Convert CSV to Excel — fast XLSX conversion in your browser
Turn CSV exports into Excel spreadsheets for analysis and sharing. Works with comma- and semicolon-separated files and keeps your data private with local processing.
CSV to Excel Converter
How it works
This tool reads your CSV locally, parses rows and columns, and then generates an Excel (.xlsx) file using SheetJS. It works well for exports from databases, portals, and reporting systems, including Italian datasets that often use semicolon delimiters.
- Use Auto-detect first; switch delimiter if columns look wrong.
- Large CSV files can take longer to parse — consider filtering rows before converting.
- Your data stays in the browser. No upload is required.
Related tools
Tips & Troubleshooting
These quick notes help you get clean, reliable results with Convert CSV to Excel — fast XLSX conversion in your browser—especially when you’re uploading to forms, emailing files, or preparing documents for submission.
Best results
- Use UTF‑8 encoding when converting CSV/JSON so special characters stay intact.
- Standardize headers before converting—consistent columns prevent broken outputs.
- Export a small sample first to confirm the formatting before converting a large file.
- After conversion, open the output once to confirm columns, dates, and decimals.
Troubleshooting
- If columns shift in CSV, values may contain commas—ensure they are quoted properly.
- If JSON is nested, flattening may be needed before conversion to CSV.
- If dates change formats, set the column format in Excel after import.
- If output looks garbled, re-save your source as UTF‑8 and retry.
Privacy
Privacy note: processing runs locally in your browser. Your files stay on your device unless you choose to download the result.
Related reading
FAQ
CSV files contain values only (no formulas). The Excel file will contain the same values and columns from the CSV.
No. Conversion happens in your browser.
Select the semicolon delimiter (;), which is common for European exports.