CSV to XLSX Converter

This CSV to XLSX converter builds an Excel workbook out of a plain text table: values land in cells, the file opens on a double click and is ready for sorting and formulas.

What happens when you convert CSV to XLSX

CSV is plain text: rows of values with a separator between them. It carries no data types, no column widths and no sheets, so every program reads such a file its own way. Hence the familiar picture: your colleague opened the table and got a single column.

XLSX stores a table that has already been parsed. After the conversion the data sits in cells, and the file opens the same way in Excel, LibreOffice and Google Sheets.

• The comma is treated as the separator. A value containing a comma survives if it is quoted: "USB-C cable, 1 m".
• An export that uses semicolons lands in a single column, so re-save such a file with commas first.
• Text carries over as it was, non-Latin alphabets included.
• Numbers become numbers, so a code with leading zeros (00123) turns into 123.
• No formulas appear in the result: the CSV had none, only values move across. Styling and column widths are yours to set.
• One CSV makes one sheet; extra tabs are added later in your editor.

How to convert CSV to XLSX

1. Check the separator in the file: it has to be a comma.
2. Drag the CSV file into the form above or pick it from your disk.
3. Make sure the target format is XLSX and start the conversion.
4. Download the finished workbook from the link on this page.

Who needs CSV to XLSX

• Take an export from your CRM or a bank statement and do the maths in Excel.
• Send a report to a colleague whose CSV opens as one column.
• Match a supplier price list against stock: sorting and filters work in a workbook.
• Upload the table to a service that accepts XLSX only.
• Archive an export so that a year from now it opens exactly as it does today.

Related conversions

• You need the table back in plain text: XLSX to CSV converter.
• The table goes to print or to approval: CSV to PDF converter.

FAQ

What if my file uses semicolons?

The rows will land in a single column. Excel saves CSV that way in several locales, so re-save the file with commas — "Save as" → "CSV (comma delimited)" — or replace the character in a text editor.

Are leading zeros in product codes kept?

No: 00123 arrives as the number 123. If the zeros matter, format that column as text in the finished workbook and re-enter the codes, or store them with a prefix.

Will formulas and formatting appear?

No. A CSV holds values only, so values are what moves into the XLSX. Formulas, colours and column widths are yours to add in Excel.