the cell values as text. CSV opens in every spreadsheet, database and analytics tool, so your data stays portable.

Step 1: Add your XLSX
Drop the .xlsx file onto the converter or click to browse.
Step 2: Convert locally
Azpy's engine reads the first worksheet right in your browser. Nothing is uploaded.
Step 3: Download the CSV
Download the .csv file and open it in Excel, Google Sheets or any other tool.

Good to know

Cell values are exported as displayed; formulas are replaced by their calculated results.
CSV holds one table, so the first sheet is exported. Move the sheet you need to the first position if the workbook has several.

Why use this XLSX to CSV converter?

CSV is the universal format for data interchange, every spreadsheet, database and import/export flow reads it.
100% private, the conversion happens in your browser, no upload, no servers.
Works offline: once the page is loaded, the converter runs without any internet connection.
Free forever with no watermarks, plus batch conversion on Pro.

Is it free?

Yes. XLSX to CSV conversion is completely free, with no watermarks and no limits on normal use.

Is my file uploaded?

XLSX to CSV runs entirely in your browser. Your file is never uploaded and never leaves your device.

About the formats

What is XLSX?

XLSX (Excel Open XML) is the standard spreadsheet format from Microsoft Excel, also supported by Google Sheets and LibreOffice Calc. Data is organised into cells and sheets, with support for formulas, functions, charts and formatting. Because the file is a ZIP container of XML, its content stays readable and easy to process.

Use XLSX for tabular data that needs structure and calculation, budgets, inventories, lists and anything with formulas or multiple sheets. When you only need the raw data, you can export a single sheet to CSV or JSON here.

Excel Spreadsheet (XLSX)

What is CSV?

CSV (comma-separated values) is a plain-text format that stores tabular data, one row per line and fields separated by commas. It needs no special software: any text editor, spreadsheet application or database can read it. Because of its simplicity, CSV is the universal interchange format between databases, spreadsheets and other programs.

Use CSV whenever you need to move tabular data between systems, exporting a database, importing contacts or sharing a table with someone who uses different software. Choose CSV when plain, predictable data matters more than formatting.

CSV (Comma-Separated Values)