CSV to Excel converter

CSV to Excel converter

Opening a CSV directly in Excel can turn 00042 into 42 or round a long tracking number. Upload the original UTF-8 CSV, select its separator and convert it into an XLSX workbook whose cells are all text. The preview shows the first rows before you download. Text cells preserve IDs, postcodes and phone numbers exactly as the source CSV stores them. You can also paste a short CSV. If Excel already changed and saved the source values, the missing digits cannot be recovered.

How to use this tool

1. Upload a UTF-8 CSV or TSV, drag it into the dropzone, import a direct public file URL, or paste a short table after the or separator. Try the sample with leading-zero IDs.
2. Choose the source column separator and create the workbook. Review the first rows in the preview for IDs, postal codes and long numbers.
3. Download the XLSX and open it in Excel. Every cell is stored as text, so leading zeros and long identifiers remain unchanged.

Output and limitations

Convert CSV to XLSX online while preserving leading zeros, long IDs, phone numbers and postal codes as text in Excel.

Upload one UTF-8 CSV or TSV up to 5 MB, drag it into the upload area, import a direct public URL, or paste up to 12,000 characters after the or separator. Choose comma, semicolon, tab or pipe as the source separator. Every workbook cell is saved as text, including values that look numeric or like formulas; the tool does not infer dates or calculate formulas. This protects leading zeros and long identifiers when the XLSX opens in Excel. It accepts up to 10,000 data rows, 100 columns and 200,000 cell positions; output is capped at 20 MB. Blank rows are omitted. If the source CSV has already lost zeros or digits, this tool cannot restore them. Convert non-UTF-8 files with the CSV encoding converter first. File processing happens in your browser unless you choose URL import.