XLSX to CSVConverter Online
Convert Excel spreadsheets to CSV format instantly. Process locally in your browser with full privacy. Handle multiple sheets, customize delimiters, and preview before download.
Excel to CSV Converter
Transform spreadsheets to universal CSV format
Upload Excel File
Drag and drop or click to browse
How It Works
Upload
Select your Excel file (.xlsx or .xls)
Choose Sheet
Pick which sheet to convert if multiple exist
Configure
Set delimiter, encoding & other options
Download
Get your CSV file instantly
Complete Privacy
Files processed locally in your browser. Nothing uploaded to servers.
Lightning Fast
Instant conversion with no waiting or queues.
Multi-Sheet Support
Handle workbooks with multiple sheets easily.
Custom Options
Configure delimiters, encoding, and more.
Preview Data
View your data before downloading.
Works Offline
No internet required after page loads.
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Tool Stats
Related Tools
Pro Tips
- Use UTF-8 BOM for Excel compatibility with special characters
- Semicolon delimiter works better for European locale Excel
- Preview data before download to verify correct sheet
Complete Guide to Converting Excel (XLSX) to CSV
Converting Microsoft Excel spreadsheets to CSV (Comma-Separated Values) format is one of the most common data transformation tasks in today's digital workflow. Whether you're a data analyst, business professional, developer, or student, understanding how to efficiently convert XLSX to CSV is essential for data portability and system compatibility.
What is XLSX Format?
XLSX is Microsoft Excel's default file format since Office 2007. It's based on the Office Open XML (OOXML) standard and uses ZIP compression to store spreadsheet data, including cell values, formulas, formatting, charts, and other Excel features. While XLSX files are powerful and feature-rich, they're not universally compatible with all systems and applications.
What is CSV Format?
CSV (Comma-Separated Values) is a simple, plain-text format that stores tabular data where each line represents a row and values are separated by commas (or other delimiters). CSV's simplicity makes it the universal standard for data exchange between different applications, databases, and programming languages. Unlike XLSX, CSV files don't support formatting, formulas, or multiple sheets – they contain only raw data.
Why Convert Excel to CSV?
There are numerous reasons why you might need to convert your Excel files to CSV format:
Universal Compatibility
CSV files can be opened by virtually any spreadsheet application, database system, or programming language. From Python to R, MySQL to MongoDB, every data tool supports CSV.
Smaller File Size
CSV files are significantly smaller than Excel files because they contain only data without formatting, styles, or metadata. This makes them faster to transfer and process.
Database Import
Most database systems (MySQL, PostgreSQL, SQLite, MongoDB) can directly import CSV files. This makes data migration and bulk imports straightforward.
CRM & Marketing Tools
Platforms like Salesforce, HubSpot, Mailchimp, and countless others use CSV as their primary import/export format for contacts, leads, and campaign data.
Common Use Cases
Data Analysis & Science
Data scientists and analysts regularly convert Excel data to CSV for use with Python (pandas), R, or specialized data analysis tools. CSV provides a clean, standardized format that's easy to parse programmatically.
E-Commerce Product Management
Platforms like Shopify, WooCommerce, Amazon Seller Central, and eBay accept CSV files for bulk product uploads and inventory management. Converting product spreadsheets to CSV streamlines catalog management.
Financial & Accounting Data
Accounting software, banking systems, and financial analysis tools often require CSV format for transaction imports, reconciliation, and reporting.
Web Application Integration
Many web applications and APIs accept CSV uploads for bulk data operations. Converting Excel to CSV enables seamless integration with SaaS platforms and custom applications.
Understanding Export Options
Our converter offers several customization options to ensure your CSV output matches your requirements:
Delimiter Options
- Comma (,) – Standard CSV format, widely supported
- Semicolon (;) – Common in European countries where comma is the decimal separator
- Tab – Tab-separated values (TSV), useful for data with commas in content
- Pipe (|) – Alternative separator for specialized systems
Encoding Options
- UTF-8 – Universal encoding supporting all languages and special characters
- UTF-8 with BOM – Includes byte order mark for better Excel compatibility
- ASCII – Basic English-only encoding for legacy systems
Why Choose Our XLSX to CSV Converter?
100% Private
Your files never leave your browser. All processing happens locally on your device using JavaScript.
Instant Results
No upload queues or processing delays. Convert files instantly without waiting.
Works Everywhere
Use on any device – desktop, tablet, or mobile. Works on Chrome, Firefox, Safari, and Edge.
Technical Specifications
| Feature | Specification |
|---|---|
| Supported Input | .xlsx, .xls |
| Output Format | .csv (text/csv) |
| Max File Size | Unlimited (browser memory dependent) |
| Multi-sheet Support | Yes (convert sheets individually) |
| Processing Location | Client-side (your browser) |
| Browser Support | Chrome, Firefox, Safari, Edge, Opera |
| Mobile Support | Yes (iOS and Android) |
Tips for Best Results
- Clean your data first – Remove unnecessary formatting, merged cells, and empty rows before conversion.
- Check formulas – Remember that CSV stores values, not formulas. Ensure calculated values are correct before converting.
- Use UTF-8 BOM for Excel – If you plan to reopen the CSV in Excel, use UTF-8 with BOM encoding to preserve special characters.
- Preview before download – Always check the preview to ensure correct data is being exported.
- Consider your locale – European users should consider semicolon delimiter since comma is often the decimal separator.
Frequently Asked Questions
Everything you need to know about converting Excel to CSV
Ready to Convert Your Excel Files?
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