diff --git a/mobile/lib/features/channels/manage_channel_sheet.dart b/mobile/lib/features/channels/manage_channel_sheet.dart
index 983eb9139e..c330e7cd01 100644
--- a/mobile/lib/features/channels/manage_channel_sheet.dart
+++ b/mobile/lib/features/channels/manage_channel_sheet.dart
@@ -51,7 +51,7 @@ class ManageChannelSheet extends HookConsumerWidget {
         canonicalName.isNotEmpty &&
         (nameDirty || descriptionDirty) &&
         !isSavingDetails.value;
-    final canEditCanvas = !channel.isArchived;
+    final canEditCanvas = channel.isMember && !channel.isArchived;
 
     Future<void> saveDetails() async {
       if (!canSaveDetails) return;
diff --git a/mobile/test/features/channels/channel_actions_sheet_test.dart b/mobile/test/features/channels/channel_actions_sheet_test.dart
index c2565c35ae..dd243db992 100644
--- a/mobile/test/features/channels/channel_actions_sheet_test.dart
+++ b/mobile/test/features/channels/channel_actions_sheet_test.dart
@@ -13,7 +13,11 @@ import 'package:hooks_riverpod/hooks_riverpod.dart';
 
 const _currentPubkey = 'me';
 
-Channel _channel({String type = 'stream', bool isArchived = false}) => Channel(
+Channel _channel({
+  String type = 'stream',
+  bool isArchived = false,
+  bool isMember = true,
+}) => Channel(
   id: 'channel-id',
   name: type == 'dm' ? 'Alice' : 'general',
   channelType: type,
@@ -22,7 +26,7 @@ Channel _channel({String type = 'stream', bool isArchived = false}) => Channel(
   createdBy: 'owner',
   createdAt: DateTime(2025),
   memberCount: 2,
-  isMember: true,
+  isMember: isMember,
   archivedAt: isArchived ? DateTime(2025, 1, 2) : null,
 );
 
@@ -59,6 +63,13 @@ Widget _modalApp({
   overrides: [
     currentPubkeyProvider.overrideWith((ref) => _currentPubkey),
     channelMembersProvider(channel.id).overrideWith((ref) => loadMembers()),
+    channelCanvasProvider(channel.id).overrideWith(
+      (ref) async => const ChannelCanvas(
+        content: null,
+        updatedAt: null,
+        authorPubkey: null,
+      ),
+    ),
     channelActionsProvider.overrideWith(createChannelActions),
   ],
   child: MaterialApp(
@@ -351,6 +362,27 @@ void main() {
     );
   });
 
+  testWidgets('non-member cannot edit canvas from Manage channel', (
+    tester,
+  ) async {
+    await tester.pumpWidget(
+      _modalApp(
+        channel: _channel(isMember: false),
+        loadMembers: () async => const [],
+        createChannelActions: (ref) => _FakeChannelActions(ref),
+      ),
+    );
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('Open actions'));
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('Manage channel'));
+    await tester.pumpAndSettle();
+
+    final editCanvas = find.widgetWithText(FilledButton, 'Create canvas');
+    expect(editCanvas, findsOneWidget);
+    expect(tester.widget<FilledButton>(editCanvas).onPressed, isNull);
+  });
+
   testWidgets('DM omits quick actions, then shows mute and copy rows', (
     tester,
   ) async {