diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80cd51bc4..384a6e3ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@
 - Scale the Layers panel to 5,000-node documents with virtualized rows, indexed updates, scroll-to-selection, range selection, and focus-aware themed states.
 - Add Figma-style horizontal and vertical constraint controls with pin interactions, mixed-selection editing, undo, and responsive frame resizing.
 - Add mixed-selection stroke cap, join, and miter-limit controls with CanvasKit rendering and `.fig` roundtrip support.
+- Add a mixed-selection corner-smoothing percentage control with live preview, per-node undo restoration, and `.fig` roundtrip coverage.
 - Standardize Vue SDK and app override type names on the `UI` acronym, including `FontPickerUI`.
 - Add a headless Vue SDK NumberField with pointer scrubbing, keyboard stepping, safe arithmetic expressions, and mixed/bound states; remove the superseded ScrubInput API.
 - Add provider-driven BindableValue primitives for variable and token binding, including detach-on-edit, read-only, edit-variable, mixed-value, and undo-batched interactions.
diff --git a/packages/core/src/kiwi/fig/node-change/serialize.ts b/packages/core/src/kiwi/fig/node-change/serialize.ts
index 68e174f68..71a41dcae 100644
--- a/packages/core/src/kiwi/fig/node-change/serialize.ts
+++ b/packages/core/src/kiwi/fig/node-change/serialize.ts
@@ -254,7 +254,7 @@ function serializeCornerRadii(node: SceneNode, nc: KiwiNodeChange): void {
     nc.rectangleBottomLeftCornerRadius = node.bottomLeftRadius
     nc.rectangleBottomRightCornerRadius = node.bottomRightRadius
   }
-  if (node.cornerSmoothing > 0) {
+  if (node.cornerSmoothing > 0 || 'cornerSmoothing' in node.source.fig.rawNodeFields) {
     nc.cornerSmoothing = node.cornerSmoothing
   }
 }
diff --git a/packages/docs/development/roadmap.md b/packages/docs/development/roadmap.md
index 0b3fb0561..a623441b0 100644
--- a/packages/docs/development/roadmap.md
+++ b/packages/docs/development/roadmap.md
@@ -145,7 +145,7 @@ Figma's design documentation groups features into these areas:
 | Effects: shadows and blurs                           |     ✅ |     ✅ |      ✅ |                ✅ |      ✅ | `showShadowBehindNode` is rendered but not exposed in UI.                                                                                                                                                                                          |
 | Effect styles                                        |      ↩ |      — |       — |                 ↩ |       — | Style IDs round-trip; no style manager.                                                                                                                                                                                                            |
 | Corner radius                                        |     ✅ |     ✅ |      ✅ |                ✅ |      ✅ | Uniform and independent radii supported.                                                                                                                                                                                                           |
-| Corner smoothing                                     |     ✅ |     ✅ |       — |                ✅ |      ✅ | Figma-style smoothed corners render for common uniform and independent-radius rectangles; exact parity still needs broader fixture tuning.                                                                                                         |
+| Corner smoothing                                     |     ✅ |     ✅ |       ✅ |                ✅ |      ✅ | The inspector supports mixed smoothing percentages with undo; uniform and independent-radius corners render, while exact Figma parity still needs broader fixture tuning.                                                                                                         |
 | Masks                                                |     ✅ |      ◐ |       — |                ✅ |      ✅ | Figma schema `mask`, `maskType`, and `maskIsOutline` fields import and export; common sibling alpha/vector/luminance mask stacks render, including consecutive mask layers. UI controls and deeper Figma edge cases remain incomplete.             |
 | Auto layout: vertical/horizontal                     |     ✅ |     ✅ |      ✅ |                ✅ |      ✅ | Yoga-backed layout.                                                                                                                                                                                                                                |
 | Auto layout: wrap                                    |     ✅ |     ✅ |      ✅ |                ✅ |      ✅ | UI toggle exists.                                                                                                                                                                                                                                  |
diff --git a/packages/docs/programmable/sdk/api/components/appearance-controls-root.md b/packages/docs/programmable/sdk/api/components/appearance-controls-root.md
index b6e676f0c..648b02ada 100644
--- a/packages/docs/programmable/sdk/api/components/appearance-controls-root.md
+++ b/packages/docs/programmable/sdk/api/components/appearance-controls-root.md
@@ -1,6 +1,6 @@
 ---
 title: AppearanceControlsRoot
-description: Headless root primitive for opacity, visibility, blend mode, and corner-radius controls.
+description: Headless root primitive for opacity, visibility, blend mode, corner radius, and smoothing controls.
 ---
 
 <script setup lang="ts">
@@ -17,7 +17,11 @@ That state becomes active when the selected node explicitly uses independent cor
 imported node contains unequal corner values with a stale uniform flag. Consumers should render
 from this state rather than maintaining a parallel local expansion ref.
 
-Multi-node independent-corner toggles and per-corner commits are grouped into one undo entry.
+`cornerSmoothingPercent` exposes the normalized scene value as `0…100` or `MIXED`. Update it
+through the corner actions using normalized `0…1` values.
+
+Multi-node independent-corner toggles, smoothing edits, and per-corner commits are grouped into one
+undo entry while preserving each node's original value.
 
 ## Generated API reference
 
diff --git a/packages/docs/programmable/sdk/api/composables/use-appearance.md b/packages/docs/programmable/sdk/api/composables/use-appearance.md
index 18287fb25..14fec50e5 100644
--- a/packages/docs/programmable/sdk/api/composables/use-appearance.md
+++ b/packages/docs/programmable/sdk/api/composables/use-appearance.md
@@ -1,6 +1,6 @@
 ---
 title: useAppearance
-description: Control visibility, opacity, and corner radius state for the current selection.
+description: Control visibility, opacity, corner radius, and smoothing for the current selection.
 ---
 
 # useAppearance
@@ -12,6 +12,7 @@ It exposes selection-derived UI state for:
 - visibility
 - opacity
 - corner radius
+- corner smoothing as a normalized percentage
 - independent corner radii, including imported unequal-corner state
 - blend mode
 
@@ -30,6 +31,7 @@ const {
   visibilityState,
   opacityPercent,
   cornerRadiusValue,
+  cornerSmoothingPercent,
   showIndependentCorners,
   toggleVisibility,
   toggleIndependentCorners,
@@ -51,6 +53,13 @@ appearance.updateCornerProp('topLeftRadius', 12)
 appearance.commitCornerProp('topLeftRadius', 12, 8)
 ```
 
+### Edit corner smoothing
+
+```ts
+appearance.updateCornerProp('cornerSmoothing', 0.75)
+appearance.commitCornerProp('cornerSmoothing', 0.75, 0)
+```
+
 Render the per-corner editor from `showIndependentCorners`. It accounts for both the explicit
 scene-node flag and imported nodes whose corner values differ. Multi-selection toggles and commits
 are grouped into one undo entry.
diff --git a/packages/vue/src/controls/appearance/helpers.ts b/packages/vue/src/controls/appearance/helpers.ts
index 7ce77ddde..6edabad45 100644
--- a/packages/vue/src/controls/appearance/helpers.ts
+++ b/packages/vue/src/controls/appearance/helpers.ts
@@ -4,7 +4,7 @@ import type { ComputedRef } from 'vue'
 import type { Editor } from '@open-pencil/core/editor'
 import type { BlendMode, SceneNode } from '@open-pencil/scene-graph'
 
-import type { CornerRadiusKey } from '#vue/controls/appearance/types'
+import type { CornerGeometryKey } from '#vue/controls/appearance/types'
 import { MIXED, type MixedValue } from '#vue/controls/node-props/use'
 
 const CORNER_RADIUS_TYPES = new Set([
@@ -56,6 +56,11 @@ export function createAppearanceState({ node, nodes, isMulti, merged }: Appearan
     return node.value?.cornerRadius ?? 0
   })
 
+  const cornerSmoothingPercent = computed(() => {
+    const value = merged('cornerSmoothing')
+    return value === MIXED ? MIXED : Math.round(Math.max(0, Math.min(value, 1)) * 100)
+  })
+
   const opacityPercent = computed(() => {
     const v = merged('opacity')
     return v === MIXED ? MIXED : Math.round(v * 100)
@@ -77,6 +82,7 @@ export function createAppearanceState({ node, nodes, isMulti, merged }: Appearan
     independentCorners,
     showIndependentCorners,
     cornerRadiusValue,
+    cornerSmoothingPercent,
     opacityPercent,
     blendModeValue,
     visibilityState
@@ -84,6 +90,8 @@ export function createAppearanceState({ node, nodes, isMulti, merged }: Appearan
 }
 
 export function createAppearanceActions({ editor, node, nodes, isMulti }: AppearanceActionOptions) {
+  const previousCornerValues = new Map<CornerGeometryKey, Map<string, number>>()
+
   function setBlendMode(value: BlendMode) {
     const selected = node.value
     const targets = isMulti.value ? nodes.value : []
@@ -166,28 +174,40 @@ export function createAppearanceActions({ editor, node, nodes, isMulti }: Appear
     )
   }
 
-  function updateCornerProp(key: CornerRadiusKey, value: number) {
-    if (isMulti.value) {
-      for (const n of nodes.value) editor.updateNode(n.id, { [key]: value })
-    } else {
-      const n = node.value
-      if (n) editor.updateNode(n.id, { [key]: value })
+  function cornerTargets() {
+    if (isMulti.value) return nodes.value
+    const selected = node.value
+    return selected ? [selected] : []
+  }
+
+  function updateCornerProp(key: CornerGeometryKey, value: number) {
+    let snapshots = previousCornerValues.get(key)
+    if (!snapshots) {
+      snapshots = new Map()
+      previousCornerValues.set(key, snapshots)
+    }
+    const normalized = key === 'cornerSmoothing' ? Math.max(0, Math.min(value, 1)) : value
+    for (const target of cornerTargets()) {
+      if (!snapshots.has(target.id)) snapshots.set(target.id, target[key])
+      editor.updateNode(target.id, { [key]: normalized })
     }
   }
 
-  function commitCornerProp(key: CornerRadiusKey, _value: number, previous: number) {
-    if (isMulti.value) {
-      editor.undo.runBatch(`Change ${key}`, () => {
-        for (const n of nodes.value) {
-          editor.commitNodeUpdate(n.id, { [key]: previous } as Partial<SceneNode>, `Change ${key}`)
-        }
-      })
-    } else {
-      const n = node.value
-      if (n) {
-        editor.commitNodeUpdate(n.id, { [key]: previous } as Partial<SceneNode>, `Change ${key}`)
+  function commitCornerProp(key: CornerGeometryKey, _value: number, previous: number) {
+    const targets = cornerTargets()
+    const snapshots = previousCornerValues.get(key)
+    const commit = () => {
+      for (const target of targets) {
+        editor.commitNodeUpdate(
+          target.id,
+          { [key]: snapshots?.get(target.id) ?? previous } as Partial<SceneNode>,
+          `Change ${key}`
+        )
       }
     }
+    if (targets.length > 1) editor.undo.runBatch(`Change ${key}`, commit)
+    else commit()
+    previousCornerValues.delete(key)
   }
 
   return {
diff --git a/packages/vue/src/controls/appearance/types.ts b/packages/vue/src/controls/appearance/types.ts
index 29ee745d5..d1271b24d 100644
--- a/packages/vue/src/controls/appearance/types.ts
+++ b/packages/vue/src/controls/appearance/types.ts
@@ -3,3 +3,5 @@ export type CornerRadiusKey =
   | 'topRightRadius'
   | 'bottomRightRadius'
   | 'bottomLeftRadius'
+
+export type CornerGeometryKey = CornerRadiusKey | 'cornerSmoothing'
diff --git a/packages/vue/src/i18n/locales/de/panels.json b/packages/vue/src/i18n/locales/de/panels.json
index e0cdbc522..df8bf0da9 100644
--- a/packages/vue/src/i18n/locales/de/panels.json
+++ b/packages/vue/src/i18n/locales/de/panels.json
@@ -178,6 +178,7 @@
   "height": "Höhe",
   "opacity": "Deckkraft",
   "radius": "Radius",
+  "cornerSmoothing": "Eckenglättung",
   "spread": "Ausbreitung",
   "foregroundBlur": "Vordergrund-Weichzeichnung",
   "strokeType": "Linientyp",
diff --git a/packages/vue/src/i18n/locales/es/panels.json b/packages/vue/src/i18n/locales/es/panels.json
index 89bf3dcb2..b1935c15c 100644
--- a/packages/vue/src/i18n/locales/es/panels.json
+++ b/packages/vue/src/i18n/locales/es/panels.json
@@ -20,6 +20,7 @@
   "height": "Altura",
   "opacity": "Opacidad",
   "radius": "Redondeado",
+  "cornerSmoothing": "Suavizado de esquinas",
   "spread": "Esparcimiento",
   "fill": "Relleno",
   "stroke": "Trazo",
diff --git a/packages/vue/src/i18n/locales/fr/panels.json b/packages/vue/src/i18n/locales/fr/panels.json
index 41f698057..e96853a7c 100644
--- a/packages/vue/src/i18n/locales/fr/panels.json
+++ b/packages/vue/src/i18n/locales/fr/panels.json
@@ -178,6 +178,7 @@
   "height": "Hauteur",
   "opacity": "Opacité",
   "radius": "Rayon",
+  "cornerSmoothing": "Lissage des coins",
   "spread": "Diffusion",
   "foregroundBlur": "Flou de premier plan",
   "strokeType": "Type de contour",
diff --git a/packages/vue/src/i18n/locales/it/panels.json b/packages/vue/src/i18n/locales/it/panels.json
index 97ecce591..8edb6d364 100644
--- a/packages/vue/src/i18n/locales/it/panels.json
+++ b/packages/vue/src/i18n/locales/it/panels.json
@@ -178,6 +178,7 @@
   "height": "Altezza",
   "opacity": "Opacità",
   "radius": "Raggio",
+  "cornerSmoothing": "Smussatura degli angoli",
   "spread": "Diffusione",
   "foregroundBlur": "Sfocatura primo piano",
   "strokeType": "Tipo tratto",
diff --git a/packages/vue/src/i18n/locales/ja/panels.json b/packages/vue/src/i18n/locales/ja/panels.json
index 6520ad619..966354541 100644
--- a/packages/vue/src/i18n/locales/ja/panels.json
+++ b/packages/vue/src/i18n/locales/ja/panels.json
@@ -20,6 +20,7 @@
   "height": "高さ",
   "opacity": "不透明度",
   "radius": "角丸",
+  "cornerSmoothing": "コーナーの滑らかさ",
   "spread": "スプレッド",
   "fill": "塗り",
   "stroke": "線",
diff --git a/packages/vue/src/i18n/locales/pl/panels.json b/packages/vue/src/i18n/locales/pl/panels.json
index 5ae6daa58..5e7ed26d3 100644
--- a/packages/vue/src/i18n/locales/pl/panels.json
+++ b/packages/vue/src/i18n/locales/pl/panels.json
@@ -178,6 +178,7 @@
   "height": "Wysokość",
   "opacity": "Krycie",
   "radius": "Promień",
+  "cornerSmoothing": "Wygładzanie narożników",
   "spread": "Rozproszenie",
   "foregroundBlur": "Rozmycie pierwszego planu",
   "strokeType": "Typ obrysu",
diff --git a/packages/vue/src/i18n/locales/ru/panels.json b/packages/vue/src/i18n/locales/ru/panels.json
index d51e5753b..d7fda4e9c 100644
--- a/packages/vue/src/i18n/locales/ru/panels.json
+++ b/packages/vue/src/i18n/locales/ru/panels.json
@@ -178,6 +178,7 @@
   "height": "Высота",
   "opacity": "Непрозрачность",
   "radius": "Радиус",
+  "cornerSmoothing": "Сглаживание углов",
   "spread": "Размах",
   "foregroundBlur": "Размытие переднего плана",
   "strokeType": "Тип обводки",
diff --git a/packages/vue/src/i18n/locales/zh-cn/panels.json b/packages/vue/src/i18n/locales/zh-cn/panels.json
index 412d250be..dfd7fde71 100644
--- a/packages/vue/src/i18n/locales/zh-cn/panels.json
+++ b/packages/vue/src/i18n/locales/zh-cn/panels.json
@@ -178,6 +178,7 @@
   "height": "高度",
   "opacity": "不透明度",
   "radius": "圆角",
+  "cornerSmoothing": "圆角平滑度",
   "spread": "扩展",
   "foregroundBlur": "前景模糊",
   "strokeType": "描边类型",
diff --git a/packages/vue/src/i18n/messages/panels.ts b/packages/vue/src/i18n/messages/panels.ts
index 663bc1773..85b7d6d47 100644
--- a/packages/vue/src/i18n/messages/panels.ts
+++ b/packages/vue/src/i18n/messages/panels.ts
@@ -33,6 +33,7 @@ export const panelMessageDefaults = {
   opacity: 'Opacity',
   blendMode: 'Blend mode',
   radius: 'Radius',
+  cornerSmoothing: 'Corner smoothing',
   spread: 'Spread',
 
   page: 'Page',
diff --git a/packages/vue/src/index.ts b/packages/vue/src/index.ts
index f43c7d05c..3f60e0d9d 100644
--- a/packages/vue/src/index.ts
+++ b/packages/vue/src/index.ts
@@ -204,7 +204,7 @@ export {
   useConstraints
 } from '#vue/controls/constraints'
 export type { ConstraintAxis, ConstraintEdge, ConstraintValue } from '#vue/controls/constraints'
-export type { CornerRadiusKey } from '#vue/controls/appearance/types'
+export type { CornerGeometryKey, CornerRadiusKey } from '#vue/controls/appearance/types'
 export { PageListRoot } from '#vue/primitives/PageList'
 export { PositionControlsRoot } from '#vue/primitives/PositionControls'
 export { useEditorPropertyList } from '#vue/controls/property-list'
diff --git a/packages/vue/src/primitives/AppearanceControls/AppearanceControlsRoot.vue b/packages/vue/src/primitives/AppearanceControls/AppearanceControlsRoot.vue
index 2122502d5..cde5265cb 100644
--- a/packages/vue/src/primitives/AppearanceControls/AppearanceControlsRoot.vue
+++ b/packages/vue/src/primitives/AppearanceControls/AppearanceControlsRoot.vue
@@ -24,6 +24,7 @@ const actions = {
     :independent-corners="ctx.independentCorners.value"
     :show-independent-corners="ctx.showIndependentCorners.value"
     :corner-radius-value="ctx.cornerRadiusValue.value"
+    :corner-smoothing-percent="ctx.cornerSmoothingPercent.value"
     :opacity-percent="ctx.opacityPercent.value"
     :blend-mode-value="ctx.blendModeValue.value"
     :visibility-state="ctx.visibilityState.value"
diff --git a/packages/vue/src/primitives/AppearanceControls/types.ts b/packages/vue/src/primitives/AppearanceControls/types.ts
index 1b205b8b7..157885f64 100644
--- a/packages/vue/src/primitives/AppearanceControls/types.ts
+++ b/packages/vue/src/primitives/AppearanceControls/types.ts
@@ -2,7 +2,7 @@ import type { VNode } from 'vue'
 
 import type { BlendMode, SceneNode } from '@open-pencil/scene-graph'
 
-import type { CornerRadiusKey } from '#vue/controls/appearance/types'
+import type { CornerGeometryKey } from '#vue/controls/appearance/types'
 import type { MixedValue } from '#vue/controls/node-props/use'
 
 export interface AppearanceControlsActions {
@@ -11,8 +11,8 @@ export interface AppearanceControlsActions {
   setBlendMode(value: BlendMode): void
   toggleVisibility(): void
   toggleIndependentCorners(): void
-  updateCornerProp(key: CornerRadiusKey, value: number): void
-  commitCornerProp(key: CornerRadiusKey, value: number, previous: number): void
+  updateCornerProp(key: CornerGeometryKey, value: number): void
+  commitCornerProp(key: CornerGeometryKey, value: number, previous: number): void
 }
 
 export interface AppearanceControlsRootSlotProps {
@@ -23,6 +23,7 @@ export interface AppearanceControlsRootSlotProps {
   independentCorners: MixedValue<boolean>
   showIndependentCorners: boolean
   cornerRadiusValue: MixedValue<number>
+  cornerSmoothingPercent: MixedValue<number>
   opacityPercent: MixedValue<number>
   blendModeValue: MixedValue<BlendMode>
   visibilityState: 'visible' | 'hidden' | 'mixed'
diff --git a/src/components/properties/AppearanceSection.vue b/src/components/properties/AppearanceSection.vue
index 165e25c6d..373ecee13 100644
--- a/src/components/properties/AppearanceSection.vue
+++ b/src/components/properties/AppearanceSection.vue
@@ -54,6 +54,7 @@ function blendModeOptions(value: BlendMode | typeof MIXED) {
       independentCorners,
       showIndependentCorners,
       cornerRadiusValue,
+      cornerSmoothingPercent,
       opacityPercent,
       blendModeValue,
       visibilityState,
@@ -221,6 +222,28 @@ function blendModeOptions(value: BlendMode | typeof MIXED) {
         />
         <PanelRail />
       </PanelGrid>
+
+      <PanelGrid v-if="hasCornerRadius" columns="fill" class="mt-panel">
+        <PanelFieldGroup :label="panels.cornerSmoothing">
+          <NumberField
+            suffix="%"
+            :model-value="cornerSmoothingPercent"
+            :min="0"
+            :max="100"
+            :aria-label="panels.cornerSmoothing"
+            data-property="corner-smoothing"
+            @update:model-value="actions.updateCornerProp('cornerSmoothing', $event / 100)"
+            @commit="
+              (v: number, p: number) =>
+                actions.commitCornerProp('cornerSmoothing', v / 100, p / 100)
+            "
+          >
+            <template #icon>
+              <icon-lucide-squircle class="size-3" />
+            </template>
+          </NumberField>
+        </PanelFieldGroup>
+      </PanelGrid>
     </PanelSection>
   </AppearanceControlsRoot>
 </template>
diff --git a/tests/e2e/canvas/corner-smoothing-visual.spec.ts b/tests/e2e/canvas/corner-smoothing-visual.spec.ts
new file mode 100644
index 000000000..392692867
--- /dev/null
+++ b/tests/e2e/canvas/corner-smoothing-visual.spec.ts
@@ -0,0 +1,60 @@
+import { expect, test, useEditorSetupWithClear } from '#tests/e2e/fixtures'
+
+const editor = useEditorSetupWithClear('/?test&no-chrome&no-rulers')
+
+test('regular partial full and independent corner smoothing', async () => {
+  await editor.page.evaluate(() => {
+    const store = window.openPencil?.getStore?.()
+    if (!store) throw new Error('OpenPencil store not initialized')
+    const pageId = store.state.currentPageId
+    const smoothingValues = [0, 0.5, 1]
+    for (const [index, cornerSmoothing] of smoothingValues.entries()) {
+      store.graph.createNode('RECTANGLE', pageId, {
+        name: `Corner smoothing ${cornerSmoothing}`,
+        x: 70 + index * 180,
+        y: 90,
+        width: 140,
+        height: 120,
+        cornerRadius: 42,
+        cornerSmoothing,
+        fills: [
+          {
+            type: 'SOLID',
+            color: { r: 0.23, g: 0.51, b: 0.96, a: 1 },
+            visible: true,
+            opacity: 1
+          }
+        ]
+      })
+    }
+
+    store.graph.createNode('RECTANGLE', pageId, {
+      name: 'Independent smoothed corners',
+      x: 610,
+      y: 90,
+      width: 160,
+      height: 120,
+      independentCorners: true,
+      topLeftRadius: 50,
+      topRightRadius: 20,
+      bottomRightRadius: 50,
+      bottomLeftRadius: 8,
+      cornerSmoothing: 1,
+      fills: [
+        {
+          type: 'SOLID',
+          color: { r: 0.96, g: 0.35, b: 0.12, a: 1 },
+          visible: true,
+          opacity: 1
+        }
+      ]
+    })
+
+    store.clearSelection()
+    store.requestRender()
+  })
+  await editor.canvas.waitForRender()
+  editor.canvas.assertNoErrors()
+  const buffer = await editor.canvas.canvas.screenshot()
+  expect(buffer).toMatchSnapshot('corner-smoothing-profiles.png')
+})
diff --git a/tests/e2e/canvas/corner-smoothing-visual.spec.ts-snapshots/corner-smoothing-profiles-openpencil-darwin.png b/tests/e2e/canvas/corner-smoothing-visual.spec.ts-snapshots/corner-smoothing-profiles-openpencil-darwin.png
new file mode 100644
index 000000000..d66990919
Binary files /dev/null and b/tests/e2e/canvas/corner-smoothing-visual.spec.ts-snapshots/corner-smoothing-profiles-openpencil-darwin.png differ
diff --git a/tests/e2e/properties/corner-smoothing.spec.ts b/tests/e2e/properties/corner-smoothing.spec.ts
new file mode 100644
index 000000000..bea46250d
--- /dev/null
+++ b/tests/e2e/properties/corner-smoothing.spec.ts
@@ -0,0 +1,103 @@
+import { expect, test, type Page } from '@playwright/test'
+
+import { CanvasHelper } from '#tests/helpers/canvas'
+import { propertySection } from '#tests/helpers/properties'
+
+let page: Page
+let canvas: CanvasHelper
+
+test.describe.configure({ mode: 'serial' })
+
+test.beforeAll(async ({ browser }) => {
+  page = await browser.newPage()
+  await page.goto('/')
+  canvas = new CanvasHelper(page)
+  await canvas.waitForInit()
+})
+
+test.afterAll(async () => {
+  await page.close()
+})
+
+async function drawFrame(x: number, y: number) {
+  await canvas.pressKey('f')
+  await canvas.drag(x, y, x + 120, y + 80)
+  await canvas.waitForRender()
+}
+
+async function selectedSmoothing() {
+  return page.evaluate(() => {
+    const store = window.openPencil?.getStore?.()
+    if (!store) throw new Error('OpenPencil store not initialized')
+    return [...store.state.selectedIds].map(
+      (id) => store.graph.getNode(id)?.cornerSmoothing ?? null
+    )
+  })
+}
+
+async function fillSmoothing(value: string) {
+  const section = propertySection(page, 'Appearance')
+  await section.getByRole('spinbutton', { name: 'Corner smoothing' }).focus()
+  const input = section.getByRole('spinbutton', { name: 'Corner smoothing' })
+  await input.fill(value)
+  await input.press('Enter')
+  await canvas.waitForRender()
+}
+
+test('shows smoothing for corner-capable nodes and keeps it with independent radii', async () => {
+  await drawFrame(100, 100)
+  const smoothing = page.locator('[data-property="corner-smoothing"]')
+  await expect(smoothing).toBeVisible()
+
+  const independent = propertySection(page, 'Appearance').getByRole('button', {
+    name: 'Independent corner radii'
+  })
+  await independent.click()
+  await canvas.waitForRender()
+  await expect(page.locator('[data-corner-grid]')).toBeVisible()
+  await expect(smoothing).toBeVisible()
+
+  await canvas.pressKey('l')
+  await canvas.drag(300, 100, 420, 160)
+  await canvas.waitForRender()
+  await expect(smoothing).not.toBeVisible()
+})
+
+test('updates normalized smoothing and undoes the committed edit', async () => {
+  await drawFrame(100, 240)
+  await page.evaluate(() => {
+    const store = window.openPencil?.getStore?.()
+    if (!store) throw new Error('OpenPencil store not initialized')
+    const id = [...store.state.selectedIds][0]
+    if (id) store.updateNode(id, { cornerRadius: 24 })
+  })
+  await fillSmoothing('75')
+  expect(await selectedSmoothing()).toEqual([0.75])
+
+  await canvas.pressKey('Meta+z')
+  await canvas.waitForRender()
+  expect(await selectedSmoothing()).toEqual([0])
+})
+
+test('restores mixed per-node values in one undo step', async () => {
+  await canvas.clearCanvas()
+  await drawFrame(80, 80)
+  await drawFrame(260, 80)
+  await canvas.pressKey('Meta+a')
+  await canvas.waitForRender()
+  await page.evaluate(() => {
+    const store = window.openPencil?.getStore?.()
+    if (!store) throw new Error('OpenPencil store not initialized')
+    const ids = [...store.state.selectedIds]
+    if (ids[0]) store.updateNode(ids[0], { cornerRadius: 20, cornerSmoothing: 0.2 })
+    if (ids[1]) store.updateNode(ids[1], { cornerRadius: 20, cornerSmoothing: 0.8 })
+  })
+  await canvas.waitForRender()
+
+  await fillSmoothing('60')
+  expect(await selectedSmoothing()).toEqual([0.6, 0.6])
+
+  await canvas.pressKey('Meta+z')
+  await canvas.waitForRender()
+  expect(await selectedSmoothing()).toEqual([0.2, 0.8])
+})
diff --git a/tests/engine/io/fig/export/corner-smoothing.test.ts b/tests/engine/io/fig/export/corner-smoothing.test.ts
new file mode 100644
index 000000000..a7d48b446
--- /dev/null
+++ b/tests/engine/io/fig/export/corner-smoothing.test.ts
@@ -0,0 +1,40 @@
+import { describe, expect, test } from 'bun:test'
+
+import { SceneGraph } from '@open-pencil/scene-graph'
+
+import { sceneNodeToKiwi } from '#core/kiwi/fig/node-change/serialize'
+
+function serializeCornerSmoothing(value: number, importedValue?: number) {
+  const graph = new SceneGraph()
+  const page = graph.getPages()[0]
+  const node = graph.createNode('RECTANGLE', page.id, { cornerRadius: 24, cornerSmoothing: value })
+  if (importedValue !== undefined) {
+    graph.updateNode(node.id, {
+      source: {
+        ...node.source,
+        id: '1:2',
+        fig: {
+          ...node.source.fig,
+          rawNodeFields: {
+            ...node.source.fig.rawNodeFields,
+            cornerSmoothing: importedValue
+          }
+        }
+      }
+    })
+  }
+  const current = graph.getNode(node.id)
+  if (!current) throw new Error('Expected rectangle node')
+  return sceneNodeToKiwi(current, { sessionID: 1, localID: 1 }, 0, { value: 2 }, graph, [])[0]
+    .cornerSmoothing
+}
+
+describe('Figma corner smoothing export', () => {
+  test('exports normalized smoothing values', () => {
+    expect(serializeCornerSmoothing(0.72)).toBe(0.72)
+  })
+
+  test('overrides stale imported smoothing when edited back to zero', () => {
+    expect(serializeCornerSmoothing(0, 0.72)).toBe(0)
+  })
+})
diff --git a/tests/engine/io/fig/import/legacy/corners.test.ts b/tests/engine/io/fig/import/legacy/corners.test.ts
new file mode 100644
index 000000000..e1a940edf
--- /dev/null
+++ b/tests/engine/io/fig/import/legacy/corners.test.ts
@@ -0,0 +1,22 @@
+import { describe, expect, test } from 'bun:test'
+
+import { importNodeChanges } from '@open-pencil/core'
+import type { NodeChange } from '@open-pencil/kiwi/fig/codec'
+
+import { canvas, doc, node } from './helpers'
+
+describe('fig-import: corner geometry', () => {
+  test('imports corner smoothing', () => {
+    const graph = importNodeChanges([
+      doc(),
+      canvas(),
+      node('RECTANGLE', 10, 1, {
+        cornerRadius: 24,
+        cornerSmoothing: 0.72
+      } as Partial<NodeChange>)
+    ])
+    const imported = graph.getChildren(graph.getPages()[0].id)[0]
+    expect(imported.cornerRadius).toBe(24)
+    expect(imported.cornerSmoothing).toBe(0.72)
+  })
+})
diff --git a/tests/engine/vue/controls/appearance.test.ts b/tests/engine/vue/controls/appearance.test.ts
index c7f89bb85..90946ad4a 100644
--- a/tests/engine/vue/controls/appearance.test.ts
+++ b/tests/engine/vue/controls/appearance.test.ts
@@ -2,10 +2,11 @@ import { describe, expect, test } from 'bun:test'
 
 import { computed, ref } from 'vue'
 
+import { createEditor } from '@open-pencil/core/editor'
 import type { SceneNode } from '@open-pencil/scene-graph'
-import type { MixedValue } from '@open-pencil/vue'
+import { MIXED, type MixedValue } from '@open-pencil/vue'
 
-import { createAppearanceState } from '#vue/controls/appearance/helpers'
+import { createAppearanceActions, createAppearanceState } from '#vue/controls/appearance/helpers'
 
 import { createRect, firstPageId, makeSceneGraph } from '#tests/helpers/scene'
 
@@ -61,4 +62,62 @@ describe('appearance control state', () => {
     const state = appearanceState(node, true)
     expect(state.showIndependentCorners.value).toBe(false)
   })
+
+  test('presents normalized corner smoothing as a percentage', () => {
+    const node = rectangle()
+    node.cornerSmoothing = 0.735
+    const state = appearanceState(node)
+    expect(state.cornerSmoothingPercent.value).toBe(74)
+  })
+
+  test('keeps independent corner preview and undo behavior', () => {
+    const graph = makeSceneGraph()
+    const pageId = firstPageId(graph)
+    const rect = graph.createNode('RECTANGLE', pageId, {
+      independentCorners: true,
+      topLeftRadius: 8
+    })
+    const editor = createEditor({ graph })
+    const actions = createAppearanceActions({
+      editor,
+      node: computed(() => graph.getNode(rect.id) ?? null),
+      nodes: computed(() => []),
+      isMulti: computed(() => false),
+      merged: (key) => graph.getNode(rect.id)?.[key] ?? MIXED
+    })
+
+    actions.updateCornerProp('topLeftRadius', 20)
+    actions.commitCornerProp('topLeftRadius', 20, 8)
+    expect(graph.getNode(rect.id)?.topLeftRadius).toBe(20)
+    editor.undo.undo()
+    expect(graph.getNode(rect.id)?.topLeftRadius).toBe(8)
+  })
+
+  test('restores each mixed smoothing value in one undo step', () => {
+    const graph = makeSceneGraph()
+    const pageId = firstPageId(graph)
+    const first = graph.createNode('RECTANGLE', pageId, { cornerSmoothing: 0.2 })
+    const second = graph.createNode('RECTANGLE', pageId, { cornerSmoothing: 0.8 })
+    const editor = createEditor({ graph })
+    const nodes = computed(() => {
+      const selected = [graph.getNode(first.id), graph.getNode(second.id)]
+      return selected.filter((value): value is SceneNode => value !== undefined)
+    })
+    const actions = createAppearanceActions({
+      editor,
+      node: computed(() => null),
+      nodes,
+      isMulti: computed(() => true),
+      merged: () => MIXED
+    })
+
+    actions.updateCornerProp('cornerSmoothing', 1.4)
+    expect(graph.getNode(first.id)?.cornerSmoothing).toBe(1)
+    expect(graph.getNode(second.id)?.cornerSmoothing).toBe(1)
+    actions.commitCornerProp('cornerSmoothing', 1, 0)
+
+    editor.undo.undo()
+    expect(graph.getNode(first.id)?.cornerSmoothing).toBe(0.2)
+    expect(graph.getNode(second.id)?.cornerSmoothing).toBe(0.8)
+  })
 })