diff --git a/components/Modal/ImageUploadModal.tsx b/components/Modal/ImageUploadModal.tsx
index 25b4468..d7538c6 100644
--- a/components/Modal/ImageUploadModal.tsx
+++ b/components/Modal/ImageUploadModal.tsx
@@ -3,6 +3,8 @@ import React, { useEffect, useRef, useState } from 'react';
 
 import Button from '../Button';
 import Modal from './Modal';
+import SnackBar from '../SnackBar';
+import useSnackBar from '@/hooks/useSanckBar';
 
 interface ImageUploadModalProps {
   imageFile?: File | null;
@@ -11,12 +13,10 @@ interface ImageUploadModalProps {
   onGetImageFile: (file: File | null) => void;
 }
 
-/**
- * 이미지 업로드 모달 컴포넌트
- * @param isOpen 모달 오픈 여부
- * @param onClose 모달 닫기 함수
- * @returns ImageUploadModal 컴포넌트
- */
+const MAX_FILE_SIZE = 5 * 1024 * 1024; // 5MB 를 바이트로
+const NOT_SVG_MESSAGE =
+  'JPG, PNG, GIF, WebP 형식의 이미지만 업로드 가능합니다.';
+const SIZE_LIMIT_MESSAGE = '파일 크기는 5MB를 초과할 수 없습니다.';
 
 const ImageUploadModal = ({
   imageFile: initialImageFile = null,
@@ -24,76 +24,110 @@ const ImageUploadModal = ({
   onClose,
   onGetImageFile,
 }: ImageUploadModalProps) => {
-  // input 요소를 참조하기 위한 ref
   const fileInputRef = useRef<HTMLInputElement>(null);
-  // 선택한 이미지의 미리보기 url
   const [previewUrl, setPreviewUrl] = useState<string | null>(null);
   const [imageFile, setImageFile] = useState<File | null>(initialImageFile);
-  const [isDragging, setIsDragging] = useState(false); // 드래그 중인지 여부
+  const [isDragging, setIsDragging] = useState(false);
+  const [isValidFile, setIsValidFile] = useState<boolean>(true);
+  const { snackBarValues, snackBarOpen } = useSnackBar();
+
+  const validateFile = (file: File): boolean => {
+    setIsValidFile(true);
+
+    const allowedTypes = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'];
+    if (!allowedTypes.includes(file.type)) {
+      snackBarOpen('fail', NOT_SVG_MESSAGE);
+      setIsValidFile(false);
+      return false;
+    }
+
+    if (file.size > MAX_FILE_SIZE) {
+      snackBarOpen('fail', SIZE_LIMIT_MESSAGE);
+      setIsValidFile(false);
+      return false;
+    }
+
+    return true;
+  };
 
-  // 파일 선택시
   const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
-    // console.log('--- handleFileChange', e.target.files);
     const file = e.target.files?.[0];
     if (file) {
-      const previewUrl = URL.createObjectURL(file);
-      setPreviewUrl(previewUrl);
-      setImageFile(file);
+      if (validateFile(file)) {
+        const previewUrl = URL.createObjectURL(file);
+        setPreviewUrl(previewUrl);
+        setImageFile(file);
+      } else if (fileInputRef.current) {
+        fileInputRef.current.value = '';
+      }
     }
   };
 
-  // 이미지 파일 삭제
   const handleImageDelete = () => {
-    // console.log('--- handleImageDelete');
     if (fileInputRef.current) {
       fileInputRef.current.value = '';
       setPreviewUrl(null);
       setImageFile(null);
+      setIsValidFile(true);
     }
   };
 
-  // 드래그 관련 이벤트
-  // 드래그 시작
   const handleDragEnter = (e: React.DragEvent<HTMLElement>) => {
     e.preventDefault();
-    e.stopPropagation(); // 이벤트 전파 중지
+    e.stopPropagation();
     setIsDragging(true);
+
+    if (e.dataTransfer.items && e.dataTransfer.items.length > 0) {
+      const file = e.dataTransfer.items[0]?.getAsFile();
+      if (file) {
+        const allowedTypes = [
+          'image/jpeg',
+          'image/png',
+          'image/gif',
+          'image/webp',
+        ];
+        setIsValidFile(allowedTypes.includes(file.type));
+      }
+    }
   };
-  // 드래그가 영역을 벗어날 때
+
   const handleDragLeave = (e: React.DragEvent<HTMLElement>) => {
     e.preventDefault();
     e.stopPropagation();
     setIsDragging(false);
+    setIsValidFile(true); // 드래그가 끝나면 상태 초기화
   };
-  // 드래그 중
+
   const handleDragOver = (e: React.DragEvent<HTMLElement>) => {
     e.preventDefault();
     e.stopPropagation();
   };
-  // 드래그로 파일을 드랍했을 때
+
   const handleDrop = (e: React.DragEvent<HTMLElement>) => {
     e.preventDefault();
     e.stopPropagation();
     setIsDragging(false);
 
-    // length로 파일 존재 여부를 먼저 체크
     if (e.dataTransfer.files.length > 0) {
       const file = e.dataTransfer.files[0];
-      if (file) {
+      if (file && validateFile(file)) {
         setPreviewUrl(URL.createObjectURL(file));
         setImageFile(file);
       }
     }
   };
-
-  // 썸네일로 선택
   const handleImageSelect = () => {
     onGetImageFile(imageFile);
     onClose();
   };
 
   useEffect(() => {
-    // cleanup
+    if (isOpen) {
+      setIsValidFile(true);
+    }
+  }, [isOpen]);
+
+  useEffect(() => {
     return () => {
       if (previewUrl !== null) {
         URL.revokeObjectURL(previewUrl);
@@ -110,14 +144,14 @@ const ImageUploadModal = ({
 
   return (
     <Modal isOpen={isOpen} onClose={onClose}>
-      <div className="flex flex-col gap-5">
+      <div className="flex flex-col gap-5 bg-background">
         <p className="text-center text-18sb">이미지</p>
         <input
           id="image"
           type="file"
           ref={fileInputRef}
           onChange={handleFileChange}
-          accept="image/*"
+          accept="image/jpeg,image/png,image/gif,image/webp"
           className="hidden"
         />
         {previewUrl === null ? (
@@ -129,7 +163,9 @@ const ImageUploadModal = ({
             onDrop={handleDrop}
             className={`flex h-40 w-full cursor-pointer flex-col items-center justify-center rounded-lg border-2 border-dashed ${
               isDragging
-                ? 'border-green-400 bg-green-50'
+                ? isValidFile
+                  ? 'border-green-300 bg-green-100'
+                  : 'border-red-100 bg-red-50'
                 : 'border-gray-300 bg-gray-100 hover:border-gray-400'
             }`}
           >
@@ -142,6 +178,7 @@ const ImageUploadModal = ({
             <p className="mt-2 text-14 text-gray-400">
               클릭 또는 이미지를 드래그하여 올려주세요.
             </p>
+            <p className="mt-1 text-12 text-gray-400">(최대 5MB)</p>
           </label>
         ) : (
           <div className="relative flex h-40 w-full items-center justify-center rounded-lg border-2 border-dashed">
@@ -173,6 +210,14 @@ const ImageUploadModal = ({
           </Button>
         </div>
       </div>
+
+      <SnackBar
+        severity={snackBarValues.severity}
+        onClose={snackBarValues.onClose}
+        open={snackBarValues.open}
+      >
+        {snackBarValues.children}
+      </SnackBar>
     </Modal>
   );
 };
diff --git a/components/Modal/Modal.tsx b/components/Modal/Modal.tsx
index 4ef6b1b..e041d50 100644
--- a/components/Modal/Modal.tsx
+++ b/components/Modal/Modal.tsx
@@ -68,7 +68,7 @@ const Modal = ({
       />
 
       <div
-        className={`${width} relative max-h-[90vh] overflow-y-auto rounded-lg bg-white shadow-xl`}
+        className={`${width} relative max-h-[90vh] overflow-y-auto rounded-lg bg-background shadow-custom`}
       >
         {/* 닫기 버튼 영역 */}
         <button
@@ -84,7 +84,7 @@ const Modal = ({
           />
         </button>
         {/* 컨텐츠 영역 */}
-        <div className="px-5 pb-5 pt-[60px]">{children}</div>
+        <div className="bg-background px-5 pb-5 pt-[60px]">{children}</div>
       </div>
     </div>
   );
diff --git a/components/Modal/WikiQuizModal.tsx b/components/Modal/WikiQuizModal.tsx
index d43ffba..d9c2ebb 100644
--- a/components/Modal/WikiQuizModal.tsx
+++ b/components/Modal/WikiQuizModal.tsx
@@ -70,7 +70,7 @@ function WikiQuizModal({
           }`}
         >
           <div
-            className={`flex size-[42px] items-center justify-center rounded-full bg-white ${
+            className={`flex size-[42px] items-center justify-center rounded-full bg-background ${
               keyboardVisible ? '!size-auto' : ''
             }`}
           >