diff --git a/web/src/components/Add/AddDialog.jsx b/web/src/components/Add/AddDialog.jsx
index 937ce57..f325cb2 100644
--- a/web/src/components/Add/AddDialog.jsx
+++ b/web/src/components/Add/AddDialog.jsx
@@ -9,6 +9,9 @@ import useChangeLanguage from 'utils/useChangeLanguage'
 import { useMediaQuery } from '@material-ui/core'
 import CircularProgress from '@material-ui/core/CircularProgress'
 import usePreviousState from 'utils/usePreviousState'
+import { useQuery } from 'react-query'
+import { getTorrents } from 'utils/Utils'
+import parseTorrent from 'parse-torrent'
 
 import { checkImageURL, getMoviePosters, chechTorrentSource, parseTorrentTitle } from './helpers'
 import { ButtonWrapper, Content, Header } from './style'
@@ -31,6 +34,7 @@ export default function AddDialog({
   const [posterUrl, setPosterUrl] = useState(originalPoster || '')
   const [isPosterUrlCorrect, setIsPosterUrlCorrect] = useState(false)
   const [isTorrentSourceCorrect, setIsTorrentSourceCorrect] = useState(false)
+  const [isHashAlreadyExists, setIsHashAlreadyExists] = useState(false)
   const [posterList, setPosterList] = useState()
   const [isUserInteractedWithPoster, setIsUserInteractedWithPoster] = useState(isEditMode)
   const [currentLang] = useChangeLanguage()
@@ -40,6 +44,19 @@ export default function AddDialog({
   const [skipDebounce, setSkipDebounce] = useState(false)
   const [isCustomTitleEnabled, setIsCustomTitleEnabled] = useState(false)
 
+  const { data: torrents } = useQuery('torrents', getTorrents, {
+    retry: 1,
+    refetchInterval: 1000,
+  })
+
+  useEffect(() => {
+    const allHashes = torrents.map(({ hash }) => hash)
+
+    parseTorrent.remote(selectedFile || torrentSource, (err, { infoHash } = {}) => {
+      setIsHashAlreadyExists(allHashes.includes(infoHash))
+    })
+  }, [selectedFile, torrentSource, torrents])
+
   const fullScreen = useMediaQuery('@media (max-width:930px)')
 
   const updateTitleFromSource = useCallback(() => {
@@ -58,6 +75,7 @@ export default function AddDialog({
     if (!selectedFile && !torrentSource) {
       setTitle('')
       setOriginalTorrentTitle('')
+      setParsedTitle('')
       setIsCustomTitleEnabled(false)
       setPosterList()
       removePoster()
@@ -143,6 +161,7 @@ export default function AddDialog({
       if (parsedTitle) {
         posterSearch(parsedTitle, posterSearchLanguage)
       } else {
+        delayedPosterSearch.cancel()
         !isUserInteractedWithPoster && removePoster()
       }
     } else {
@@ -217,6 +236,7 @@ export default function AddDialog({
           setIsUserInteractedWithPoster={setIsUserInteractedWithPoster}
           setPosterList={setPosterList}
           isTorrentSourceCorrect={isTorrentSourceCorrect}
+          isHashAlreadyExists={isHashAlreadyExists}
           title={title}
           parsedTitle={parsedTitle}
           posterUrl={posterUrl}
@@ -231,6 +251,7 @@ export default function AddDialog({
           torrentSource={torrentSource}
           isCustomTitleEnabled={isCustomTitleEnabled}
           setIsCustomTitleEnabled={setIsCustomTitleEnabled}
+          isEditMode={isEditMode}
         />
       </Content>
 
@@ -242,7 +263,7 @@ export default function AddDialog({
         <Button
           variant='contained'
           style={{ minWidth: '110px' }}
-          disabled={!torrentSource}
+          disabled={!torrentSource || isHashAlreadyExists || !isTorrentSourceCorrect}
           onClick={handleSave}
           color='primary'
         >
diff --git a/web/src/components/Add/LeftSideComponent.jsx b/web/src/components/Add/LeftSideComponent.jsx
index 11c9df9..a5ceda1 100644
--- a/web/src/components/Add/LeftSideComponent.jsx
+++ b/web/src/components/Add/LeftSideComponent.jsx
@@ -50,8 +50,8 @@ export default function LeftSideComponent({
           onChange={handleTorrentSourceChange}
           value={torrentSource}
           margin='dense'
-          label={t('TorrentSourceLink')}
-          helperText={t('TorrentSourceOptions')}
+          label={t('AddDialog.TorrentSourceLink')}
+          helperText={t('AddDialog.TorrentSourceOptions')}
           type='text'
           fullWidth
           onFocus={() => setIsTorrentSourceActive(true)}
@@ -74,11 +74,11 @@ export default function LeftSideComponent({
       ) : (
         <LeftSideBottomSectionNoFile isDragActive={isDragActive} {...getRootProps()}>
           <input {...getInputProps()} />
-          <div>{t('AppendFile.Or')}</div>
+          <div>{t('AddDialog.AppendFile.Or')}</div>
 
           <IconWrapper>
             <AddItemIcon color='primary' />
-            <div>{t('AppendFile.ClickOrDrag')}</div>
+            <div>{t('AddDialog.AppendFile.ClickOrDrag')}</div>
           </IconWrapper>
         </LeftSideBottomSectionNoFile>
       )}
diff --git a/web/src/components/Add/RightSideComponent.jsx b/web/src/components/Add/RightSideComponent.jsx
index f4788b1..e8edf6c 100644
--- a/web/src/components/Add/RightSideComponent.jsx
+++ b/web/src/components/Add/RightSideComponent.jsx
@@ -22,6 +22,7 @@ export default function RightSideComponent({
   setIsUserInteractedWithPoster,
   setPosterList,
   isTorrentSourceCorrect,
+  isHashAlreadyExists,
   title,
   parsedTitle,
   posterUrl,
@@ -37,6 +38,7 @@ export default function RightSideComponent({
   updateTitleFromSource,
   isCustomTitleEnabled,
   setIsCustomTitleEnabled,
+  isEditMode,
 }) {
   const { t } = useTranslation()
 
@@ -55,14 +57,13 @@ export default function RightSideComponent({
 
   return (
     <RightSide>
-      <RightSideContainer isHidden={!isTorrentSourceCorrect}>
+      <RightSideContainer isHidden={!isTorrentSourceCorrect || (isHashAlreadyExists && !isEditMode)}>
         {originalTorrentTitle ? (
           <>
             <TextField
               value={originalTorrentTitle}
               margin='dense'
-              // label={t('Title')}
-              label='Оригинальное название торрента'
+              label={t('AddDialog.OriginalTorrentTitle')}
               type='text'
               fullWidth
               disabled={isCustomTitleEnabled}
@@ -74,7 +75,7 @@ export default function RightSideComponent({
               onBlur={({ target: { value } }) => !value && setIsCustomTitleEnabled(false)}
               value={title}
               margin='dense'
-              label='Использовать свое название (не обязательно)'
+              label={t('AddDialog.CustomTorrentTitle')}
               type='text'
               fullWidth
               InputProps={{
@@ -101,7 +102,7 @@ export default function RightSideComponent({
             onChange={handleTitleChange}
             value={title}
             margin='dense'
-            label='Использовать свое название (не обязательно)'
+            label={t('AddDialog.TitleBlank')}
             type='text'
             fullWidth
           />
@@ -110,7 +111,7 @@ export default function RightSideComponent({
           onChange={handlePosterUrlChange}
           value={posterUrl}
           margin='dense'
-          label={t('AddPosterLinkInput')}
+          label={t('AddDialog.AddPosterLinkInput')}
           type='url'
           fullWidth
         />
@@ -165,11 +166,15 @@ export default function RightSideComponent({
       </RightSideContainer>
 
       <RightSideContainer
-        isError={torrentSource && !isTorrentSourceCorrect}
+        isError={torrentSource && (!isTorrentSourceCorrect || isHashAlreadyExists)}
         notificationMessage={
-          !torrentSource ? t('AddTorrentSourceNotification') : !isTorrentSourceCorrect && t('WrongTorrentSource')
+          !torrentSource
+            ? t('AddDialog.AddTorrentSourceNotification')
+            : !isTorrentSourceCorrect
+            ? t('AddDialog.WrongTorrentSource')
+            : isHashAlreadyExists && t('AddDialog.HashExists')
         }
-        isHidden={isTorrentSourceCorrect}
+        isHidden={isEditMode || (isTorrentSourceCorrect && !isHashAlreadyExists)}
       />
     </RightSide>
   )
diff --git a/web/src/components/Add/style.js b/web/src/components/Add/style.js
index c1605f7..fd91242 100644
--- a/web/src/components/Add/style.js
+++ b/web/src/components/Add/style.js
@@ -30,6 +30,10 @@ export const Content = styled.div`
     @media (max-width: 930px) {
       grid-template-columns: 1fr;
     }
+
+    @media (max-width: 500px) {
+      align-content: start;
+    }
   `}
 `
 
@@ -66,6 +70,10 @@ export const RightSideContainer = styled.div`
     css`
       display: none;
     `};
+
+    @media (max-width: 500px) {
+      height: 170px;
+    }
   `}
 `
 export const LeftSide = styled.div`
@@ -105,6 +113,15 @@ export const LeftSideBottomSectionNoFile = styled.div`
     place-items: center;
     grid-template-rows: 40% 1fr;
   }
+
+  @media (max-width: 500px) {
+    height: 170px;
+    grid-template-rows: 1fr;
+
+    > div:first-of-type {
+      display: none;
+    }
+  }
 `
 
 export const LeftSideBottomSectionFileSelected = styled.div`
@@ -114,6 +131,10 @@ export const LeftSideBottomSectionFileSelected = styled.div`
   @media (max-width: 930px) {
     height: 400px;
   }
+
+  @media (max-width: 500px) {
+    height: 170px;
+  }
 `
 
 export const TorrentIconWrapper = styled.div`
diff --git a/web/src/components/TorrentList.jsx b/web/src/components/TorrentList.jsx
index 62887aa..b5fd512 100644
--- a/web/src/components/TorrentList.jsx
+++ b/web/src/components/TorrentList.jsx
@@ -1,21 +1,11 @@
 import { useState } from 'react'
 import { Typography } from '@material-ui/core'
-import { torrentsHost } from 'utils/Hosts'
 import TorrentCard from 'components/TorrentCard'
-import axios from 'axios'
 import CircularProgress from '@material-ui/core/CircularProgress'
 import { TorrentListWrapper, CenteredGrid } from 'components/App/style'
 import { useTranslation } from 'react-i18next'
 import { useQuery } from 'react-query'
-
-const getTorrents = async () => {
-  try {
-    const { data } = await axios.post(torrentsHost(), { action: 'list' })
-    return data
-  } catch (error) {
-    throw new Error(null)
-  }
-}
+import { getTorrents } from 'utils/Utils'
 
 export default function TorrentList() {
   const { t } = useTranslation()
diff --git a/web/src/locales/en/translation.json b/web/src/locales/en/translation.json
index 7bcc4f6..b4ded6e 100644
--- a/web/src/locales/en/translation.json
+++ b/web/src/locales/en/translation.json
@@ -2,15 +2,24 @@
   "About": "About",
   "Actions": "Actions",
   "Add": "Add",
+  "AddDialog": {
+    "AddPosterLinkInput": "Poster link",
+    "AddTorrentSourceNotification": "First add your torrent source",
+    "AppendFile": {
+      "Or": "OR",
+      "ClickOrDrag": "CLICK / DRAG & DROP (.torrent)"
+    },
+    "CustomTorrentTitle": "Custom title (optional)",
+    "HashExists": "This torrent is already in database",
+    "OriginalTorrentTitle": "Original torrent title",
+    "TitleBlank": "Title (blank for orig. torrent title)",
+    "TorrentSourceLink": "Torrent source link",
+    "TorrentSourceOptions": "magnet / hash / .torrent file link",
+    "WrongTorrentSource": "Wrong torrent source"
+  },
   "AddFromLink": "Add from Link",
   "AddNewTorrent": "Add new torrent",
-  "AddPosterLinkInput": "Poster link",
   "AddRetrackers": "Add retrackers",
-  "AddTorrentSourceNotification": "First add your torrent source",
-  "AppendFile": {
-    "Or": "OR",
-    "ClickOrDrag": "CLICK / DRAG & DROP (.torrent)"
-  },
   "Buffer": "Preload Buffer / Cache",
   "BufferNote": "Enable “Preload Buffer” in settings to see cache loading progress",
   "Cache": "Cache",
@@ -85,7 +94,6 @@
   "Support": "Support",
   "TCP": "TCP (Transmission Control Protocol)",
   "ThanksToEveryone": "Thanks to everyone who tested and helped.",
-  "Title": "Title",
   "TorrentAdded": "Added",
   "TorrentClosed": "Сlosed",
   "TorrentContent": "Torrent Content",
@@ -95,8 +103,6 @@
   "TorrentInDb": "In DB",
   "TorrentPreload": "Preload",
   "TorrentSize": "Torrent size",
-  "TorrentSourceLink": "Torrent source link",
-  "TorrentSourceOptions": "magnet / hash / .torrent file link",
   "TorrentsSavePath": "Torrents Save Path",
   "TorrentState": "Torrent State",
   "TorrentStatus": "Torrent Status",
@@ -110,6 +116,5 @@
   "UseDisk": "Use Disk for Cache",
   "UseDiskDesc": "Better use external media on flash-based devices",
   "UTP": "μTP (Micro Transport Protocol)",
-  "Viewed": "Viewed",
-  "WrongTorrentSource": "Wrong torrent source"
+  "Viewed": "Viewed"
 }
\ No newline at end of file
diff --git a/web/src/locales/ru/translation.json b/web/src/locales/ru/translation.json
index d140e05..ca93d72 100644
--- a/web/src/locales/ru/translation.json
+++ b/web/src/locales/ru/translation.json
@@ -2,15 +2,24 @@
   "About": "О сервере",
   "Actions": "Действия",
   "Add": "Добавить",
+  "AddDialog": {
+    "AddPosterLinkInput": "Ссылка на постер",
+    "AddTorrentSourceNotification": "Сначала добавьте torrent-источник",
+    "AppendFile": {
+      "Or": "ИЛИ",
+      "ClickOrDrag": "НАЖМИТЕ / ПЕРЕТАЩИТЕ ФАЙЛ (.torrent)"
+    },
+    "CustomTorrentTitle": "Cвое имя (не обязательно)",
+    "HashExists": "Этот торрент уже есть в базе данных",
+    "OriginalTorrentTitle": "Оригинальное имя торрента",
+    "TitleBlank": "Имя (пустое - ориг. имя торрента)",
+    "TorrentSourceLink": "Ссылка на источник торрента",
+    "TorrentSourceOptions": "magnet-ссылка / хеш / ссылка на .torrent файл",
+    "WrongTorrentSource": "Неправильный torrent-источник"
+  },
   "AddFromLink": "Добавить",
   "AddNewTorrent": "Добавить новый торрент",
-  "AddPosterLinkInput": "Ссылка на постер",
   "AddRetrackers": "Добавлять",
-  "AddTorrentSourceNotification": "Сначала добавьте torrent-источник",
-  "AppendFile": {
-    "Or": "ИЛИ",
-    "ClickOrDrag": "НАЖМИТЕ / ПЕРЕТАЩИТЕ ФАЙЛ (.torrent)"
-  },
   "Buffer": "Предзагрузка / Кеш",
   "BufferNote": "Включите «Наполнять кеш перед началом воспроизведения» в настройках для показа заполнения кеша",
   "Cache": "Кеш",
@@ -85,7 +94,6 @@
   "Support": "Поддержать",
   "TCP": "TCP (Transmission Control Protocol)",
   "ThanksToEveryone": "Спасибо всем, кто тестировал и помогал!",
-  "Title": "Название",
   "TorrentAdded": "Добавлен",
   "TorrentClosed": "Закрыт",
   "TorrentContent": "Содержимое торрента",
@@ -95,8 +103,6 @@
   "TorrentInDb": "Торрент в БД",
   "TorrentPreload": "Предзагрузка",
   "TorrentSize": "Размер торрента",
-  "TorrentSourceLink": "Ссылка на источник торрента",
-  "TorrentSourceOptions": "magnet-ссылка / хеш / ссылка на .torrent файл",
   "TorrentsSavePath": "Путь хранения кеша",
   "TorrentState": "Данные торрента",
   "TorrentStatus": "Состояние торрента",
@@ -110,6 +116,5 @@
   "UseDisk": "Использовать диск для кеша",
   "UseDiskDesc": "Рекомендуется использовать внешние носители на устройствах с flash-памятью",
   "UTP": "μTP (Micro Transport Protocol)",
-  "Viewed": "Просм.",
-  "WrongTorrentSource": "Неправильный torrent-источник"
+  "Viewed": "Просм."
 }
\ No newline at end of file
diff --git a/web/src/utils/Utils.js b/web/src/utils/Utils.js
index acb5c8e..aca184e 100644
--- a/web/src/utils/Utils.js
+++ b/web/src/utils/Utils.js
@@ -1,3 +1,7 @@
+import axios from 'axios'
+
+import { torrentsHost } from './Hosts'
+
 export function humanizeSize(size) {
   if (!size) return ''
   const i = Math.floor(Math.log(size) / Math.log(1024))
@@ -41,3 +45,12 @@ export const removeRedundantCharacters = string => {
 
   return hasThreeDotsAtTheEnd ? `${trimmedString}..` : trimmedString
 }
+
+export const getTorrents = async () => {
+  try {
+    const { data } = await axios.post(torrentsHost(), { action: 'list' })
+    return data
+  } catch (error) {
+    throw new Error(null)
+  }
+}