CSV to Excel
Turn CSVs into Excel-ready files with smart type detection and a frozen header row.
Drop a CSV file
we'll auto-type numbers and dates so Excel filters work
CSV is the lowest-common-denominator data format — readable by everything, but tricky in Excel because it guesses column types and often gets them wrong. Converterzilla's CSV-to-Excel converter applies smart type detection up front so numeric, date and text columns end up in the right type.
How to use CSV to Excel in your browser
- Upload your CSV. Drop a .csv file. We auto-detect delimiter (comma, semicolon, tab) and quoting style.
- Review type inference. Preview each column with detected type — override if needed before export.
- Download the Excel file. Save .xlsx with proper types, a frozen header row, and auto-fit column widths.
Why use Converterzilla for CSV to Excel
Auto-detect delimiter
CSV, TSV and semicolon-delimited files all work without manual configuration.
Smart type inference
Numbers, dates and booleans get correct Excel types — no more leading zeros vanishing.
Encoding-safe
UTF-8 with BOM by default so international characters and emoji display correctly.
Frequently asked questions about CSV to Excel
Excel's CSV import quietly mangles leading zeros, dates in non-US format, and very long numbers. We get them right.
Yes — set the column type to Text in the preview before exporting.
Up to 50 MB at launch. We'll handle larger via streaming in a later release.