diff --git a/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java b/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java
index 0ef3a73..f6f3965 100644
--- a/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java
@@ -41,6 +41,7 @@
     private Button MakeAccountButton;
     private ImageView iconChoice;
     private String iconImageBase64;
+    private int quality = 70;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -185,27 +186,21 @@
                     //画像をBase64に変換
                     ByteArrayOutputStream baos = new ByteArrayOutputStream();
                     Bitmap afterResizeBitmap = Bitmap.createScaledBitmap(image,50,50,true);
-                    afterResizeBitmap.compress(Bitmap.CompressFormat.JPEG,70, baos);
+                    afterResizeBitmap.compress(Bitmap.CompressFormat.JPEG,quality, baos);
 
                     byte[] b = baos.toByteArray();
                     String imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);
 
-                    if(imageEncoded.length() <= 2000){
-                        iconChoice.setImageBitmap(image);
-                        iconImageBase64 = imageEncoded;
-                    }else{
-                        //byte→stringで2000文字以上なら、圧縮率を上げて再変換
-                        afterResizeBitmap.compress(Bitmap.CompressFormat.JPEG,60, baos);
+                    while (imageEncoded.length() >2000){
+                        //文字数の2000文字以下になるまで圧縮率を上げて再度変換
+                        baos = new ByteArrayOutputStream();
+                        quality -=5;
+                        afterResizeBitmap.compress(Bitmap.CompressFormat.JPEG,quality, baos);
                         b = baos.toByteArray();
                         imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);
-                        if(imageEncoded.length() <=2000){
-                            iconChoice.setImageBitmap(image);
-                            iconImageBase64 = imageEncoded;
-                        }else{
-                            Toast.makeText(SignupActivity.this,
-                                    "この画像は使用できません。\n別の画像を選択してください。",Toast.LENGTH_LONG).show();
-                        }
                     }
+                    iconChoice.setImageBitmap(image);
+                    iconImageBase64 = imageEncoded;
                 }catch(IOException e){
                     e.printStackTrace();
                 }