diff --git a/src/main/java/com/wb/domainserver/util/file/service/FileStorageService.java b/src/main/java/com/wb/domainserver/util/file/service/FileStorageService.java
index f3be78c7..ca1fcaf1 100644
--- a/src/main/java/com/wb/domainserver/util/file/service/FileStorageService.java
+++ b/src/main/java/com/wb/domainserver/util/file/service/FileStorageService.java
@@ -310,8 +310,13 @@ public class FileStorageService {
 				if(image != null) {
 					thumbnail = image.getScaledInstance(destWidth, destHeight, Image.SCALE_SMOOTH);
 				}
-				BufferedImage convertImage = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);
-				convertImage.getGraphics().drawImage(thumbnail, posX, posY, null);
+				BufferedImage convertImage = new BufferedImage(destWidth, destHeight, getImageType(image, file.getOriginalFilename()));
+				Graphics graphics = convertImage.getGraphics();
+				try {
+					graphics.drawImage(thumbnail, posX, posY, null);
+				} finally {
+					graphics.dispose();
+				}
 
 				String ext = FilenameUtils.getExtension(file.getOriginalFilename());
 				ImageIO.write(convertImage, ext, os);
@@ -376,8 +381,13 @@ public class FileStorageService {
 				if(image != null) {
 					thumbnail = image.getScaledInstance(destWidth, destHeight, Image.SCALE_SMOOTH);
 				}
-				BufferedImage convertImage = new BufferedImage(thumbnailWidth, thumbnailHeight, BufferedImage.TYPE_INT_RGB);
-				convertImage.getGraphics().drawImage(thumbnail, posX, posY, null);
+				BufferedImage convertImage = new BufferedImage(thumbnailWidth, thumbnailHeight, getImageType(image, file.getOriginalFilename()));
+				Graphics graphics = convertImage.getGraphics();
+				try {
+					graphics.drawImage(thumbnail, posX, posY, null);
+				} finally {
+					graphics.dispose();
+				}
 
 				ImageIO.write(convertImage, ext, os);
 			}catch (WnbtRestException wre){
@@ -407,6 +417,14 @@ public class FileStorageService {
 		return thumbnail_file;
 	}
 
+	private int getImageType(BufferedImage image, String originalFileName) {
+		String ext = FilenameUtils.getExtension(originalFileName).toLowerCase(Locale.ROOT);
+		boolean supportsAlpha = "png".equals(ext) || "gif".equals(ext);
+		return image != null && image.getColorModel().hasAlpha() && supportsAlpha
+				? BufferedImage.TYPE_INT_ARGB
+				: BufferedImage.TYPE_INT_RGB;
+	}
+
 
 	/**
 	 * combineFilePath 에 지정된 경로에 저장이 됨
@@ -715,4 +733,4 @@ public class FileStorageService {
 		return rtnStr;
 	}
 
-}
\ No newline at end of file
+}