UlvixorCSV to Excel Converter
Paste your CSV and download a ready-to-use Excel (.xlsx) file, generated entirely in your browser. Perfect for converting data exported from another system without needing Excel or any online service.
How it works
- Paste or type your CSV into the input panel (or use the built-in example).
- The tool uses the first row as the column headers and validates the CSV format.
- A summary shows the number of rows and columns detected.
- Click 'Download Excel (.xlsx)' to generate and download the file straight to your device.
Use cases
- Convert a CSV export from a system that doesn't generate Excel files directly.
- Prepare an .xlsx file to share with colleagues who work mainly in Excel.
- Turn data copied from a webpage or API into a spreadsheet ready for analysis.
- Migrate tabular data into a format compatible with Microsoft Excel or Google Sheets.
Use cases
- Convert a CSV export from a system that doesn't generate Excel files directly.
- Prepare an .xlsx file to share with colleagues who work mainly in Excel.
- Turn data copied from a webpage or API into a spreadsheet ready for analysis.
- Migrate tabular data into a format compatible with Microsoft Excel or Google Sheets.
Common mistakes
- Expecting the generated .xlsx to preserve formulas or styling you 'imagined' were in the original CSV.CSV is plain text with no formulas or visual formatting, so the generated file only contains the raw values, with no bold text, colors, or formulas.
- Leaving a field with commas unwrapped in double quotes.A value like Madrid, Spain without quotes gets interpreted as extra columns. Wrap that field in double quotes before pasting the CSV; the parser follows the CSV standard.
- Expecting to choose the sheet name before downloading the file.The file is generated with a single sheet named 'Data'. You can rename it after opening it in Excel or Google Sheets.
Frequently asked questions
No. The entire process, from reading the CSV to generating the .xlsx file, happens in your browser using the xlsx (SheetJS) library. Your file is never uploaded anywhere.
If a field contains commas, it must be wrapped in double quotes (for example "Madrid, Spain"). The parser follows the CSV standard and correctly handles quoted fields.
The tool generates a sheet where each cell is interpreted based on its content: numeric values are recognized as numbers and everything else as text, just like pasting data directly into Excel.
The generated file uses a single sheet named 'Data'. You can easily rename it after opening the file in Excel or Google Sheets.
There's no fixed limit — your browser can handle files several megabytes in size. For very large files, performance depends on your device's available memory.
Alternatives
You can open the CSV directly in Excel and use 'Save As' to get an .xlsx file, or in Python use pandas.read_csv(...).to_excel(...). This tool generates the file in one click, with no Excel to open or code to write.