diff --git a/apps/german-app/src/components/GermanSpeechInterface.vue b/apps/german-app/src/components/GermanSpeechInterface.vue
index c3812b3..fc5e1fb 100644
--- a/apps/german-app/src/components/GermanSpeechInterface.vue
+++ b/apps/german-app/src/components/GermanSpeechInterface.vue
@@ -499,7 +499,7 @@ export default {
         id: this.messageId++,
         type,
         text,
-        audio: audio ? `data:audio/mp3;base64,${audio}` : null,
+        audio: audio ? `data:audio/wav;base64,${audio}` : null,
         timestamp: new Date(),
         showTranslation: false,
         loadingTranslation: false,
diff --git a/apps/indonesian-app/src/components/SpeechInterface.vue b/apps/indonesian-app/src/components/SpeechInterface.vue
index c894cfb..5594efe 100644
--- a/apps/indonesian-app/src/components/SpeechInterface.vue
+++ b/apps/indonesian-app/src/components/SpeechInterface.vue
@@ -500,7 +500,7 @@ export default {
         id: this.messageId++,
         type,
         text,
-        audio: audio ? `data:audio/mp3;base64,${audio}` : null,
+        audio: audio ? `data:audio/wav;base64,${audio}` : null,
         timestamp: new Date(),
         // Translation properties for AI messages
         showTranslation: false,
diff --git a/backend/core/speech_service.py b/backend/core/speech_service.py
index 1f65818..e9b6821 100644
--- a/backend/core/speech_service.py
+++ b/backend/core/speech_service.py
@@ -108,8 +108,9 @@ class TextToSpeechService:
         )
         
         audio_config_params = {
-            "audio_encoding": texttospeech.AudioEncoding.MP3,  # MP3 for faster processing
+            "audio_encoding": texttospeech.AudioEncoding.LINEAR16,  # WAV for better browser compatibility
             "speaking_rate": config_set["speaking_rate"],
+            "sample_rate_hertz": 24000,  # Required for LINEAR16
             # Remove effects profile for faster generation
         }
         
@@ -353,7 +354,7 @@ class BaseConversationFlowService:
                 "type": "ai_response",
                 "text": greeting,
                 "audio": audio_base64,
-                "audio_format": "mp3",
+                "audio_format": "wav",
                 "character": personality_name,
                 "is_initial_greeting": True
             }
@@ -395,7 +396,7 @@ class BaseConversationFlowService:
                 "type": "ai_response",
                 "text": ai_response,
                 "audio": audio_base64,
-                "audio_format": "mp3",
+                "audio_format": "wav",
                 "character": personality_name,
                 "goal_status": goal_status,
                 "conversation_complete": goal_status.get("all_completed", False)
@@ -427,7 +428,7 @@ class BaseConversationFlowService:
                 "type": "ai_response",
                 "text": ai_response,
                 "audio": audio_base64,
-                "audio_format": "mp3",
+                "audio_format": "wav",
                 "character": personality_name,
                 "goal_status": goal_status,
                 "conversation_complete": goal_status.get("all_completed", False)