CSV to XLSX Converter
Turn any CSV into a real Excel workbook with this free CSV to XLSX converter. Check the columns, edit cells if you need to, then download a clean .xlsx. Nothing is uploaded.
How to convert CSV to XLSX
Choose your CSV file
Drag a .csv onto the page or click Choose CSV. The file is read in your browser, so it is not uploaded anywhere.
Check the delimiter
The tool detects whether your file uses commas, semicolons, tabs, or pipes. If the columns look wrong, pick the right delimiter from the menu and the grid updates.
Edit the data if you need to
Click any cell to change its text. Right-click a column letter or row number to insert, move, or delete. Skip this step if the data is already clean.
Download the .xlsx
Click Download .xlsx to save a real Excel workbook. It opens in Excel, Google Sheets, and Apple Numbers with your columns intact.
Why convert CSV to XLSX instead of just opening the file?
A CSV is plain text. Every value sits on a line, separated by a comma or a semicolon, and that is the whole format. It is great for moving data between apps, but it carries no column widths, no number formats, no formulas, and no way to tell Excel that 007 is a label and not the number 7. An XLSX file is a real Excel workbook. It keeps types, formatting, and multiple sheets, which is why most people want the data in .xlsx once they actually need to work with it.
The catch is that opening a CSV directly in Excel is where things go wrong. Excel guesses the delimiter, sometimes splits a field that had a comma inside quotes, and happily drops leading zeros from ZIP codes and IDs. This CSV to XLSX converter parses the file the right way first, shows you the columns in a grid, and lets you fix anything before you export. A comma inside a quoted name lands in the correct cell instead of breaking the row.
Everything runs in your browser. When you pick a file, it is read on your own machine and turned into an .xlsx there. Nothing is sent to a server, so a spreadsheet full of customer emails or sales figures never leaves your computer. That also means there is no upload wait for large files.
What this CSV to XLSX converter gives you
100% in your browser
Your file is read and converted on your own device. Nothing is uploaded, so private data stays private.
Automatic delimiter detection
Commas, semicolons, tabs, and pipes are recognized on their own. Override the choice with one click if needed.
Editable grid before export
Fix a typo, rename a header, or add and remove rows and columns before you download, with no second tool required.
A real .xlsx file
The output is a genuine Excel workbook that opens cleanly in Excel, Google Sheets, and Numbers.
Handles quoted fields correctly
Commas and quotation marks inside a value are kept intact, so a name like "Doe, John" never splits across columns.
Free with no signup
No account, no watermark, and no row limit. Convert as many files as you want.
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CSV to XLSX Converter FAQ
How do I convert a CSV to XLSX?
Open the CSV to XLSX converter, choose your .csv file, and it appears in an editable grid within a second. Check that the delimiter is right, fix any cells if you want, then click Download .xlsx. The whole thing happens in your browser, with no upload and no signup.
Is CSV to XLSX conversion free?
Yes. This converter is free with no account, no watermark, and no limit on how many files you convert. Because the work happens in your browser instead of on a paid server, there is no daily cap to hit.
What is the difference between CSV and XLSX?
A CSV is plain text where values are separated by a comma or semicolon, with no formatting or formulas. XLSX is Excel workbook format, which stores data types, column widths, styles, and multiple sheets. Convert CSV to XLSX when you need a proper spreadsheet rather than raw text.
Can I convert CSV to Excel without software?
Yes. You do not need Excel or any install. This tool runs in any modern web browser on Windows, Mac, Linux, or a phone. Pick your CSV, and it builds the .xlsx locally, then hands you the file to save.
Does converting CSV to XLSX change my data?
No. The values in your file stay exactly the same. Converting only wraps that data in the Excel format, so leading zeros, quoted fields, and special characters are preserved. You can review every cell in the grid before you download.
Can Excel open a CSV directly?
Excel can open a CSV, but it often guesses the delimiter wrong, splits quoted values that contain commas, and strips leading zeros from ZIP codes or IDs. Converting to XLSX first, with the columns checked in the grid, avoids those surprises.