How to use the CSV to Excel converter
- Pick the CSV, ODS or XLS files.
- Convert them to XLSX.
- Open the workbook in Excel and add totals, filters or formatting.
Reading a CSV export
Input is treated as UTF-8 text, commas mark the column boundaries, and double quotes around any field that itself contains a comma or a line break, which matches what most systems produce. Accented names and non-Latin scripts arrive intact instead of the scrambled characters Excel can show when it opens such a CSV by double-click.
Anything that looks like a number or a date is stored as one, so sorting and sums work straight away. The same rule drops leading zeros from codes such as postcodes, account numbers or phone numbers, so keep the CSV when those must stay exact.
Upgrading ODS and XLS workbooks
ODS and XLS files keep every sheet, formula, cell format, merged range and chart when written as XLSX. An XLS sheet stops at 65,536 rows, whereas XLSX allows roughly a million, so the upgrade lifts that ceiling for future data.
Files that use semicolons between values, a habit of many European systems, stay in a single column. Replace the semicolons in a text editor first, or use Excel’s import dialog with the semicolon option.
Upload and removal
Building the workbook uses LibreOffice on our server, so the file is sent over HTTPS and converted in an isolated process.
The CSV and the XLSX are deleted right after the converted file is returned; no copy is stored.
Questions
Will formulas be added to my data?
No. The workbook contains exactly the values from your CSV. Totals, filters and formulas are yours to add once it is open in Excel.
Can I convert several exports in one go?
Yes. Add every CSV, ODS or XLS file you have; each becomes its own XLSX, and the whole batch can be saved as a ZIP.
How big can the CSV be?
Up to 95 MB, and no more rows than an XLSX sheet holds, about a million.
Why did my product codes lose their zeros?
They were read as numbers. Keep the original CSV, or format that column as text after importing it into Excel yourself.