A large percentage of unused space in the table
If you have deleted a lot of data, this isn't recovered until you rebuild.

ALTER INDEX PK_PrimaryKeyName ON dbo.FREECLIENTDOC REBUILD;


Please see all the options in the documentation before just running the default.

Also, IMAGE is deprecated - if you are storing files in your database tables, you should look into VARBINARY(MAX) - on newer versions of SQL Server you can look at FILESTREAM or FILETABLE.