Will numbers and dates be recognized correctly in Excel?

Numeric values are written as numbers, not text, so Excel will treat them correctly for formulas and sorting. Dates in ISO format (YYYY-MM-DD) are written as text — you may need to format the column as Date in Excel after opening.

Can I convert a CSV with special characters or accents?

Yes. The converter handles UTF-8 encoded CSV files, which covers all standard Latin characters, accented letters, and most international characters. If your CSV was saved in a legacy encoding like Windows-1252, you may need to re-save it as UTF-8 first.

What delimiter does the CSV need to use?

Standard comma (,) delimiter. If your file uses a semicolon or tab as delimiter — common in European locale exports — open it in a text editor, find-and-replace the delimiter with a comma, then convert.

Is there a row or column limit?

The tool has no built-in limit. Excel itself supports up to 1,048,576 rows and 16,384 columns per sheet. CSVs within those bounds will convert fully.

Can I convert multiple CSV files at once?

Yes — drop multiple .csv files at once and each gets its own .xlsx workbook. Each CSV becomes a single-sheet Excel file.

Can I merge multiple CSVs into one Excel workbook with multiple sheets?

Not currently — each CSV produces its own workbook. For multi-sheet workbooks, convert each CSV separately and manually copy the sheets into a single workbook in Excel.

Is my CSV data uploaded anywhere?

No. Everything runs in your browser using JavaScript. Your data never leaves your device — not even temporarily. There is no server storing or logging your files.

Is it safe to convert CSVs with sensitive business data?

Yes. Because the conversion happens entirely in your browser with zero server communication, it is safe to use with financial data, HR records, customer lists, or any sensitive information.

CSV to Excel, free forever.

Convert CSV to .xlsx spreadsheets in your browser. Nothing is uploaded. Ever.

Convert to Excel free →

No sign-up · No upload · Works in your browser

Drop CSV files here

or browse files·.csv files

Files stay on your device — nothing is uploaded

When to use CSV vs Excel

CSV is the universal export format — nearly every database, analytics tool, and SaaS product can export data as CSV. Excel (.xlsx) is the universalworking format — it supports formatting, multiple sheets, formulas, charts, pivot tables, and filters that CSV can't represent.

Convert CSV to Excel when you need to share data with non-technical colleagues who expect a spreadsheet, when you want to apply formulas and conditional formatting before distributing the file, or when you need to import into a tool that specifically requires .xlsx rather than .csv.

→Share a database export with a business stakeholder who works in Excel
→Import product data into an e-commerce platform that requires .xlsx
→Apply formula calculations to a raw data export from an analytics tool
→Create a formatted report from a CRM or accounting CSV export
→Hand off financial data to an accountant who uses Excel
→Import into tools like Shopify, WooCommerce, or QuickBooks that accept .xlsx

How to convert CSV to Excel

1
Drop your CSV files
Drag one or more .csv files onto the converter, or click to browse. Multiple files can be converted at once.
2
Wait for conversion
Each CSV is parsed and converted to an .xlsx Excel workbook in your browser using the SheetJS library.
3
Download the .xlsx file
Click Download next to each file to save the Excel workbook. It opens in Excel, Google Sheets, LibreOffice, and Numbers.

How the conversion works

This tool uses SheetJS (xlsx), the industry-standard JavaScript library for reading and writing spreadsheet files. It parses your CSV in the browser, maps each row and cell to the Office Open XML format that .xlsx uses, and produces a valid workbook file.

The process is entirely client-side — SheetJS runs as JavaScript on your device. No file is transmitted. The download is generated locally using a Blob URL, the same mechanism your browser uses for any local file save.

Related tools

CSV to JSON — convert CSV to JSON for use in code or APIs
JSON to CSV — convert a JSON array to CSV, then convert that to Excel

Frequently asked questions

Compatibility

Yes. The output is a standard .xlsx file (Office Open XML format), compatible with Excel 2007 and later, Google Sheets, LibreOffice Calc, and Apple Numbers.

No. CSV files are plain text and contain no formatting or formulas. The converted Excel file will contain raw values only. You can add formatting after opening it in Excel.

Output

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