diff --git a/apps/mobile/app/project/[projectId]/viewer.tsx b/apps/mobile/app/project/[projectId]/viewer.tsx
index bdcc65f..86b1b13 100644
--- a/apps/mobile/app/project/[projectId]/viewer.tsx
+++ b/apps/mobile/app/project/[projectId]/viewer.tsx
@@ -3,7 +3,10 @@ import { ActivityIndicator, ScrollView, View } from "react-native"
 import { useLocalSearchParams, useRouter } from "expo-router"
 import { useSafeAreaInsets } from "react-native-safe-area-context"
 import { useColorScheme } from "nativewind"
+import * as Clipboard from "expo-clipboard"
 import ArrowLeftIcon from "lucide-react-native/dist/esm/icons/arrow-left"
+import CheckIcon from "lucide-react-native/dist/esm/icons/check"
+import CopyIcon from "lucide-react-native/dist/esm/icons/copy"
 import FileQuestionIcon from "lucide-react-native/dist/esm/icons/file-question"
 import { Button } from "@/components/ui/button"
 import { Text } from "@/components/ui/text"
@@ -31,6 +34,14 @@ export default function ViewerPage() {
     const [truncated, setTruncated] = useState(false)
     const [loading, setLoading] = useState(true)
     const [error, setError] = useState<string | null>(null)
+    const [copied, setCopied] = useState(false)
+
+    const copyFile = useCallback(async () => {
+        if (!content) return
+        await Clipboard.setStringAsync(content)
+        setCopied(true)
+        setTimeout(() => setCopied(false), 1500)
+    }, [content])
 
     const binary = useMemo(() => isBinaryPath(filePath), [filePath])
     const language = useMemo(() => languageFromPath(filePath), [filePath])
@@ -83,9 +94,18 @@ export default function ViewerPage() {
                     <Text className="text-xs text-muted-foreground line-clamp-1">{directory || "/"}</Text>
                 </View>
                 {!loading && content !== null && (
-                    <View className="px-2.5 py-1.5 rounded-full bg-accent/60 border border-border/50">
-                        <Text className="text-xs text-muted-foreground uppercase">{language}</Text>
-                    </View>
+                    <Button
+                        variant="ghost"
+                        className="w-10 h-10"
+                        onPress={copyFile}
+                        accessibilityLabel={copied ? "File copied" : "Copy file"}
+                    >
+                        {copied ? (
+                            <CheckIcon size={20} color={t.foreground} />
+                        ) : (
+                            <CopyIcon size={20} color={t.foreground} />
+                        )}
+                    </Button>
                 )}
             </View>
 
@@ -114,7 +134,7 @@ export default function ViewerPage() {
                     className="flex-1"
                     contentContainerStyle={{ padding: 12, paddingBottom: insets.bottom + 20 }}
                 >
-                    <CodeBlock text={content ?? ""} language={language} theme={theme} />
+                    <CodeBlock text={content ?? ""} language={language} theme={theme} header={false} lineNumbers />
                     {truncated && (
                         <Text className="text-xs text-muted-foreground text-center mt-3">
                             Preview limited to the first {MAX_LINES.toLocaleString()} lines.
diff --git a/apps/mobile/components/code-block.tsx b/apps/mobile/components/code-block.tsx
index 3141a18..f2475cb 100644
--- a/apps/mobile/components/code-block.tsx
+++ b/apps/mobile/components/code-block.tsx
@@ -20,9 +20,11 @@ interface CodeBlockProps {
     text: string
     language?: string
     theme: "light" | "dark"
+    header?: boolean
+    lineNumbers?: boolean
 }
 
-export function CodeBlock({ text, language, theme }: CodeBlockProps) {
+export function CodeBlock({ text, language, theme, header = true, lineNumbers = false }: CodeBlockProps) {
     const [copied, setCopied] = useState(false)
     ensurePrismLanguages()
     const prismTheme = theme === "dark" ? themes.oneDark : themes.github
@@ -36,6 +38,56 @@ export function CodeBlock({ text, language, theme }: CodeBlockProps) {
         setTimeout(() => setCopied(false), 1500)
     }
 
+    if (!header) {
+        return (
+            <ScrollView horizontal showsHorizontalScrollIndicator={false} contentContainerStyle={{ padding: 4 }}>
+                <Highlight code={code} language={normalizedLanguage} theme={prismTheme}>
+                    {({ tokens, getTokenProps }) => (
+                        <View>
+                            {tokens.map((line, lineIndex) => (
+                                <View key={lineIndex} className="flex-row">
+                                    {lineNumbers && (
+                                        <Text
+                                            style={[
+                                                codeTextStyle,
+                                                {
+                                                    width: 32,
+                                                    marginRight: 12,
+                                                    textAlign: "right",
+                                                    color: THEME[theme].mutedForeground,
+                                                    opacity: 0.6,
+                                                },
+                                            ]}
+                                        >
+                                            {lineIndex + 1}
+                                        </Text>
+                                    )}
+                                    <View className="flex-row flex-shrink-0">
+                                        {line.map((token, tokenIndex) => {
+                                            const tokenProps = getTokenProps({ token })
+                                            return (
+                                                <Text
+                                                    key={tokenIndex}
+                                                    style={[
+                                                        codeTextStyle,
+                                                        { color: prismTheme.plain.color },
+                                                        tokenProps.style as TextStyle | undefined,
+                                                    ]}
+                                                >
+                                                    {tokenProps.children}
+                                                </Text>
+                                            )
+                                        })}
+                                    </View>
+                                </View>
+                            ))}
+                        </View>
+                    )}
+                </Highlight>
+            </ScrollView>
+        )
+    }
+
     return (
         <View
             className="overflow-hidden rounded-lg border border-border/60"
diff --git a/apps/mobile/lib/file-browser.ts b/apps/mobile/lib/file-browser.ts
index 2c65962..0a4fb43 100644
--- a/apps/mobile/lib/file-browser.ts
+++ b/apps/mobile/lib/file-browser.ts
@@ -61,7 +61,16 @@ export async function readFileContent(url: string, token: string, path: string):
         },
     })
     if (!res.ok) throw new Error(`Failed to read file (${res.status})`)
-    const text = await res.text()
+    const raw = await res.text()
+    let text = raw
+    try {
+        const data = JSON.parse(raw) as { content?: unknown; text?: unknown; data?: unknown }
+        if (typeof data.content === "string") text = data.content
+        else if (typeof data.text === "string") text = data.text
+        else if (typeof data.data === "string") text = data.data
+    } catch {
+        text = raw
+    }
     return text.length > MAX_CONTENT_BYTES ? text.slice(0, MAX_CONTENT_BYTES) : text
 }