CSV to Excel— Free & Private
Convert CSV files to Excel (.xlsx) spreadsheets instantly in your browser.
Drop a CSV file here or click to browse
CSV (comma-separated values) files
All processing happens in your browser. No files are uploaded.
What Is CSV to Excel Conversion?
CSV to Excel is a free online tool that convert CSV files to Excel (.xlsx) spreadsheets instantly in your browser. No files are uploaded — everything is processed locally on your device.
This CSV to Excel converter online free transforms a plain-text CSV (Comma-Separated Values) file into a properly formatted Excel spreadsheet (.xlsx). While CSV files can be opened in Excel, they lose formatting, data types, column widths, and formulas in the process. A proper Excel file preserves number formatting, date recognition, text wrapping, and allows multiple sheets, charts, and formulas. This tool parses your CSV data, auto-detects column types (numbers, dates, text), and generates a well-structured .xlsx file — all in your browser. Your data is never uploaded to any server, making it safe for sensitive financial, medical, or business data.
Privacy guarantee: CSV to Excel processes all files directly in your browser using WebAssembly. No data is uploaded to any server, no information is collected, and the tool works offline after loading. Unlimited usage with no signup, no watermarks, and no file size limits.
How to Use CSV to Excel
Upload your CSV file
Select a CSV file from your device or drag it into the upload area. Any delimiter (comma, semicolon, tab) is auto-detected.
Configure parsing options
Review the parsed data table. Adjust column types, delimiter settings, or encoding if needed.
Download Excel file
Click Convert to generate and download the .xlsx spreadsheet file.
Why Use Our CSV to Excel Converter?
Frequently Asked Questions
Why not just open the CSV file directly in Excel?
Opening a CSV in Excel often causes data corruption: long numbers become scientific notation (e.g., "1234567890123" becomes "1.23E+12"), leading zeros are stripped from IDs and ZIP codes, and dates in non-US formats are misinterpreted. This converter preserves data types correctly.
What delimiters does this tool support?
The converter auto-detects commas, semicolons, tabs, and pipe characters as delimiters. You can also manually select the delimiter if auto-detection doesn't match your file format.
Can I convert multiple CSV files at once?
Currently the tool processes one CSV file at a time. Each CSV is converted to a single-sheet Excel workbook. For batch conversion, process files one after another.
Is my data safe during conversion?
Yes. All processing happens locally in your browser using SheetJS. No data is sent to any server. This makes it safe for confidential business data, financial records, and personal information.
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