XLS converter


or Drop them here
Up to 50 files

XLSX, CSV, ODS

XLS - Microsoft Excel Binary File Format

Format introduction

Microsoft Excel up until 2007 version used a proprietary binary file format called Excel Binary File Format (.XLS) as its primary format. Excel 2007 uses Office Open XML as its primary file format, an XML-based format that followed after a previous XML-based format called "XML Spreadsheet".

Technical details

OpenOffice.org has created documentation of the Excel format. Since then Microsoft made the Excel binary format specification available to freely download.

Scroll to Top