Hi,

I have an issue with excel service in SP2013 or SharePoint online. I upload an excel file using excel service , when i try to open it in browser all macros are getting disabled.  So would like to check whether any one has face similar issue? if so whats the work around. Is it native issue with SP2013 excel service ?  I am using simple macro. 

So if any one has come across this type of issue please let me know , would be great if you share the resolution if that issue resolved. 

Hope below will help you:

http://social.technet.microsoft.com/Forums/en-US/4e7a275d-08a7-4385-946a-28a2d8ffdf79/macro-enabled-spreadsheets-and-sharepoint

If you using xlsm then

http://office.microsoft.com/en-in/sharepoint-server-help/differences-between-using-a-workbook-in-the-browser-and-in-excel-HA010369179.aspx

• Excel macro-enabled workbook (.xlsm)
  A workbook in this format can be opened but macros do not run in a browser window.

Some documents say Excel Web App supports more Excel functions than Google Docs does, so complex spreadsheets may transfer over more easily. However, it does not support macros.

http://features.techworld.com/applications/3421784/office-web-apps-vs-google-docs-comparison/