Processed locally — your file never leaves your device
CSV to Excel Converter
Convert a CSV or TSV file into an XLSX workbook, entirely in your browser.
CSV
Drop a spreadsheet or data file hereor click to choose a file from your deviceNothing is uploaded — everything happens on your device.
How it works
- Select or drop a .csv file.
- Your browser reads and parses it locally — nothing is uploaded.
- An .xlsx workbook is built from the parsed data, entirely on your device.
- Download the result directly from your browser.
Frequently asked questions
- Is my CSV file uploaded to a server?
- No. The conversion — parsing the CSV and building the XLSX file — happens entirely on your device.
- Does it handle different delimiters?
- Yes. The delimiter (comma, tab, semicolon or pipe) is auto-detected from the file's content before conversion.
- Will number and date-like text be converted to real Excel values?
- Values are written into the workbook as the text your CSV contained. If you need them recognized as native Excel numbers or dates, format the column in Excel afterwards using its data type tools.
- Is there a file size limit?
- There's no server upload limit, since nothing is uploaded. The practical maximum depends on your device's memory and browser.
- What if my CSV has malformed rows?
- Rows with more or fewer values than the header are handled gracefully — extra values are dropped and a warning is shown — rather than failing the whole conversion.