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CSV to XLS Converter

Convert CSV files to the legacy Excel .xls (97-2003) format — free and private in your browser.

Drop your file here or click to upload

Supports CSV, TSV, TXT files up to 100MB

Tip: select multiple CSV files to combine them into one workbook, one sheet per file.

How to Convert

  1. Upload one or more CSV files, or paste your CSV data
  2. Preview the data and adjust formatting options
  3. Click Convert to generate the .xls workbook
  4. Download your Excel file

Features

  • Outputs legacy .xls (Excel 97-2003) workbooks
  • Combine multiple CSV files into one workbook, one sheet per file
  • Auto-fit column widths and a bold header row
  • Auto-detects the delimiter (comma, semicolon, tab)
  • Runs entirely in your browser — files never leave your device

Use Cases

  • Produce a .xls file for Excel 97-2003 or older software
  • Send a legacy-format spreadsheet to a system that cannot read .xlsx
  • Open CSV data in an older version of Excel with proper columns

Frequently Asked Questions

When should I use .xls instead of .xlsx?

Use .xls only when you need to open the file in Excel 97-2003 or an older application that cannot read the modern .xlsx format. Otherwise .xlsx is recommended — try our CSV to XLSX converter.

Will the .xls file open in modern Excel?

Yes. Modern versions of Excel, Google Sheets, and LibreOffice all still open .xls files.

Can I combine multiple CSVs into one .xls workbook?

Yes. Select several CSV files and each becomes its own sheet in a single .xls workbook.

Is my data uploaded anywhere?

Never. The conversion runs locally in your browser, so your data stays private and works offline.

Related Tools

XLS to CSV Converter

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CSV to Excel Converter

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CSV to XLSX Converter

Convert CSV files to the modern Excel .xlsx format — free, private, and instant in your browser.

CSV Viewer

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Need to convert the other way? Try our Xls To Csv