CSV To Excel

What this tool does

This tool turns a CSV file into a proper Excel spreadsheet. Upload your CSV and it builds a real .xlsx workbook, with your data laid out in rows and columns on a sheet, ready to open in Excel or Google Sheets. The whole thing happens in your browser, so your file is never uploaded.

How to use it

1. Select your CSV file.
2. Press Convert, and the tool reads your data and assembles an Excel workbook.
3. Download the .xlsx file. Reset clears the tool for another conversion.

How it works

The tool reads the text of your CSV, splits it into rows and columns at the commas, and writes that grid into a genuine Excel workbook using the SheetJS library, placing everything on a sheet named Sheet1. The output is a real spreadsheet file in the modern .xlsx format, not a CSV with a different name. Because it all runs on your device, nothing is sent to a server.

A worked example

Say your CSV looks like this:

name,age,city
Alice,30,London
Bob,25,Paris

After converting, you get an Excel sheet with the values in their own cells, the first row as your column headers and each line below it as a row:

From there it behaves like any spreadsheet: you can sort it, filter it, add a formula, or format the cells.

CSV and Excel, and why convert

It helps to know what actually separates these two, because they can look identical when opened. A CSV is the simplest possible table: plain text, with commas between values and a line break between rows, and nothing else. It carries no formatting, no formulas, no sense of which values are numbers or dates, and no concept of more than one sheet. That simplicity is its strength for moving data between systems, but it is also its limit.

An Excel file is a true spreadsheet. It holds formatting, formulas, number and date types, multiple sheets, and everything else you expect to work with. Converting to it gives you a file you can actually build in rather than just read. There is also a practical reason to convert rather than just opening the CSV in Excel directly: opening a raw CSV can quietly mangle things, dropping the leading zero from a code like 00123, reading a date in the wrong order, or garbling accented characters if the encoding is misread. Running it through this tool, which reads the file as UTF-8, sidesteps a lot of that. Going the other way, the Excel to CSV tool converts back, and the CSV Viewer lets you preview a CSV before converting.

Questions people ask