CSV to Excel

Convert CSV to Excel online for free — turn CSV and TSV files (or pasted text) into a proper XLSX workbook with automatic column widths. The separator is detected automatically, and several CSV files can be combined into one workbook with a sheet each. Runs in your browser; nothing is uploaded.

100% private — everything runs in your browser. Conversion happens on your device; nothing is uploaded.

Drop CSV filesCSV or TSV · select several for a multi-sheet workbook

…or paste CSV text

Paste here

Converted in your browser with SheetJS — your data never leaves your device. Excel formulas are exported as their calculated values; formatting such as colours and merged cells isn’t carried into CSV or JSON.

How to convert CSV to Excel

Drop one or more CSV files (or paste CSV text).
Check the preview.
Click Download Excel (.xlsx).
Open the workbook in Excel, Google Sheets or Numbers.

What you can use it for

Turn exports from apps and websites into real spreadsheets
Combine several CSV reports into one workbook
Avoid Excel mangling leading zeros and dates when opening CSVs
Share data with colleagues who prefer Excel

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Frequently asked questions

How do I convert CSV to XLSX?

Drop the CSV in and click Download Excel. The separator (comma, semicolon or tab) is detected automatically.

Can I combine several CSV files?

Yes — select several files at once and each becomes its own sheet, named after the file.

Why convert instead of opening the CSV in Excel?

Opening a CSV directly can strip leading zeros and misread dates or decimals depending on your region. A converted XLSX keeps the values as they appear in the CSV.

Is my data uploaded?

No. The conversion runs in your browser with the open-source SheetJS library, so spreadsheets with customer or financial data stay on your device.

What about formulas and formatting?

Formulas are exported as their calculated values. Colours, fonts and merged cells aren't part of CSV or JSON, so they aren't carried over.