CSV and Excel Converter
Convert a CSV table into a single-sheet XLSX workbook, or export the first worksheet in an Excel workbook as a CSV file.
Convert between CSV and Excel XLSX files in your browser. CSV becomes a single-sheet workbook; XLSX exports its first worksheet to CSV.
Files are processed locally. Only the first worksheet is exported; formulas, formatting, charts and multiple-sheet structure are not preserved in CSV. Maximum file size 20 MB.
🔒 All processing happens in your browser — files never leave your device. Your input stays in this browser and is not uploaded to Smart Online Tools.
How it works
- Choose a CSV or XLSX file.
- Select the matching conversion button.
- Download and check the converted file.
Good to know: CSV files contain plain table data, so styles, formulas, charts, and multiple sheets are not retained. XLSX to CSV exports only the first worksheet. Files are limited to 20 MB, 10,000 rows, and 200 columns.
Privacy and processing
Your input stays in this browser and is not uploaded to Smart Online Tools.
Frequently asked questions
Will CSV preserve formulas?
No. CSV stores displayed values as text and does not preserve workbook formulas or formatting.
Does XLSX to CSV export every worksheet?
This tool exports the first worksheet only. Save each needed sheet separately before conversion.
What does CSV and Excel Converter do?
Convert CSV files to Excel workbooks and export XLSX sheets to CSV. Convert a CSV table into a single-sheet XLSX workbook, or export the first worksheet in an Excel workbook as a CSV file.
Does this tool upload my files or input?
Your input stays in this browser and is not uploaded to Smart Online Tools.
What should I know before using this tool?
CSV files contain plain table data, so styles, formulas, charts, and multiple sheets are not retained. XLSX to CSV exports only the first worksheet. Files are limited to 20 MB, 10,000 rows, and 200 columns.