diff --git a/src/main/java/com/adoonge/seedzip/seed/service/SeedService.java b/src/main/java/com/adoonge/seedzip/seed/service/SeedService.java
index d467af7..5e75b24 100644
--- a/src/main/java/com/adoonge/seedzip/seed/service/SeedService.java
+++ b/src/main/java/com/adoonge/seedzip/seed/service/SeedService.java
@@ -33,6 +33,7 @@
 import com.adoonge.seedzip.tag.domain.type.DefaultTagType;
 import com.adoonge.seedzip.tag.repository.TagRepository;
 import com.adoonge.seedzip.tag.repository.UsedDefaultTagRepository;
+import com.amazonaws.services.dynamodbv2.xspec.S;
 
 import java.time.LocalDate;
 import java.time.temporal.ChronoUnit;
@@ -164,6 +165,16 @@ public SeedResponse.SeedInfoSimple uploadSeed(SeedRequest seedRequest, Member me
 
 	@Transactional
 	public void uploadFiles(Long seedId, List<MultipartFile> files) {
+		for(MultipartFile file : files){
+			String contentType = file.getContentType();
+			if (contentType == null ||
+				!(contentType.equalsIgnoreCase("image/png") ||
+					contentType.equalsIgnoreCase("image/jpg") ||
+					contentType.equalsIgnoreCase("image/jpeg"))) {
+				throw SeedzipException.from(ErrorCode.SEED_TYPE_NOT_SUPPORTED);
+			}
+		}
+
 		Seed seed = seedRepository.findById(seedId).orElseThrow(
 			() -> SeedzipException.from(ErrorCode.SEED_NOT_FOUND)
 		);
diff --git a/src/main/java/com/adoonge/seedzip/simplification/service/SimplificationService.java b/src/main/java/com/adoonge/seedzip/simplification/service/SimplificationService.java
index dc927a7..43744c4 100644
--- a/src/main/java/com/adoonge/seedzip/simplification/service/SimplificationService.java
+++ b/src/main/java/com/adoonge/seedzip/simplification/service/SimplificationService.java
@@ -1,5 +1,7 @@
 package com.adoonge.seedzip.simplification.service;
 
+import static com.adoonge.seedzip.global.exception.ErrorCode.*;
+
 import com.adoonge.seedzip.global.service.S3Service;
 import com.adoonge.seedzip.global.exception.ErrorCode;
 import com.adoonge.seedzip.global.exception.SeedzipException;
@@ -77,7 +79,21 @@ public SimplificationInfoResponse requestImageAnalysis(MultipartFile file)  {
         } catch (IOException e) {
             throw SeedzipException.from(ErrorCode.INTERNAL_SEVER_ERROR);
         }
-        String imageUrl = "data:image/jpeg;base64," + base64Image;
+
+        // MIME 타입 확인
+        String contentType = file.getContentType();
+        if (contentType == null) {
+            throw SeedzipException.from(SEED_TYPE_NOT_SUPPORTED);
+        }
+
+        // jpg/jpeg/png만 허용
+        if (!(contentType.equalsIgnoreCase("image/jpeg") ||
+            contentType.equalsIgnoreCase("image/jpg") ||
+            contentType.equalsIgnoreCase("image/png"))) {
+            throw SeedzipException.from(SEED_TYPE_NOT_SUPPORTED);}
+
+        String imageUrl = "data:" + contentType + ";base64," + base64Image;
+
         ChatGPTRequest request = ChatGPTRequest.createImageRequest(apiModel, 500, imageUrl);
         ChatGPTResponse chatGPTResponse =  template.postForObject(apiUrl, request, ChatGPTResponse.class);