diff --git a/platform/javascript/godot_js.h b/platform/javascript/godot_js.h
index 3a41f63fa39..b7b0aabaa4c 100644
--- a/platform/javascript/godot_js.h
+++ b/platform/javascript/godot_js.h
@@ -60,6 +60,12 @@ extern void godot_js_input_touch_cb(void (*p_callback)(int p_type, int p_count),
 extern void godot_js_input_key_cb(void (*p_callback)(int p_type, int p_repeat, int p_modifiers), char r_code[32], char r_key[32]);
 extern void godot_js_input_vibrate_handheld(int p_duration_ms);
 
+// IME
+extern void godot_js_set_ime_active(int p_active);
+extern void godot_js_set_ime_position(int p_x, int p_y);
+extern void godot_js_set_ime_cb(void (*p_input)(int p_type, const char *p_text), void (*p_callback)(int p_type, int p_repeat, int p_modifiers), char r_code[32], char r_key[32]);
+extern int godot_js_is_ime_focused();
+
 // Input gamepad
 extern void godot_js_input_gamepad_cb(void (*p_on_change)(int p_index, int p_connected, const char *p_id, const char *p_guid));
 extern int godot_js_input_gamepad_sample();
diff --git a/platform/javascript/js/libs/library_godot_input.js b/platform/javascript/js/libs/library_godot_input.js
index 1b221e78b37..cd460482460 100644
--- a/platform/javascript/js/libs/library_godot_input.js
+++ b/platform/javascript/js/libs/library_godot_input.js
@@ -28,6 +28,119 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
 /**************************************************************************/
 
+/*
+ * IME API helper.
+ */
+
+const GodotIME = {
+	$GodotIME__deps: ['$GodotRuntime', '$GodotEventListeners'],
+	$GodotIME__postset: 'GodotOS.atexit(function(resolve, reject) { GodotIME.clear(); resolve(); });',
+	$GodotIME: {
+		ime: null,
+		active: false,
+
+		getModifiers: function (evt) {
+			return (evt.shiftKey + 0) + ((evt.altKey + 0) << 1) + ((evt.ctrlKey + 0) << 2) + ((evt.metaKey + 0) << 3);
+		},
+
+		ime_active: function (active) {
+			function focus_timer() {
+				GodotIME.active = true;
+				GodotIME.ime.focus();
+			}
+
+			if (GodotIME.ime) {
+				if (active) {
+					GodotIME.ime.style.display = 'block';
+					setInterval(focus_timer, 100);
+				} else {
+					GodotIME.ime.style.display = 'none';
+					GodotConfig.canvas.focus();
+					GodotIME.active = false;
+				}
+			}
+		},
+
+		ime_position: function (x, y) {
+			if (GodotIME.ime) {
+				const canvas = GodotConfig.canvas;
+				const rect = canvas.getBoundingClientRect();
+				const rw = canvas.width / rect.width;
+				const rh = canvas.height / rect.height;
+				const clx = (x / rw) + rect.x;
+				const cly = (y / rh) + rect.y;
+
+				GodotIME.ime.style.left = `${clx}px`;
+				GodotIME.ime.style.top = `${cly}px`;
+			}
+		},
+
+		init: function (ime_cb, key_cb, code, key) {
+			function key_event_cb(pressed, evt) {
+				const modifiers = GodotIME.getModifiers(evt);
+				GodotRuntime.stringToHeap(evt.code, code, 32);
+				GodotRuntime.stringToHeap(evt.key, key, 32);
+				key_cb(pressed, evt.repeat, modifiers);
+				evt.preventDefault();
+			}
+			function ime_event_cb(event) {
+				if (GodotIME.ime) {
+					if (event.type === 'compositionstart') {
+						ime_cb(0, null);
+						GodotIME.ime.innerHTML = '';
+					} else if (event.type === 'compositionupdate') {
+						const ptr = GodotRuntime.allocString(event.data);
+						ime_cb(1, ptr);
+						GodotRuntime.free(ptr);
+					} else if (event.type === 'compositionend') {
+						const ptr = GodotRuntime.allocString(event.data);
+						ime_cb(2, ptr);
+						GodotRuntime.free(ptr);
+						GodotIME.ime.innerHTML = '';
+					}
+				}
+			}
+
+			const ime = document.createElement('div');
+			ime.className = 'ime';
+			ime.style.background = 'none';
+			ime.style.opacity = 0.0;
+			ime.style.position = 'fixed';
+			ime.style.textAlign = 'left';
+			ime.style.fontSize = '1px';
+			ime.style.left = '0px';
+			ime.style.top = '0px';
+			ime.style.width = '100%';
+			ime.style.height = '40px';
+			ime.style.display = 'none';
+			ime.contentEditable = 'true';
+
+			GodotEventListeners.add(ime, 'compositionstart', ime_event_cb, false);
+			GodotEventListeners.add(ime, 'compositionupdate', ime_event_cb, false);
+			GodotEventListeners.add(ime, 'compositionend', ime_event_cb, false);
+			GodotEventListeners.add(ime, 'keydown', key_event_cb.bind(null, 1), false);
+			GodotEventListeners.add(ime, 'keyup', key_event_cb.bind(null, 0), false);
+
+			ime.onblur = function () {
+				this.style.display = 'none';
+				GodotConfig.canvas.focus();
+				GodotIME.active = false;
+			};
+
+			GodotConfig.canvas.parentElement.appendChild(ime);
+			GodotIME.ime = ime;
+		},
+
+		clear: function () {
+			if (GodotIME.ime) {
+				GodotIME.ime.remove();
+				GodotIME.ime = null;
+			}
+		},
+	},
+};
+mergeInto(LibraryManager.library, GodotIME);
+
 /*
  * Gamepad API helper.
  */
@@ -338,7 +451,7 @@ mergeInto(LibraryManager.library, GodotInputDragDrop);
  * Godot exposed input functions.
  */
 const GodotInput = {
-	$GodotInput__deps: ['$GodotRuntime', '$GodotConfig', '$GodotEventListeners', '$GodotInputGamepads', '$GodotInputDragDrop'],
+	$GodotInput__deps: ['$GodotRuntime', '$GodotConfig', '$GodotEventListeners', '$GodotInputGamepads', '$GodotInputDragDrop', '$GodotIME'],
 	$GodotInput: {
 		getModifiers: function (evt) {
 			return (evt.shiftKey + 0) + ((evt.altKey + 0) << 1) + ((evt.ctrlKey + 0) << 2) + ((evt.metaKey + 0) << 3);
@@ -456,6 +569,35 @@ const GodotInput = {
 		GodotEventListeners.add(GodotConfig.canvas, 'keyup', key_cb.bind(null, 0), false);
 	},
 
+	/*
+	 * IME API
+	 */
+	godot_js_set_ime_active__proxy: 'sync',
+	godot_js_set_ime_active__sig: 'vi',
+	godot_js_set_ime_active: function (p_active) {
+		GodotIME.ime_active(p_active);
+	},
+
+	godot_js_set_ime_position__proxy: 'sync',
+	godot_js_set_ime_position__sig: 'vii',
+	godot_js_set_ime_position: function (p_x, p_y) {
+		GodotIME.ime_position(p_x, p_y);
+	},
+
+	godot_js_set_ime_cb__proxy: 'sync',
+	godot_js_set_ime_cb__sig: 'viiii',
+	godot_js_set_ime_cb: function (p_ime_cb, p_key_cb, code, key) {
+		const ime_cb = GodotRuntime.get_func(p_ime_cb);
+		const key_cb = GodotRuntime.get_func(p_key_cb);
+		GodotIME.init(ime_cb, key_cb, code, key);
+	},
+
+	godot_js_is_ime_focused__proxy: 'sync',
+	godot_js_is_ime_focused__sig: 'i',
+	godot_js_is_ime_focused: function () {
+		return GodotIME.active;
+	},
+
 	/*
 	 * Gamepad API
 	 */
diff --git a/platform/javascript/os_javascript.cpp b/platform/javascript/os_javascript.cpp
index e3db424bb0a..7bf0fac3b19 100644
--- a/platform/javascript/os_javascript.cpp
+++ b/platform/javascript/os_javascript.cpp
@@ -177,6 +177,9 @@ void OS_JavaScript::send_notification_callback(int p_notification) {
 	if (p_notification == MainLoop::NOTIFICATION_WM_MOUSE_ENTER || p_notification == MainLoop::NOTIFICATION_WM_MOUSE_EXIT) {
 		os->cursor_inside_canvas = p_notification == MainLoop::NOTIFICATION_WM_MOUSE_ENTER;
 	}
+	if (godot_js_is_ime_focused() && (p_notification == MainLoop::NOTIFICATION_WM_FOCUS_IN || p_notification == MainLoop::NOTIFICATION_WM_FOCUS_OUT)) {
+		return;
+	}
 	MainLoop *loop = os->get_main_loop();
 	if (loop) {
 		loop->notification(p_notification);
@@ -283,22 +286,39 @@ static void dom2godot_mod(Ref<InputEventWithModifiers> ev, int p_mod) {
 void OS_JavaScript::key_callback(int p_pressed, int p_repeat, int p_modifiers) {
 	OS_JavaScript *os = get_singleton();
 	JSKeyEvent &key_event = os->key_event;
+
+	const String code = String::utf8(key_event.code);
+	const String key = String::utf8(key_event.key);
+
 	// Resume audio context after input in case autoplay was denied.
 	os->resume_audio();
 
-	Ref<InputEventKey> ev;
-	ev.instance();
-	ev->set_echo(p_repeat);
-	ev->set_scancode(dom_code2godot_scancode(key_event.code, key_event.key, false));
-	ev->set_physical_scancode(dom_code2godot_scancode(key_event.code, key_event.key, true));
-	ev->set_pressed(p_pressed);
-	dom2godot_mod(ev, p_modifiers);
-
-	String unicode = String::utf8(key_event.key);
-	if (unicode.length() == 1) {
-		ev->set_unicode(unicode[0]);
+	if (os->ime_started) {
+		return;
 	}
-	os->input->parse_input_event(ev);
+
+	wchar_t c = 0x00;
+	String unicode = key;
+	if (unicode.length() == 1) {
+		c = unicode[0];
+	}
+	uint32_t keycode = dom_code2godot_scancode(code.utf8().get_data(), key.utf8().get_data(), false);
+	uint32_t scancode = dom_code2godot_scancode(code.utf8().get_data(), key.utf8().get_data(), true);
+
+	OS_JavaScript::KeyEvent ke;
+
+	ke.pressed = p_pressed;
+	ke.echo = p_repeat;
+	ke.raw = true;
+	ke.keycode = keycode;
+	ke.physical_keycode = scancode;
+	ke.unicode = c;
+	ke.mod = p_modifiers;
+
+	if (os->key_event_pos >= os->key_event_buffer.size()) {
+		os->key_event_buffer.resize(1 + os->key_event_pos);
+	}
+	os->key_event_buffer.write[os->key_event_pos++] = ke;
 
 	// Make sure to flush all events so we can call restricted APIs inside the event.
 	os->input->flush_buffered_events();
@@ -579,7 +599,7 @@ OS::MouseMode OS_JavaScript::get_mouse_mode() const {
 int OS_JavaScript::mouse_wheel_callback(double p_delta_x, double p_delta_y) {
 	OS_JavaScript *os = get_singleton();
 
-	if (!godot_js_display_canvas_is_focused()) {
+	if (!godot_js_display_canvas_is_focused() && !godot_js_is_ime_focused()) {
 		if (os->cursor_inside_canvas) {
 			godot_js_display_canvas_focus();
 		} else {
@@ -670,6 +690,90 @@ void OS_JavaScript::touch_callback(int p_type, int p_count) {
 	}
 }
 
+// IME.
+void OS_JavaScript::ime_callback(int p_type, const char *p_text) {
+	OS_JavaScript *os = get_singleton();
+
+	// Resume audio context after input in case autoplay was denied.
+	os->resume_audio();
+
+	switch (p_type) {
+		case 0: {
+			// IME start.
+			os->ime_text = String();
+			os->ime_selection = Vector2i();
+			for (int i = os->key_event_pos - 1; i >= 0; i--) {
+				// Delete last raw keydown event from query.
+				if (os->key_event_buffer[i].pressed && os->key_event_buffer[i].raw) {
+					os->key_event_buffer.remove(i);
+					os->key_event_pos--;
+					break;
+				}
+			}
+			os->get_main_loop()->notification(MainLoop::NOTIFICATION_OS_IME_UPDATE);
+			os->ime_started = true;
+		} break;
+		case 1: {
+			// IME update.
+			if (os->ime_active && os->ime_started) {
+				os->ime_text = String::utf8(p_text);
+				os->ime_selection = Vector2i(os->ime_text.length(), os->ime_text.length());
+				os->get_main_loop()->notification(MainLoop::NOTIFICATION_OS_IME_UPDATE);
+			}
+		} break;
+		case 2: {
+			// IME commit.
+			if (os->ime_active && os->ime_started) {
+				os->ime_started = false;
+
+				os->ime_text = String();
+				os->ime_selection = Vector2i();
+				os->get_main_loop()->notification(MainLoop::NOTIFICATION_OS_IME_UPDATE);
+
+				String text = String::utf8(p_text);
+				for (int i = 0; i < text.length(); i++) {
+					OS_JavaScript::KeyEvent ke;
+
+					ke.pressed = true;
+					ke.echo = false;
+					ke.raw = false;
+					ke.keycode = 0;
+					ke.physical_keycode = 0;
+					ke.unicode = text[i];
+					ke.mod = 0;
+
+					if (os->key_event_pos >= os->key_event_buffer.size()) {
+						os->key_event_buffer.resize(1 + os->key_event_pos);
+					}
+					os->key_event_buffer.write[os->key_event_pos++] = ke;
+				}
+			}
+		} break;
+		default:
+			break;
+	}
+
+	os->process_keys();
+	os->input->flush_buffered_events();
+}
+
+void OS_JavaScript::set_ime_active(const bool p_active) {
+	ime_active = p_active;
+	godot_js_set_ime_active(p_active);
+}
+
+void OS_JavaScript::set_ime_position(const Point2 &p_pos) {
+	godot_js_set_ime_position(p_pos.x, p_pos.y);
+}
+
+Point2 OS_JavaScript::get_ime_selection() const {
+	return ime_selection;
+}
+
+String OS_JavaScript::get_ime_text() const {
+	return ime_text;
+}
+
 // Gamepad
 void OS_JavaScript::gamepad_callback(int p_index, int p_connected, const char *p_id, const char *p_guid) {
 	InputDefault *input = get_singleton()->input;
@@ -707,6 +811,26 @@ void OS_JavaScript::process_joypads() {
 	}
 }
 
+void OS_JavaScript::process_keys() {
+	for (int i = 0; i < key_event_pos; i++) {
+		const OS_JavaScript::KeyEvent &ke = key_event_buffer[i];
+
+		Ref<InputEventKey> ev;
+		ev.instance();
+		ev->set_pressed(ke.pressed);
+		ev->set_echo(ke.echo);
+		ev->set_scancode(ke.keycode);
+		ev->set_physical_scancode(ke.physical_keycode);
+		ev->set_unicode(ke.unicode);
+		if (ke.raw) {
+			dom2godot_mod(ev, ke.mod);
+		}
+
+		input->parse_input_event(ev);
+	}
+	key_event_pos = 0;
+}
+
 bool OS_JavaScript::is_joy_known(int p_device) {
 	return input->is_joy_mapped(p_device);
 }
@@ -859,6 +983,7 @@ Error OS_JavaScript::initialize(const VideoMode &p_desired, int p_video_driver,
 	godot_js_input_gamepad_cb(&OS_JavaScript::gamepad_callback);
 	godot_js_input_paste_cb(&OS_JavaScript::update_clipboard_callback);
 	godot_js_input_drop_files_cb(&OS_JavaScript::drop_files_callback);
+	godot_js_set_ime_cb(&OS_JavaScript::ime_callback, &OS_JavaScript::key_callback, key_event.code, key_event.key);
 
 	// JS Display interface (js/libs/library_godot_display.js)
 	godot_js_display_fullscreen_cb(&OS_JavaScript::fullscreen_change_callback);
@@ -940,8 +1065,8 @@ bool OS_JavaScript::main_loop_iterate() {
 		godot_js_os_fs_sync(&OS_JavaScript::fs_sync_callback);
 	}
 
+	process_keys();
 	input->flush_buffered_events();
-
 	if (godot_js_input_gamepad_sample() == OK) {
 		process_joypads();
 	}
diff --git a/platform/javascript/os_javascript.h b/platform/javascript/os_javascript.h
index 1d20367c90a..c7a7c69ac25 100644
--- a/platform/javascript/os_javascript.h
+++ b/platform/javascript/os_javascript.h
@@ -54,6 +54,24 @@ private:
 	};
 	JSKeyEvent key_event;
 
+	bool ime_active = false;
+	bool ime_started = false;
+	String ime_text;
+	Vector2 ime_selection;
+
+	struct KeyEvent {
+		bool pressed = false;
+		bool echo = false;
+		bool raw = false;
+		uint32_t keycode = 0;
+		uint32_t physical_keycode = 0;
+		uint32_t unicode = 0;
+		int mod = 0;
+	};
+
+	Vector<KeyEvent> key_event_buffer;
+	int key_event_pos = 0;
+
 	VideoMode video_mode;
 	bool transparency_enabled;
 
@@ -94,6 +112,7 @@ private:
 	static void gamepad_callback(int p_index, int p_connected, const char *p_id, const char *p_guid);
 	static void input_text_callback(const char *p_text, int p_cursor);
 	void process_joypads();
+	void process_keys();
 
 	static void file_access_close_callback(const String &p_file, int p_flags);
 
@@ -105,6 +124,7 @@ private:
 	static void update_clipboard_callback(const char *p_text);
 	static void update_pwa_state_callback();
 	static void _js_utterance_callback(int p_event, int p_id, int p_pos);
+	static void ime_callback(int p_type, const char *p_text);
 	static void update_voices_callback(int p_size, const char **p_voice);
 
 protected:
@@ -161,6 +181,12 @@ public:
 	virtual float get_screen_scale(int p_screen = -1) const;
 	virtual float get_screen_max_scale() const;
 
+	virtual void set_ime_active(const bool p_active);
+	virtual void set_ime_position(const Point2 &p_pos);
+
+	virtual Point2 get_ime_selection() const;
+	virtual String get_ime_text() const;
+
 	virtual Point2 get_mouse_position() const;
 	virtual int get_mouse_button_state() const;
 	virtual void set_cursor_shape(CursorShape p_shape);