CSV to Excel
100% private — runs on your device, never uploaded. Works offline once loaded.
Opening a CSV directly in Excel is where leading zeros vanish from ZIP codes and phone numbers, long IDs turn into 1.23E+15, and dates are guessed in the wrong day-month order. Converting first avoids the guesswork: the file’s delimiter, numbers and ISO dates are detected by a proper CSV reader, and the result is a real .xlsx workbook with typed columns. Convert one file, or several at once as a ZIP of workbooks. Everything happens inside your browser; nothing is uploaded.
Frequently asked questions
Is my file uploaded?
No. The conversion happens inside your browser tab.
Will leading zeros be kept?
A column whose values have leading zeros, like 00742, is read as text, so the zeros are kept. A column of plain numbers becomes a number column.
Is there a row limit?
Excel allows 1,048,576 rows per sheet, so a larger file is refused rather than silently cut short. Use Split CSV to break it into parts first.
Can I convert several CSV files into one workbook with a sheet each?
Not yet — each file becomes its own workbook. To combine the rows of several CSV files into one sheet, use Merge CSV Files.
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