diff --git a/.changeset/settings-sync.md b/.changeset/settings-sync.md
new file mode 100644
index 000000000..5b5b1cf49
--- /dev/null
+++ b/.changeset/settings-sync.md
@@ -0,0 +1,5 @@
+---
+default: patch
+---
+
+Exclude enterForNewline from cross-device settings sync.
diff --git a/src/app/utils/settingsSync.test.ts b/src/app/utils/settingsSync.test.ts
index 608a94343..b80a589bc 100644
--- a/src/app/utils/settingsSync.test.ts
+++ b/src/app/utils/settingsSync.test.ts
@@ -32,6 +32,7 @@ describe('NON_SYNCABLE_KEYS', () => {
       'isWidgetDrawer',
       'memberSortFilterIndex',
       'developerTools',
+      'enterForNewline',
       'settingsSyncEnabled',
     ] as const;
 
diff --git a/src/app/utils/settingsSync.ts b/src/app/utils/settingsSync.ts
index 83c8ff11f..95d4945e7 100644
--- a/src/app/utils/settingsSync.ts
+++ b/src/app/utils/settingsSync.ts
@@ -16,6 +16,9 @@ export const NON_SYNCABLE_KEYS = new Set<keyof Settings>([
   'memberSortFilterIndex',
   // Developer / diagnostic
   'developerTools',
+  // Input behaviour — on mobile the Enter-for-newline toggle is disabled, so syncing a
+  // desktop value would inadvertently re-enable Enter-to-send on the user's phone
+  'enterForNewline',
   // Sync toggle itself must never be uploaded (it's device-local)
   'settingsSyncEnabled',
 ]);