Excel ↔ CSV Converter

Convert Excel files to CSV and CSV to Excel — instantly in your browser. Free, private, and fast. No upload.

Privacy: all processing is local in your browser.

Loading converter…

Why convert Excel to CSV and CSV to Excel?

CSV is a lightweight text format ideal for data import/export, APIs and analytics. Excel (.xlsx) is great for formulas and formatting. Our free online converter lets you switch between both formats instantly, without uploading files to a server.

Supported formats and delimiters

Excel: .xlsx, .xls, .xlsm (first-class support via SheetJS)
CSV variants: comma (,), semicolon (;), and tab (TSV)
Unicode: UTF‑8 recommended for special characters

Tips for clean conversions

Ensure consistent headers across sheets
Avoid stray commas inside unquoted cells
Prefer UTF‑8 to preserve accents and emojis

Excel ↔ CSV Converter — FAQ

Is this converter really free?

Yes — it’s 100% free and runs entirely in your browser.

Do you upload my files to a server?

No. All conversions are processed locally in your browser for maximum privacy.

Which Excel formats are supported?

.xlsx, .xls and .xlsm.

Can I convert only one sheet?

Yes, you can select the sheet and download its CSV.

How to handle semicolons or tabs?

Download as CSV then choose the delimiter in Excel or import settings of your tool.

Complete Converter Guide

When to Use Each Format

📊 Use Excel (.xlsx) When You Need:

Formulas and calculations
Formatting (colors, fonts, borders)
Multiple sheets in one file
Charts and pivot tables
Sharing with non-technical users

📋 Use CSV When You Need:

Lightweight, portable format
Importing to databases or APIs
Version control compatibility
Cross-platform compatibility
Minimal file size

Conversion Examples

Excel → CSV

Your Excel file:

Product | Price | Stock
------- | ----- | -----
Laptop  | $800  | 15
Mouse   | $25   | 150

Converts to a clean, portable CSV file ready for databases.

CSV → Excel

Your CSV data:

Name,Email,Phone
John,john@ex.com,555-1234
Mary,mary@ex.com,555-5678

Becomes a formatted Excel file you can edit with formulas and styling.

Common Issues & Solutions

❌ Issue: Excel Columns Look Wrong in CSV

Cause: CSV uses commas, semicolons, or tabs. Different applications default to different delimiters.

Fix: When opening CSV in Excel, use "Import" and select the correct delimiter (comma, semicolon, or tab).

❌ Issue: Accents Appear as Garbled Text

Cause: Encoding mismatch. CSV needs UTF-8, but Excel might be exporting in a different format.

Fix: In Excel, use File → Save As → Choose CSV format → Advanced → UTF-8 encoding.

❌ Issue: Formulas are Lost in CSV

Cause: CSV stores values only, not formulas. This is by design.

Fix: If you need formulas, keep the file as .xlsx. Convert to CSV only after final calculations.

❌ Issue: Decimal Numbers Display Incorrectly

Cause: Locale differences (comma vs. period for decimals).

Fix: When opening CSV, ensure your system locale matches your data (e.g., German uses commas, English uses periods).

Supported Excel Formats

Format	Extension	Description	Supported
Excel (Modern)	.xlsx	Latest format (2007 onwards)	✓ Yes
Excel (Legacy)	.xls	Older Excel format	✓ Yes
Excel Macro	.xlsm	With macros (data only)	✓ Yes
CSV Variants	.csv, .txt	Comma, semicolon, tab-separated	✓ Yes

CSV Viewer