Thank you for using GroupDocs.Conversion API.
There is an option available to "ShowGridLines " for CellsSaveOptions where you can enable cells border in spreadsheet.
// Save options
SaveOptions saveOptions = new CellsSaveOptions
OutputType = OutputType.String,
ShowGridLines = true // display border for each all cells
However i have successfully re-produced this issue for cells background color at our end. I am creating ticket for this issue on our issue tracking system. Once we get any update from product team we will notify you here.
Thank you for your patience.
The issues you have found earlier (filed as CONVERSIONNET-1207 ) have been fixed in this update.
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Thank you for Exploring GroupDocs.Conversion API.
I have tested your mentioned scenario and found conversion is generating output which is attached with this thread. Converted file in excel format is missing background color which is already discussed and logged on our issue tracking system.
You are probably using unlicensed version API that is why you are facing this issue. kindly get free temporary license from here to evaluate further GroupDocs.Conversion API .
If you will need any help or you
will have any other questions please feel free to ask.