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HMRC internal manual

Shared Workspace Business Manual

HM Revenue & Customs
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Other Considerations: File Sizes

The maximum size of any file that can be added to a Room is 9 Mega Bytes (Mb).

Any attempt to upload a file of over 9Mb to a Room will be automatically prevented by the service.

This site restriction cannot be changed by the Shared Workspace Team.


  1. A file that is over 9Mb in its original form but is compressed or zipped to a size below 9Mb can be added to Shared Workspace.
  2. A file stored in Shared Workspace can exceed 9Mb if data is added to it after it has been uploaded.

Alternative options for uploading a file that is too large is to print it to PDF, split it into multiple smaller documents, or zip it into 9Mb chunks that can be uploaded as a connected set. Further information on connected sets can be found in the product help in the folder section. The product help can be accessed from the Room.