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Convert a CSV file to an Excel spreadsheet — free.
Updated
Turn a raw CSV file into a real Excel spreadsheet (.xlsx) — with the data split into proper columns you can sort, filter, and format, and numbers stored as real numbers. It's free with no sign-up, and it runs entirely in your browser, so your file is never uploaded.
Drop a CSV file, or click to browse
Converts to Excel (.xlsx) in your browser — nothing is uploaded.
Free, no sign-up. Runs entirely in your browser — your file is never uploaded.
Runs entirely in your browser — nothing is uploaded.
A CSV file is plain text with one row per line and commas between values; an XLSX file is a zipped bundle of XML that Excel, Google Sheets, and LibreOffice open natively with real columns and cell types. This converter reads a comma-separated file in your browser, parses it following the CSV standard so quoted fields, doubled quotes, and line breaks inside quotes are handled correctly, and writes a single-sheet workbook without uploading anything. Plain integers and decimals become numeric cells you can sum and sort; everything else stays text, which means ZIP codes and IDs keep their leading zeros and dates are left as written rather than reinterpreted. Only comma delimiters are supported, so semicolon or tab-separated files will land in one column. The first row is written like any other, with no bold header or filter applied. There is no size limit, the output keeps your file's name with an .xlsx extension, and you see the row and column count before downloading.
Yes — the conversion happens right in your browser, so it's completely free with no account and no watermark.
No — your CSV is read and converted locally in your browser and never leaves your device.
CSV is just plain text; XLSX is a full Excel workbook with typed cells. Converting stores numbers as numbers and makes the data easier to sort, filter, and format in Excel.
The parser splits on commas only and does not detect other delimiters. Open the file in a text editor or spreadsheet and re-export it as comma-separated CSV, then convert again. Quoted fields containing commas are handled correctly, so values with embedded commas are safe.