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I'm need to block a specific file format in a library of SharePoint online site (o365). I have activated RMS feature in admin & in Admin-> sharepoint-> settings too.

What's the next step or procedure?

Or is there a feature or method where I can allow the users to add only documents or Pdf file format ?

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  • Do you want people to stop saving a certain format, or open files (in that format) that happen to be there already.
    – Jeroen Ritmeijer
    Commented Aug 30, 2016 at 9:59
  • They are not allowed to upload other formats, except documents or pdf (depending upon the situation). For eg: in one library only pdf and in another library only documents.
    – rakesh s
    Commented Aug 31, 2016 at 10:05

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There is no OOTB facility with SharePoint Online to restrict specific file extensions in SharePoint Online. The only ways are:

  • Create an event handler which will check the file extension.
  • Create a workflow for the same.
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I had a look around and can't see any indication that this is editable - seems like another thing MS hide from us.

From looking at the IRM options on a library it doesn't seem like blocking certain file types is an option, just that you can block any non-IRM compatible files being uploaded.

My suggestion would be a workflow that auto-runs on each item and if it doesn't match the given type, auto-deletes the document. Little bit clunky but it would do the job, just keep an eye on resource usage if you're dealing with a ton of documents.

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