CSV to XLS Converter

Convert CSV to XLS online, for free.



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How to Convert CSV to XLS?

  1. Click the “Choose Files” button to select your CSV files.
  2. Click the “Convert to XLS” button to start the conversion.
  3. When the status change to “Done” click the “Download XLS” button

Easy to Use

Simply upload your CSV files and click the convert button. You can also batch convert CSV to XLS format.

Best Quality

We use both open source and custom software to make sure our conversions are of the highest quality. In most cases, you can fine-tune conversion parameters using “Advanced Settings” (optional, look for the icon).

Free & Secure

Our CSV to XLS Converter is free and works on any web browser. We guarantee file security and privacy. Files are protected with 256-bit SSL encryption and automatically deleted after 8 hours.


Comma-Separated Values (CSV) is a plain-text format for tabular data. Each line is a row, and commas separate the columns, with the first line usually holding the column headings. There is no formatting, no formulas, and no multiple sheets — just the data itself. That simplicity is the point: almost every spreadsheet program, database, and analytics tool in existence can import and export CSV, which makes it the default choice for moving data between systems.

 

How to open a CSV file?

Microsoft Excel, Google Sheets, and LibreOffice Calc all open CSV files directly and lay them out as a proper table.

 

Watch out for two common problems: Excel may convert long numbers or codes into dates, and files that use semicolons or tabs instead of commas need the right delimiter chosen during import. Use the Data → From Text/CSV import wizard rather than double-clicking to control this. To see the raw contents, open the file in any text editor, or convert it with our CSV to XLSX tool.

 

Developed by: No single vendor — formalised in RFC 4180

Initial Release: 1972


Excel 97-2003 Workbook (XLS) is the original binary spreadsheet format of Microsoft Excel, built on the Binary Interchange File Format and used as the default until Excel 2007. An XLS stores worksheets, formulas, charts, and formatting in one proprietary file, and it can also carry VBA macros. Its main limitations are a ceiling of 65,536 rows per sheet and a greater risk of file corruption than the newer XLSX.

 

How to open an XLS file?

Current versions of Excel still open XLS in Compatibility Mode and offer to upgrade the file to XLSX.

 

LibreOffice Calc, Google Sheets, and Apple Numbers all read XLS. Because XLS files can contain macros, treat unexpected attachments with caution. Converting your archive keeps it safe and compact — our XLS to XLSX and XLS to PDF tools handle the job.

 

Developed by: Microsoft

Initial Release: 1987

Freeconvert.me can convert your other files to XLS format:

Freeconvert.me can convert your CSV files to these other formats:


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At FreeConvert, we go beyond just converting files—we protect them. Our robust security framework ensures that your data is always safe, whether you're converting an image, video, or document. With advanced encryption, secure data centers, and vigilant monitoring, we've covered every aspect of your data's safety.

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