Convert CSV files to Excel online

Turn a comma-, semicolon-, tab-, or pipe-delimited CSV into a downloadable Excel workbook (.xlsx) without installing desktop software. Preview the first rows, set the worksheet name, and choose whether values should stay as text.

Your CSV file is processed locally in your browser and is not uploaded to our servers.

How to convert CSV to Excel

1. Choose or drag a .csv file into the tool.
2. Review the detected delimiter, row and column counts, and table preview.
3. Set the worksheet name, header-row preference, column auto-sizing, and whether to preserve values as text.
4. Select Convert to Excel to create and download the .xlsx file.

Browser-based CSV conversion

• One CSV file at a time.
• Auto-detect or manually choose comma, semicolon, tab, or pipe delimiters.
• Optional preserve-as-text mode for leading zeros.
• Auto-sized columns with a safe maximum width.
• Download a real Office Open XML (.xlsx) workbook.

Private CSV-to-Excel processing

Your CSV file is processed locally in your browser and is not uploaded to our servers. Parsing and workbook generation use SheetJS in the browser. There is no Looty Tools conversion endpoint that receives your CSV contents for this workflow.

Limits and important notes

• Maximum file size is 25.0 MB.
• Only one .csv file can be converted at a time.
• Empty files and files with no usable rows are rejected.
• “First row contains headers” affects preview labeling and column-width weighting only; exported header cells are not styled bold.
• With Preserve values as text off, SheetJS may convert some date-like or numeric-looking strings.
• Large CSV files may use significant browser memory.

Related tools

• Excel to PDFConvert Excel spreadsheets to PDF files.
• Split CSVSplit a CSV file into multiple smaller CSV files.
• Excel to CSVConvert Excel spreadsheets to CSV files.
• CSV to JSONConvert CSV data to JSON format.

CSV to Excel FAQ

How do I convert CSV to Excel?

Open CSV to Excel, choose or drop a .csv file, review the preview and options, then select Convert to Excel to download an .xlsx workbook.

Is my CSV file uploaded?

No. Your CSV file is processed locally in your browser and is not uploaded to our servers.

What is the difference between CSV and Excel?

CSV is a plain-text table format. Excel (.xlsx) is a spreadsheet workbook that can hold typed values, column widths, and worksheet names in an Office Open XML file.

Will leading zeros be preserved?

Enable Preserve values as text to keep values such as 00123 unchanged. When that option is off, SheetJS may convert some values to numbers.

Can the converter detect semicolon or tab delimiters?

Yes. Auto-detect inspects the first nonblank records and can choose comma, semicolon, tab, or pipe. You can also set the delimiter manually.

What is the maximum CSV file size?

Each CSV file must be 25 MB or smaller.

Does the tool work on Mac, Windows, iPhone, and Android?

Yes on modern browsers with JavaScript enabled. Large files may use significant memory on phones.

Can Excel open the downloaded file?

Yes. The tool generates a real .xlsx workbook that Excel, Google Sheets, and similar apps can open.