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HomeConvertXLSX Converter

XLSX Converter

Convert Microsoft Excel files to any format — free, fast, and 100% private

电子表格7+ Output Formats
选择文件

或将文件拖放到此处

最大文件大小:2GB

您的文件在浏览器中本地处理,不会上传到任何服务器。

Instant Conversion

Convert XLSX files in seconds using WebAssembly

100% Private

Files never leave your device — zero server uploads

Free Forever

No limits, no registration, no watermarks

What is XLSX?

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 XLSX to Any Format

Select an output format below to convert your Microsoft Excel file

XLSXXLSXLSXODSXLSXCSVXLSXTSVXLSXNUMBERSXLSXXLSMXLSXXLSB

How to Convert XLSX Files

1

Open Convert999 and upload your XLSX file by clicking "Choose Files" or dragging it into the converter.

2

Select the desired output format (e.g., PDF, JPG, PNG, DOCX, MP3, or any of 7+ supported formats).

3

Click "Convert Now" and download your converted file instantly. No waiting, no server processing.

XLSX Converter FAQ

How do I convert XLSX files?
Upload your XLSX file to Convert999, select the desired output format, and click convert. The conversion happens instantly in your browser — no file uploads to any server.
What formats can I convert XLSX to?
You can convert XLSX to 7+ formats including XLS, ODS, CSV, TSV, NUMBERS and more.
Is the XLSX converter free?
Yes! Convert999 is 100% free — no registration, no watermarks, no file limits. Convert unlimited XLSX files at no cost.
Can I convert XLSX files on my phone?
Yes, Convert999 works on any device with a web browser — iPhone, Android, tablet, or desktop. No app installation needed.
Is it safe to convert XLSX files online?
Convert999 processes all files locally in your browser using WebAssembly technology. Your files never leave your device, ensuring complete privacy.
What is the maximum XLSX file size I can convert?
Convert999 supports files up to 2GB. Since processing happens locally, performance depends on your device's available memory.

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XLSX Format Details

Full specification & info

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