diff --git a/src/main/java/com/kwcapstone/Service/S3Service.java b/src/main/java/com/kwcapstone/Service/S3Service.java
index 26044aa..a6af551 100644
--- a/src/main/java/com/kwcapstone/Service/S3Service.java
+++ b/src/main/java/com/kwcapstone/Service/S3Service.java
@@ -9,6 +9,8 @@
 import software.amazon.awssdk.services.s3.model.*;
 
 import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
 import java.nio.file.Paths;
 
 @Service
@@ -26,13 +28,35 @@ public String getS3FileUrl(String s3Path) {
         return "https://" + bucketName + ".s3." + region + ".amazonaws.com/" + s3Path;
     }
 
+//    // 업로드
+//    public void uploadFileToS3(String s3Path, File file) {
+//        PutObjectRequest putObjectRequest = PutObjectRequest.builder()
+//                .bucket(bucketName)
+//                .key(s3Path)
+//                .acl(ObjectCannedACL.BUCKET_OWNER_FULL_CONTROL)
+//                .build();
+//        s3Client.putObject(putObjectRequest, RequestBody.fromFile(file));
+//    }
+
     // 업로드
     public void uploadFileToS3(String s3Path, File file) {
+        String contentType;
+        try {
+            contentType = Files.probeContentType(file.toPath());
+            if (contentType == null) {
+                contentType = "application/octet-stream"; // fallback MIME
+            }
+        } catch (IOException e) {
+            contentType = "application/octet-stream";
+        }
+
         PutObjectRequest putObjectRequest = PutObjectRequest.builder()
                 .bucket(bucketName)
                 .key(s3Path)
-                .acl(ObjectCannedACL.BUCKET_OWNER_FULL_CONTROL)
+                .contentType(contentType)
+                .acl(ObjectCannedACL.PUBLIC_READ)
                 .build();
+
         s3Client.putObject(putObjectRequest, RequestBody.fromFile(file));
     }