Free Online XLSX Converter
The modern Excel workbook, heavier than the data inside it.
Up to 50 MB per file. Sign up free to convert files up to 100 MB.
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Checking files and selected output formats.
How to convert XLSX files online
Convert Excel XLSX spreadsheets to CSV, PDF, or other data formats while preserving formulas, formatting, and multiple sheets.
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Upload your XLSX spreadsheet
Drag and drop XLSX files from Microsoft Excel, Google Sheets exports, or Numbers conversions. Cell formatting, formulas, charts, pivot tables, and multiple worksheets are all read by the converter.
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Choose your output format
Select CSV for universal data interchange and database imports, PDF for a print-ready fixed layout, XLS for legacy Excel compatibility, or ODS for LibreOffice Calc. Multi-sheet workbooks are handled automatically.
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Download your converted data
Download your converted spreadsheet with data integrity preserved. XLSX to CSV extracts clean tabular data. XLSX to PDF creates a formatted printable version. Files are securely deleted within 1 hour.
Reasons to convert XLSX Spreadsheets
Convert XLSX to CSV for importing data into databases, analytics platforms, CRM systems, and any application that reads tabular data. CSV is the universal data interchange format.
Convert XLSX to PDF for clean, paginated spreadsheet printouts. PDF preserves column widths, cell formatting, and print areas exactly as configured in Excel.
Some older systems and embedded applications only accept XLS format. Convert XLSX to XLS for compatibility with Excel 97-2003 and legacy enterprise software.
Convert XLSX to ODS for editing in LibreOffice Calc without a Microsoft Office license. ODS preserves formulas, formatting, charts, and multiple worksheets.
Not everyone has Microsoft Excel or knows how to use it. Convert XLSX to PDF for sharing financial reports, data summaries, and tables with non-technical recipients.
Convert XLSX to CSV or TSV for use with Python, R, SQL, and data processing pipelines. Plain text formats eliminate binary parsing complexity.
Convert XLSX documents online, no desktop apps, no plugins. No watermarks added, formatting preserved, and files are deleted from our servers within 1 hour.
About the XLSX Format
XLSX (Excel Open XML Spreadsheet) is the default file format for Microsoft Excel 2007 and later. Built on the Office Open XML standard (ECMA-376ISO/IEC 29500), it uses ZIP-compressed XML files to store spreadsheet data, formulas, formatting, charts, and pivot tables. XLSX replaced the legacy XLS binary format with a more efficient, recoverable, and interoperable architecture.
XLSX supports over one million rows and 16,000 columns per worksheet, 500+ built-in functions, conditional formatting, data validation, and advanced chart types. The format is natively supported by Microsoft Excel, Google Sheets, Apple Numbers, LibreOffice Calc, and most modern spreadsheet applications. XLSX is the global standard for financial modeling, data analysis, reporting, and business intelligence workflows.