How to Convert Excel to CSV (and CSV to Excel) — Free Guide

Excel and CSV are the two most common formats for working with tabular data. Knowing when to use each, and how to convert between them, is an everyday task for analysts, developers, and business users.

Excel (.xlsx) vs CSV — Key Differences

Feature          Excel (.xlsx)      CSV
Format:          Binary             Plain text
Multiple sheets: Yes                No (one sheet)
Formatting:      Full (fonts, etc)  None
Formulas:        Yes                No
File size:       Larger             Smaller
Compatibility:   Requires Excel     Universal

When to Use CSV

• Importing data into databases (MySQL, PostgreSQL)
• Loading data in Python (pandas), R, or data pipelines
• Sharing data with systems that don't have Excel
• Version control — CSV diffs are readable in git

When to Use Excel

• When you need multiple sheets
• When you need formulas, charts, or pivot tables
• Sharing with non-technical stakeholders
• Financial models and reports

Common CSV Problems and Fixes

Delimiter confusion

CSV files can use comma, semicolon, or tab as the delimiter. European systems often default to semicolons because commas are used as decimal separators. If your CSV looks wrong in Excel, check the delimiter setting.

Encoding issues

Always use UTF-8 encoding for CSV files to handle international characters (Hindi, Swedish, Chinese, etc.) correctly. The EazyTools converter uses UTF-8 by default.