SpeedGrader, the inline grading tool in Canvas, and Canvas DocViewer, the inline annotation and markup tool in Canvas, can support the following documents:

• doc -- Microsoft Word Document (old format)
• docx -- Microsoft Word Document
• key -- Software License Keys
• numbers -- Apple Numbers File
• odf -- OpenDocument Format
• odg -- OpenDocument Drawing Document
• odp -- OpenDocument Presentation
• ods -- OpenDocument Spreadsheet
• odt -- OpenDocument Text
• pages -- Apple Text Document
• pdf -- Portable Document Format
• ppt -- PowerPoint Presentation (old format)
• pptx -- PowerPoint Presentation
• rtf -- Rich Text Format
• sxc -- OpenOffice Calc Spreadsheet File
• sxi -- StarOffice Impress File
• sxw -- StarOffice Writer Document File
• txt -- Standard Text Document
• xlsx -- Microsoft Excel Spreadsheet
• xls -- Microsoft Excel Spreadsheet (old format)

Further resources:

• What types of files can be previewed in Canvas?
• How do I create an online assignment?