Convert CSV to XLSX Online

4.9 (704)

The fastest way to **convert CSV to XLSX** online. Turn raw comma-separated values into professional Excel spreadsheets. Secure, free, and instant.

Secure & PrivateFast ProcessingFree to Use

Easy CSV to Excel Conversion

Raw data in CSV (Comma Separated Values) format is excellent for machine processing and data exchange, but it can be difficult for humans to read and analyze. Our CSV to XLSX converter bridges this gap by transforming your plain text data into a structured, easy-to-read Excel spreadsheet. Whether you are preparing a financial report for your boss, sharing data with a non-technical team member, or simply want to leverage Excel's powerful features like filtering, sorting, and charting, our converter makes the process seamless. Unlike older formats like XLS, the modern XLSX format is XML-based, more efficient, and widely supported.

How It Works

Upload CSV Data

Select your CSV file from your computer or copy and paste the raw text directly into the tool. We support standard comma delimiters as well as other common formats.

Automatic Processing

Our intelligent engine parses the CSV structure, identifying headers, rows, and columns. It then maps this data into a valid Excel workbook structure in memory.

Download Excel File

Once processed, simply click the download button to save the generated .xlsx file to your computer. You can then open it immediately in Microsoft Excel, Google Sheets, or LibreOffice.

Why Use Our Tool?

User-Friendly Interface

We designed our tool to be intuitive. There are no complex settings or configurations to worry about—just upload your file and get your results.

No Software Dependencies

You don't need to have Microsoft Excel installed to generate these files. This is perfect for users on Chromebooks, Linux machines, or mobile devices.

Privacy Guaranteed

In an era of data breaches, we prioritize your security. Since we don't upload your files to the cloud, your confidential business data, customer lists, and financial records remain safe on your device.

Universal Compatibility

The XLSX files generated by our tool are fully compatible with all modern spreadsheet software, including Microsoft Excel 2007 and later, Google Sheets, Apple Numbers, and OpenOffice.

High Performance

Built with modern web technologies, our converter is optimized for speed. It can handle files with thousands of rows in seconds, saving you valuable time.

Common Applications

Business Reporting

Turn raw server logs, sales data, or database exports into professional-looking reports that are ready for presentation to management or stakeholders.

Data Analysis

Bring raw data into the Excel environment to utilize powerful analytical tools like pivot tables, conditional formatting, and complex formulas.

Client Deliverables

When delivering data to clients, a formatted Excel spreadsheet looks much more professional and is easier for them to use than a raw text file.

FAQ: How to Convert CSV to XLSX

How do I convert CSV to XLSX?

1. Upload your **.csv** file or paste the CSV text directly into the input area. 2. The tool automatically processes the data, mapping columns and rows. 3. Click 'Download XLSX' to get your formatted Excel file instantly.

Is this tool free?

Yes, our **CSV to XLSX converter** is 100% free to use. There are no hidden costs, subscriptions, or limits on the number of files you can convert.

Do I need Excel installed?

No. You can create Excel files from CSV directly in your browser without having Microsoft Office or Excel installed on your computer. The file generated is compatible with all modern spreadsheet viewers.

Can I convert large CSVs?

Yes, our tool handles large datasets efficiently. Because it runs locally in your browser, it can process thousands of rows quickly without the latency of uploading to a server.

Is it safe?

Absolutely. All conversion happens locally on your machine using JavaScript. Your sensitive data is never shared, uploaded, or stored on our servers, ensuring complete privacy.