Convert CSV to XLSX Online Free
Turn plain CSV data into a proper Excel spreadsheet. Columns are auto-detected, data types are preserved, and the result opens directly in Excel or Google Sheets.
To convert CSV to XLSX, drop your .csv file onto the converter. Your data is parsed with PapaParse and written to an Excel workbook using SheetJS. The conversion is instant, runs in your browser, and your data stays private.
Convert CSV to XLSX
Drop your CSV file here to convert it instantly
Drag & drop your .csv file here, or click to browse
Your file never leaves your browser
CSV vs XLSX: Format Comparison
Key differences between the two formats
When to Convert
Common scenarios where this conversion is useful
Creating reports from raw data
Transform CSV exports from databases or APIs into formatted Excel reports that stakeholders can open, sort, and filter without technical knowledge.
Sharing data with non-technical users
Excel is the universal business format. Convert your CSV data to XLSX so anyone with Excel or Google Sheets can open and work with it.
Preparing data for Excel-based workflows
Many business processes rely on Excel templates. Convert CSV data to XLSX to feed into existing Excel-based workflows, macros, or pivot tables.
Preserving numeric and date types
When CSV is opened directly in Excel, numbers may be misinterpreted as text and dates may be reformatted. Converting properly ensures correct data type handling.
How to Convert CSV to XLSX
-
1
Upload your CSV file
Drag and drop your .csv file onto the converter, or click to browse. Both comma-separated and semicolon-separated formats are auto-detected.
-
2
Automatic conversion
Your CSV is parsed, columns are detected, and the data is written into a proper Excel workbook with the correct cell types.
-
3
Download the Excel file
Click Download to save your .xlsx file. Open it in Excel, Google Sheets, LibreOffice Calc, or any compatible spreadsheet application.
Frequently Asked Questions
Yes. The converter detects numeric values in your CSV and stores them as proper numbers in Excel, so they work correctly with formulas and sorting.
Date-like values are detected and stored as Excel date cells. Common formats like YYYY-MM-DD, MM/DD/YYYY, and ISO 8601 are recognized automatically.
The parser auto-detects the delimiter. Semicolons, tabs, and pipes are all recognized in addition to commas.
Yes. Files with hundreds of thousands of rows convert successfully. Performance depends on your device's memory, but modern browsers handle multi-megabyte CSV files well.
The output is a clean, unformatted spreadsheet. The first row from your CSV becomes the first row of the Excel sheet. You can add formatting after opening in Excel.
Yes. The converter fully supports UTF-8 encoding, including accented characters, CJK characters, emojis, and all Unicode text.
Headers are treated as regular data in the first row of the spreadsheet. The converter does not add special header formatting, but you can bold the first row in Excel.
No. The converter creates the XLSX file entirely in your browser. You only need Excel (or Google Sheets, LibreOffice) to open the resulting file.
Yes. The conversion happens entirely in your browser. Your CSV data is never uploaded to any server.
Related Conversions
Ready to convert your file?
Convert CSV to XLSX instantly - free, private, no signup required.
Start Converting