diff --git a/README.md b/README.md
index a09afa5..fdad9c1 100644
--- a/README.md
+++ b/README.md
@@ -52,11 +52,12 @@ options argument is an optional object of following fields:
 
 ```javascript
 var options = {
-    width : 800,         //int, width of the writing area, default: undefined
-    height : 800,        //int, height of the writing area, default: undefined
-    language : "zh_TW",  //string, language of input trace, default: "zh_TW"
-    numOfWords : 1,      //int, number of words of input trace, default: undefined
-    numOfReturn : 5,     //int, number of maximum returned results, default: undefined
+    width : 800,                   //int, width of the writing area, default: undefined
+    height : 800,                  //int, height of the writing area, default: undefined
+    language : "zh_TW",            //string, language of input trace, default: "zh_TW"
+    serviceEndpoint: "google_tw",  //string, service endpoint URL used, default: "default"
+    numOfWords : 1,                //int, number of words of input trace, default: undefined
+    numOfReturn : 5,               //int, number of maximum returned results, default: undefined
 };
 ```
 
@@ -177,6 +178,18 @@ Note that, even included handwriting.canvas.js now, the previous way of calling
 
 so that you can take advantage of the **handwriting.canvas** object, while not changing previous code.
 
+---
+<h3 id="serviceEndpointUrl">Supported Service Endpoint URLs</h3>
+
+| code       | URL                                                                                         |
+|------------|---------------------------------------------------------------------------------------------|
+| default    | https://www.google.com.tw/inputtools/request?ime=handwriting&app=mobilesearch&cs=1&oe=UTF-8 |
+| google_tw  | https://www.google.com.tw/inputtools/request?ime=handwriting                                |
+| google_jp  | https://www.google.co.jp/inputtools/request?ime=handwriting                                 |
+| google_kr  | https://www.google.co.kr/inputtools/request?ime=handwriting                                 |
+| google     | https://www.google.com/inputtools/request?ime=handwriting                                   |
+| inputtools | https://inputtools.google.com/request?ime=handwriting                                       |
+
 ---
 <h3 id="language">Supported Language</h3>
    
diff --git a/handwriting.canvas.js b/handwriting.canvas.js
index 4890d3d..69f13ce 100644
--- a/handwriting.canvas.js
+++ b/handwriting.canvas.js
@@ -199,6 +199,14 @@
             options = this.options;
             callback = this.callback;
         } else if (!options) options = {};
+        var serviceEndpointURLs = {
+            "default": "https://www.google.com.tw/inputtools/request?ime=handwriting&app=mobilesearch&cs=1&oe=UTF-8",
+            "google_tw": "https://www.google.com.tw/inputtools/request?ime=handwriting",
+            "google_jp": "https://www.google.co.jp/inputtools/request?ime=handwriting",
+            "google_kr": "https://www.google.co.kr/inputtools/request?ime=handwriting",
+            "google": "https://www.google.com/inputtools/request?ime=handwriting",
+            "inputtools": "https://inputtools.google.com/request?ime=handwriting"
+        }
         var data = JSON.stringify({
             "options": "enable_pre_space",
             "requests": [{
@@ -240,7 +248,7 @@
 
             }
         });
-        xhr.open("POST", "https://www.google.com.tw/inputtools/request?ime=handwriting&app=mobilesearch&cs=1&oe=UTF-8");
+        xhr.open("POST", serviceEndpointURLs[options.serviceEndpoint] || serviceEndpointURLs["default"]);
         xhr.setRequestHeader("content-type", "application/json");
         xhr.send(data);
     };
diff --git a/handwriting.js b/handwriting.js
index 9e63752..750fac0 100644
--- a/handwriting.js
+++ b/handwriting.js
@@ -20,6 +20,14 @@
             options = this.options;
             callback = this.callback;
         } else if (!options) options = {};
+        var serviceEndpointURLs = {
+            "default": "https://www.google.com.tw/inputtools/request?ime=handwriting&app=mobilesearch&cs=1&oe=UTF-8",
+            "google_tw": "https://www.google.com.tw/inputtools/request?ime=handwriting",
+            "google_jp": "https://www.google.co.jp/inputtools/request?ime=handwriting",
+            "google_kr": "https://www.google.co.kr/inputtools/request?ime=handwriting",
+            "google": "https://www.google.com/inputtools/request?ime=handwriting",
+            "inputtools": "https://inputtools.google.com/request?ime=handwriting"
+        }
         var data = JSON.stringify({
             "options": "enable_pre_space",
             "requests": [{
@@ -61,7 +69,7 @@
 
             }
         });
-        xhr.open("POST", "https://www.google.com.tw/inputtools/request?ime=handwriting&app=mobilesearch&cs=1&oe=UTF-8");
+        xhr.open("POST", serviceEndpointURLs[options.serviceEndpoint] || serviceEndpointURLs["default"]);
         xhr.setRequestHeader("content-type", "application/json");
         xhr.send(data);
     };