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XLSX Converter - Transform Excel Spreadsheets

Convert Excel XLSX spreadsheets to PDF, CSV, and other formats.

Step 1: Upload your files

You can also Drag and drop files.

Step 2: Choose format
Step 3: Convert files

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What is XLSX?

XLSX is Microsoft Excel's modern spreadsheet format, introduced with Office 2007. It replaced the older XLS format and remains the standard for Excel documents today.

XLSX files use the Office Open XML standard (ISO 29500), storing data as compressed XML. This makes files smaller than XLS, more secure (no macros by default), and more compatible with other software.

XLSX supports over a million rows, 16,000+ columns, and includes full spreadsheet functionality: formulas, charts, pivot tables, conditional formatting, and multiple worksheets.

Why Convert XLSX Files?

XLSX conversion addresses many practical needs:

  • Universal sharing - Convert to PDF so anyone can view your data without Excel
  • Data portability - CSV format works with any database, application, or programming language
  • Legacy compatibility - XLS format for users with older Excel versions (2003 and earlier)
  • Web publishing - HTML format for displaying data on websites
  • System integration - XML format for web services and APIs
  • Creating Excel files - Convert CSV, PDF, or other formats TO XLSX for Excel work

Convert XLSX to Other Formats

Transform your Excel spreadsheets for different purposes:

XLSX to PDF

Create professional PDF documents from your spreadsheets. Perfect for sharing data as reports, invoices, or documents that recipients shouldn't edit. Preserves layout and formatting exactly.

XLSX to CSV

Export spreadsheet data as comma-separated values. Essential for database import, data processing, or sharing with applications that don't support Excel formats.

XLSX to XLS

Downgrade to legacy Excel format for users with Office 2003 or earlier. Preserves data and most formatting within XLS limitations.

XLSX to TXT

Extract plain text data from your spreadsheets. Useful for text processing or when you need just the data values.

XLSX to XML

Transform spreadsheet data to structured XML for web services, APIs, or applications requiring XML format.

XLSX to HTML

Convert spreadsheets to HTML tables for displaying data on websites. Creates web-ready tables from your Excel data.

Convert Other Formats to XLSX

Import data into Excel format for analysis:

CSV to XLSX

Upgrade CSV data files to full Excel format. Enables formulas, formatting, charts, and all Excel features for your data.

XLS to XLSX

Modernize legacy Excel files to the current format. Reduces file size and enables modern Excel features.

PDF to XLSX

Extract tables from PDF documents into editable Excel spreadsheets. Our converter identifies tabular data and reconstructs it for Excel editing.

XML to XLSX

Import structured XML data into Excel for analysis, filtering, and visualization in a spreadsheet environment.

TXT to XLSX

Convert text data to Excel format. Useful for importing delimited text files into spreadsheets.

DBF to XLSX

Convert legacy dBASE database files to modern Excel format. Essential for accessing old database data.

XLSX Technical Specifications

  • Full name: Office Open XML Spreadsheet
  • Developer: Microsoft Corporation
  • First released: 2007 (with Office 2007)
  • File extension: .xlsx
  • MIME type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
  • Structure: ZIP archive containing XML files
  • Standards: ECMA-376, ISO/IEC 29500
  • Maximum rows: 1,048,576
  • Maximum columns: 16,384

XLSX Compatibility

Software That Opens XLSX Files

  • Microsoft Excel 2007 and later (Windows, Mac)
  • Microsoft 365 (cloud and desktop)
  • Google Sheets (free, web-based)
  • LibreOffice Calc (free, cross-platform)
  • Apple Numbers (Mac, iOS)
  • WPS Office Spreadsheets
  • Most modern spreadsheet applications

XLSX Advantages

  • Smaller file sizes than XLS
  • Cannot contain macros by default (XLSM for macros)
  • Open standard, widely supported
  • Much larger capacity than XLS
  • Better recovery from corruption

How to Convert XLSX Files

  1. Upload your XLSX file - Drag and drop your Excel file or click to browse. We handle large spreadsheets with multiple sheets.
  2. Choose your output format - Select PDF for sharing, CSV for data export, XLS for legacy compatibility, or other formats.
  3. Download your converted file - Conversion preserves your data. Download immediately with formatting intact.

Pro Tip

XLSX files are ZIP archives. Rename .xlsx to .zip to access the XML files inside. This is useful for recovering data from corrupted files or extracting embedded images.

Common Mistake

Sending XLSX files assuming everyone has Excel. Many recipients can't open Excel files. Convert to PDF for viewing, or CSV when they only need the data.

Best For

XLSX is ideal for data analysis, financial modeling, reports with formulas, and any work requiring spreadsheet calculations. It's the standard for business spreadsheets.

Not Recommended

Avoid XLSX for simple data that needs maximum portability. Use CSV for data that will be imported into databases or processed by code. Use PDF when recipients shouldn't edit.

Frequently Asked Questions

XLSX is Microsoft Excel's modern spreadsheet format, used since Excel 2007. It stores data, formulas, charts, and formatting in a compressed XML format. XLSX files are smaller and more secure than the older XLS format.

Upload your XLSX file to ChangeMyFile and select PDF as the output format. The conversion creates a PDF document that preserves your spreadsheet layout, perfect for sharing or printing.

Yes, upload your XLSX file and select CSV as output. This extracts the data from the first sheet as comma-separated values, which works with any database or application.

XLSX is the modern format (2007+) using XML compression, while XLS is the older binary format (1997-2003). XLSX files are smaller, support more data, and are more secure. Use XLSX for new files.

Yes, Google Sheets fully supports XLSX files. Upload to Google Drive and open with Sheets, or import directly. Most formatting and formulas transfer correctly.

Upload your PDF to ChangeMyFile and select XLSX as output. Our converter extracts tables from the PDF and creates an editable Excel spreadsheet with the data.

Converting to PDF preserves the calculated values but not editable formulas. Converting to XLS preserves formulas within its feature limits. Converting to CSV exports only values, not formulas.

Yes, ChangeMyFile supports batch conversion. Upload multiple XLSX files and convert them all to your chosen format simultaneously.

XLSX files are already compressed. To reduce size further, remove unused rows/columns, compress images, or remove unnecessary formatting. Converting to CSV produces the smallest files but loses formatting.

XLSX is Excel's default file format, but Excel can open many formats. When people say 'Excel file' they usually mean XLSX. Excel is the application; XLSX is the file format.

XLSX Conversions & Related Converters

Quick access to the most commonly used file conversions.