diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1d533924eb..30b601641e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ ChangeLog
 unreleased
 ----------
 * アクティブユーザー数のチャートを追加
+* 管理画面でドライブのファイルをURLやIDから操作できるように
 * ログイン時に二段階認証が分かりにくいのを改善
 * 投稿のツールチップを出すのは時間の上だけに変更
 * ハッシュタグ判定の強化
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index c5301a4e76..63ed1d5956 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1216,6 +1216,10 @@ admin/views/charts.vue:
     network-usage: "通信量"
 
 admin/views/drive.vue:
+  operation: "操作"
+  fileid-or-url: "ファイルIDまたはファイルURL"
+  file-not-found: "ファイルが見つかりません"
+  lookup: "照会"
   sort:
     title: "ソート"
     createdAtAsc: "アップロード日時が古い順"
@@ -1231,6 +1235,8 @@ admin/views/drive.vue:
   deleted: "削除しました"
   mark-as-sensitive: "閲覧注意に設定"
   unmark-as-sensitive: "閲覧注意を解除"
+  marked-as-sensitive: "閲覧注意に設定しました"
+  unmarked-as-sensitive: "閲覧注意を解除しました"
 
 admin/views/users.vue:
   operation: "操作"
diff --git a/src/client/app/admin/views/drive.vue b/src/client/app/admin/views/drive.vue
index a5ce2013ea..6c2e176860 100644
--- a/src/client/app/admin/views/drive.vue
+++ b/src/client/app/admin/views/drive.vue
@@ -1,5 +1,21 @@
 <template>
 <div class="pwnqwyet">
+	<ui-card>
+		<div slot="title"><fa :icon="faTerminal"/> {{ $t('operation') }}</div>
+		<section class="fit-top">
+			<ui-input v-model="target" type="text">
+				<span>{{ $t('fileid-or-url') }}</span>
+			</ui-input>
+			<ui-horizon-group>
+				<ui-button @click="findAndToggleSensitive(true)"><fa :icon="faEyeSlash"/> {{ $t('mark-as-sensitive') }}</ui-button>
+				<ui-button @click="findAndToggleSensitive(false)"><fa :icon="faEye"/> {{ $t('unmark-as-sensitive') }}</ui-button>
+			</ui-horizon-group>
+			<ui-button @click="findAndDel()"><fa :icon="faTrashAlt"/> {{ $t('delete') }}</ui-button>
+			<ui-button @click="show()"><fa :icon="faSearch"/> {{ $t('lookup') }}</ui-button>
+			<ui-textarea v-if="file" :value="file | json5" readonly tall style="margin-top:16px;"></ui-textarea>
+		</section>
+	</ui-card>
+
 	<ui-card>
 		<div slot="title"><fa :icon="faCloud"/> {{ $t('@.drive') }}</div>
 		<section class="fit-top">
@@ -57,7 +73,7 @@
 <script lang="ts">
 import Vue from 'vue';
 import i18n from '../../i18n';
-import { faCloud } from '@fortawesome/free-solid-svg-icons';
+import { faCloud, faTerminal, faSearch } from '@fortawesome/free-solid-svg-icons';
 import { faTrashAlt, faEye, faEyeSlash } from '@fortawesome/free-regular-svg-icons';
 
 export default Vue.extend({
@@ -65,13 +81,15 @@ export default Vue.extend({
 
 	data() {
 		return {
+			file: null,
+			target: null,
 			sort: '+createdAt',
 			origin: 'combined',
 			limit: 10,
 			offset: 0,
 			files: [],
 			existMore: false,
-			faCloud, faTrashAlt, faEye, faEyeSlash
+			faCloud, faTrashAlt, faEye, faEyeSlash, faTerminal, faSearch
 		};
 	},
 
@@ -94,6 +112,24 @@ export default Vue.extend({
 	},
 
 	methods: {
+		async fetchFile() {
+			try {
+				return await this.$root.api('drive/files/show', this.target.startsWith('http') ? { url: this.target } : { fileId: this.target });
+			} catch (e) {
+				if (e == 'file-not-found') {
+					this.$root.dialog({
+						type: 'error',
+						text: this.$t('file-not-found')
+					});
+				} else {
+					this.$root.dialog({
+						type: 'error',
+						text: e.toString()
+					});
+				}
+			}
+		},
+
 		fetch() {
 			this.$root.api('admin/drive/files', {
 				origin: this.origin,
@@ -147,6 +183,52 @@ export default Vue.extend({
 
 			file.isSensitive = !file.isSensitive;
 		},
+
+		async show() {
+			const file = await this.fetchFile();
+			this.$root.api('admin/drive/show-file', { fileId: file.id }).then(info => {
+				this.file = info;
+			});
+		},
+
+		async findAndToggleSensitive(sensitive) {
+			const process = async () => {
+				const file = await this.fetchFile();
+				await this.$root.api('drive/files/update', {
+					fileId: file.id,
+					isSensitive: sensitive
+				});
+				this.$root.dialog({
+					type: 'success',
+					text: sensitive ? this.$t('marked-as-sensitive') : this.$t('unmarked-as-sensitive')
+				});
+			};
+
+			await process().catch(e => {
+				this.$root.dialog({
+					type: 'error',
+					text: e.toString()
+				});
+			});
+		},
+
+		async findAndDel() {
+			const process = async () => {
+				const file = await this.fetchFile();
+				await this.$root.api('drive/files/delete', { fileId: file.id });
+				this.$root.dialog({
+					type: 'success',
+					text: this.$t('deleted')
+				});
+			};
+
+			await process().catch(e => {
+				this.$root.dialog({
+					type: 'error',
+					text: e.toString()
+				});
+			});
+		},
 	}
 });
 </script>
diff --git a/src/server/api/endpoints/admin/drive/show-file.ts b/src/server/api/endpoints/admin/drive/show-file.ts
new file mode 100644
index 0000000000..6dfab19643
--- /dev/null
+++ b/src/server/api/endpoints/admin/drive/show-file.ts
@@ -0,0 +1,28 @@
+import $ from 'cafy';
+import ID, { transform } from '../../../../../misc/cafy-id';
+import define from '../../../define';
+import DriveFile from '../../../../../models/drive-file';
+
+export const meta = {
+	requireCredential: true,
+	requireModerator: true,
+
+	params: {
+		fileId: {
+			validator: $.type(ID),
+			transform: transform,
+		},
+	}
+};
+
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
+	const file = await DriveFile.findOne({
+		_id: ps.fileId
+	});
+
+	if (file == null) {
+		return rej('file not found');
+	}
+
+	res(file);
+}));
diff --git a/src/server/api/endpoints/drive/files/show.ts b/src/server/api/endpoints/drive/files/show.ts
index 95c3323fbb..57a22d1178 100644
--- a/src/server/api/endpoints/drive/files/show.ts
+++ b/src/server/api/endpoints/drive/files/show.ts
@@ -1,6 +1,9 @@
-import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
-import DriveFile, { pack } from '../../../../../models/drive-file';
+import $ from 'cafy';
+import * as mongo from 'mongodb';
+import ID, { transform } from '../../../../../misc/cafy-id';
+import DriveFile, { pack, IDriveFile } from '../../../../../models/drive-file';
 import define from '../../../define';
+import config from '../../../../../config';
 
 export const meta = {
 	stability: 'stable',
@@ -16,24 +19,62 @@ export const meta = {
 
 	params: {
 		fileId: {
-			validator: $.type(ID),
+			validator: $.type(ID).optional,
 			transform: transform,
 			desc: {
 				'ja-JP': '対象のファイルID',
 				'en-US': 'Target file ID'
 			}
+		},
+
+		url: {
+			validator: $.str.optional,
+			desc: {
+				'ja-JP': '対象のファイルのURL',
+				'en-US': 'Target file URL'
+			}
 		}
 	}
 };
 
 export default define(meta, (ps, user) => new Promise(async (res, rej) => {
-	// Fetch file
-	const file = await DriveFile
-		.findOne({
+	let file: IDriveFile;
+
+	if (ps.fileId) {
+		file = await DriveFile.findOne({
 			_id: ps.fileId,
-			'metadata.userId': user._id,
 			'metadata.deletedAt': { $exists: false }
 		});
+	} else if (ps.url) {
+		const isInternalStorageUrl = ps.url.startsWith(config.drive_url);
+		if (isInternalStorageUrl) {
+			// Extract file if from url
+			// e.g.
+			// http://misskey.local/files/foo?original=bar --> foo
+			const fileId = new mongo.ObjectID(ps.url.replace(config.drive_url, '').replace(/\?(.*)$/, '').replace(/\//g, ''));
+			file = await DriveFile.findOne({
+				_id: fileId,
+				'metadata.deletedAt': { $exists: false }
+			});
+		} else {
+			file = await DriveFile.findOne({
+				$or: [{
+					'metadata.url': ps.url
+				}, {
+					'metadata.webpublicUrl': ps.url
+				}, {
+					'metadata.thumbnailUrl': ps.url
+				}],
+				'metadata.deletedAt': { $exists: false }
+			});
+		}
+	} else {
+		return rej('fileId or url required');
+	}
+
+	if (!user.isAdmin && !user.isModerator && !file.metadata.userId.equals(user._id)) {
+		return rej('access denied');
+	}
 
 	if (file === null) {
 		return rej('file-not-found');