How to Convert CSV to Excel (Keep Your Columns)

Open a CSV in Excel and it often looks wrong — everything crammed into one column, numbers turned into dates, or leading zeros dropped. Converting the CSV to a real Excel workbook (.xlsx) fixes the structure so the data lands in proper, typed columns you can actually work with. Here's the reliable way to do it.

Convert CSV to Excel in three steps

Use the CSV to Excel converter:

1. Open CSV to Excel and choose your .csv file.
2. Click Convert to Excel.
3. Download the .xlsx spreadsheet — columns intact.

Can't I just rename .csv to .xlsx?

No — and it usually breaks. A CSV is plain text with values separated by commas; an XLSX is a structured, zipped workbook format. Renaming the extension doesn't change the contents, so Excel either refuses to open it or shows garbled data. A real conversion rewrites the data into the XLSX structure, which is what this tool does.

CSV vs. XLSX — what's the difference?

• CSV is universal and tiny, but it's just text: no formatting, formulas, or multiple sheets, and no idea what's a number vs. text.
• XLSX is a full Excel workbook: typed cells, formatting, formulas, and multiple tabs. It's what you want for actually working with the data.

Tips to avoid mangled data

• Watch leading zeros. Codes like ZIP or product IDs can lose their leading zeros — once in Excel, format those columns as Text.
• Check delimiters. Some “CSV” files actually use semicolons; make sure your export uses commas for the cleanest result.
• Use UTF-8. Export your CSV as UTF-8 so accented characters and symbols survive.

Going the other way

Need to hand data to a database or another app? Convert the other direction with Excel to CSV. You can also turn a spreadsheet into a shareable PDF. Browse all our online converters.

FAQ

Is this free?

CSV to Excel is an OhoTool Pro tool. Most of our tools are free; the document converters are part of Pro.

What happens to my file?

It's processed securely on our server only to perform the conversion, then deleted right after.

Will formulas be preserved?

A CSV contains only values, not formulas, so the result holds your data as values in proper columns — ready for you to add formulas in Excel.