diff --git a/src/components/InputBar.test.ts b/src/components/InputBar.test.ts
index 5172973..59598e0 100644
--- a/src/components/InputBar.test.ts
+++ b/src/components/InputBar.test.ts
@@ -5,6 +5,7 @@ import {
   getAvailableSlashCommands,
   getSlashCommandReplacement,
   isClearCommandText,
+  shouldSubmitOnEnter,
 } from "./input-bar";
 
 describe("InputBar slash command helpers", () => {
@@ -46,4 +47,34 @@ describe("InputBar slash command helpers", () => {
       getSlashCommandReplacement({ name: "fix", description: "", source: "codex-skill", defaultPrompt: "bug" }),
     ).toBe("$fix bug");
   });
+
+  it("does not submit enter while IME composition is active", () => {
+    expect(
+      shouldSubmitOnEnter({
+        key: "Enter",
+        shiftKey: false,
+        isComposing: true,
+      }),
+    ).toBe(false);
+    expect(
+      shouldSubmitOnEnter({
+        key: "Enter",
+        shiftKey: false,
+        nativeEvent: { isComposing: true },
+      }),
+    ).toBe(false);
+    expect(
+      shouldSubmitOnEnter({
+        key: "Enter",
+        shiftKey: false,
+        nativeEvent: { keyCode: 229 },
+      }),
+    ).toBe(false);
+  });
+
+  it("submits enter only for non-composition send shortcut", () => {
+    expect(shouldSubmitOnEnter({ key: "Enter", shiftKey: false })).toBe(true);
+    expect(shouldSubmitOnEnter({ key: "Enter", shiftKey: true })).toBe(false);
+    expect(shouldSubmitOnEnter({ key: "a", shiftKey: false })).toBe(false);
+  });
 });
diff --git a/src/components/input-bar/InputBar.tsx b/src/components/input-bar/InputBar.tsx
index 9378449..9dc135d 100644
--- a/src/components/input-bar/InputBar.tsx
+++ b/src/components/input-bar/InputBar.tsx
@@ -46,6 +46,7 @@ import {
   extractEditableContent,
   getAvailableSlashCommands,
   isClearCommandText,
+  shouldSubmitOnEnter,
 } from "./input-bar-utils";
 import { ContextGauge } from "./ContextGauge";
 import { AttachmentPreview } from "./AttachmentPreview";
@@ -543,7 +544,7 @@ export const InputBar = memo(function InputBar({
       return;
     }
 
-    if (e.key === "Enter" && !e.shiftKey) {
+    if (shouldSubmitOnEnter(e)) {
       e.preventDefault();
       if (!isSending && !isAwaitingAcpOptions) {
         handleSend();
diff --git a/src/components/input-bar/index.ts b/src/components/input-bar/index.ts
index 1c4dc31..c8c6bb7 100644
--- a/src/components/input-bar/index.ts
+++ b/src/components/input-bar/index.ts
@@ -7,4 +7,5 @@ export {
   getAvailableSlashCommands,
   getSlashCommandReplacement,
   isClearCommandText,
+  shouldSubmitOnEnter,
 } from "./input-bar-utils";
diff --git a/src/components/input-bar/input-bar-utils.ts b/src/components/input-bar/input-bar-utils.ts
index ccec8d2..d676395 100644
--- a/src/components/input-bar/input-bar-utils.ts
+++ b/src/components/input-bar/input-bar-utils.ts
@@ -146,6 +146,27 @@ export function fuzzyMatch(
   return { match: false, score: 0 };
 }
 
+type EnterKeyEventLike = {
+  key: string;
+  shiftKey: boolean;
+  isComposing?: boolean;
+  nativeEvent?: {
+    isComposing?: boolean;
+    keyCode?: number;
+  };
+};
+
+/** Enter should submit only when not composing text via an IME. */
+export function shouldSubmitOnEnter(event: EnterKeyEventLike): boolean {
+  if (event.key !== "Enter" || event.shiftKey) return false;
+  const nativeEvent = event.nativeEvent;
+  return !(
+    event.isComposing ||
+    nativeEvent?.isComposing ||
+    nativeEvent?.keyCode === 229
+  );
+}
+
 // ── Slash command helpers (exported for tests + external consumers) ──
 
 export const LOCAL_CLEAR_COMMAND: SlashCommand = {