About the CSV to Excel Converter
Opening a CSV in Excel often goes wrong: the delimiter is guessed, leading zeros vanish, accented characters break. Converting to a genuine .xlsx file avoids all of that. This tool parses the CSV with a proper RFC 4180 parser, auto-detecting the delimiter, and writes an Office Open XML workbook: one sheet, the header row first, numeric-looking cells stored as numbers so they sum correctly, and everything else as text. Values with leading zeros are kept as text on purpose.
The workbook is assembled directly in your browser without a spreadsheet library, so the file never leaves your device; that matters for exports containing customer or financial data. Click Download to save it; the summary on the right confirms the row and column count.
The file opens in Excel, LibreOffice, Numbers and Google Sheets. It contains plain values, not formulas or formatting, which is what a data handoff usually needs. For the reverse direction, Excel to CSV reads a workbook back; for JSON, JSON to Excel takes the same route from an array of objects.
How to use
- Paste CSV or upload a .csv file.
- Check the delimiter and set a sheet name if you like.
- Click Download to save the .xlsx file.
Common questions
- Is the file a real Excel workbook?
- Yes. It is an Office Open XML (.xlsx) file that Excel, LibreOffice, Numbers and Google Sheets open natively.
- Are numbers stored as numbers?
- Yes, so they sum and sort correctly. Values with leading zeros, such as postcodes, are kept as text.
- Does it support several sheets?
- One sheet per conversion. Convert each CSV separately and combine in Excel if needed.
- Is anything uploaded?
- No. The workbook is built by JavaScript in your browser.