CSV→XLSXConverter
Convert your CSV files to XLSX format instantly. Free, fast, and secure - your files never leave your browser.
↔ Convert XLSX to CSV insteadDrop file or click to browse
Max 100MB • Auto-deletes after 3 min
How to Convert CSV to XLSX
Upload Your File
Drag & drop your CSV file or click to browse. Files up to 100MB are supported.
Convert
Click "Convert to XLSX" and wait a few seconds for processing.
Download
Download your converted XLSX file instantly. No registration needed.
Why Convert CSV to XLSX?
Converting CSV to XLSX improves compatibility, reduces file size, or enables your content to work with specific applications and platforms that require the XLSX format.
About CSV and XLSX
What is CSV?
CSV (Comma-Separated Values) is a plain-text format for tabular data where values are separated by commas. It's the universal interchange format for databases, spreadsheets, and data analysis tools.
What is XLSX?
XLSX is Microsoft Excel's default spreadsheet format based on Open XML. It's the global standard for data analysis, financial modeling, budgets, and business reporting.
Frequently Asked Questions
How do I convert CSV to XLSX?
Upload your CSV file using the converter above, then click "Convert". Your file will be processed and you can download the converted XLSX file immediately. The entire process takes just seconds.
Is it free to convert CSV to XLSX?
Yes, ModConvert is completely free to use. There are no hidden charges, no registration required, and no watermarks on your converted files.
Is my CSV file safe when converting?
Absolutely. Your files are processed securely and are never stored permanently on our servers. Files are automatically cleaned up after conversion to protect your privacy.
What is the maximum file size for CSV to XLSX conversion?
You can convert CSV files up to 100MB in size. This covers most common use cases for spreadsheet files.
Can I convert multiple CSV files at once?
Yes, you can upload and convert multiple CSV files. Each file will be converted to XLSX format individually for the best quality results.