Microsoft Excel Spreadsheet (Legacy)
XLS is the legacy binary format used by Microsoft Excel before 2007. While superseded by XLSX, many existing spreadsheets and enterprise systems still use this format.
MIME type
application/vnd.ms-excel
Developer
Microsoft
Introduced
1987
XLS uses the BIFF (Binary Interchange File Format) within OLE2 compound documents. Limited to 65,536 rows by 256 columns per sheet.
12 conversion options available
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Office Open XML Document
Microsoft Word Document (Legacy)
Plain Text File
Office Open XML Spreadsheet
Comma-Separated Values
Office Open XML Presentation
Microsoft PowerPoint Presentation (Legacy)
Open Document Text
Rich Text Format
HyperText Markup Language
Electronic Publication