Documentation for Confluence 5.8 (Server).
Documentation for Confluence Cloud and earlier versions of Confluence is available too.

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Confluence gives you the option of limiting the maximum size of a single file attachment. 

To configure the maximum size allowed for an attachment:

  1. Go to  > General Configuration.

  2. Choose Edit.
  3. Enter the maximum size next to Attachment Maximum Size'.
    The default is 100mb. 

  4. Choose Save.