diff --git a/src/common/libs/firebase/firebaseManager.js b/src/common/libs/firebase/firebaseManager.ts
similarity index 60%
rename from src/common/libs/firebase/firebaseManager.js
rename to src/common/libs/firebase/firebaseManager.ts
index 8007773b..088ff2fa 100644
--- a/src/common/libs/firebase/firebaseManager.js
+++ b/src/common/libs/firebase/firebaseManager.ts
@@ -1,12 +1,16 @@
 import {
   ref as firebaseRef,
   getDownloadURL,
-  uploadString,
+  uploadBytes,
 } from 'firebase/storage';
+import { uniqueId } from 'lodash';
 import { firebaseStorage } from './firebaseConfig';
 
-export const uploadFirebase = async (userId, file, dir) => {
-  let storageRef;
+export const uploadFirebase = async (
+  userId: number,
+  file: File,
+  dir = 'posting',
+) => {
   const date = new Date();
   const year = date.getFullYear();
   const month = ('0' + (1 + date.getMonth())).slice(-2);
@@ -16,11 +20,10 @@ export const uploadFirebase = async (userId, file, dir) => {
   const seconds = ('0' + date.getSeconds()).slice(-2);
   const now = year + month + day + hours + minutes + seconds;
 
-  storageRef = firebaseRef(firebaseStorage, `${dir}/${userId}_${now}`);
-  try {
-    const snapshot = await uploadString(storageRef, file, 'data_url');
-    return getDownloadURL(snapshot.ref);
-  } catch (e) {
-    return '';
-  }
+  const storageRef = firebaseRef(
+    firebaseStorage,
+    `${dir}/${userId}_${now}_${uniqueId()}`,
+  );
+  const snapshot = await uploadBytes(storageRef, file);
+  return getDownloadURL(snapshot.ref);
 };
diff --git a/src/features/posts/components/post-form/ImagePreview.tsx b/src/features/posts/components/post-form/ImagePreview.tsx
index a3f04f19..53811296 100644
--- a/src/features/posts/components/post-form/ImagePreview.tsx
+++ b/src/features/posts/components/post-form/ImagePreview.tsx
@@ -1,7 +1,7 @@
 import DeleteIcon from '@/common/assets/images/write/delete-icon.svg';
 
 interface ImagePreviewProps {
-  images: { id?: number; url: string }[];
+  images: string[];
   onDelete: (index: number) => () => void;
 }
 
@@ -9,12 +9,9 @@ export function ImagePreview({ images, onDelete }: ImagePreviewProps) {
   return (
     <div className="mt-[1.3rem] flex w-full space-x-[2.1rem]">
       {images.map((image, index) => (
-        <div
-          key={image.id + image.url}
-          className="relative h-[7.1rem] w-[7.1rem]"
-        >
+        <div key={image} className="relative h-[7.1rem] w-[7.1rem]">
           <img
-            src={image.url}
+            src={image}
             alt={'업로드 이미지'}
             className="h-full w-full object-cover"
           />
diff --git a/src/features/posts/components/post-form/PostForm.tsx b/src/features/posts/components/post-form/PostForm.tsx
index 0e75977f..9228f21c 100644
--- a/src/features/posts/components/post-form/PostForm.tsx
+++ b/src/features/posts/components/post-form/PostForm.tsx
@@ -1,3 +1,4 @@
+import { useMemo } from 'react';
 import { DockedButton, EditButton } from '@/common/components/ui/buttons';
 import { Select } from '@/common/components/ui/selections';
 import { CATEGORY_OPTIONS, DEADLINE_OPTIONS } from '@/common/constants/options';
@@ -49,7 +50,7 @@ export function PostForm({
           defaultValue={formData.title}
         />
         <ImagePreview
-          images={formData.images}
+          images={formData.images.map((image) => image.url)}
           onDelete={handlers.imageDelete}
         />
         <PostContentInput
@@ -100,9 +101,7 @@ export function PostForm({
               <PostVoteInput
                 key={i}
                 id={`post-form-voteOptions${i}`}
-                image={
-                  formData?.voteOptions ? formData.voteOptions[i].image : null
-                }
+                image={formData?.voteOptions[i]?.image?.url || null}
                 onChange={handlers.voteOptionChange(i)}
                 className="w-full"
                 onUploadImage={handlers.voteOptionImageUpload(i)}
diff --git a/src/features/posts/hooks/usePostForm.tsx b/src/features/posts/hooks/usePostForm.tsx
index aecff45f..3722eeef 100644
--- a/src/features/posts/hooks/usePostForm.tsx
+++ b/src/features/posts/hooks/usePostForm.tsx
@@ -1,11 +1,8 @@
 import { range } from 'lodash';
 import { FormEvent, useEffect, useState } from 'react';
-import { uploadFirebase } from '@/common/libs/firebase/firebaseManager';
 import { focusById } from '@/common/utils/dom/focus-by-id';
-import { resizeImage } from '@/common/utils/imageResizing';
 import { validatePostForm } from '@/common/utils/validations/post-form';
 import { PostFormData } from '@/features/posts/types/post-form';
-import { useUser } from '@/features/user/queries/useUser';
 
 const MIN_NUM_VOTE_OPTIONS = 2;
 export const MAX_NUM_VOTE_OPTIONS = 4;
@@ -20,7 +17,6 @@ export function usePostForm({
   onSubmit: (data: PostFormData) => void;
   onChange: (data: PostFormData) => void;
 }) {
-  const { user } = useUser();
   const [formData, setFormData] = useState<PostFormData>(
     initialData || {
       title: '',
@@ -49,20 +45,10 @@ export function usePostForm({
   };
 
   const handleMainImageUpload = (file: File) => {
-    const reader = new FileReader();
-    reader.onload = (e) => {
-      if (!e.target?.result || !user) {
-        return;
-      }
-      resizeImage(e.target.result.toString()).then(async (result) => {
-        const imgUrl = await uploadFirebase(user.id, result, 'posting');
-        setFormData({
-          ...formData,
-          images: [...formData.images, { url: imgUrl }],
-        });
-      });
-    };
-    reader.readAsDataURL(file);
+    setFormData({
+      ...formData,
+      images: [...formData.images, { file, url: URL.createObjectURL(file) }],
+    });
   };
 
   const handleTitleChange = (title: string) => {
@@ -84,21 +70,15 @@ export function usePostForm({
   };
 
   const handleVoteOptionImageUpload = (index: number) => (file: File) => {
-    const reader = new FileReader();
-    reader.onload = (e) => {
-      if (!e.target?.result || !user) {
-        return;
-      }
-      resizeImage(e.target.result.toString()).then(async (result) => {
-        const imgUrl = await uploadFirebase(user.id, result, 'posting');
-        const newVoteOptions = formData?.voteOptions
-          ? [...formData.voteOptions]
-          : [];
-        newVoteOptions[index].image = imgUrl;
-        setFormData({ ...formData, voteOptions: newVoteOptions });
-      });
-    };
-    reader.readAsDataURL(file);
+    const newVoteOptions = formData?.voteOptions
+      ? [...formData.voteOptions]
+      : [];
+    newVoteOptions[index].image = { file, url: URL.createObjectURL(file) };
+
+    setFormData({
+      ...formData,
+      voteOptions: newVoteOptions,
+    });
   };
 
   const handleVoteOptionImageDelete = (index: number) => () => {
diff --git a/src/features/posts/types/post-form.ts b/src/features/posts/types/post-form.ts
index a147fd38..3e7fd014 100644
--- a/src/features/posts/types/post-form.ts
+++ b/src/features/posts/types/post-form.ts
@@ -3,12 +3,16 @@ export interface PostFormData {
   content: string;
   images: {
     id?: number;
+    file: File;
     url: string;
   }[];
   categoryId?: number;
   deadline?: number;
   voteOptions: {
     label: string;
-    image: string | null;
+    image: {
+      file: File;
+      url: string;
+    } | null;
   }[];
 }
diff --git a/src/pages/write/WritePage.tsx b/src/pages/write/WritePage.tsx
index f013b656..b5a69bdb 100644
--- a/src/pages/write/WritePage.tsx
+++ b/src/pages/write/WritePage.tsx
@@ -3,6 +3,7 @@ import { useEffect, useState } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { TopAppBar } from '@/common/components/layout';
 import { Popup } from '@/common/components/ui/modal';
+import { uploadFirebase } from '@/common/libs/firebase/firebaseManager';
 import { scrollRestorationAtom } from '@/common/states/scroll-restoration';
 import getFutureDateTime from '@/common/utils/getFutureDateTime';
 import { PostForm } from '@/features/posts/components/post-form/PostForm';
@@ -17,6 +18,7 @@ export default function WritePage() {
   const navigate = useNavigate();
   const { mutate: addPost, isLoading, isSuccess, data } = useAddPost();
   const [hasChanges, setHasChanges] = useState(false);
+  const [uploadLoading, setUploadLoading] = useState(false);
   const { user } = useUser();
 
   const handleChange = ({
@@ -48,10 +50,25 @@ export default function WritePage() {
       return;
     }
 
+    setUploadLoading(true);
+    const uploadPromises = [
+      ...images.map((image) => uploadFirebase(user.id, image.file)),
+      ...voteOptions.map(
+        (option) => option.image && uploadFirebase(user.id, option.image.file),
+      ),
+    ];
+    const result = (await Promise.all(uploadPromises)).filter(
+      (url) => !!url,
+    ) as string[];
+    setUploadLoading(false);
+    const numOfMainImages = images.length;
+
     addPost({
       title: title.trim(),
       content: content.trim(),
-      files: images.map((image) => ({ url: image.url, contentType: 'image' })),
+      files: result
+        .slice(0, numOfMainImages)
+        .map((url) => ({ url, contentType: 'image' })),
       userId: user?.id,
       expirationTime: getFutureDateTime(deadline),
       choices: voteOptions
@@ -59,7 +76,7 @@ export default function WritePage() {
         .map((option, i) => ({
           sequenceNumber: i,
           label: option.label.trim(),
-          url: option.image || null,
+          url: result[numOfMainImages + i],
         })),
       worryCategoryId: categoryId,
     });
@@ -81,7 +98,7 @@ export default function WritePage() {
     }
   }, [isSuccess, data, navigate]);
 
-  if (isLoading) {
+  if (isLoading || uploadLoading) {
     return <PostUploading />;
   }