Office tool / 09
XLSX to CSV Converter
Export the active sheet of any Excel spreadsheet into a clean, comma-separated CSV file ready for database imports and data analysis.
How to convert Excel spreadsheets to CSV
Select Workbook
Upload your Microsoft Excel `.xlsx` or `.xls` file from your computer or phone.
Convert Spreadsheet
Click "Convert to CSV". SheetJS parses the binary tabular data and structures clean comma-delimited rows.
Download CSV
Inspect the generated preview text in your browser, then download your `.csv` file with one click.
Your sales reports, payroll data, and customer spreadsheets are never transmitted over the internet to any external server. Everything is decoded locally in browser RAM.
Why convert Excel spreadsheets to CSV?
CSV (Comma-Separated Values) is the universal lingua franca for modern software, cloud databases, and data science:
Database Ingestion
Easily import tabular data into SQL databases (PostgreSQL, MySQL, SQLite) and cloud warehouses (BigQuery, Snowflake) without Excel parsing errors.
Data Science & Analytics
Standard input format for Python (Pandas, NumPy), R, Jupyter Notebooks, and machine learning pipelines.
No Proprietary Formatting Bugs
Strips away hidden macro scripts, confusing cell merges, and styling rules, leaving clean plain-text data.
Lightweight & Universal
CSV files are a fraction of the size of XLSX workbooks and can be inspected in any plain-text editor like Notepad or VS Code.
Frequently Asked Questions
Which worksheet is converted if my workbook has multiple tabs?
The converter extracts the first (active) worksheet of the uploaded Excel workbook.
Does it support older .xls spreadsheets?
Yes. The SheetJS parser supports both legacy Excel 97-2004 (`.xls`) and modern OpenXML (`.xlsx`) files.
Are formulas or calculated values exported?
The converter exports the evaluated values of cells so you get the actual final computed data, rather than raw formula strings.