diff --git a/apps/desktop/src/renderer/hotkeys/utils/utils.test.ts b/apps/desktop/src/renderer/hotkeys/utils/utils.test.ts
new file mode 100644
index 00000000000..bd785b8ac17
--- /dev/null
+++ b/apps/desktop/src/renderer/hotkeys/utils/utils.test.ts
@@ -0,0 +1,125 @@
+import { describe, expect, test } from "bun:test";
+import { isTerminalReservedEvent } from "./utils";
+
+function makeKeyboardEvent(
+	overrides: Partial<KeyboardEvent> & { code: string; key: string },
+): KeyboardEvent {
+	return {
+		type: "keydown",
+		ctrlKey: false,
+		metaKey: false,
+		altKey: false,
+		shiftKey: false,
+		...overrides,
+	} as unknown as KeyboardEvent;
+}
+
+describe("isTerminalReservedEvent", () => {
+	test("recognises Ctrl+C with Latin input", () => {
+		expect(
+			isTerminalReservedEvent(
+				makeKeyboardEvent({ code: "KeyC", key: "c", ctrlKey: true }),
+			),
+		).toBe(true);
+	});
+
+	test("recognises Ctrl+D with Latin input", () => {
+		expect(
+			isTerminalReservedEvent(
+				makeKeyboardEvent({ code: "KeyD", key: "d", ctrlKey: true }),
+			),
+		).toBe(true);
+	});
+
+	test("recognises Ctrl+Z with Latin input", () => {
+		expect(
+			isTerminalReservedEvent(
+				makeKeyboardEvent({ code: "KeyZ", key: "z", ctrlKey: true }),
+			),
+		).toBe(true);
+	});
+
+	test("recognises Ctrl+S with Latin input", () => {
+		expect(
+			isTerminalReservedEvent(
+				makeKeyboardEvent({ code: "KeyS", key: "s", ctrlKey: true }),
+			),
+		).toBe(true);
+	});
+
+	test("recognises Ctrl+Q with Latin input", () => {
+		expect(
+			isTerminalReservedEvent(
+				makeKeyboardEvent({ code: "KeyQ", key: "q", ctrlKey: true }),
+			),
+		).toBe(true);
+	});
+
+	test("recognises Ctrl+Backslash with Latin input", () => {
+		expect(
+			isTerminalReservedEvent(
+				makeKeyboardEvent({
+					code: "Backslash",
+					key: "\\",
+					ctrlKey: true,
+				}),
+			),
+		).toBe(true);
+	});
+
+	// Reproduction for #3365: Korean IME transforms event.key to Hangul
+	test("recognises Ctrl+D under Korean IME (event.key = ㅇ)", () => {
+		expect(
+			isTerminalReservedEvent(
+				makeKeyboardEvent({ code: "KeyD", key: "ㅇ", ctrlKey: true }),
+			),
+		).toBe(true);
+	});
+
+	test("recognises Ctrl+C under Korean IME (event.key = ㅊ)", () => {
+		expect(
+			isTerminalReservedEvent(
+				makeKeyboardEvent({ code: "KeyC", key: "ㅊ", ctrlKey: true }),
+			),
+		).toBe(true);
+	});
+
+	test("recognises Ctrl+Z under Korean IME (event.key = ㅋ)", () => {
+		expect(
+			isTerminalReservedEvent(
+				makeKeyboardEvent({ code: "KeyZ", key: "ㅋ", ctrlKey: true }),
+			),
+		).toBe(true);
+	});
+
+	// Non-reserved chords should not match
+	test("rejects Ctrl+A (not reserved)", () => {
+		expect(
+			isTerminalReservedEvent(
+				makeKeyboardEvent({ code: "KeyA", key: "a", ctrlKey: true }),
+			),
+		).toBe(false);
+	});
+
+	// Modifier combinations that should not match
+	test("rejects Ctrl+Meta+C", () => {
+		expect(
+			isTerminalReservedEvent(
+				makeKeyboardEvent({
+					code: "KeyC",
+					key: "c",
+					ctrlKey: true,
+					metaKey: true,
+				}),
+			),
+		).toBe(false);
+	});
+
+	test("rejects C without Ctrl", () => {
+		expect(
+			isTerminalReservedEvent(
+				makeKeyboardEvent({ code: "KeyC", key: "c", ctrlKey: false }),
+			),
+		).toBe(false);
+	});
+});
diff --git a/apps/desktop/src/renderer/hotkeys/utils/utils.ts b/apps/desktop/src/renderer/hotkeys/utils/utils.ts
index effddc7c255..58de69ba8fa 100644
--- a/apps/desktop/src/renderer/hotkeys/utils/utils.ts
+++ b/apps/desktop/src/renderer/hotkeys/utils/utils.ts
@@ -5,12 +5,12 @@ const TERMINAL_RESERVED = new Set([
 	"ctrl+z",
 	"ctrl+s",
 	"ctrl+q",
-	"ctrl+\\",
+	"ctrl+backslash",
 ]);
 
 export function isTerminalReservedEvent(event: KeyboardEvent): boolean {
 	if (!event.ctrlKey || event.metaKey || event.altKey || event.shiftKey)
 		return false;
-	const key = event.key.toLowerCase();
+	const key = event.code.replace(/^Key/, "").toLowerCase();
 	return TERMINAL_RESERVED.has(`ctrl+${key}`);
 }