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Convert CSV to XLSX
An export from a database, a bank or an analytics tool is a CSV that has to become a workbook someone can actually work in.
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What actually changes
CSV and XLSX are not the same picture in two wrappers.
Rows and fields become worksheet cells with detected types, so numbers sum and dates sort. The result is a proper XLSX with a header row rather than a text file Excel keeps re-interpreting on open.
Worth knowing first
Type detection is a guess, and it guesses wrong in the same three places every time: long numeric IDs become scientific notation, values with leading zeros lose them, and ambiguous dates flip between day-first and month-first depending on locale.
Questions
CSV to XLSX, answered
What if my file uses semicolons?
Common in European exports where the comma is the decimal separator. The delimiter is detected from the file rather than assumed.
Why do my accented characters look wrong?
The CSV was not UTF-8, or it lacked a byte order mark and Excel assumed the local code page. Re-save as UTF-8 with BOM.
Is there a row limit?
XLSX holds 1,048,576 rows. A larger CSV has to be split or loaded into a database instead.
How to convert CSV to XLSX
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Choose your settings
Excel Workbook is lossless, so nothing is thrown away in the conversion.
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Download
Converted and deleted the moment it finishes. Never written to permanent storage.