CSV to Excel Converter: Make XLSX Files
This CSV to Excel converter turns comma, semicolon, tab or pipe separated data into a real .xlsx workbook that opens in Excel, Google Sheets, Numbers and LibreOffice. Open a CSV file or paste your data, check the preview, and download. The delimiter is detected for you and you can change it, numbers and dates stay numeric so formulas work, leading zeros can be kept as text, filter buttons can be added to the header row, and columns are sized to fit. The conversion happens in your browser, so private spreadsheets are never uploaded.
CSV to Excel Converter
Convert a CSV, TSV or pasted data into a real Excel .xlsx file. Detects delimiters and numbers.
How to use the CSV to Excel Converter
- Open or drag in a CSV file, or paste data.
- Check the delimiter and the preview table.
- Choose options such as header filters and keeping numbers as text.
- Press Download Excel file.
Features
- Real .xlsx workbook output
- Auto-detects comma, semicolon, tab and pipe
- Numbers stay numbers for formulas
- Option to keep leading zeros
- Header filter buttons and auto column widths
- Runs in your browser, no upload
Frequently asked questions
Does the file open in Excel?
Yes. The output is a standard .xlsx workbook that opens in Excel, Google Sheets, Numbers and LibreOffice.
Why do some CSV files show everything in one column?
The file may use semicolons or tabs. The tool detects this, and you can pick the right delimiter by hand if needed.
How do I keep leading zeros, like ZIP codes?
Turn on "Keep all values as text". Then 01234 stays 01234 instead of becoming 1234.
Can it handle commas inside quotes?
Yes. Quoted fields with commas, quotes and line breaks are parsed correctly.
Is my data uploaded?
No. The conversion runs on your device. The Excel library loads once, then your data is processed locally.