With the usual cloud-centric converters, Spreadsheet Conversion Tool is the latest UWP utility from Roxy and, as ever, a vital tool for anyone using Windows 10 laptops and phones for professional use. It's also free, so grab it with both hands. See below for details and screenshots in use.

From the Store description:

Spreadsheet Conversion Tool works with various types of spreadsheet formats. Application allows you easily converts csv, et, numbers, xls, xlsx, ods and other spreadsheet files to png, pdf, html, jpg and other formats. Friendly, clear and convenient design makes working with application easy and understandable.

Full list of formats available for conversion: 

From Spreadsheet file to file

• csv -> html, pdf, jpg, png, ods, xls, xlsx 
• et -> csv, html, ods, pdf, xls, xlsx 
• numbers -> html, pdf, jpg, png, csv, xls, xlsx
• ods -> html, pdf, jpg, png, csv, xls, xlsx
• sdc -> html, pdf, jpg, png, csv, ods, xls, xlsx 
• xls -> html, pdf, jpg, png, xps, csv, ods, xlsx
• xlsm -> html, pdf, jpg, png, xps, ods, xls, xlsx
• xlsx -> html, pdf, jpg, png, xps, csv, ods, xls

From file to Spreadsheet file

• csv <- et, numbers, ods, sdc, xls, xlsx
• ods <- csv, et, sdc, xls, xlsx, xlsm
• xls <- csv, et, numbers, ods, sdc, xlsx, xlsm
• xlsx <- csv, et, numbers, ods, sdc, xls, xlsm

The UI is somewhat trivial, but here we go anyway:

There's quite a bit in the file compatibility list that interests me - for example, being able to render anything numeric out to image formats, for sharing to people who might not otherwise be able to see the original document. 

Another great tool. You cab grab this for free in the Store here.