diff --git a/desktop/src/widget-main.tsx b/desktop/src/widget-main.tsx
index 268c9ec..87db751 100644
--- a/desktop/src/widget-main.tsx
+++ b/desktop/src/widget-main.tsx
@@ -1,5 +1,5 @@
 import './forceServerApi';
-import React, { useCallback, useEffect, useMemo, useState } from 'react';
+import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import ReactDOM from 'react-dom/client';
 import { getCurrentWindow } from '@tauri-apps/api/window';
 import { LogicalSize } from '@tauri-apps/api/dpi';
@@ -8,6 +8,7 @@ import { ensureDesktopApiBase } from './ensureDesktopApiBase';
 import FloatingWidgetWindow from '@frontend/components/floatingWidgets/FloatingWidgetWindow';
 import {
   defaultGridFr,
+  NATIVE_WIDGET_PICKER_WINDOW,
   type FloatingWidgetInstance,
 } from '@frontend/types/floatingWidget';
 import type { Theme } from '@frontend/types';
@@ -134,6 +135,27 @@ const WidgetApp: React.FC = () => {
     void getCurrentWindow().close();
   }, []);
 
+  const sizeBeforePickerRef = useRef<{ width: number; height: number } | null>(null);
+
+  const handlePickerOpenChange = useCallback(async (open: boolean) => {
+    const win = getCurrentWindow();
+    if (open) {
+      const size = await win.innerSize();
+      sizeBeforePickerRef.current = { width: size.width, height: size.height };
+      const maxW = Math.max(480, window.screen.availWidth - 48);
+      const maxH = Math.max(520, window.screen.availHeight - 48);
+      const w = Math.min(NATIVE_WIDGET_PICKER_WINDOW.width, maxW);
+      const h = Math.min(NATIVE_WIDGET_PICKER_WINDOW.height, maxH);
+      await win.setSize(new LogicalSize(w, h));
+      await win.center();
+      return;
+    }
+    const prev = sizeBeforePickerRef.current;
+    if (!prev) return;
+    sizeBeforePickerRef.current = null;
+    await win.setSize(new LogicalSize(prev.width, prev.height));
+  }, []);
+
   if (!instance) {
     return <p className="wd-widget-empty">위젯 정보를 불러올 수 없습니다.</p>;
   }
@@ -161,6 +183,7 @@ const WidgetApp: React.FC = () => {
           nativeShell
           onClose={handleClose}
           onFocus={() => {}}
+          onPickerOpenChange={open => { void handlePickerOpenChange(open); }}
           onUpdateSlots={slots => setInstance(prev => (prev ? { ...prev, slots } : prev))}
           onUpdateSize={(width, height) => {
             setInstance(prev => (prev ? { ...prev, width, height } : prev));
diff --git a/frontend/src/components/floatingWidgets/FloatingWidgetWindow.tsx b/frontend/src/components/floatingWidgets/FloatingWidgetWindow.tsx
index 6c16abd..65b027b 100644
--- a/frontend/src/components/floatingWidgets/FloatingWidgetWindow.tsx
+++ b/frontend/src/components/floatingWidgets/FloatingWidgetWindow.tsx
@@ -24,6 +24,8 @@ interface Props {
   onUpdateGridFr: (rowFr: number[], colFr: number[]) => void;
   /** Tauri OS 창 — 네이티브 타이틀·리사이즈 사용, 내부 플로팅 크롬 숨김 */
   nativeShell?: boolean;
+  /** 위젯 선택 팝업 열림/닫힘 (네이티브 창 크기 조절용) */
+  onPickerOpenChange?: (open: boolean) => void;
 }
 
 const FloatingWidgetWindow: React.FC<Props> = ({
@@ -35,8 +37,19 @@ const FloatingWidgetWindow: React.FC<Props> = ({
   onUpdateSize,
   onUpdateGridFr,
   nativeShell = false,
+  onPickerOpenChange,
 }) => {
   const [pickSlotId, setPickSlotId] = useState<string | null>(null);
+
+  const openPicker = useCallback((slotId: string) => {
+    setPickSlotId(slotId);
+    onPickerOpenChange?.(true);
+  }, [onPickerOpenChange]);
+
+  const closePicker = useCallback(() => {
+    setPickSlotId(null);
+    onPickerOpenChange?.(false);
+  }, [onPickerOpenChange]);
   const bodyWrapRef = useRef<HTMLDivElement>(null);
   const bodyRef = useRef<HTMLDivElement>(null);
   const [bodySize, setBodySize] = useState({ width: 0, height: 0 });
@@ -130,8 +143,8 @@ const FloatingWidgetWindow: React.FC<Props> = ({
   const applyWidgetType = useCallback((widgetType: string) => {
     if (!pickSlotId) return;
     updateSlot(pickSlotId, s => ({ ...s, widgetType, config: {} }));
-    setPickSlotId(null);
-  }, [pickSlotId, updateSlot]);
+    closePicker();
+  }, [pickSlotId, updateSlot, closePicker]);
 
   const clearWidget = useCallback((slotId: string) => {
     updateSlot(slotId, s => ({ ...s, widgetType: null, config: {} }));
@@ -233,7 +246,7 @@ const FloatingWidgetWindow: React.FC<Props> = ({
                 <WidgetSlotView
                   slot={slot}
                   zoneId="center"
-                  onPickWidget={id => setPickSlotId(id)}
+                  onPickWidget={openPicker}
                   onClearWidget={id => clearWidget(id)}
                 />
               </div>
@@ -291,7 +304,8 @@ const FloatingWidgetWindow: React.FC<Props> = ({
       <WidgetPickerModal
         open={pickSlotId != null}
         category="all"
-        onClose={() => setPickSlotId(null)}
+        nativeCompact={nativeShell}
+        onClose={closePicker}
         onSelect={applyWidgetType}
       />
     </>
diff --git a/frontend/src/components/widgetDashboard/WidgetPickerModal.tsx b/frontend/src/components/widgetDashboard/WidgetPickerModal.tsx
index 28c6c1c..3a91294 100644
--- a/frontend/src/components/widgetDashboard/WidgetPickerModal.tsx
+++ b/frontend/src/components/widgetDashboard/WidgetPickerModal.tsx
@@ -10,6 +10,8 @@ interface Props {
   category: WidgetPickerCategory;
   onClose: () => void;
   onSelect: (widgetType: string) => void;
+  /** Tauri 네이티브 위젯 창 — 작은 viewport에 맞춘 전체 화면형 팝업 */
+  nativeCompact?: boolean;
 }
 
 const WidgetPickerModal: React.FC<Props> = ({
@@ -17,6 +19,7 @@ const WidgetPickerModal: React.FC<Props> = ({
   category,
   onClose,
   onSelect,
+  nativeCompact = false,
 }) => {
   if (!open) return null;
 
@@ -37,11 +40,12 @@ const WidgetPickerModal: React.FC<Props> = ({
       onClose={onClose}
       title={title}
       titleKo="Widget"
-      width={620}
+      width={720}
       maxWidth="96vw"
       backdrop
       closeOnBackdrop
       zIndex={13200}
+      shellClassName={nativeCompact ? 'app-popup-shell--widget-picker-native' : 'app-popup-shell--widget-picker'}
       bodyClassName="wd-picker-popup-body"
     >
       <p className="wd-layout-intro">{intro}</p>
diff --git a/frontend/src/styles/widgetDashboard.css b/frontend/src/styles/widgetDashboard.css
index 51601ef..5f46a80 100644
--- a/frontend/src/styles/widgetDashboard.css
+++ b/frontend/src/styles/widgetDashboard.css
@@ -1231,6 +1231,29 @@
   line-height: 1.45;
 }
 
+/* 위젯 선택 팝업 — 웹·대시보드 (서버와 동일한 넓은 목록) */
+.app-popup-shell--widget-picker {
+  width: min(720px, 96vw) !important;
+  max-height: min(860px, 92vh);
+}
+
+.app-popup-shell--widget-picker .wd-picker-popup-body {
+  max-height: none;
+}
+
+/* Tauri 네이티브 위젯 창 — OS 창 확대 후 팝업이 거의 전체를 채움 */
+html.fw-native-widget .app-popup-shell--widget-picker-native {
+  width: calc(100vw - 12px) !important;
+  max-width: calc(100vw - 12px) !important;
+  max-height: calc(100vh - 12px);
+  min-height: calc(100vh - 16px);
+}
+
+html.fw-native-widget .app-popup-shell--widget-picker-native .wd-picker-popup-body {
+  flex: 1;
+  min-height: 0;
+}
+
 .bps-page--wd-no-left .bps-side-wrap--left,
 .bps-page--wd-no-left .bps-side-wrap--left + .bps-splitter {
   display: none !important;
diff --git a/frontend/src/types/floatingWidget.ts b/frontend/src/types/floatingWidget.ts
index fe13f99..34d877a 100644
--- a/frontend/src/types/floatingWidget.ts
+++ b/frontend/src/types/floatingWidget.ts
@@ -25,6 +25,9 @@ export const FLOATING_WIDGET_CELL_MIN_W = 140;
 export const FLOATING_WIDGET_CELL_MIN_H = 100;
 export const FLOATING_WIDGET_GRID_GAP = 1;
 
+/** Tauri 네이티브 위젯 창 — 위젯 선택 팝업 표시용 OS 창 크기 */
+export const NATIVE_WIDGET_PICKER_WINDOW = { width: 740, height: 860 } as const;
+
 export interface FloatingWidgetInstance {
   id: string;
   rows: number;