Excel to CSV Converter Online (Free) - XLSX to CSV

CSV is the universal exchange format - lightweight, text-based, and accepted by almost every tool, database and script. Converting an Excel workbook to CSV is therefore a frequent step in any data pipeline. This guide explains the conversion and shows how to do it with the free Excel to CSV Converter. It handles every sheet, escapes fields properly, lets you download one or all sheets, and runs entirely in your browser so nothing is uploaded.

What converting Excel to CSV means

An Excel workbook can hold many sheets, rich formatting, formulas and multiple data types. CSV is far simpler: plain text, one grid, values separated by commas, rows separated by line breaks. Converting flattens a sheet into that simple grid.

The converter reads each sheet from the workbook and writes out its cells as CSV. Formula cells are exported as their calculated values, since CSV cannot store formulas. Any value containing a comma, a double quote or a line break is wrapped in double quotes, and internal quotes are doubled, following the CSV standard so the file parses correctly everywhere.

Because CSV represents only one grid, a multi-sheet workbook becomes multiple CSV files - one per sheet - which the tool lets you download individually or together.

How to use the Excel to CSV Converter

It is a quick process:

1. Open the Excel to CSV Converter.
2. Drop in or select your .xlsx, .xls or .ods file.
3. The tool reads the workbook and lists its sheets.
4. Preview a sheet to confirm the data looks right.
5. Download a single sheet as CSV, or download all sheets at once.

No sign-up and no install. The conversion runs locally so it is instant and your file never leaves your device.

Example: a sheet to CSV

A sheet that looks like this in Excel:

becomes CSV text with a header line name,total,note followed by one line per row. Because the first note contains a comma, that cell is wrapped in double quotes so the comma is not mistaken for a separator. The numbers are written as plain values, and any formula that produced them is replaced by the result.

Use cases

Excel to CSV conversion appears throughout data work:

• Database import: load spreadsheet data into a database that expects CSV.
• Scripting: feed data to a Python, R or shell script that reads CSV.
• System migration: move data between apps that share CSV but not .xlsx.
• Version control: store a text CSV in Git instead of a binary workbook.
• Lightweight sharing: send a small, universally readable file.

If you would rather produce structured data, the Excel to JSON converter outputs objects, and to view a workbook first the Excel Viewer opens it in the browser.

Tips and common mistakes

Watch for these:

• One CSV per sheet. Remember CSV holds a single grid, so export each sheet you need separately.
• Formulas become values. This is usually desired, but if you needed the formula itself, CSV cannot keep it.
• Leading zeros and long numbers: CSV stores them as text, but a program that re-opens the CSV may reformat them. Check IDs and phone numbers.
• Dates: how a date appears depends on the cell formatting in the workbook. Confirm the exported format matches what you expect.
• Encoding: the output is UTF-8, so open it as UTF-8 to keep accented characters correct.

Privacy: converted in your browser

Workbooks often contain confidential financials, customer data or internal reports. The Excel to CSV Converter reads and converts the file entirely in your browser with JavaScript, so it is never uploaded, logged or stored on a server. The data stays on your device the whole time.

That makes it safe for sensitive spreadsheets. Find more private data utilities in the dev tools category or see all tools.