Convert XLS to CSV Online
Limited to 65,536 rows and 256 columns — a fraction of the 1M+ rows in modern XLSX files. Converting to CSV gives you a key advantage: universal data interchange — every database, spreadsheet, programming language, and data tool can read and write csv. CSV is best for exchanging tabular data between databases, spreadsheets, and programming languages with maximum compatibility.
Why Convert XLS to CSV?
Limited to 65,536 rows and 256 columns — a fraction of the 1M+ rows in modern XLSX files — converting to CSV overcomes this by providing universal data interchange — every database, spreadsheet, programming language, and data tool can read and write csv
CSV is the right choice when you need to: importing and exporting data between databases, crms, and analytics tools
Gain broader compatibility — CSV works with Everything — Excel, Google Sheets, Python, R, SQL databases, command-line tools, every programming language
Your XLS files were created for maintaining backward compatibility with enterprises still using office 2003, but now you need a format suited to different workflows
XLS vs CSV — Format Comparison
Microsoft Excel Binary Spreadsheet (.xls)
Comma-Separated Values (.csv)
How to Convert XLS to CSV
Upload your XLS file
Drag your .xls file onto the upload area or click to browse. We accept XLS files up to 100 MB.
Choose CSV as output format
Select .csv (Comma-Separated Values) from the format list. Configure any format-specific settings to match your requirements.
Convert and download
Click Convert and wait for processing. Your CSV file will be ready to download in seconds. The result is optimized for exchanging tabular data between databases, spreadsheets, and programming languages with maximum compatibility.
Frequently Asked Questions
Is the XLS to CSV conversion lossless?
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When both formats support lossless data, the conversion preserves all content. Raw tabular data with no formatting; encoding and delimiter conventions vary by locale.
How large will my CSV file be compared to the original XLS?
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XLS files are typically 50 KB – 30 MB, while CSV files are typically 1 KB – 100 MB. The actual size depends on content complexity and any quality settings you choose.
What software can open the converted CSV file?
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CSV is compatible with: Everything — Excel, Google Sheets, Python, R, SQL databases, command-line tools, every programming language.
What is the maximum file size I can convert?
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PureConverter accepts XLS files up to 100 MB. Your files are processed securely and deleted from our servers after conversion.
What's the difference between XLS and CSV?
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XLS (Microsoft Excel Binary Spreadsheet) is best for opening legacy excel 97-2003 spreadsheets from older business systems and archives. CSV (Comma-Separated Values) is best for exchanging tabular data between databases, spreadsheets, and programming languages with maximum compatibility. Key tradeoff: XLS's advantage is binary format that loads faster than xlsx for very large files, with backward compatibility to excel 97, while CSV's advantage is universal data interchange — every database, spreadsheet, programming language, and data tool can read and write csv.
Pro Tips for XLS to CSV Conversion
Review the output CSV file to ensure all formatting and content transferred correctly from your XLS source
Keep a backup of your original XLS file — while our conversion is reliable, having the source is always recommended
CSV works especially well for: migrating data between saas platforms that support csv import/export
Did you know? Despite being called "Comma-Separated Values," many European countries use semicolons as delimiters because the comma is their decimal separator — a German CSV file and an American CSV file are structurally different.
Ready to Convert?
Upload your XLS file above and get your CSV in seconds. Free, fast, and secure.