🗣️ Thai Text-to-Speech V2 (Kaitom Voice)

1 ICper 400 characters

v2.0 Active🎙️ Speech🆕 March 2025

Welcome to Thai Text-to-Speech API V2, featuring the improved Kaitom voice (น้องไข่ต้ม เวอร์ชั่น 2). This version offers enhanced naturalness and better Thai-English mixed language support through a POST-based API.

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API Key

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Endpoint URL

cURL Command

Sample Texts

Enter the desired text here.เสียงเด็กผู้ชายน้องไข่ต้ม เวอร์ชั่น 2

Language ModeTH (Thai only)TH_MIX_EN (Thai mixed with English)

Getting Started

1. Prerequisites

   • An API key from iApp Technology
   • Text input in Thai and/or English
   • Maximum text length: No specific limit
   • Supported output format: WAV

2. Quick Start

   • Fast processing (less than 1 second)
   • Improved natural speech generation
   • Enhanced Thai-English mixed text support

3. Key Features

   • Improved natural speech synthesis (V2 engine)
   • Superior mixed language support (Thai-English)
   • Language mode selection (TH or TH_MIX_EN)
   • Emoji support
   • Number, date, and currency value conversion
   • Fast processing time

4. Security & Compliance

   • GDPR and PDPA compliant
   • No data retention after processing

How to get API Key?

Please visit API Key Management page to view your existing API key or request a new one.

V1 Available

Looking for the legacy GET-based API with Kaitom V1 or Cee voice? See Text-to-Speech V1

API Endpoint

Endpoint	Method	Description	Cost
/v3/store/speech/text-to-speech/kaitom Legacy: /thai-tts-kaitom2/tts	POST	Thai TTS with Kaitom voice V2	1 IC per 400 characters

Quick Example

Sample Request

curl --location 'https://api.iapp.co.th/v3/store/speech/text-to-speech/kaitom' \
    --header 'apikey: YOUR_API_KEY' \
    --form 'text="สวัสดีครับ น้องไข่ต้ม มาแล้วฮะ"' \
    --form 'language="TH"'

Sample Response

Audio file output (WAV format). The output audio file can be previewed as below:

Thai Only:

Thai Mixed with English:

API Reference

Text-to-Speech V2 Endpoint

• Endpoint: POST https://api.iapp.co.th/v3/store/speech/text-to-speech/kaitom
• Required Parameters:
  • apikey: Your API key (header)
  • text: Text to convert to speech (form data)
• Optional Parameters:
  • language: Language mode (form data)
    • TH: Thai only (pure Thai text)
    • TH_MIX_EN: Thai mixed with English (default)

Code Examples

Python

import requests

url = "https://api.iapp.co.th/v3/store/speech/text-to-speech/kaitom"
headers = {"apikey": "YOUR_API_KEY"}
data = {
    "text": "สวัสดีครับ น้องไข่ต้ม มาแล้วฮะ",
    "language": "TH"
}

response = requests.post(url, headers=headers, data=data)
with open("output.wav", "wb") as f:
    f.write(response.content)

JavaScript (Node.js)

const axios = require("axios")
const fs = require("fs")
const FormData = require("form-data")

let formData = new FormData()
formData.append("text", "สวัสดีครับ น้องไข่ต้ม มาแล้วฮะ")
formData.append("language", "TH")

let config = {
    method: "post",
    url: "https://api.iapp.co.th/v3/store/speech/text-to-speech/kaitom",
    headers: {
        apikey: "YOUR_API_KEY",
        ...formData.getHeaders(),
    },
    data: formData,
    responseType: "arraybuffer",
}

axios(config)
    .then((response) => {
        fs.writeFileSync("output.wav", response.data)
    })
    .catch((error) => console.log(error))

PHP

<?php
$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://api.iapp.co.th/v3/store/speech/text-to-speech/kaitom',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_POSTFIELDS => array(
    'text' => 'สวัสดีครับ น้องไข่ต้ม มาแล้วฮะ',
    'language' => 'TH'
  ),
  CURLOPT_HTTPHEADER => array(
    'apikey: YOUR_API_KEY'
  ),
));

$response = curl_exec($curl);
curl_close($curl);

file_put_contents("output.wav", $response);
?>

Swift

let parameters = [
  [
    "key": "language",
    "value": "TH",
    "type": "text"
  ],
  [
    "key": "text",
    "value": "สวัสดีครับ น้องไข่ต้ม มาแล้วฮะ",
    "type": "text"
  ]] as [[String: Any]]

let boundary = "Boundary-\(UUID().uuidString)"
var body = Data()
var error: Error? = nil
for param in parameters {
  if param["disabled"] != nil { continue }
  let paramName = param["key"]!
  body += Data("--\(boundary)\r\n".utf8)
  body += Data("Content-Disposition:form-data; name=\"\(paramName)\"".utf8)
  if param["contentType"] != nil {
    body += Data("\r\nContent-Type: \(param["contentType"] as! String)".utf8)
  }
  let paramType = param["type"] as! String
  if paramType == "text" {
    let paramValue = param["value"] as! String
    body += Data("\r\n\r\n\(paramValue)\r\n".utf8)
  } else {
    let paramSrc = param["src"] as! String
    let fileURL = URL(fileURLWithPath: paramSrc)
    if let fileContent = try? Data(contentsOf: fileURL) {
      body += Data("; filename=\"\(paramSrc)\"\r\n".utf8)
      body += Data("Content-Type: \"content-type header\"\r\n".utf8)
      body += Data("\r\n".utf8)
      body += fileContent
      body += Data("\r\n".utf8)
    }
  }
}
body += Data("--\(boundary)--\r\n".utf8);
let postData = body


var request = URLRequest(url: URL(string: "https://api.iapp.co.th/v3/store/speech/text-to-speech/kaitom")!,timeoutInterval: Double.infinity)
request.addValue("YOUR_API_KEY", forHTTPHeaderField: "apikey")
request.addValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")

request.httpMethod = "POST"
request.httpBody = postData

let task = URLSession.shared.dataTask(with: request) { data, response, error in
  guard let data = data else {
    print(String(describing: error))
    return
  }
  print(String(data: data, encoding: .utf8)!)
}

task.resume()

Kotlin

val client = OkHttpClient()
val mediaType = "text/plain".toMediaType()
val body = MultipartBody.Builder().setType(MultipartBody.FORM)
  .addFormDataPart("language","TH")
  .addFormDataPart("text","สวัสดีครับ น้องไข่ต้ม มาแล้วฮะ")
  .build()
val request = Request.Builder()
  .url("https://api.iapp.co.th/v3/store/speech/text-to-speech/kaitom")
  .post(body)
  .addHeader("apikey", "YOUR_API_KEY")
  .build()
val response = client.newCall(request).execute()

Java

OkHttpClient client = new OkHttpClient().newBuilder()
  .build();
MediaType mediaType = MediaType.parse("text/plain");
RequestBody body = new MultipartBody.Builder().setType(MultipartBody.FORM)
  .addFormDataPart("language","TH")
  .addFormDataPart("text","สวัสดีครับ น้องไข่ต้ม มาแล้วฮะ")
  .build();
Request request = new Request.Builder()
  .url("https://api.iapp.co.th/v3/store/speech/text-to-speech/kaitom")
  .method("POST", body)
  .addHeader("apikey", "YOUR_API_KEY")
  .build();
Response response = client.newCall(request).execute();

Dart

var headers = {
  'apikey': 'YOUR_API_KEY'
};
var data = FormData.fromMap({
  'language': 'TH',
  'text': 'สวัสดีครับ น้องไข่ต้ม มาแล้วฮะ'
});

var dio = Dio();
var response = await dio.request(
  'https://uat-api.iapp.co.th/v3/store/speech/text-to-speech/kaitom',
  options: Options(
    method: 'POST',
    headers: headers,
  ),
  data: data,
);

if (response.statusCode == 200) {
  print(json.encode(response.data));
}
else {
  print(response.statusMessage);
}

Features & Capabilities

Core Features

• Improved natural speech generation (V2 engine)
• Superior mixed Thai-English text support
• Language mode selection
• Emoji conversion
• Number and date formatting
• Fast processing

Language Modes

• TH (Thai Only): Pure Thai text processing for optimal Thai pronunciation
• TH_MIX_EN (Default): Mixed Thai-English support for bilingual content

Limitations and Best Practices

Limitations

• Thai and English language support only
• Single voice option: Kaitom V2 (male voice)
• Only speaker_id 0 is supported
• Output format: WAV only

Best Practices

• Use proper punctuation for natural pauses
• Choose appropriate language mode:
  • Use TH for pure Thai text
  • Use TH_MIX_EN for mixed Thai-English content
• Keep sentences natural and conversational
• Test with small text segments first

Accuracy & Performance

Overall Accuracy

• Enhanced natural speech quality (V2 engine)
• Improved pronunciation for both Thai and English
• Better handling of mixed language content
• Proper handling of numbers and special characters

Processing Speed

• Less than 1 second per request
• Consistent performance regardless of text length

What's New in V2

Improvements over V1

• ✨ Enhanced speech naturalness
• 🗣️ Better Thai-English mixed language support
• 🎵 Improved pronunciation accuracy
• ⚡ Same fast processing speed
• 📊 Language mode selection for optimized output

Migration from V1

If you're using V1, here are the key changes:

Aspect	V1 (GET)	V2 (POST)
Method	GET	POST
Text Parameter	Query parameter	Form data
Language Mode	Not available	TH or TH_MIX_EN
Output Format	MP3	WAV
Endpoint	/kaitom/v1	/kaitom

Pricing

AI API Service Name	Endpoint	IC Per Characters	On-Premise
Thai Text To Speech V2 (TTS)	iapp_text_to_speech_v2_kaitom	1 IC/400 Characters	Contact

See Also

• Text-to-Speech V1 - Legacy GET-based API with Kaitom V1 and Cee voice
• Speech-to-Text - Convert speech to text