CSV to XLSX
Convert CSV to Excel file right in your browser. You can merge several CSV into one XLSX.
- Up to 10 CSV files at a time
- File size — up to 10 MB each
- Each CSV becomes a separate Excel sheet
Done! Excel file created:
About CSV to XLSX converter
CSV is a simple text format for tabular data, but it doesn't support formulas, formatting or multiple sheets. XLSX (Excel) — on the contrary, is a full-featured format for working with tables. If you exported data from a database to CSV and want to open it in Excel with formatting capabilities — converting to XLSX is the right step.
Our converter transforms CSV to XLSX right in your browser. The file is not sent to the server — all processing happens on your device. This means your data stays private and no one but you has access to it.
What the converter can do
- Multiple CSV: each file becomes a separate Excel sheet.
- Auto-detect delimiter: comma, semicolon, tab.
- Auto-detect encoding: UTF-8 and Windows-1251 (Excel).
- Auto-fit columns: Excel file is ready to work right away.
- Correct Cyrillic: Russian letters display correctly.
- Privacy: files are not uploaded to server.
How to use
- Drop one or several CSV files into the upload zone.
- Choose delimiter and encoding (or leave "Auto-detect").
- Click "Convert to XLSX".
- Download the ready Excel file.
Frequently asked questions
Where do my files go? Nowhere. Files are processed in your browser's memory and disappear when you close the page.
What if I have several CSV? Each becomes a separate sheet in one Excel file.
Garbled text instead of Russian letters — what to do? Choose encoding Windows-1251 (Excel) — most CSV from Excel are saved in it.
Will formulas be saved? No. CSV doesn't contain formulas — only values. The Excel file will have values that can be used in formulas.