XLS to XLSX Converter

XLS to XLSX Converter

Description

Convert XLS files into XLSX format while preserving formatting.

Use Cases
  • Convert XLS documents into XLSX for compatibility.
  • Preserve original formatting and layout.
Format Comparison
FeatureXLSXLSX
CompressionN/AN/A
LayoutPreservedPreserved
CompatibilityLegacyModern
Example Workflow
  1. Upload your XLS file.
  2. Click “Convert to XLSX.”
  3. Download the resulting XLSX file.

Complete Guide to XLS to XLSX Conversion

What is XLS to XLSX Conversion?

Transforms legacy Excel (XLS) files into modern Excel (XLSX) format, upgrading binary spreadsheet files to the OpenXML format with enhanced features, better compression, and Office 365 compatibility.

Why Choose XLSX?

  • Modern OpenXML format with superior compression
  • Advanced Excel features and functions
  • Full Office 365 and Excel Online compatibility
  • Support for large datasets and complex formulas
  • Enhanced charts, pivot tables, and data analysis tools

Technical Specifications

AspectXLS FormatXLSX Format
File TypeBinary spreadsheetOpenXML spreadsheet
CompatibilityExcel 97-2003Excel 2007+
File SizeLarger binary formatCompressed XML format
Cloud SupportLimitedOffice 365, Excel Online

Best Practices

Before Conversion
  • Test formulas and calculations
  • Check for Excel-specific features
  • Verify data integrity
  • Document any custom macros
  • Create backup of original XLS file
After Conversion
  • Verify formulas work in modern Excel
  • Test advanced Excel features
  • Apply modern Excel styles and themes
  • Optimize for cloud collaboration
  • Test with Excel Online and mobile apps
Conversion Stats
  • Success Rate: 98%
  • Avg Processing: 1–3 seconds
  • Max File Size: 25MB
  • Formula Compatibility: Excellent
XLSX Format Benefits
  • ✓ Modern Excel compatibility
  • ✓ Advanced data analysis
  • ✓ Cloud collaboration
  • ✓ Better compression
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