diff --git a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedquery/MediaQueryServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedquery/MediaQueryServiceImpl.kt
index 473c5f66..7b5a5d8e 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedquery/MediaQueryServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedquery/MediaQueryServiceImpl.kt
@@ -1,17 +1,20 @@
 package dev.usbharu.hideout.core.infrastructure.exposedquery
 
-import dev.usbharu.hideout.core.domain.model.media.Media
+import dev.usbharu.hideout.core.domain.exception.FailedToGetResourcesException
+import dev.usbharu.hideout.core.infrastructure.exposedrepository.Media
 import dev.usbharu.hideout.core.infrastructure.exposedrepository.PostsMedia
 import dev.usbharu.hideout.core.infrastructure.exposedrepository.toMedia
 import dev.usbharu.hideout.core.query.MediaQueryService
+import dev.usbharu.hideout.util.singleOr
 import org.jetbrains.exposed.sql.innerJoin
 import org.jetbrains.exposed.sql.select
 import org.springframework.stereotype.Repository
+import dev.usbharu.hideout.core.domain.model.media.Media as MediaEntity
 
 @Repository
 class MediaQueryServiceImpl : MediaQueryService {
-    override suspend fun findByPostId(postId: Long): List<Media> {
-        return dev.usbharu.hideout.core.infrastructure.exposedrepository.Media.innerJoin(
+    override suspend fun findByPostId(postId: Long): List<MediaEntity> {
+        return Media.innerJoin(
             PostsMedia,
             onColumn = { id },
             otherColumn = { mediaId }
@@ -19,4 +22,10 @@ class MediaQueryServiceImpl : MediaQueryService {
             .select { PostsMedia.postId eq postId }
             .map { it.toMedia() }
     }
+
+    override suspend fun findByRemoteUrl(remoteUrl: String): MediaEntity {
+        return Media.select { Media.remoteUrl eq remoteUrl }
+            .singleOr { FailedToGetResourcesException("remoteUrl: $remoteUrl is duplicate or not exist.", it) }
+            .toMedia()
+    }
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/MediaRepositoryImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/MediaRepositoryImpl.kt
index 0206feb9..97b7c527 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/MediaRepositoryImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/MediaRepositoryImpl.kt
@@ -99,9 +99,9 @@ fun ResultRow.toMediaOrNull(): EntityMedia? {
 object Media : Table("media") {
     val id = long("id")
     val name = varchar("name", 255)
-    val url = varchar("url", 255)
-    val remoteUrl = varchar("remote_url", 255).nullable()
-    val thumbnailUrl = varchar("thumbnail_url", 255).nullable()
+    val url = varchar("url", 255).uniqueIndex()
+    val remoteUrl = varchar("remote_url", 255).uniqueIndex().nullable()
+    val thumbnailUrl = varchar("thumbnail_url", 255).uniqueIndex().nullable()
     val type = integer("type")
     val blurhash = varchar("blurhash", 255).nullable()
     val mimeType = varchar("mime_type", 255)
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/query/MediaQueryService.kt b/src/main/kotlin/dev/usbharu/hideout/core/query/MediaQueryService.kt
index fc7fb675..876c2f1e 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/query/MediaQueryService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/query/MediaQueryService.kt
@@ -4,4 +4,5 @@ import dev.usbharu.hideout.core.domain.model.media.Media
 
 interface MediaQueryService {
     suspend fun findByPostId(postId: Long): List<Media>
+    suspend fun findByRemoteUrl(remoteUrl: String): Media
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/service/media/MediaServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/service/media/MediaServiceImpl.kt
index 5337e53a..80d26318 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/service/media/MediaServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/service/media/MediaServiceImpl.kt
@@ -1,9 +1,11 @@
 package dev.usbharu.hideout.core.service.media
 
+import dev.usbharu.hideout.core.domain.exception.FailedToGetResourcesException
 import dev.usbharu.hideout.core.domain.exception.media.MediaSaveException
 import dev.usbharu.hideout.core.domain.exception.media.UnsupportedMediaException
 import dev.usbharu.hideout.core.domain.model.media.Media
 import dev.usbharu.hideout.core.domain.model.media.MediaRepository
+import dev.usbharu.hideout.core.query.MediaQueryService
 import dev.usbharu.hideout.core.service.media.converter.MediaProcessService
 import dev.usbharu.hideout.mastodon.interfaces.api.media.MediaRequest
 import dev.usbharu.hideout.util.withDelete
@@ -22,7 +24,8 @@ class MediaServiceImpl(
     private val mediaRepository: MediaRepository,
     private val mediaProcessServices: List<MediaProcessService>,
     private val remoteMediaDownloadService: RemoteMediaDownloadService,
-    private val renameService: MediaFileRenameService
+    private val renameService: MediaFileRenameService,
+    private val mediaQueryService: MediaQueryService
 ) : MediaService {
     @Suppress("LongMethod", "NestedBlockDepth")
     override suspend fun uploadLocalMedia(mediaRequest: MediaRequest): EntityMedia {
@@ -99,6 +102,13 @@ class MediaServiceImpl(
     override suspend fun uploadRemoteMedia(remoteMedia: RemoteMedia): Media {
         logger.info("MEDIA Remote media. filename:${remoteMedia.name} url:${remoteMedia.url}")
 
+        try {
+            val findByRemoteUrl = mediaQueryService.findByRemoteUrl(remoteMedia.url)
+            logger.warn("DUPLICATED Remote media is duplicated. url: {}", remoteMedia.url)
+            return findByRemoteUrl
+        } catch (_: FailedToGetResourcesException) {
+        }
+
         remoteMediaDownloadService.download(remoteMedia.url).withDelete().use {
             val mimeType = fileTypeDeterminationService.fileType(it.path, remoteMedia.name)
 
diff --git a/src/main/resources/db/migration/V1__Init_DB.sql b/src/main/resources/db/migration/V1__Init_DB.sql
index 4ea80255..e0188588 100644
--- a/src/main/resources/db/migration/V1__Init_DB.sql
+++ b/src/main/resources/db/migration/V1__Init_DB.sql
@@ -46,9 +46,9 @@ create table if not exists media
 (
     id            bigint primary key,
     "name"        varchar(255)  not null,
-    url           varchar(255)  not null,
-    remote_url    varchar(255)  null,
-    thumbnail_url varchar(255)  null,
+    url           varchar(255) not null unique,
+    remote_url    varchar(255) null unique,
+    thumbnail_url varchar(255) null unique,
     "type"        int           not null,
     blurhash      varchar(255)  null,
     mime_type     varchar(255)  not null,