diff --git a/docs/index.html b/docs/index.html
index 6449c010..6094d7d9 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -34,6 +34,7 @@ <h1>Index</h1>
                                     <li>
                                         <a href="#p_options">options</a>
                                         <ul>
+                                            <li><a href="#p_config">config</a></li>
                                             <li><a href="#p_debug">debug</a></li>
                                             <li><a href="#p_drawAllImageOnLoad">drawAllImageOnLoad</a></li>
                                             <li><a href="#p_enableLegacyPiP">enableLegacyPiP</a></li>
@@ -41,6 +42,7 @@ <h1>Index</h1>
                                             <li><a href="#p_formatted">formatted</a></li>
                                             <li><a href="#p_keepCA">keepCA</a></li>
                                             <li><a href="#p_mode">mode</a></li>
+                                            <li><a href="#p_scale">scale</a></li>
                                             <li><a href="#p_showCollision">showCollision</a></li>
                                             <li><a href="#p_showCommentCount">showCommentCount</a></li>
                                             <li><a href="#p_showFPS">showFPS</a></li>
@@ -211,6 +213,7 @@ <h4 id="p_keepCA">keepCA<span class="type">:boolean</span> = <span class="yellow
                         <p>別のCAや関係ないコメントによってCA(主に積み絵)が崩壊するのを抑制します</p>
                         <p>デフォルト(<span class="yellow">false</span>)の場合は通常通り位置決定を行います</p>
                         <p><span class="yellow">true</span>の場合はCAを投稿していると推定されるユーザーのレイヤーを分けて位置決定をおこないます</p>
+                        <p>また、該当CAの拡大縮小を抑制する効果もあります</p>
                     </div>
                     <h4 id="p_mode">mode<span class="type"><a href="./type/modules/_types_types.mode.html">:modeType</a></span> = <span class="green">"default"</span></h4>
                     <div class="item">
@@ -219,6 +222,11 @@ <h4 id="p_mode">mode<span class="type"><a href="./type/modules/_types_types.mode
                         <p><span class="green">"html5"</span>の場合は、現行のhtml5プレイヤーに近い動作をします</p>
                         <p><span class="green">"flash"</span>の場合は、Saccubus/ZenzaWatchなどflash時代の互換プレイヤーに近い動作をします</p>
                     </div>
+                    <h4 id="p_scale">scale<span class="type">:number</span> = <span class="yellow">1</span></h4>
+                    <div class="item">
+                        <p>表示コメントサイズを拡大縮小します</p>
+                        <p><a href="#p_keepCA">keepCA</a>を併用することを推奨します</p>
+                    </div>
                     <h4 id="p_showCollision">showCollision<span class="type">:boolean</span> = <span class="yellow">false</span></h4>
                     <div class="item">
                         <p><span class="note">初期化後も随時設定の変更が可能です</span></p>
diff --git a/src/@types/types.d.ts b/src/@types/types.d.ts
index 0b2d523f..71cb9fe3 100644
--- a/src/@types/types.d.ts
+++ b/src/@types/types.d.ts
@@ -8,34 +8,36 @@ type inputFormatType =
   | "default";
 type modeType = "default" | "html5" | "flash";
 type InitOptions = {
-  mode?: modeType;
-  useLegacy?: boolean;
-  formatted?: boolean;
-  format?: inputFormatType;
-  video?: HTMLVideoElement | undefined;
-  showCollision?: boolean;
-  showFPS?: boolean;
-  showCommentCount?: boolean;
-  drawAllImageOnLoad?: boolean;
+  config?: ConfigNullable;
   debug?: boolean;
+  drawAllImageOnLoad?: boolean;
   enableLegacyPiP?: boolean;
+  format?: inputFormatType;
+  formatted?: boolean;
   keepCA?: boolean;
-  config?: ConfigNullable;
+  mode?: modeType;
+  scale?: number;
+  showCollision?: boolean;
+  showCommentCount?: boolean;
+  showFPS?: boolean;
+  useLegacy?: boolean;
+  video?: HTMLVideoElement | undefined;
 };
 type Options = {
-  mode: modeType;
-  useLegacy: boolean;
-  formatted: boolean;
-  format: inputFormatType;
-  video: HTMLVideoElement | undefined;
-  showCollision: boolean;
-  showFPS: boolean;
-  showCommentCount: boolean;
-  drawAllImageOnLoad: boolean;
+  config: ConfigNullable;
   debug: boolean;
+  drawAllImageOnLoad: boolean;
   enableLegacyPiP: boolean;
+  format: inputFormatType;
+  formatted: boolean;
   keepCA: boolean;
-  config: ConfigNullable;
+  mode: modeType;
+  scale: number;
+  showCollision: boolean;
+  showCommentCount: boolean;
+  showFPS: boolean;
+  useLegacy: boolean;
+  video: HTMLVideoElement | undefined;
 };
 type rawApiResponse = {
   [key: string]: apiPing | apiThread | apiLeaf | apiGlobalNumRes | apiChat;
diff --git a/src/definition/config.ts b/src/definition/config.ts
index ec054181..87b6c718 100644
--- a/src/definition/config.ts
+++ b/src/definition/config.ts
@@ -160,19 +160,20 @@ const defaultConfig: Config = {
  * 既定の設定
  */
 const defaultOptions: Options = {
-  mode: "default",
+  config: {},
+  debug: false,
   drawAllImageOnLoad: false,
+  enableLegacyPiP: false,
   format: "default",
   formatted: false,
-  debug: false,
-  enableLegacyPiP: false,
   keepCA: false,
+  mode: "default",
+  scale: 1,
   showCollision: false,
   showCommentCount: false,
   showFPS: false,
   useLegacy: false,
   video: undefined,
-  config: {},
 };
 
 let config: Config;
diff --git a/src/main.ts b/src/main.ts
index cb3bd8bd..dc500b90 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -35,7 +35,6 @@ class NiconiComments {
   private readonly canvas: HTMLCanvasElement;
   private readonly collision: collision;
   private readonly context: CanvasRenderingContext2D;
-  private readonly keepCA: boolean;
   private readonly nicoScripts: nicoScript;
   private readonly timeline: { [key: number]: number[] };
   private readonly mode: modeType;
@@ -104,8 +103,6 @@ class NiconiComments {
     this.showFPS = options.showFPS;
     this.showCommentCount = options.showCommentCount;
     this.enableLegacyPiP = options.enableLegacyPiP;
-    this.keepCA = options.keepCA;
-    console.log(this.keepCA);
 
     this.cacheIndex = {};
     this.timeline = {};
@@ -137,7 +134,7 @@ class NiconiComments {
    */
   preRendering(rawData: formattedComment[], drawAll: boolean) {
     const preRenderingStart = performance.now();
-    if (this.keepCA) {
+    if (options.keepCA) {
       rawData = changeCALayer(rawData);
     }
     const parsedData: parsedComment[] = this.getCommentPos(
@@ -185,13 +182,21 @@ class NiconiComments {
           }
           const measure = this.measureText(comment);
           const size = parsedData[comment.index] as formattedCommentWithSize;
+          if (options.scale !== 1 && size.layer === -1) {
+            measure.height *= options.scale;
+            measure.width *= options.scale;
+            measure.width_max *= options.scale;
+            measure.width_min *= options.scale;
+            //measure.lineHeight *= options.scale;
+            measure.fontSize *= options.scale;
+          }
           size.height = measure.height;
           size.width = measure.width;
           size.width_max = measure.width_max;
           size.width_min = measure.width_min;
           size.lineHeight = measure.lineHeight;
+          size.fontSize = measure.fontSize;
           if (measure.resized) {
-            size.fontSize = measure.fontSize;
             this.context.font = parseFont(font, fontSize, this.mode);
           }
           result[comment.index] = size;
diff --git a/src/typeGuard.ts b/src/typeGuard.ts
index a736eaf6..f1d3851f 100644
--- a/src/typeGuard.ts
+++ b/src/typeGuard.ts
@@ -224,6 +224,7 @@ const typeGuard = {
         debug: isBoolean,
         enableLegacyPiP: isBoolean,
         keepCA: isBoolean,
+        scale: isNumber,
         config: typeGuard.config.config,
         format: (i: unknown) =>
           typeof i === "string" &&
@@ -234,7 +235,6 @@ const typeGuard = {
           typeof i === "object" && (i as HTMLVideoElement).nodeName === "VIDEO",
       };
       for (const key in keys) {
-        console.log(keys[key]);
         if (
           (item as { [key: string]: unknown })[key] !== undefined &&
           !(keys[key] as (i: unknown) => boolean)(
@@ -333,7 +333,6 @@ const typeGuard = {
           ) === 0,
       };
       for (const key in item) {
-        console.log(key, item, keys);
         if (
           (item as { [key: string]: unknown })[key] !== undefined &&
           !(keys[key] as (i: unknown) => boolean)(