diff --git a/modules/webapp/src/main/elm/Api.elm b/modules/webapp/src/main/elm/Api.elm
index 53a9982a..6ce34ec1 100644
--- a/modules/webapp/src/main/elm/Api.elm
+++ b/modules/webapp/src/main/elm/Api.elm
@@ -75,6 +75,7 @@ module Api exposing
     , refreshSession
     , register
     , removeMember
+    , removeTagsMultiple
     , sendMail
     , setAttachmentName
     , setCollectiveSettings
@@ -1342,6 +1343,20 @@ addTagsMultiple flags data receive =
         }
 
 
+removeTagsMultiple :
+    Flags
+    -> ItemsAndRefs
+    -> (Result Http.Error BasicResult -> msg)
+    -> Cmd msg
+removeTagsMultiple flags data receive =
+    Http2.authPost
+        { url = flags.config.baseUrl ++ "/api/v1/sec/items/tagsremove"
+        , account = getAccount flags
+        , body = Http.jsonBody (Api.Model.ItemsAndRefs.encode data)
+        , expect = Http.expectJson receive Api.Model.BasicResult.decoder
+        }
+
+
 setNameMultiple :
     Flags
     -> ItemsAndName
diff --git a/modules/webapp/src/main/elm/Comp/ItemDetail/EditMenu.elm b/modules/webapp/src/main/elm/Comp/ItemDetail/EditMenu.elm
index dd707a0e..161b5871 100644
--- a/modules/webapp/src/main/elm/Comp/ItemDetail/EditMenu.elm
+++ b/modules/webapp/src/main/elm/Comp/ItemDetail/EditMenu.elm
@@ -53,6 +53,12 @@ type SaveNameState
     | SaveFailed
 
 
+type TagEditMode
+    = AddTags
+    | RemoveTags
+    | ReplaceTags
+
+
 type alias Model =
     { tagModel : Comp.Dropdown.Model Tag
     , nameModel : String
@@ -70,6 +76,7 @@ type alias Model =
     , concPersonModel : Comp.Dropdown.Model IdName
     , concEquipModel : Comp.Dropdown.Model IdName
     , modalEdit : Maybe Comp.DetailEdit.Model
+    , tagEditMode : TagEditMode
     }
 
 
@@ -82,6 +89,7 @@ type Msg
     | RemoveDueDate
     | RemoveDate
     | ConfirmMsg Bool
+    | ToggleTagEditMode
     | FolderDropdownMsg (Comp.Dropdown.Msg IdName)
     | TagDropdownMsg (Comp.Dropdown.Msg Tag)
     | DirDropdownMsg (Comp.Dropdown.Msg Direction)
@@ -146,6 +154,7 @@ init =
     , dueDate = Nothing
     , dueDatePicker = Comp.DatePicker.emptyModel
     , modalEdit = Nothing
+    , tagEditMode = AddTags
     }
 
 
@@ -213,19 +222,48 @@ update flags msg model =
                 newModel =
                     { model | tagModel = m2 }
 
+                mkChange list =
+                    case model.tagEditMode of
+                        AddTags ->
+                            AddTagChange list
+
+                        RemoveTags ->
+                            RemoveTagChange list
+
+                        ReplaceTags ->
+                            ReplaceTagChange list
+
                 change =
                     if isDropdownChangeMsg m then
                         Comp.Dropdown.getSelected newModel.tagModel
                             |> Util.List.distinct
                             |> List.map (\t -> IdName t.id t.name)
                             |> ReferenceList
-                            |> TagChange
+                            |> mkChange
 
                     else
                         NoFormChange
             in
             resultNoCmd change newModel
 
+        ToggleTagEditMode ->
+            let
+                ( m2, _ ) =
+                    Comp.Dropdown.update (Comp.Dropdown.SetSelection []) model.tagModel
+
+                newModel =
+                    { model | tagModel = m2 }
+            in
+            case model.tagEditMode of
+                AddTags ->
+                    resultNone { newModel | tagEditMode = RemoveTags }
+
+                RemoveTags ->
+                    resultNone { newModel | tagEditMode = ReplaceTags }
+
+                ReplaceTags ->
+                    resultNone { newModel | tagEditMode = AddTags }
+
         GetTagsResp (Ok tags) ->
             let
                 tagList =
@@ -554,6 +592,28 @@ renderEditForm cfg settings model =
 
             else
                 span [ class "invisible hidden" ] []
+
+        tagModeIcon =
+            case model.tagEditMode of
+                AddTags ->
+                    i [ class "grey plus link icon" ] []
+
+                RemoveTags ->
+                    i [ class "grey eraser link icon" ] []
+
+                ReplaceTags ->
+                    i [ class "grey redo alternate link icon" ] []
+
+        tagModeMsg =
+            case model.tagEditMode of
+                AddTags ->
+                    "Tags chosen here are *added* to all selected items."
+
+                RemoveTags ->
+                    "Tags chosen here are *removed* from all selected items."
+
+                ReplaceTags ->
+                    "Tags chosen here *replace* those on selected items."
     in
     div [ class cfg.menuClass ]
         [ div [ class "ui form warning" ]
@@ -581,8 +641,17 @@ renderEditForm cfg settings model =
                     [ label []
                         [ Icons.tagsIcon "grey"
                         , text "Tags"
+                        , a
+                            [ class "right-float"
+                            , href "#"
+                            , title "Change tag edit mode"
+                            , onClick ToggleTagEditMode
+                            ]
+                            [ tagModeIcon
+                            ]
                         ]
                     , Html.map TagDropdownMsg (Comp.Dropdown.view settings model.tagModel)
+                    , Markdown.toHtml [ class "small-info" ] tagModeMsg
                     ]
             , div [ class " field" ]
                 [ label [] [ text "Name" ]
diff --git a/modules/webapp/src/main/elm/Comp/ItemDetail/FormChange.elm b/modules/webapp/src/main/elm/Comp/ItemDetail/FormChange.elm
index 802a24b1..b7521ba4 100644
--- a/modules/webapp/src/main/elm/Comp/ItemDetail/FormChange.elm
+++ b/modules/webapp/src/main/elm/Comp/ItemDetail/FormChange.elm
@@ -20,7 +20,9 @@ import Set exposing (Set)
 
 type FormChange
     = NoFormChange
-    | TagChange ReferenceList
+    | AddTagChange ReferenceList
+    | ReplaceTagChange ReferenceList
+    | RemoveTagChange ReferenceList
     | FolderChange (Maybe IdName)
     | DirectionChange Direction
     | OrgChange (Maybe IdName)
@@ -45,13 +47,27 @@ multiUpdate flags ids change receive =
             Set.toList ids
     in
     case change of
-        TagChange tags ->
+        ReplaceTagChange tags ->
             let
                 data =
                     ItemsAndRefs items (List.map .id tags.items)
             in
             Api.setTagsMultiple flags data receive
 
+        AddTagChange tags ->
+            let
+                data =
+                    ItemsAndRefs items (List.map .id tags.items)
+            in
+            Api.addTagsMultiple flags data receive
+
+        RemoveTagChange tags ->
+            let
+                data =
+                    ItemsAndRefs items (List.map .id tags.items)
+            in
+            Api.removeTagsMultiple flags data receive
+
         NameChange name ->
             let
                 data =