diff --git a/AVAILABLE_VOICES.md b/AVAILABLE_VOICES.md
new file mode 100644
index 0000000..8310e57
--- /dev/null
+++ b/AVAILABLE_VOICES.md
@@ -0,0 +1,157 @@
+# Available Kokoro TTS Voices
+
+Kokoro-82M has **54 voices** available across multiple languages!
+
+## Voice Naming Convention
+- **First letter**: Language code
+  - `a` = American English
+  - `b` = British English
+  - `e` = Spanish (español)
+  - `f` = French
+  - `h` = Hindi
+  - `i` = Italian
+  - `j` = Japanese
+  - `p` = Portuguese
+  - `z` = Chinese (Mandarin)
+- **Second letter**: Gender
+  - `f` = Female
+  - `m` = Male
+- **Rest**: Voice name/identifier
+
+## American English (a) - 21 voices
+
+### Female (af_*)
+- `af_alloy` - Alloy
+- `af_aoede` - Aoede
+- `af_bella` - Bella ✓ (currently in app)
+- `af_heart` - Heart
+- `af_jessica` - Jessica
+- `af_kore` - Kore
+- `af_nicole` - Nicole
+- `af_nova` - Nova
+- `af_river` - River
+- `af_sarah` - Sarah ✓ (currently in app)
+- `af_sky` - Sky
+
+### Male (am_*)
+- `am_adam` - Adam ✓ (currently in app)
+- `am_echo` - Echo
+- `am_eric` - Eric
+- `am_fenrir` - Fenrir
+- `am_liam` - Liam
+- `am_michael` - Michael ✓ (currently in app)
+- `am_onyx` - Onyx
+- `am_puck` - Puck
+- `am_santa` - Santa
+
+## British English (b) - 8 voices
+
+### Female (bf_*)
+- `bf_alice` - Alice
+- `bf_emma` - Emma ✓ (currently in app)
+- `bf_isabella` - Isabella ✓ (currently in app)
+- `bf_lily` - Lily
+
+### Male (bm_*)
+- `bm_daniel` - Daniel
+- `bm_fable` - Fable
+- `bm_george` - George ✓ (currently in app)
+- `bm_lewis` - Lewis ✓ (currently in app)
+
+## Spanish (e) - 3 voices
+
+### Female (ef_*)
+- `ef_dora` - Dora
+
+### Male (em_*)
+- `em_alex` - Alex
+- `em_santa` - Santa
+
+## French (f) - 1 voice
+
+### Female (ff_*)
+- `ff_siwis` - Siwis
+
+## Hindi (h) - 4 voices
+
+### Female (hf_*)
+- `hf_alpha` - Alpha
+- `hf_beta` - Beta
+
+### Male (hm_*)
+- `hm_omega` - Omega
+- `hm_psi` - Psi
+
+## Italian (i) - 2 voices
+
+### Female (if_*)
+- `if_sara` - Sara
+
+### Male (im_*)
+- `im_nicola` - Nicola
+
+## Japanese (j) - 5 voices
+
+### Female (jf_*)
+- `jf_alpha` - Alpha
+- `jf_gongitsune` - Gongitsune
+- `jf_nezumi` - Nezumi
+- `jf_tebukuro` - Tebukuro
+
+### Male (jm_*)
+- `jm_kumo` - Kumo
+
+## Portuguese (p) - 3 voices
+
+### Female (pf_*)
+- `pf_dora` - Dora
+
+### Male (pm_*)
+- `pm_alex` - Alex
+- `pm_santa` - Santa
+
+## Chinese/Mandarin (z) - 7 voices
+
+### Female (zf_*)
+- `zf_xiaobei` - Xiaobei
+- `zf_xiaoni` - Xiaoni
+- `zf_xiaoxiao` - Xiaoxiao
+- `zf_xiaoyi` - Xiaoyi
+
+### Male (zm_*)
+- `zm_yunjian` - Yunjian
+- `zm_yunxi` - Yunxi
+- `zm_yunxia` - Yunxia
+- `zm_yunyang` - Yunyang
+
+## Summary
+
+| Language | Female Voices | Male Voices | Total |
+|----------|--------------|-------------|-------|
+| American English | 11 | 10 | 21 |
+| British English | 4 | 4 | 8 |
+| Spanish | 1 | 2 | 3 |
+| French | 1 | 0 | 1 |
+| Hindi | 2 | 2 | 4 |
+| Italian | 1 | 1 | 2 |
+| Japanese | 4 | 1 | 5 |
+| Portuguese | 1 | 2 | 3 |
+| Chinese | 4 | 4 | 8 |
+| **TOTAL** | **29** | **26** | **55** |
+
+## Currently Configured (8 voices)
+
+The app currently uses only 8 voices:
+- ✓ af_bella, af_sarah (American Female)
+- ✓ am_adam, am_michael (American Male)
+- ✓ bf_emma, bf_isabella (British Female)
+- ✓ bm_george, bm_lewis (British Male)
+
+## Recommendation
+
+You could expand the voice options to include:
+1. **More variety in American English** (11 female + 10 male available!)
+2. **Additional languages** (Spanish, French, Italian, Japanese, Portuguese, Chinese, Hindi)
+3. **More character variety** (different voice characteristics)
+
+Would you like me to update the frontend to include more voices?
diff --git a/backend/main.py b/backend/main.py
index bc1c11a..21a6bb9 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -165,7 +165,7 @@ async def generate_audiobook(request: TTSRequest):
         )
     
     # Validate language code
-    supported_langs = ['a', 'b', 'f', 'j']
+    supported_langs = ['a', 'b', 'e', 'f', 'h', 'i', 'j', 'p', 'z']
     if request.lang not in supported_langs:
         logger.error(f"Invalid language code: {request.lang}")
         return JSONResponse(
diff --git a/backend/services/tts_service.py b/backend/services/tts_service.py
index 527067c..057f1b7 100644
--- a/backend/services/tts_service.py
+++ b/backend/services/tts_service.py
@@ -43,7 +43,7 @@ class TTSService:
         Caches pipelines to avoid reloading.
         
         Args:
-            lang_code: Language code (a, b, f, j)
+            lang_code: Language code (a, b, e, f, h, i, j, p, z)
             
         Returns:
             KPipeline instance for the language
@@ -51,7 +51,7 @@ class TTSService:
         Raises:
             ValueError: If language code is not supported
         """
-        supported_langs = ['a', 'b', 'f', 'j']
+        supported_langs = ['a', 'b', 'e', 'f', 'h', 'i', 'j', 'p', 'z']
         if lang_code not in supported_langs:
             raise ValueError(
                 f"Unsupported language code: {lang_code}. "
diff --git a/frontend/src/components/VoiceAssignmentSection.tsx b/frontend/src/components/VoiceAssignmentSection.tsx
index 329ab93..d75b710 100644
--- a/frontend/src/components/VoiceAssignmentSection.tsx
+++ b/frontend/src/components/VoiceAssignmentSection.tsx
@@ -25,24 +25,108 @@ interface LanguageOption {
   label: string;
 }
 
-// Kokoro voice options as defined in the design document
+// All available Kokoro voice options (54 voices across 9 languages)
 const KOKORO_VOICES: VoiceOption[] = [
+  // American English - Female (11 voices)
+  { id: 'af_alloy', label: 'Alloy (Female, American)', gender: 'female', accent: 'American' },
+  { id: 'af_aoede', label: 'Aoede (Female, American)', gender: 'female', accent: 'American' },
   { id: 'af_bella', label: 'Bella (Female, American)', gender: 'female', accent: 'American' },
+  { id: 'af_heart', label: 'Heart (Female, American)', gender: 'female', accent: 'American' },
+  { id: 'af_jessica', label: 'Jessica (Female, American)', gender: 'female', accent: 'American' },
+  { id: 'af_kore', label: 'Kore (Female, American)', gender: 'female', accent: 'American' },
+  { id: 'af_nicole', label: 'Nicole (Female, American)', gender: 'female', accent: 'American' },
+  { id: 'af_nova', label: 'Nova (Female, American)', gender: 'female', accent: 'American' },
+  { id: 'af_river', label: 'River (Female, American)', gender: 'female', accent: 'American' },
   { id: 'af_sarah', label: 'Sarah (Female, American)', gender: 'female', accent: 'American' },
+  { id: 'af_sky', label: 'Sky (Female, American)', gender: 'female', accent: 'American' },
+  
+  // American English - Male (10 voices)
   { id: 'am_adam', label: 'Adam (Male, American)', gender: 'male', accent: 'American' },
+  { id: 'am_echo', label: 'Echo (Male, American)', gender: 'male', accent: 'American' },
+  { id: 'am_eric', label: 'Eric (Male, American)', gender: 'male', accent: 'American' },
+  { id: 'am_fenrir', label: 'Fenrir (Male, American)', gender: 'male', accent: 'American' },
+  { id: 'am_liam', label: 'Liam (Male, American)', gender: 'male', accent: 'American' },
   { id: 'am_michael', label: 'Michael (Male, American)', gender: 'male', accent: 'American' },
+  { id: 'am_onyx', label: 'Onyx (Male, American)', gender: 'male', accent: 'American' },
+  { id: 'am_puck', label: 'Puck (Male, American)', gender: 'male', accent: 'American' },
+  { id: 'am_santa', label: 'Santa (Male, American)', gender: 'male', accent: 'American' },
+  
+  // British English - Female (4 voices)
+  { id: 'bf_alice', label: 'Alice (Female, British)', gender: 'female', accent: 'British' },
   { id: 'bf_emma', label: 'Emma (Female, British)', gender: 'female', accent: 'British' },
   { id: 'bf_isabella', label: 'Isabella (Female, British)', gender: 'female', accent: 'British' },
+  { id: 'bf_lily', label: 'Lily (Female, British)', gender: 'female', accent: 'British' },
+  
+  // British English - Male (4 voices)
+  { id: 'bm_daniel', label: 'Daniel (Male, British)', gender: 'male', accent: 'British' },
+  { id: 'bm_fable', label: 'Fable (Male, British)', gender: 'male', accent: 'British' },
   { id: 'bm_george', label: 'George (Male, British)', gender: 'male', accent: 'British' },
   { id: 'bm_lewis', label: 'Lewis (Male, British)', gender: 'male', accent: 'British' },
+  
+  // Spanish - Female (1 voice)
+  { id: 'ef_dora', label: 'Dora (Female, Spanish)', gender: 'female', accent: 'Spanish' },
+  
+  // Spanish - Male (2 voices)
+  { id: 'em_alex', label: 'Alex (Male, Spanish)', gender: 'male', accent: 'Spanish' },
+  { id: 'em_santa', label: 'Santa (Male, Spanish)', gender: 'male', accent: 'Spanish' },
+  
+  // French - Female (1 voice)
+  { id: 'ff_siwis', label: 'Siwis (Female, French)', gender: 'female', accent: 'French' },
+  
+  // Hindi - Female (2 voices)
+  { id: 'hf_alpha', label: 'Alpha (Female, Hindi)', gender: 'female', accent: 'Hindi' },
+  { id: 'hf_beta', label: 'Beta (Female, Hindi)', gender: 'female', accent: 'Hindi' },
+  
+  // Hindi - Male (2 voices)
+  { id: 'hm_omega', label: 'Omega (Male, Hindi)', gender: 'male', accent: 'Hindi' },
+  { id: 'hm_psi', label: 'Psi (Male, Hindi)', gender: 'male', accent: 'Hindi' },
+  
+  // Italian - Female (1 voice)
+  { id: 'if_sara', label: 'Sara (Female, Italian)', gender: 'female', accent: 'Italian' },
+  
+  // Italian - Male (1 voice)
+  { id: 'im_nicola', label: 'Nicola (Male, Italian)', gender: 'male', accent: 'Italian' },
+  
+  // Japanese - Female (4 voices)
+  { id: 'jf_alpha', label: 'Alpha (Female, Japanese)', gender: 'female', accent: 'Japanese' },
+  { id: 'jf_gongitsune', label: 'Gongitsune (Female, Japanese)', gender: 'female', accent: 'Japanese' },
+  { id: 'jf_nezumi', label: 'Nezumi (Female, Japanese)', gender: 'female', accent: 'Japanese' },
+  { id: 'jf_tebukuro', label: 'Tebukuro (Female, Japanese)', gender: 'female', accent: 'Japanese' },
+  
+  // Japanese - Male (1 voice)
+  { id: 'jm_kumo', label: 'Kumo (Male, Japanese)', gender: 'male', accent: 'Japanese' },
+  
+  // Portuguese - Female (1 voice)
+  { id: 'pf_dora', label: 'Dora (Female, Portuguese)', gender: 'female', accent: 'Portuguese' },
+  
+  // Portuguese - Male (2 voices)
+  { id: 'pm_alex', label: 'Alex (Male, Portuguese)', gender: 'male', accent: 'Portuguese' },
+  { id: 'pm_santa', label: 'Santa (Male, Portuguese)', gender: 'male', accent: 'Portuguese' },
+  
+  // Chinese/Mandarin - Female (4 voices)
+  { id: 'zf_xiaobei', label: 'Xiaobei (Female, Chinese)', gender: 'female', accent: 'Chinese' },
+  { id: 'zf_xiaoni', label: 'Xiaoni (Female, Chinese)', gender: 'female', accent: 'Chinese' },
+  { id: 'zf_xiaoxiao', label: 'Xiaoxiao (Female, Chinese)', gender: 'female', accent: 'Chinese' },
+  { id: 'zf_xiaoyi', label: 'Xiaoyi (Female, Chinese)', gender: 'female', accent: 'Chinese' },
+  
+  // Chinese/Mandarin - Male (4 voices)
+  { id: 'zm_yunjian', label: 'Yunjian (Male, Chinese)', gender: 'male', accent: 'Chinese' },
+  { id: 'zm_yunxi', label: 'Yunxi (Male, Chinese)', gender: 'male', accent: 'Chinese' },
+  { id: 'zm_yunxia', label: 'Yunxia (Male, Chinese)', gender: 'male', accent: 'Chinese' },
+  { id: 'zm_yunyang', label: 'Yunyang (Male, Chinese)', gender: 'male', accent: 'Chinese' },
 ];
 
-// Language options as defined in the design document
+// Language options - all supported by Kokoro TTS
 const LANGUAGES: LanguageOption[] = [
   { code: 'a', label: 'American English' },
   { code: 'b', label: 'British English' },
-  { code: 'f', label: 'French' },
-  { code: 'j', label: 'Japanese' },
+  { code: 'e', label: 'Spanish (Español)' },
+  { code: 'f', label: 'French (Français)' },
+  { code: 'h', label: 'Hindi (हिन्दी)' },
+  { code: 'i', label: 'Italian (Italiano)' },
+  { code: 'j', label: 'Japanese (日本語)' },
+  { code: 'p', label: 'Portuguese (Português)' },
+  { code: 'z', label: 'Chinese (中文)' },
 ];
 
 export default function VoiceAssignmentSection({