diff --git a/src/app/molecules/image-pack/ImagePack.jsx b/src/app/molecules/image-pack/ImagePack.jsx
index 8cd45a5d..32253497 100644
--- a/src/app/molecules/image-pack/ImagePack.jsx
+++ b/src/app/molecules/image-pack/ImagePack.jsx
@@ -1,15 +1,58 @@
-import React, { useState } from 'react';
+import React, {
+  useState, useMemo, useReducer,
+} from 'react';
 import PropTypes from 'prop-types';
 import './ImagePack.scss';
 
 import initMatrix from '../../../client/initMatrix';
+import { openReusableDialog } from '../../../client/action/navigation';
+import { suffixRename } from '../../../util/common';
 
 import Button from '../../atoms/button/Button';
 import Text from '../../atoms/text/Text';
+import Input from '../../atoms/input/Input';
+import Checkbox from '../../atoms/button/Checkbox';
+
+import { ImagePack as ImagePackBuilder } from '../../organisms/emoji-board/custom-emoji';
+import { confirmDialog } from '../confirm-dialog/ConfirmDialog';
 import ImagePackProfile from './ImagePackProfile';
 import ImagePackItem from './ImagePackItem';
-import Checkbox from '../../atoms/button/Checkbox';
-import { ImagePack as ImagePackBuilder, getUserImagePack } from '../../organisms/emoji-board/custom-emoji';
+import ImagePackUpload from './ImagePackUpload';
+
+const renameImagePackItem = (shortcode) => new Promise((resolve) => {
+  let isCompleted = false;
+
+  openReusableDialog(
+    <Text variant="s1" weight="medium">Rename</Text>,
+    (requestClose) => (
+      <div style={{ padding: 'var(--sp-normal)' }}>
+        <form
+          onSubmit={(e) => {
+            e.preventDefault();
+            const sc = e.target.shortcode.value;
+            if (sc.trim() === '') return;
+            isCompleted = true;
+            resolve(sc.trim());
+            requestClose();
+          }}
+        >
+          <Input
+            value={shortcode}
+            name="shortcode"
+            label="Shortcode"
+            autoFocus
+            required
+          />
+          <div style={{ height: 'var(--sp-normal)' }} />
+          <Button variant="primary" type="submit">Rename</Button>
+        </form>
+      </div>
+    ),
+    () => {
+      if (!isCompleted) resolve(null);
+    },
+  );
+});
 
 function getUsage(usage) {
   if (usage.includes('emoticon') && usage.includes('sticker')) return 'both';
@@ -30,46 +73,159 @@ function isGlobalPack(roomId, stateKey) {
   return rooms[roomId]?.[stateKey] !== undefined;
 }
 
+function useRoomImagePack(roomId, stateKey) {
+  const mx = initMatrix.matrixClient;
+  const room = mx.getRoom(roomId);
+
+  const packEvent = room.currentState.getStateEvents('im.ponies.room_emotes', stateKey);
+  const pack = useMemo(() => (
+    ImagePackBuilder.parsePack(packEvent.getId(), packEvent.getContent(), room)
+  ), [room, stateKey]);
+
+  const sendPackContent = (content) => {
+    mx.sendStateEvent(roomId, 'im.ponies.room_emotes', content, stateKey);
+  };
+
+  return {
+    pack,
+    sendPackContent,
+  };
+}
+
+function useImagePackHandles(pack, sendPackContent) {
+  const [, forceUpdate] = useReducer((count) => count + 1, 0);
+
+  const getNewKey = (key) => {
+    if (typeof key !== 'string') return undefined;
+    let newKey = key?.replace(/\s/g, '-');
+    if (pack.getImages().get(newKey)) {
+      newKey = suffixRename(
+        newKey,
+        (suffixedKey) => pack.getImages().get(suffixedKey),
+      );
+    }
+    return newKey;
+  };
+
+  const handleEditProfile = () => false;
+  const handleUsageChange = (newUsage) => {
+    const usage = [];
+    if (newUsage === 'emoticon' || newUsage === 'both') usage.push('emoticon');
+    if (newUsage === 'sticker' || newUsage === 'both') usage.push('sticker');
+    pack.setUsage(usage);
+    pack.getImages().forEach((img) => pack.setImageUsage(img.shortcode, undefined));
+
+    sendPackContent(pack.getContent());
+    forceUpdate();
+  };
+
+  const handleRenameItem = async (key) => {
+    const newKey = getNewKey(await renameImagePackItem(key));
+
+    if (!newKey || newKey === key) return;
+    pack.updateImageKey(key, newKey);
+
+    sendPackContent(pack.getContent());
+    forceUpdate();
+  };
+  const handleDeleteItem = async (key) => {
+    const isConfirmed = await confirmDialog(
+      'Delete',
+      `Are you sure that you want to delete "${key}"?`,
+      'Delete',
+      'danger',
+    );
+    if (!isConfirmed) return;
+    pack.removeImage(key);
+
+    sendPackContent(pack.getContent());
+    forceUpdate();
+  };
+  const handleUsageItem = (key, newUsage) => {
+    const usage = [];
+    if (newUsage === 'emoticon' || newUsage === 'both') usage.push('emoticon');
+    if (newUsage === 'sticker' || newUsage === 'both') usage.push('sticker');
+    pack.setImageUsage(key, usage);
+
+    sendPackContent(pack.getContent());
+    forceUpdate();
+  };
+  const handleAddItem = (key, url) => {
+    const newKey = getNewKey(key);
+    if (!newKey || !url) return;
+
+    pack.addImage(newKey, {
+      url,
+    });
+
+    sendPackContent(pack.getContent());
+    forceUpdate();
+  };
+
+  return {
+    handleEditProfile,
+    handleUsageChange,
+    handleRenameItem,
+    handleDeleteItem,
+    handleUsageItem,
+    handleAddItem,
+  };
+}
+
 function ImagePack({ roomId, stateKey }) {
   const mx = initMatrix.matrixClient;
   const room = mx.getRoom(roomId);
   const [viewMore, setViewMore] = useState(false);
 
-  const packEvent = roomId
-    ? room.currentState.getStateEvents('im.ponies.room_emotes', stateKey)
-    : mx.getAccountData('im.ponies.user_emotes');
-  const pack = roomId
-    ? ImagePackBuilder.parsePack(packEvent.getId(), packEvent.getContent(), room)
-    : getUserImagePack(mx);
+  const { pack, sendPackContent } = useRoomImagePack(roomId, stateKey);
+
+  const {
+    handleEditProfile,
+    handleUsageChange,
+    handleRenameItem,
+    handleDeleteItem,
+    handleUsageItem,
+    handleAddItem,
+  } = useImagePackHandles(pack, sendPackContent);
+
+  const myPowerlevel = room.getMember(mx.getUserId())?.powerLevel || 0;
+  const canChange = room.currentState.hasSufficientPowerLevelFor('state_default', myPowerlevel);
+
+  const images = [...pack.images].slice(0, viewMore ? pack.images.size : 2);
 
   return (
     <div className="image-pack">
       <ImagePackProfile
-        avatarUrl={mx.mxcUrlToHttp(pack.avatarUrl ?? pack.getEmojis()[0].mxc)}
-        displayName={pack.displayName}
+        avatarUrl={mx.mxcUrlToHttp(pack.avatarUrl)}
+        displayName={pack.displayName ?? 'Unknown'}
         attribution={pack.attribution}
         usage={getUsage(pack.usage)}
-        onUsageChange={(newUsage) => console.log(newUsage)}
-        onEdit={() => false}
+        onUsageChange={canChange ? handleUsageChange : undefined}
+        onEdit={canChange ? handleEditProfile : undefined}
       />
-      <div>
-        <div className="image-pack__header">
-          <Text variant="b3">Image</Text>
-          <Text variant="b3">Shortcode</Text>
-          <Text variant="b3">Usage</Text>
+      { canChange && (
+        <ImagePackUpload onUpload={handleAddItem} />
+      )}
+      { images.length === 0 ? null : (
+        <div>
+          <div className="image-pack__header">
+            <Text variant="b3">Image</Text>
+            <Text variant="b3">Shortcode</Text>
+            <Text variant="b3">Usage</Text>
+          </div>
+          {images.map(([shortcode, image]) => (
+            <ImagePackItem
+              key={shortcode}
+              url={mx.mxcUrlToHttp(image.mxc)}
+              shortcode={shortcode}
+              usage={getUsage(image.usage)}
+              onUsageChange={canChange ? handleUsageItem : undefined}
+              onDelete={canChange ? handleDeleteItem : undefined}
+              onRename={canChange ? handleRenameItem : undefined}
+            />
+          ))}
         </div>
-        {([...pack.images].slice(0, viewMore ? pack.images.size : 2)).map(([shortcode, image]) => (
-          <ImagePackItem
-            key={shortcode}
-            url={mx.mxcUrlToHttp(image.mxc)}
-            shortcode={shortcode}
-            usage={getUsage(image.usage)}
-            onUsageChange={() => false}
-            onDelete={() => false}
-            onRename={() => false}
-          />
-        ))}
-      </div>
+      )}
       {pack.images.size > 2 && (
         <div className="image-pack__footer">
           <Button onClick={() => setViewMore(!viewMore)}>
@@ -81,27 +237,20 @@ function ImagePack({ roomId, stateKey }) {
           </Button>
         </div>
       )}
-      { roomId && (
-        <div className="image-pack__global">
-          <Checkbox variant="positive" isActive={isGlobalPack(roomId, stateKey)} />
-          <div>
-            <Text variant="b2">Use globally</Text>
-            <Text variant="b3">Add this pack to your account to use in all rooms.</Text>
-          </div>
+      <div className="image-pack__global">
+        <Checkbox variant="positive" isActive={isGlobalPack(roomId, stateKey)} />
+        <div>
+          <Text variant="b2">Use globally</Text>
+          <Text variant="b3">Add this pack to your account to use in all rooms.</Text>
         </div>
-      )}
+      </div>
     </div>
   );
 }
 
-ImagePack.defaultProps = {
-  roomId: null,
-  stateKey: null,
-};
-
 ImagePack.propTypes = {
-  roomId: PropTypes.string,
-  stateKey: PropTypes.string,
+  roomId: PropTypes.string.isRequired,
+  stateKey: PropTypes.string.isRequired,
 };
 
 export default ImagePack;
diff --git a/src/app/molecules/image-pack/ImagePack.scss b/src/app/molecules/image-pack/ImagePack.scss
index b4becfbf..7c62ffc9 100644
--- a/src/app/molecules/image-pack/ImagePack.scss
+++ b/src/app/molecules/image-pack/ImagePack.scss
@@ -19,7 +19,9 @@
   &__footer {
     padding: var(--sp-normal);
     display: flex;
+    gap: var(--sp-tight);
   }
+
   &__global {
     padding: var(--sp-normal);
     padding-top: var(--sp-tight);
@@ -27,4 +29,4 @@
     align-items: center;
     gap: var(--sp-normal);
   }
-}
\ No newline at end of file
+}
diff --git a/src/app/molecules/image-pack/ImagePackItem.jsx b/src/app/molecules/image-pack/ImagePackItem.jsx
index d0f531b8..27436793 100644
--- a/src/app/molecules/image-pack/ImagePackItem.jsx
+++ b/src/app/molecules/image-pack/ImagePackItem.jsx
@@ -27,7 +27,7 @@ function ImagePackItem({
         <ImagePackUsageSelector
           usage={usage}
           onSelect={(newUsage) => {
-            onUsageChange(newUsage);
+            onUsageChange(shortcode, newUsage);
             closeMenu();
           }}
         />
@@ -43,8 +43,8 @@ function ImagePackItem({
       </div>
       <div className="image-pack-item__usage">
         <div className="image-pack-item__btn">
-          {onRename && <IconButton tooltip="Rename" size="extra-small" src={PencilIC} onClick={onRename} />}
-          {onDelete && <IconButton tooltip="Delete" size="extra-small" src={BinIC} onClick={onDelete} />}
+          {onRename && <IconButton tooltip="Rename" size="extra-small" src={PencilIC} onClick={() => onRename(shortcode)} />}
+          {onDelete && <IconButton tooltip="Delete" size="extra-small" src={BinIC} onClick={() => onDelete(shortcode)} />}
         </div>
         <Button onClick={onUsageChange ? handleUsageSelect : undefined}>
           {onUsageChange && <RawIcon src={ChevronBottomIC} size="extra-small" />}
diff --git a/src/app/molecules/image-pack/ImagePackProfile.jsx b/src/app/molecules/image-pack/ImagePackProfile.jsx
index f735448e..fd6dd568 100644
--- a/src/app/molecules/image-pack/ImagePackProfile.jsx
+++ b/src/app/molecules/image-pack/ImagePackProfile.jsx
@@ -35,7 +35,7 @@ function ImagePackProfile({
 
   return (
     <div className="image-pack-profile">
-      <Avatar text={displayName} bgColor="blue" imageSrc={avatarUrl} size="normal" />
+      {avatarUrl && <Avatar text={displayName} bgColor="blue" imageSrc={avatarUrl} size="normal" />}
       <div className="image-pack-profile__content">
         <div>
           <Text>{displayName}</Text>
diff --git a/src/app/molecules/image-pack/ImagePackUpload.jsx b/src/app/molecules/image-pack/ImagePackUpload.jsx
new file mode 100644
index 00000000..df048f1f
--- /dev/null
+++ b/src/app/molecules/image-pack/ImagePackUpload.jsx
@@ -0,0 +1,72 @@
+import React, { useState, useRef } from 'react';
+import PropTypes from 'prop-types';
+import './ImagePackUpload.scss';
+
+import initMatrix from '../../../client/initMatrix';
+import { scaleDownImage } from '../../../util/common';
+
+import Text from '../../atoms/text/Text';
+import Button from '../../atoms/button/Button';
+import Input from '../../atoms/input/Input';
+import IconButton from '../../atoms/button/IconButton';
+import CirclePlusIC from '../../../../public/res/ic/outlined/circle-plus.svg';
+
+function ImagePackUpload({ onUpload }) {
+  const mx = initMatrix.matrixClient;
+  const inputRef = useRef(null);
+  const shortcodeRef = useRef(null);
+  const [imgFile, setImgFile] = useState(null);
+  const [progress, setProgress] = useState(false);
+
+  const handleSubmit = async (evt) => {
+    evt.preventDefault();
+    if (!imgFile) return;
+    const { shortcodeInput } = evt.target;
+    const shortcode = shortcodeInput.value.trim();
+    if (shortcode === '') return;
+
+    setProgress(true);
+    const image = await scaleDownImage(imgFile, 512, 512);
+    const url = await mx.uploadContent(image, {
+      onlyContentUri: true,
+    });
+
+    onUpload(shortcode, url);
+    setProgress(false);
+    setImgFile(null);
+    shortcodeRef.current.value = '';
+  };
+
+  const handleFileChange = (evt) => {
+    const img = evt.target.files[0];
+    if (!img) return;
+    setImgFile(img);
+  };
+  const handleRemove = () => {
+    setImgFile(null);
+    inputRef.current.value = null;
+  };
+
+  return (
+    <form onSubmit={handleSubmit} className="image-pack-upload">
+      <input ref={inputRef} onChange={handleFileChange} style={{ display: 'none' }} type="file" accept=".png, .gif, .webp" required />
+      {
+        imgFile
+          ? (
+            <div className="image-pack-upload__file">
+              <IconButton onClick={handleRemove} src={CirclePlusIC} tooltip="Remove file" />
+              <Text>{imgFile.name}</Text>
+            </div>
+          )
+          : <Button onClick={() => inputRef.current.click()}>Import image</Button>
+      }
+      <Input forwardRef={shortcodeRef} name="shortcodeInput" placeholder="shortcode" required />
+      <Button disabled={progress} variant="primary" type="submit">{progress ? 'Uploading...' : 'Upload'}</Button>
+    </form>
+  );
+}
+ImagePackUpload.propTypes = {
+  onUpload: PropTypes.func.isRequired,
+};
+
+export default ImagePackUpload;
diff --git a/src/app/molecules/image-pack/ImagePackUpload.scss b/src/app/molecules/image-pack/ImagePackUpload.scss
new file mode 100644
index 00000000..75b57ed2
--- /dev/null
+++ b/src/app/molecules/image-pack/ImagePackUpload.scss
@@ -0,0 +1,43 @@
+@use '../../partials/dir';
+@use '../../partials/text';
+
+.image-pack-upload {
+  padding: var(--sp-normal);
+  padding-top: 0;
+  display: flex;
+  gap: var(--sp-tight);
+
+  & > .input-container {
+    flex-grow: 1;
+    input {
+      padding: 9px var(--sp-normal);
+    }
+  }
+  &__file {
+    display: inline-flex;
+    align-items: center;
+    background: var(--bg-surface-low);
+    border-radius: var(--bo-radius);
+    box-shadow: var(--bs-surface-border);
+  
+    & button {
+      --parent-height: 40px;
+      width: var(--parent-height);
+      height: 100%;
+      display: flex;
+      justify-content: center;
+      align-items: center;
+    }
+  
+    & .ic-raw {
+      background-color: var(--bg-caution);
+      transform: rotate(45deg);
+    }
+    
+    & .text {
+      @extend .cp-txt__ellipsis;
+      @include dir.side(margin, var(--sp-ultra-tight), var(--sp-normal));
+      max-width: 86px;
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/app/organisms/emoji-board/EmojiBoard.jsx b/src/app/organisms/emoji-board/EmojiBoard.jsx
index 1e8fce8d..ba8ab213 100644
--- a/src/app/organisms/emoji-board/EmojiBoard.jsx
+++ b/src/app/organisms/emoji-board/EmojiBoard.jsx
@@ -257,7 +257,7 @@ function EmojiBoard({ onSelect, searchRef }) {
               {
                 availableEmojis.map((pack) => (
                   <EmojiGroup
-                    name={pack.displayName}
+                    name={pack.displayName ?? 'Unknown'}
                     key={pack.packIndex}
                     groupEmojis={pack.getEmojis()}
                     className="custom-emoji-group"
@@ -297,7 +297,7 @@ function EmojiBoard({ onSelect, searchRef }) {
                     onClick={() => openGroup(recentOffset + pack.packIndex)}
                     src={src}
                     key={pack.packIndex}
-                    tooltip={pack.displayName}
+                    tooltip={pack.displayName ?? 'Unknown'}
                     tooltipPlacement="right"
                     isImage
                   />
diff --git a/src/app/organisms/emoji-board/custom-emoji.js b/src/app/organisms/emoji-board/custom-emoji.js
index 9ba7c5e7..026e08b6 100644
--- a/src/app/organisms/emoji-board/custom-emoji.js
+++ b/src/app/organisms/emoji-board/custom-emoji.js
@@ -8,20 +8,38 @@ class ImagePack {
       return null;
     }
 
-    const pack = packContent.pack ?? {};
+    return new ImagePack(eventId, packContent, room);
+  }
 
-    const displayName = pack.display_name ?? room?.name ?? undefined;
-    const avatarUrl = pack.avatar_url ?? room?.getMxcAvatarUrl() ?? undefined;
-    const packUsage = pack.usage ?? ['emoticon', 'sticker'];
-    const { attribution } = pack;
-    const images = new Map();
-    const emoticons = [];
-    const stickers = [];
+  constructor(eventId, content, room) {
+    this.id = eventId;
+    this.content = JSON.parse(JSON.stringify(content));
 
-    Object.entries(packContent.images).forEach(([shortcode, data]) => {
+    this.displayName = room?.name ?? undefined;
+    this.avatarUrl = room?.getMxcAvatarUrl() ?? undefined;
+
+    this.applyPack(content);
+    this.applyImages(content);
+  }
+
+  applyPack(content) {
+    const pack = content.pack ?? {};
+
+    this.displayName = pack.display_name ?? this.displayName;
+    this.avatarUrl = pack.avatar_url ?? this.avatarUrl;
+    this.usage = pack.usage ?? ['emoticon', 'sticker'];
+    this.attribution = pack.attribution;
+  }
+
+  applyImages(content) {
+    this.images = new Map();
+    this.emoticons = [];
+    this.stickers = [];
+
+    Object.entries(content.images).forEach(([shortcode, data]) => {
       const mxc = data.url;
       const body = data.body ?? shortcode;
-      const usage = data.usage ?? packUsage;
+      const usage = data.usage ?? this.usage;
       const { info } = data;
 
       if (!mxc) return;
@@ -29,44 +47,14 @@ class ImagePack {
         shortcode, mxc, body, usage, info,
       };
 
-      images.set(shortcode, image);
+      this.images.set(shortcode, image);
       if (usage.includes('emoticon')) {
-        emoticons.push(image);
+        this.emoticons.push(image);
       }
       if (usage.includes('sticker')) {
-        stickers.push(image);
+        this.stickers.push(image);
       }
     });
-
-    return new ImagePack(eventId, {
-      displayName,
-      avatarUrl,
-      usage: packUsage,
-      attribution,
-      images,
-      emoticons,
-      stickers,
-    });
-  }
-
-  constructor(id, {
-    displayName,
-    avatarUrl,
-    usage,
-    attribution,
-    images,
-    emoticons,
-    stickers,
-  }) {
-    this.id = id;
-    this.displayName = displayName;
-    this.avatarUrl = avatarUrl;
-    this.usage = usage;
-    this.attribution = attribution;
-
-    this.images = images;
-    this.emoticons = emoticons;
-    this.stickers = stickers;
   }
 
   getImages() {
@@ -80,6 +68,80 @@ class ImagePack {
   getStickers() {
     return this.stickers;
   }
+
+  getContent() {
+    return this.content;
+  }
+
+  _updatePackProperty(property, value) {
+    if (this.content.pack === undefined) {
+      this.content.pack = {};
+    }
+    this.content.pack[property] = value;
+    this.applyPack(this.content);
+  }
+
+  setAvatarUrl(avatarUrl) {
+    this._updatePackProperty('avatar_url', avatarUrl);
+  }
+
+  setDisplayName(displayName) {
+    this._updatePackProperty('display_name', displayName);
+  }
+
+  setAttribution(attribution) {
+    this._updatePackProperty('attribution', attribution);
+  }
+
+  setUsage(usage) {
+    this._updatePackProperty('usage', usage);
+  }
+
+  addImage(key, imgContent) {
+    this.content.images = {
+      [key]: imgContent,
+      ...this.content.images,
+    };
+    this.applyImages(this.content);
+  }
+
+  removeImage(key) {
+    if (this.content.images[key] === undefined) return;
+    delete this.content.images[key];
+    this.applyImages(this.content);
+  }
+
+  updateImageKey(key, newKey) {
+    if (this.content.images[key] === undefined) return;
+    const copyImages = {};
+    Object.keys(this.content.images).forEach((imgKey) => {
+      copyImages[imgKey === key ? newKey : imgKey] = this.content.images[imgKey];
+    });
+    this.content.images = copyImages;
+    this.applyImages(this.content);
+  }
+
+  _updateImageProperty(key, property, value) {
+    if (this.content.images[key] === undefined) return;
+    this.content.images[key][property] = value;
+    this.applyImages(this.content);
+  }
+
+  setImageUrl(key, url) {
+    this._updateImageProperty(key, 'url', url);
+  }
+
+  setImageBody(key, body) {
+    this._updateImageProperty(key, 'body', body);
+  }
+
+  setImageInfo(key, info) {
+    this._updateImageProperty(key, 'info', info);
+  }
+
+  setImageUsage(key, usage) {
+    this._updateImageProperty(key, 'usage', usage);
+  }
 }
 
 function getGlobalImagePacks(mx) {
@@ -112,7 +174,6 @@ function getUserImagePack(mx) {
   }
 
   const userImagePack = ImagePack.parsePack(mx.getUserId(), accountDataEmoji.event.content);
-  if (userImagePack) userImagePack.displayName ??= 'Personal Emoji';
   return userImagePack;
 }
 
diff --git a/src/client/state/RoomsInput.js b/src/client/state/RoomsInput.js
index 882c7bc0..62bddd50 100644
--- a/src/client/state/RoomsInput.js
+++ b/src/client/state/RoomsInput.js
@@ -5,21 +5,10 @@ import encrypt from 'browser-encrypt-attachment';
 import { math } from 'micromark-extension-math';
 import { getShortcodeToEmoji } from '../../app/organisms/emoji-board/custom-emoji';
 import { mathExtensionHtml, spoilerExtension, spoilerExtensionHtml } from '../../util/markdown';
+import { getImageDimension } from '../../util/common';
 import cons from './cons';
 import settings from './settings';
 
-function getImageDimension(file) {
-  return new Promise((resolve) => {
-    const img = new Image();
-    img.onload = async () => {
-      resolve({
-        w: img.width,
-        h: img.height,
-      });
-    };
-    img.src = URL.createObjectURL(file);
-  });
-}
 function loadVideo(videoFile) {
   return new Promise((resolve, reject) => {
     const video = document.createElement('video');
diff --git a/src/util/common.js b/src/util/common.js
index 3d5383ad..57891a9d 100644
--- a/src/util/common.js
+++ b/src/util/common.js
@@ -132,3 +132,62 @@ export function copyToClipboard(text) {
     copyInput.remove();
   }
 }
+
+export function suffixRename(name, validator) {
+  let suffix = 2;
+  let newName = name;
+  do {
+    newName = name + suffix;
+    suffix += 1;
+  } while (validator(newName));
+
+  return newName;
+}
+
+export function getImageDimension(file) {
+  return new Promise((resolve) => {
+    const img = new Image();
+    img.onload = async () => {
+      resolve({
+        w: img.width,
+        h: img.height,
+      });
+      URL.revokeObjectURL(img.src);
+    };
+    img.src = URL.createObjectURL(file);
+  });
+}
+
+export function scaleDownImage(imageFile, width, height) {
+  return new Promise((resolve) => {
+    const imgURL = URL.createObjectURL(imageFile);
+    const img = new Image();
+
+    img.onload = () => {
+      let newWidth = img.width;
+      let newHeight = img.height;
+
+      if (newHeight > height) {
+        newWidth = Math.floor(newWidth * (height / newHeight));
+        newHeight = height;
+      }
+      if (newWidth > width) {
+        newHeight = Math.floor(newHeight * (width / newWidth));
+        newWidth = width;
+      }
+
+      const canvas = document.createElement('canvas');
+      canvas.width = newWidth;
+      canvas.height = newHeight;
+      const ctx = canvas.getContext('2d');
+      ctx.drawImage(img, 0, 0, newWidth, newHeight);
+
+      canvas.toBlob((thumbnail) => {
+        URL.revokeObjectURL(imgURL);
+        resolve(thumbnail);
+      }, imageFile.type);
+    };
+
+    img.src = imgURL;
+  });
+}