diff --git a/invokeai/frontend/web/src/features/controlLayers/store/canvasV2Slice.ts b/invokeai/frontend/web/src/features/controlLayers/store/canvasV2Slice.ts
index 9d9088f75c..4f139dda31 100644
--- a/invokeai/frontend/web/src/features/controlLayers/store/canvasV2Slice.ts
+++ b/invokeai/frontend/web/src/features/controlLayers/store/canvasV2Slice.ts
@@ -6,6 +6,7 @@ import { roundDownToMultiple } from 'common/util/roundDownToMultiple';
 import { bboxReducers } from 'features/controlLayers/store/bboxReducers';
 import { compositingReducers } from 'features/controlLayers/store/compositingReducers';
 import { controlAdaptersReducers } from 'features/controlLayers/store/controlAdaptersReducers';
+import { inpaintMaskReducers } from 'features/controlLayers/store/inpaintMaskReducers';
 import { ipAdaptersReducers } from 'features/controlLayers/store/ipAdaptersReducers';
 import { layersReducers } from 'features/controlLayers/store/layersReducers';
 import { lorasReducers } from 'features/controlLayers/store/lorasReducers';
@@ -29,17 +30,14 @@ const initialState: CanvasV2State = {
   regions: { entities: [] },
   loras: [],
   inpaintMask: {
+    id: 'inpaint_mask',
+    type: 'inpaint_mask',
     bbox: null,
     bboxNeedsUpdate: false,
-    fill: {
-      type: 'color_fill',
-      color: DEFAULT_RGBA_COLOR,
-    },
-    id: 'inpaint_mask',
+    fill: DEFAULT_RGBA_COLOR,
     imageCache: null,
     isEnabled: false,
-    maskObjects: [],
-    type: 'inpaint_mask',
+    objects: [],
     x: 0,
     y: 0,
   },
@@ -135,6 +133,7 @@ export const canvasV2Slice = createSlice({
     ...settingsReducers,
     ...toolReducers,
     ...bboxReducers,
+    ...inpaintMaskReducers,
     widthChanged: (state, action: PayloadAction<{ width: number; updateAspectRatio?: boolean; clamp?: boolean }>) => {
       const { width, updateAspectRatio, clamp } = action.payload;
       state.document.width = clamp ? Math.max(roundDownToMultiple(width, 8), 64) : width;
@@ -314,6 +313,17 @@ export const {
   loraWeightChanged,
   loraIsEnabledChanged,
   loraAllDeleted,
+  // Inpaint mask
+  imReset,
+  imRecalled,
+  imIsEnabledToggled,
+  imTranslated,
+  imBboxChanged,
+  imImageCacheChanged,
+  imBrushLineAdded,
+  imEraserLineAdded,
+  imLinePointAdded,
+  imRectAdded,
 } = canvasV2Slice.actions;
 
 export const selectCanvasV2Slice = (state: RootState) => state.canvasV2;
diff --git a/invokeai/frontend/web/src/features/controlLayers/store/inpaintMaskReducers.ts b/invokeai/frontend/web/src/features/controlLayers/store/inpaintMaskReducers.ts
index 8b13789179..bff4a8a9bb 100644
--- a/invokeai/frontend/web/src/features/controlLayers/store/inpaintMaskReducers.ts
+++ b/invokeai/frontend/web/src/features/controlLayers/store/inpaintMaskReducers.ts
@@ -1 +1,108 @@
+import type { PayloadAction, SliceCaseReducers } from '@reduxjs/toolkit';
+import { getBrushLineId, getEraserLineId, getRectShapeId } from 'features/controlLayers/konva/naming';
+import type { CanvasV2State, InpaintMaskEntity } from 'features/controlLayers/store/types';
+import { imageDTOToImageWithDims } from 'features/controlLayers/store/types';
+import type { IRect } from 'konva/lib/types';
+import type { ImageDTO } from 'services/api/types';
+import { v4 as uuidv4 } from 'uuid';
 
+import type { BrushLineAddedArg, EraserLineAddedArg, PointAddedToLineArg, RectShapeAddedArg, RgbColor } from './types';
+import { isLine } from './types';
+
+export const inpaintMaskReducers = {
+  imReset: (state) => {
+    state.inpaintMask.objects = [];
+    state.inpaintMask.bbox = null;
+    state.inpaintMask.bboxNeedsUpdate = false;
+    state.inpaintMask.imageCache = null;
+  },
+  imRecalled: (state, action: PayloadAction<{ data: InpaintMaskEntity }>) => {
+    const { data } = action.payload;
+    state.inpaintMask = data;
+    state.selectedEntityIdentifier = { type: 'inpaint_mask', id: data.id };
+  },
+  imIsEnabledToggled: (state) => {
+    state.inpaintMask.isEnabled = !state.inpaintMask.isEnabled;
+  },
+  imTranslated: (state, action: PayloadAction<{ x: number; y: number }>) => {
+    const { x, y } = action.payload;
+    state.inpaintMask.x = x;
+    state.inpaintMask.y = y;
+  },
+  imBboxChanged: (state, action: PayloadAction<{ bbox: IRect | null }>) => {
+    const { bbox } = action.payload;
+    state.inpaintMask.bbox = bbox;
+    state.inpaintMask.bboxNeedsUpdate = false;
+  },
+  inpaintMaskFillChanged: (state, action: PayloadAction<{ fill: RgbColor }>) => {
+    const { fill } = action.payload;
+    state.inpaintMask.fill = fill;
+  },
+  imImageCacheChanged: (state, action: PayloadAction<{ imageDTO: ImageDTO | null }>) => {
+    const { imageDTO } = action.payload;
+    state.inpaintMask.imageCache = imageDTO ? imageDTOToImageWithDims(imageDTO) : null;
+  },
+  imBrushLineAdded: {
+    reducer: (state, action: PayloadAction<Omit<BrushLineAddedArg, 'id'> & { lineId: string }>) => {
+      const { points, lineId, color, width, clip } = action.payload;
+      state.inpaintMask.objects.push({
+        id: getBrushLineId(state.inpaintMask.id, lineId),
+        type: 'brush_line',
+        points,
+        strokeWidth: width,
+        color,
+        clip,
+      });
+      state.inpaintMask.bboxNeedsUpdate = true;
+      state.inpaintMask.imageCache = null;
+    },
+    prepare: (payload: Omit<BrushLineAddedArg, 'id'>) => ({
+      payload: { ...payload, lineId: uuidv4() },
+    }),
+  },
+  imEraserLineAdded: {
+    reducer: (state, action: PayloadAction<Omit<EraserLineAddedArg, 'id'> & { lineId: string }>) => {
+      const { points, lineId, width, clip } = action.payload;
+      state.inpaintMask.objects.push({
+        id: getEraserLineId(state.inpaintMask.id, lineId),
+        type: 'eraser_line',
+        points,
+        strokeWidth: width,
+        clip,
+      });
+      state.inpaintMask.bboxNeedsUpdate = true;
+      state.inpaintMask.imageCache = null;
+    },
+    prepare: (payload: Omit<EraserLineAddedArg, 'id'>) => ({
+      payload: { ...payload, lineId: uuidv4() },
+    }),
+  },
+  imLinePointAdded: (state, action: PayloadAction<Omit<PointAddedToLineArg, 'id'>>) => {
+    const { point } = action.payload;
+    const lastObject = state.inpaintMask.objects[state.inpaintMask.objects.length - 1];
+    if (!lastObject || !isLine(lastObject)) {
+      return;
+    }
+    lastObject.points.push(...point);
+    state.inpaintMask.bboxNeedsUpdate = true;
+    state.inpaintMask.imageCache = null;
+  },
+  imRectAdded: {
+    reducer: (state, action: PayloadAction<Omit<RectShapeAddedArg, 'id'> & { rectId: string }>) => {
+      const { rect, rectId, color } = action.payload;
+      if (rect.height === 0 || rect.width === 0) {
+        // Ignore zero-area rectangles
+        return;
+      }
+      state.inpaintMask.objects.push({
+        type: 'rect_shape',
+        id: getRectShapeId(state.inpaintMask.id, rectId),
+        ...rect,
+        color,
+      });
+      state.inpaintMask.bboxNeedsUpdate = true;
+      state.inpaintMask.imageCache = null;
+    },
+    prepare: (payload: Omit<RectShapeAddedArg, 'id'>) => ({ payload: { ...payload, rectId: uuidv4() } }),
+  },
+} satisfies SliceCaseReducers<CanvasV2State>;
diff --git a/invokeai/frontend/web/src/features/controlLayers/store/types.ts b/invokeai/frontend/web/src/features/controlLayers/store/types.ts
index 44ea8cb500..f8410bb4b9 100644
--- a/invokeai/frontend/web/src/features/controlLayers/store/types.ts
+++ b/invokeai/frontend/web/src/features/controlLayers/store/types.ts
@@ -655,8 +655,8 @@ const zInpaintMaskEntity = z.object({
   y: z.number(),
   bbox: zRect.nullable(),
   bboxNeedsUpdate: z.boolean(),
-  maskObjects: z.array(zMaskObject),
-  fill: zFill,
+  objects: z.array(zMaskObject),
+  fill: zRgbColor,
   imageCache: zImageWithDims.nullable(),
 });
 export type InpaintMaskEntity = z.infer<typeof zInpaintMaskEntity>;