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HomeConvertConvert to XLSX

Convert to XLSX

Convert any file to Microsoft Excel format — free, fast, and private

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o arrastra y suelta archivos aquí

Tamaño máximo: 2GB

Tus archivos se procesan localmente en tu navegador. Nada se sube a ningún servidor.

About XLSX Format

Microsoft Excel (.xlsx)

XLSX is the modern Microsoft Excel spreadsheet format, introduced with Office 2007 as part of the Office Open XML (OOXML) standard. Like DOCX, an XLSX file is a ZIP archive containing XML files. XLSX supports up to 1,048,576 rows and 16,384 columns per sheet, formulas (including array formulas and LAMBDA functions), charts, pivot tables, conditional formatting, data validation, sparklines, named ranges, and VBA macros (as .xlsm). The format supports multiple worksheets, cell styles and themes, embedded images, and extensive number formatting. XLSX is the standard format for business data analysis, financial modeling, reporting, and data management. It's natively supported by Microsoft Excel, Google Sheets, LibreOffice Calc, and Apple Numbers.

Convert to XLSX from any format

Choose a source format below to convert to Microsoft Excel

XLSXLSXODSXLSXCSVXLSXTSVXLSXNUMBERSXLSXXLSMXLSXXLSBXLSX

Frequently Asked Questions

How do I convert files to XLSX?
Simply upload your file using the converter above, select XLSX as the output format, and click convert. The conversion happens instantly in your browser — no uploads needed.
What file formats can be converted to XLSX?
You can convert 7+ formats to XLSX, including XLS, ODS, CSV, TSV, NUMBERS and more. Browse the full list of supported source formats above.
Is converting to XLSX free?
Yes, Convert999 is 100% free with no limits. Convert as many files to XLSX as you need — no registration, no watermarks, no hidden fees.
Is my data safe when converting to XLSX?
Absolutely. All conversions happen locally in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

Explore XLSX

XLSX Converter

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XLSX Format

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