diff --git a/apps/web/src/app/community/[boardCode]/PostCards.tsx b/apps/web/src/app/community/[boardCode]/PostCards.tsx
index 5b2155ff4..118e15efc 100644
--- a/apps/web/src/app/community/[boardCode]/PostCards.tsx
+++ b/apps/web/src/app/community/[boardCode]/PostCards.tsx
@@ -94,21 +94,23 @@ export const PostCard = ({ post }: { post: ListPost }) => (
       </div>
     </div>
 
-    <div className="ml-4 mt-3 h-20 w-20 select-none">
-      {post.postThumbnailUrl ? (
-        <Image
-          className="rounded-md object-cover"
-          src={convertUploadedImageUrl(post.postThumbnailUrl)}
-          height={82}
-          width={82}
-          alt="게시글 사진"
-          fallbackSrc="/images/article-thumb.png"
-        />
-      ) : (
-        <div className="bg-gray-c-50 flex h-20 w-20 items-center justify-center rounded border border-k-100">
-          <IconSolidConnentionLogo />
-        </div>
-      )}
+    <div className="ml-4 mt-3 h-20 w-20 shrink-0 select-none">
+      <div className="bg-gray-c-50 relative h-full w-full overflow-hidden rounded border border-k-100">
+        {post.postThumbnailUrl ? (
+          <Image
+            className="object-cover"
+            src={convertUploadedImageUrl(post.postThumbnailUrl)}
+            fill
+            sizes="80px"
+            alt="게시글 사진"
+            fallbackSrc="/images/article-thumb.png"
+          />
+        ) : (
+          <div className="flex h-full w-full items-center justify-center">
+            <IconSolidConnentionLogo />
+          </div>
+        )}
+      </div>
     </div>
   </div>
 );
diff --git a/apps/web/src/app/community/[boardCode]/[postId]/modify/PostModifyForm.tsx b/apps/web/src/app/community/[boardCode]/[postId]/modify/PostModifyForm.tsx
index d9897b7e0..81299f471 100644
--- a/apps/web/src/app/community/[boardCode]/[postId]/modify/PostModifyForm.tsx
+++ b/apps/web/src/app/community/[boardCode]/[postId]/modify/PostModifyForm.tsx
@@ -1,7 +1,7 @@
 "use client";
 
 import { useRouter } from "next/navigation";
-import { useEffect, useRef, useState } from "react";
+import { type ChangeEvent, useEffect, useRef, useState } from "react";
 
 import { useUpdatePost } from "@/apis/community";
 import { toast } from "@/lib/zustand/useToastStore";
@@ -30,6 +30,8 @@ const PostModifyForm = ({
   const textareaRef = useRef<HTMLTextAreaElement>(null);
   const titleRef = useRef<HTMLDivElement>(null);
   const imageUploadRef = useRef<HTMLInputElement>(null);
+  const [selectedImage, setSelectedImage] = useState<File | null>(null);
+  const [imagePreviewUrl, setImagePreviewUrl] = useState<string | null>(null);
   const router = useRouter();
 
   const updatePostMutation = useUpdatePost();
@@ -61,6 +63,32 @@ const PostModifyForm = ({
     return () => {};
   }, []);
 
+  useEffect(() => {
+    if (!selectedImage) {
+      setImagePreviewUrl(null);
+      return;
+    }
+
+    const objectUrl = URL.createObjectURL(selectedImage);
+    setImagePreviewUrl(objectUrl);
+
+    return () => {
+      URL.revokeObjectURL(objectUrl);
+    };
+  }, [selectedImage]);
+
+  const handleImageChange = (event: ChangeEvent<HTMLInputElement>) => {
+    const file = event.target.files?.[0] ?? null;
+    setSelectedImage(file);
+  };
+
+  const removeSelectedImage = () => {
+    setSelectedImage(null);
+    if (imageUploadRef.current) {
+      imageUploadRef.current.value = "";
+    }
+  };
+
   const submitPost = async () => {
     if (!title.trim()) {
       toast.error("제목을 입력해주세요.");
@@ -82,7 +110,7 @@ const PostModifyForm = ({
             title,
             content,
           },
-          file: imageUploadRef.current?.files ? Array.from(imageUploadRef.current.files) : [],
+          file: selectedImage ? [selectedImage] : [],
         },
       },
       {
@@ -137,7 +165,7 @@ const PostModifyForm = ({
             >
               <IconImage />
             </button>
-            <input className="hidden" ref={imageUploadRef} type="file" accept="image/*" multiple />
+            <input className="hidden" ref={imageUploadRef} type="file" accept="image/*" onChange={handleImageChange} />
           </div>
         </div>
         <div>
@@ -148,6 +176,22 @@ const PostModifyForm = ({
             onChange={(e) => setContent(e.target.value)}
           />
         </div>
+        {imagePreviewUrl ? (
+          <div className="px-5 pb-2">
+            <p className="mb-2 text-gray-250/87 typo-regular-4">첨부 이미지</p>
+            <div className="relative h-24 w-24 overflow-hidden rounded-md border border-gray-c-100">
+              <img src={imagePreviewUrl} alt="업로드 이미지 미리보기" className="h-full w-full object-cover" />
+              <button
+                type="button"
+                className="absolute right-1 top-1 rounded bg-black/60 px-1 py-0.5 text-xs text-white"
+                onClick={removeSelectedImage}
+                aria-label="이미지 제거"
+              >
+                삭제
+              </button>
+            </div>
+          </div>
+        ) : null}
         <div className="px-5 pt-2.5">
           <p className="text-gray-250/87 typo-sb-9">{noticeTitle}</p>
           <p className="mt-2 whitespace-pre-line text-gray-100 typo-regular-4">{noticeContent}</p>
diff --git a/apps/web/src/app/community/[boardCode]/create/PostForm.tsx b/apps/web/src/app/community/[boardCode]/create/PostForm.tsx
index 1e45a8a22..7995a564c 100644
--- a/apps/web/src/app/community/[boardCode]/create/PostForm.tsx
+++ b/apps/web/src/app/community/[boardCode]/create/PostForm.tsx
@@ -1,7 +1,7 @@
 "use client";
 
 import { useRouter } from "next/navigation";
-import { useEffect, useRef, useState } from "react";
+import { type ChangeEvent, useEffect, useRef, useState } from "react";
 import { useCreatePost } from "@/apis/community";
 import TopDetailNavigation from "@/components/layout/TopDetailNavigation";
 import { IconImage, IconPostCheckboxFilled, IconPostCheckboxOutlined } from "@/public/svgs";
@@ -17,6 +17,8 @@ const PostForm = ({ boardCode }: PostFormProps) => {
   const imageUploadRef = useRef<HTMLInputElement>(null);
   const router = useRouter();
   const [isQuestion, setIsQuestion] = useState<boolean>(false);
+  const [selectedImage, setSelectedImage] = useState<File | null>(null);
+  const [imagePreviewUrl, setImagePreviewUrl] = useState<string | null>(null);
 
   const createPostMutation = useCreatePost();
 
@@ -43,6 +45,32 @@ const PostForm = ({ boardCode }: PostFormProps) => {
     return () => {};
   }, []);
 
+  useEffect(() => {
+    if (!selectedImage) {
+      setImagePreviewUrl(null);
+      return;
+    }
+
+    const objectUrl = URL.createObjectURL(selectedImage);
+    setImagePreviewUrl(objectUrl);
+
+    return () => {
+      URL.revokeObjectURL(objectUrl);
+    };
+  }, [selectedImage]);
+
+  const handleImageChange = (event: ChangeEvent<HTMLInputElement>) => {
+    const file = event.target.files?.[0] ?? null;
+    setSelectedImage(file);
+  };
+
+  const removeSelectedImage = () => {
+    setSelectedImage(null);
+    if (imageUploadRef.current) {
+      imageUploadRef.current.value = "";
+    }
+  };
+
   const submitPost = async () => {
     createPostMutation.mutate(
       {
@@ -53,7 +81,7 @@ const PostForm = ({ boardCode }: PostFormProps) => {
           content,
           isQuestion,
         },
-        file: imageUploadRef.current?.files ? Array.from(imageUploadRef.current.files) : [],
+        file: selectedImage ? [selectedImage] : [],
       },
       {
         onSuccess: (data) => {
@@ -116,7 +144,7 @@ const PostForm = ({ boardCode }: PostFormProps) => {
             >
               <IconImage />
             </button>
-            <input className="hidden" ref={imageUploadRef} type="file" accept="image/*" multiple />
+            <input className="hidden" ref={imageUploadRef} type="file" accept="image/*" onChange={handleImageChange} />
           </div>
         </div>
         <div>
@@ -127,6 +155,22 @@ const PostForm = ({ boardCode }: PostFormProps) => {
             onChange={(e) => setContent(e.target.value)}
           />
         </div>
+        {imagePreviewUrl ? (
+          <div className="px-5 pb-2">
+            <p className="mb-2 text-gray-250/87 typo-regular-4">첨부 이미지</p>
+            <div className="relative h-24 w-24 overflow-hidden rounded-md border border-gray-c-100">
+              <img src={imagePreviewUrl} alt="업로드 이미지 미리보기" className="h-full w-full object-cover" />
+              <button
+                type="button"
+                className="absolute right-1 top-1 rounded bg-black/60 px-1 py-0.5 text-xs text-white"
+                onClick={removeSelectedImage}
+                aria-label="이미지 제거"
+              >
+                삭제
+              </button>
+            </div>
+          </div>
+        ) : null}
         <div className="px-5 pt-2.5">
           <p className="text-gray-250/87 typo-sb-9">{noticeTitle}</p>
           <p className="mt-2 whitespace-pre-line text-gray-100 typo-regular-4">{noticeContent}</p>