diff --git a/mobile/app/file-detail.tsx b/mobile/app/file-detail.tsx
index 8c878aa..af0baad 100644
--- a/mobile/app/file-detail.tsx
+++ b/mobile/app/file-detail.tsx
@@ -1,29 +1,35 @@
-import React, { useRef, useState, useCallback } from 'react';
+import React, { useRef, useState } from 'react';
 import {
   View,
   Text,
   StyleSheet,
   FlatList,
+  Image,
   Dimensions,
   ActivityIndicator,
   ScrollView,
+  Modal,
+  Pressable,
 } from 'react-native';
 import { RouteProp, useRoute } from '@react-navigation/native';
 import { useFile, useFileImage } from '../hooks/useFiles';
 import { TagChip } from '../components/TagChip';
 import { FileThumbnail } from '../components/FileThumbnail';
+import { GestureHandlerRootView } from 'react-native-gesture-handler';
 import { ZoomableImage } from '../components/ZoomableImage';
 import type { Thumbnail } from '../types';
 
 const SCREEN_WIDTH = Dimensions.get('window').width;
 
+type SelectedImage = { uri: string; width: number; height: number };
+
 type RootStackParamList = {
   FileDetail: { fileIds: string[]; initialIndex: number };
 };
 
 type FileDetailRouteProp = RouteProp<RootStackParamList, 'FileDetail'>;
 
-function DetailItem({ fileId, onScaleChange }: { fileId: string; onScaleChange?: (scale: number) => void }) {
+function DetailItem({ fileId, onSelectImage }: { fileId: string; onSelectImage?: (img: SelectedImage) => void }) {
   const { data: imageData, isLoading: imageLoading } = useFileImage(fileId);
   const { data: fileData } = useFile(fileId);
   const uri = imageData?.data?.url;
@@ -39,24 +45,30 @@ function DetailItem({ fileId, onScaleChange }: { fileId: string; onScaleChange?:
     <ScrollView style={styles.page} contentContainerStyle={styles.pageContent}>
       {hasPages ? (
         fullThumbnails.map((thumb) => (
-          <View key={thumb.id} style={styles.pageImageContainer}>
-            <ZoomableImage
-              uri={thumb.url}
-              width={SCREEN_WIDTH}
-              height={thumb.height * (SCREEN_WIDTH / thumb.width)}
-              onScaleChange={onScaleChange}
+          <Pressable
+            key={thumb.id}
+            style={styles.pageImageContainer}
+            onPress={() => onSelectImage?.({
+              uri: thumb.url,
+              width: SCREEN_WIDTH,
+              height: thumb.height * (SCREEN_WIDTH / thumb.width),
+            })}
+          >
+            <Image
+              source={{ uri: thumb.url }}
+              style={[styles.pageImage, { height: thumb.height * (SCREEN_WIDTH / thumb.width) }]}
+              resizeMode="contain"
             />
-          </View>
+          </Pressable>
         ))
       ) : (
         <View style={styles.imageContainer}>
           {uri ? (
-            <ZoomableImage
-              uri={uri}
-              width={SCREEN_WIDTH}
-              height={SCREEN_WIDTH}
-              onScaleChange={onScaleChange}
-            />
+            <Pressable
+              onPress={() => onSelectImage?.({ uri, width: SCREEN_WIDTH, height: SCREEN_WIDTH })}
+            >
+              <Image source={{ uri }} style={styles.image} resizeMode="contain" />
+            </Pressable>
           ) : file ? (
             <FileThumbnail
               thumbnailUrl={file.data?.thumbnailUrl}
@@ -116,11 +128,7 @@ export function FileDetailScreen() {
 
   const flatListRef = useRef<FlatList>(null);
   const [currentIndex, setCurrentIndex] = useState(initialIndex);
-  const [scrollEnabled, setScrollEnabled] = useState(true);
-
-  const handleScaleChange = useCallback((scale: number) => {
-    setScrollEnabled(scale <= 1);
-  }, []);
+  const [selectedImage, setSelectedImage] = useState<SelectedImage | null>(null);
 
   return (
     <View style={styles.container}>
@@ -134,7 +142,6 @@ export function FileDetailScreen() {
         disableIntervalMomentum
         showsHorizontalScrollIndicator={false}
         initialScrollIndex={initialIndex}
-        scrollEnabled={scrollEnabled}
         getItemLayout={(_, index) => ({
           length: SCREEN_WIDTH,
           offset: SCREEN_WIDTH * index,
@@ -146,7 +153,7 @@ export function FileDetailScreen() {
         }}
         renderItem={({ item }) => (
           <View style={styles.pageWrapper}>
-            <DetailItem fileId={item} onScaleChange={handleScaleChange} />
+            <DetailItem fileId={item} onSelectImage={setSelectedImage} />
           </View>
         )}
       />
@@ -156,6 +163,25 @@ export function FileDetailScreen() {
           {currentIndex + 1} / {fileIds.length}
         </Text>
       </View>
+
+      <Modal
+        visible={selectedImage !== null}
+        transparent
+        animationType="fade"
+        statusBarTranslucent
+        onRequestClose={() => setSelectedImage(null)}
+      >
+        {selectedImage && (
+          <GestureHandlerRootView style={{ flex: 1 }}>
+            <ZoomableImage
+              uri={selectedImage.uri}
+              width={selectedImage.width}
+              height={selectedImage.height}
+              onClose={() => setSelectedImage(null)}
+            />
+          </GestureHandlerRootView>
+        )}
+      </Modal>
     </View>
   );
 }
@@ -180,11 +206,18 @@ const styles = StyleSheet.create({
     alignItems: 'center',
     backgroundColor: '#000',
   },
+  image: {
+    width: SCREEN_WIDTH,
+    height: SCREEN_WIDTH,
+  },
   pageImageContainer: {
     alignItems: 'center',
     backgroundColor: '#000',
     paddingVertical: 4,
   },
+  pageImage: {
+    width: SCREEN_WIDTH,
+  },
   details: {
     backgroundColor: '#fff',
     borderTopLeftRadius: 16,
diff --git a/mobile/components/ZoomableImage.tsx b/mobile/components/ZoomableImage.tsx
index c82293d..d2c67e5 100644
--- a/mobile/components/ZoomableImage.tsx
+++ b/mobile/components/ZoomableImage.tsx
@@ -1,5 +1,5 @@
 import React, { useCallback } from 'react';
-import { StyleSheet } from 'react-native';
+import { StyleSheet, Pressable, View } from 'react-native';
 import Animated, {
   useSharedValue,
   useAnimatedStyle,
@@ -16,14 +16,14 @@ interface ZoomableImageProps {
   uri: string;
   width: number;
   height: number;
-  onScaleChange?: (scale: number) => void;
+  onClose?: () => void;
 }
 
 const MAX_SCALE = 4;
 const DOUBLE_TAP_SCALE = 2.5;
 const SPRING_CONFIG = { damping: 20, stiffness: 200, mass: 0.5 };
 
-export function ZoomableImage({ uri, width, height, onScaleChange }: ZoomableImageProps) {
+export function ZoomableImage({ uri, width, height, onClose }: ZoomableImageProps) {
   const scale = useSharedValue(1);
   const savedScale = useSharedValue(1);
   const translateX = useSharedValue(0);
@@ -31,14 +31,13 @@ export function ZoomableImage({ uri, width, height, onScaleChange }: ZoomableIma
   const savedTranslateX = useSharedValue(0);
   const savedTranslateY = useSharedValue(0);
 
-  const notifyScale = useCallback((s: number) => {
-    onScaleChange?.(s);
-  }, [onScaleChange]);
+  const handleClose = useCallback(() => {
+    onClose?.();
+  }, [onClose]);
 
   const pinch = Gesture.Pinch()
     .onUpdate((e) => {
       scale.value = Math.min(Math.max(savedScale.value * e.scale, 1), MAX_SCALE);
-      runOnJS(notifyScale)(scale.value);
     })
     .onEnd(() => {
       if (scale.value < 1) {
@@ -48,15 +47,13 @@ export function ZoomableImage({ uri, width, height, onScaleChange }: ZoomableIma
         savedScale.value = 1;
         savedTranslateX.value = 0;
         savedTranslateY.value = 0;
-        runOnJS(notifyScale)(1);
       } else {
         savedScale.value = scale.value;
       }
     });
 
   const pan = Gesture.Pan()
-    .minDistance(10)
-    .activeOffsetX([-15, 15])
+    .minDistance(5)
     .onUpdate((e) => {
       if (savedScale.value > 1) {
         translateX.value = savedTranslateX.value + e.translationX;
@@ -72,6 +69,8 @@ export function ZoomableImage({ uri, width, height, onScaleChange }: ZoomableIma
       savedTranslateY.value = translateY.value;
     });
 
+  const zoomGestures = Gesture.Simultaneous(pinch, pan);
+
   const doubleTap = Gesture.Tap()
     .numberOfTaps(2)
     .maxDuration(250)
@@ -83,15 +82,23 @@ export function ZoomableImage({ uri, width, height, onScaleChange }: ZoomableIma
         savedScale.value = 1;
         savedTranslateX.value = 0;
         savedTranslateY.value = 0;
-        runOnJS(notifyScale)(1);
       } else {
         scale.value = withTiming(DOUBLE_TAP_SCALE, { duration: 200 });
         savedScale.value = DOUBLE_TAP_SCALE;
-        runOnJS(notifyScale)(DOUBLE_TAP_SCALE);
       }
     });
 
-  const composed = Gesture.Exclusive(pinch, doubleTap, pan);
+  const singleTap = Gesture.Tap()
+    .maxDuration(250)
+    .onEnd(() => {
+      if (scale.value <= 1) {
+        runOnJS(handleClose)();
+      }
+    });
+
+  const taps = Gesture.Exclusive(doubleTap, singleTap);
+
+  const composed = Gesture.Race(zoomGestures, taps);
 
   const animatedStyle = useAnimatedStyle(() => ({
     transform: [
@@ -102,18 +109,67 @@ export function ZoomableImage({ uri, width, height, onScaleChange }: ZoomableIma
   }));
 
   return (
-    <GestureDetector gesture={composed}>
-      <Animated.Image
-        source={{ uri }}
-        style={[styles.image, { width, height }, animatedStyle]}
-        resizeMode="contain"
-      />
-    </GestureDetector>
+    <View style={styles.container}>
+      <GestureDetector gesture={composed}>
+        <Animated.Image
+          source={{ uri }}
+          style={[styles.image, { width, height }, animatedStyle]}
+          resizeMode="contain"
+        />
+      </GestureDetector>
+      {onClose && (
+        <Pressable style={styles.closeButton} onPress={onClose}>
+          <View style={styles.closeIcon}>
+            <View style={[styles.closeLine, styles.closeLine1]} />
+            <View style={[styles.closeLine, styles.closeLine2]} />
+          </View>
+        </Pressable>
+      )}
+    </View>
   );
 }
 
+const CLOSE_SIZE = 36;
+const CLOSE_LINE = 20;
+
 const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: '#000',
+    justifyContent: 'center',
+    alignItems: 'center',
+  },
   image: {
     overflow: 'hidden',
   },
+  closeButton: {
+    position: 'absolute',
+    top: 56,
+    right: 16,
+    width: CLOSE_SIZE,
+    height: CLOSE_SIZE,
+    borderRadius: CLOSE_SIZE / 2,
+    backgroundColor: 'rgba(255,255,255,0.25)',
+    justifyContent: 'center',
+    alignItems: 'center',
+  },
+  closeIcon: {
+    width: CLOSE_LINE,
+    height: CLOSE_LINE,
+    justifyContent: 'center',
+    alignItems: 'center',
+  },
+  closeLine: {
+    position: 'absolute',
+    width: CLOSE_LINE,
+    height: 2,
+    backgroundColor: '#fff',
+    borderRadius: 1,
+  },
+  closeLine1: {
+    transform: [{ rotate: '45deg' }],
+  },
+  closeLine2: {
+    transform: [{ rotate: '-45deg' }],
+  },
 });