Free tool
Drop one or many .csv files -- each becomes its own sheet in a single .xlsx workbook. Name your sheets, pick the delimiter, then choose how the output should look -- auto-fit columns, bold headers, frozen top row, alternating row colors, header background, font. Need the reverse? Try our Excel to CSV converter.
CSVs are parsed and the workbook is built in your browser. Nothing is uploaded.
Sheets (1)
Sheet 1
How it works
1. Drop or paste CSVs
Drop one or more files into the drop zone, or paste CSV directly into a sheet card. Each CSV becomes a sheet in the output.
2. Configure the look
Rename sheets, set delimiters, then open Output Options. Toggle auto-fit, bold headers, freeze, alternating rows, and pick colors and font.
3. Download .xlsx
One click produces a styled Excel workbook. Custom filename, opens cleanly in Excel, LibreOffice, and Google Sheets.
Why use this converter
- Multi-sheet in one click. Drop several CSVs at once -- each becomes its own named sheet in a single workbook. No manual combining.
- Real formatting. Auto-fit columns, bold headers, frozen top row, alternating row colors with custom accent, header background and text colors, font picker.
- Smart delimiter detection. Comma, semicolon, tab, pipe -- auto-detected per CSV with manual override when you need it.
- Private by design. Your data is parsed and the .xlsx is generated entirely in your browser. Nothing is uploaded, logged, or stored.
- Live preview. See exactly how each sheet parses before you download. Spot quoting and delimiter issues instantly.
- Free forever. No signup, no rate limits, no paywall.
Need more than conversion?
If your team keeps emailing CSVs back and forth because there is no shared place to capture data exports, you might want a proper intake queue. We are building one.
Learn about the Workforge intake queue