diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index bf23e4470586a2d2a112b54cbd12113668286058..d2776c45b1b7983c4615470b30a9c77ff4b25f49 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -129,6 +129,7 @@ common:
     add-visible-user: "ユーザーを追加"
     cw-placeholder: "内容への注釈 (オプション)"
     username-prompt: "ユーザー名を入力してください"
+    enter-file-name: "ファイル名を編集"
 
   weekday-short:
     sunday: "æ—¥"
@@ -201,6 +202,11 @@ common:
     remember-note-visibility: "投稿の公開範囲を記憶する"
     web-search-engine: "ウェブ検索エンジン"
     web-search-engine-desc: "例: https://www.google.com/?#q={{query}}"
+    paste: "ペースト"
+    pasted-file-name: "ペーストされたファイル名のテンプレート"
+    pasted-file-name-desc: "例: \"yyyy-MM-dd HH-mm-ss [{{number}}]\" → \"2018-03-20 21-30-24 1\""
+    paste-dialog: "ペースト時にファイル名を編集"
+    paste-dialog-desc: "ペースト時にファイル名を編集するダイアログを表示するようにします。"
     keep-cw: "CW保持"
     keep-cw-desc: "投稿にリプライする際、リプライ元の投稿にCWが設定されていたとき、デフォルトで同じCWを設定するようにします。"
     i-like-sushi: "私は(プリンよりむしろ)寿司が好き"
diff --git a/src/client/app/common/scripts/post-form.ts b/src/client/app/common/scripts/post-form.ts
index 1d93b4c26884e39b62d52c7d1bc8000fbe99d8a2..7cf26f65bf6e0e49f84c5d065d2998a82add4832 100644
--- a/src/client/app/common/scripts/post-form.ts
+++ b/src/client/app/common/scripts/post-form.ts
@@ -8,6 +8,7 @@ import { host, url } from '../../config';
 import i18n from '../../i18n';
 import { erase, unique } from '../../../../prelude/array';
 import extractMentions from '../../../../misc/extract-mentions';
+import { formatTimeString } from '../../../../misc/format-time-string';
 
 export default (opts) => ({
 	i18n: i18n(),
@@ -244,8 +245,8 @@ export default (opts) => ({
 			for (const x of Array.from((this.$refs.file as any).files)) this.upload(x);
 		},
 
-		upload(file) {
-			(this.$refs.uploader as any).upload(file, this.$store.state.settings.uploadFolder);
+		upload(file: File, name?: string) {
+			(this.$refs.uploader as any).upload(file, this.$store.state.settings.uploadFolder, name);
 		},
 
 		onChangeUploadings(uploads) {
@@ -334,10 +335,23 @@ export default (opts) => ({
 			if ((e.which == 10 || e.which == 13) && (e.ctrlKey || e.metaKey) && this.canPost) this.post();
 		},
 
-		async onPaste(e) {
-			for (const item of Array.from(e.clipboardData.items)) {
+		async onPaste(e: ClipboardEvent) {
+			for (const { item, i } of Array.from(e.clipboardData.items).map((item, i) => ({item, i}))) {
 				if (item.kind == 'file') {
-					this.upload(item.getAsFile());
+					const file = item.getAsFile();
+					const lio = file.name.lastIndexOf('.');
+					const ext = lio >= 0 ? file.name.slice(lio) : '';
+					const formatted = `${formatTimeString(new Date(file.lastModified), this.$store.state.settings.pastedFileName).replace(/{{number}}/g, `${i + 1}`)}${ext}`;
+					const name = this.$store.state.settings.pasteDialog
+						? await this.$root.dialog({
+								title: this.$t('@.post-form.enter-file-name'),
+								input: {
+									default: formatted
+								},
+								allowEmpty: false
+							}).then(({ canceled, result }) => canceled ? false : result)
+						: formatted;
+					if (name) this.upload(file, name);
 				}
 			}
 
diff --git a/src/client/app/common/views/components/messaging-room.form.vue b/src/client/app/common/views/components/messaging-room.form.vue
index 74e30d29e87aad5683049f31482ef7499e1633ff..bd63bab2c1c8074ca51556f559f0b3291d1b573d 100644
--- a/src/client/app/common/views/components/messaging-room.form.vue
+++ b/src/client/app/common/views/components/messaging-room.form.vue
@@ -30,6 +30,7 @@
 import Vue from 'vue';
 import i18n from '../../../i18n';
 import * as autosize from 'autosize';
+import { formatTimeString } from '../../../../../misc/format-time-string';
 
 export default Vue.extend({
 	i18n: i18n('common/views/components/messaging-room.form.vue'),
@@ -84,13 +85,26 @@ export default Vue.extend({
 		}
 	},
 	methods: {
-		onPaste(e) {
+		async onPaste(e: ClipboardEvent) {
 			const data = e.clipboardData;
 			const items = data.items;
 
 			if (items.length == 1) {
 				if (items[0].kind == 'file') {
-					this.upload(items[0].getAsFile());
+					const file = items[0].getAsFile();
+					const lio = file.name.lastIndexOf('.');
+					const ext = lio >= 0 ? file.name.slice(lio) : '';
+					const formatted = `${formatTimeString(new Date(file.lastModified), this.$store.state.settings.pastedFileName).replace(/{{number}}/g, '1')}${ext}`;
+					const name = this.$store.state.settings.pasteDialog
+						? await this.$root.dialog({
+							title: this.$t('@.post-form.enter-file-name'),
+							input: {
+								default: formatted
+							},
+							allowEmpty: false
+						}).then(({ canceled, result }) => canceled ? false : result)
+						: formatted;
+					if (name) this.upload(file, name);
 				}
 			} else {
 				if (items[0].kind == 'file') {
@@ -157,8 +171,8 @@ export default Vue.extend({
 			this.upload((this.$refs.file as any).files[0]);
 		},
 
-		upload(file) {
-			(this.$refs.uploader as any).upload(file, this.$store.state.settings.uploadFolder);
+		upload(file: File, name?: string) {
+			(this.$refs.uploader as any).upload(file, this.$store.state.settings.uploadFolder, name);
 		},
 
 		onUploaded(file) {
diff --git a/src/client/app/common/views/components/settings/settings.vue b/src/client/app/common/views/components/settings/settings.vue
index 5f370c8be7da51a261589f1716329507b7b07e8a..281524979e5daa39081c8c4e891fb7dc67ff4cce 100644
--- a/src/client/app/common/views/components/settings/settings.vue
+++ b/src/client/app/common/views/components/settings/settings.vue
@@ -140,7 +140,19 @@
 
 			<section>
 				<header>{{ $t('@._settings.web-search-engine') }}</header>
-				<ui-input v-model="webSearchEngine">{{ $t('@._settings.web-search-engine') }}<template #desc>{{ $t('@._settings.web-search-engine-desc') }}</template></ui-input>
+				<ui-input v-model="webSearchEngine">{{ $t('@._settings.web-search-engine') }}
+					<template #desc>{{ $t('@._settings.web-search-engine-desc') }}</template>
+				</ui-input>
+			</section>
+
+			<section v-if="!$root.isMobile">
+				<header>{{ $t('@._settings.paste') }}</header>
+				<ui-input v-model="pastedFileName">{{ $t('@._settings.pasted-file-name') }}
+					<template #desc>{{ $t('@._settings.pasted-file-name-desc') }}</template>
+				</ui-input>
+				<ui-switch v-model="pasteDialog">{{ $t('@._settings.paste-dialog') }}
+					<template #desc>{{ $t('@._settings.paste-dialog-desc') }}</template>
+				</ui-switch>
 			</section>
 		</ui-card>
 
@@ -412,6 +424,16 @@ export default Vue.extend({
 			set(value) { this.$store.dispatch('settings/set', { key: 'webSearchEngine', value }); }
 		},
 
+		pastedFileName: {
+			get() { return this.$store.state.settings.pastedFileName; },
+			set(value) { this.$store.dispatch('settings/set', { key: 'pastedFileName', value }); }
+		},
+
+		pasteDialog: {
+			get() { return this.$store.state.settings.pasteDialog; },
+			set(value) { this.$store.dispatch('settings/set', { key: 'pasteDialog', value }); }
+		},
+
 		showReplyTarget: {
 			get() { return this.$store.state.settings.showReplyTarget; },
 			set(value) { this.$store.dispatch('settings/set', { key: 'showReplyTarget', value }); }
diff --git a/src/client/app/common/views/components/uploader.vue b/src/client/app/common/views/components/uploader.vue
index 78fbcbf6b8ad6607811bc7c5ad49cf5c1aaffff9..9f02da6c1e5a48ca5df0dab5880eed4b66586094 100644
--- a/src/client/app/common/views/components/uploader.vue
+++ b/src/client/app/common/views/components/uploader.vue
@@ -46,7 +46,7 @@ export default Vue.extend({
 			});
 		},
 
-		upload(file: File, folder: any) {
+		upload(file: File, folder: any, name?: string) {
 			if (folder && typeof folder == 'object') folder = folder.id;
 
 			const id = Math.random();
@@ -61,7 +61,7 @@ export default Vue.extend({
 
 					const ctx = {
 						id: id,
-						name: file.name || 'untitled',
+						name: name || file.name || 'untitled',
 						progress: undefined,
 						img: window.URL.createObjectURL(file)
 					};
@@ -75,6 +75,7 @@ export default Vue.extend({
 					data.append('file', file);
 
 					if (folder) data.append('folderId', folder);
+					if (name) data.append('name', name);
 
 					const xhr = new XMLHttpRequest();
 					xhr.open('POST', apiUrl + '/drive/files/create', true);
diff --git a/src/client/app/common/views/widgets/post-form.vue b/src/client/app/common/views/widgets/post-form.vue
index 5e577c9a434158684a4f996d29d2f58b265a2ae9..6680a114356598b38c7687c4fadce19203969393 100644
--- a/src/client/app/common/views/widgets/post-form.vue
+++ b/src/client/app/common/views/widgets/post-form.vue
@@ -38,6 +38,7 @@
 import define from '../../../common/define-widget';
 import i18n from '../../../i18n';
 import insertTextAtCursor from 'insert-text-at-cursor';
+import { formatTimeString } from '../../../../../misc/format-time-string';
 
 export default define({
 	name: 'post-form',
@@ -109,10 +110,23 @@ export default define({
 			if ((e.which == 10 || e.which == 13) && (e.ctrlKey || e.metaKey) && !this.posting && this.text) this.post();
 		},
 
-		onPaste(e) {
-			for (const item of Array.from(e.clipboardData.items)) {
+		async onPaste(e: ClipboardEvent) {
+			for (const { item, i } of Array.from(e.clipboardData.items).map((item, i) => ({item, i}))) {
 				if (item.kind == 'file') {
-					this.upload(item.getAsFile());
+					const file = item.getAsFile();
+					const lio = file.name.lastIndexOf('.');
+					const ext = lio >= 0 ? file.name.slice(lio) : '';
+					const formatted = `${formatTimeString(new Date(file.lastModified), this.$store.state.settings.pastedFileName).replace(/{{number}}/g, `${i + 1}`)}${ext}`;
+					const name = this.$store.state.settings.pasteDialog
+						? await this.$root.dialog({
+								title: this.$t('@.post-form.enter-file-name'),
+								input: {
+									default: formatted
+								},
+								allowEmpty: false
+							}).then(({ canceled, result }) => canceled ? false : result)
+						: formatted;
+					if (name) this.upload(file, name);
 				}
 			}
 		},
@@ -121,8 +135,8 @@ export default define({
 			for (const x of Array.from((this.$refs.file as any).files)) this.upload(x);
 		},
 
-		upload(file) {
-			(this.$refs.uploader as any).upload(file, this.$store.state.settings.uploadFolder);
+		upload(file: File, name?: string) {
+			(this.$refs.uploader as any).upload(file, this.$store.state.settings.uploadFolder, name);
 		},
 
 		onDragover(e) {
diff --git a/src/client/app/store.ts b/src/client/app/store.ts
index 252feb3982785202c1ff691e0dc933d80fcbc221..18137c1ca91b09b5e7f189a51c8e38afe50db825 100644
--- a/src/client/app/store.ts
+++ b/src/client/app/store.ts
@@ -39,6 +39,8 @@ const defaultSettings = {
 	mobileHomeProfiles: {},
 	deckProfiles: {},
 	uploadFolder: null,
+	pastedFileName: 'yyyy-MM-dd HH-mm-ss [{{number}}]',
+	pasteDialog: false,
 };
 
 const defaultDeviceSettings = {
diff --git a/src/misc/format-time-string.ts b/src/misc/format-time-string.ts
new file mode 100644
index 0000000000000000000000000000000000000000..4729036e5b5d4d49fc39bb8f1d1ba03c6d386832
--- /dev/null
+++ b/src/misc/format-time-string.ts
@@ -0,0 +1,50 @@
+const defaultLocaleStringFormats: {[index: string]: string} = {
+	'weekday': 'narrow',
+	'era': 'narrow',
+	'year': 'numeric',
+	'month': 'numeric',
+	'day': 'numeric',
+	'hour': 'numeric',
+	'minute': 'numeric',
+	'second': 'numeric',
+	'timeZoneName': 'short'
+};
+
+function formatLocaleString(date: Date, format: string): string {
+	return format.replace(/\{\{(\w+)(:(\w+))?\}\}/g, (match: string, kind: string, unused?, option?: string) => {
+		if (['weekday', 'era', 'year', 'month', 'day', 'hour', 'minute', 'second', 'timeZoneName'].includes(kind)) {
+			return date.toLocaleString(window.navigator.language, {[kind]: option ? option : defaultLocaleStringFormats[kind]});
+		} else {
+			return match;
+		}
+	});
+}
+
+function formatDateTimeString(date: Date, format: string): string {
+	return format
+		.replace(/yyyy/g, date.getFullYear().toString())
+		.replace(/yy/g, date.getFullYear().toString().slice(-2))
+		.replace(/MMMM/g, date.toLocaleString(window.navigator.language, { month: 'long'}))
+		.replace(/MMM/g, date.toLocaleString(window.navigator.language, { month: 'short'}))
+		.replace(/MM/g, (`0${date.getMonth() + 1}`).slice(-2))
+		.replace(/M/g, (date.getMonth() + 1).toString())
+		.replace(/dd/g, (`0${date.getDate()}`).slice(-2))
+		.replace(/d/g, date.getDate().toString())
+		.replace(/HH/g, (`0${date.getHours()}`).slice(-2))
+		.replace(/H/g, date.getHours().toString())
+		.replace(/hh/g, (`0${(date.getHours() % 12) || 12}`).slice(-2))
+		.replace(/h/g, ((date.getHours() % 12) || 12).toString())
+		.replace(/mm/g, (`0${date.getMinutes()}`).slice(-2))
+		.replace(/m/g, date.getMinutes().toString())
+		.replace(/ss/g, (`0${date.getSeconds()}`).slice(-2))
+		.replace(/s/g, date.getSeconds().toString())
+		.replace(/tt/g, date.getHours() >= 12 ? 'PM' : 'AM');
+}
+
+export function formatTimeString(date: Date, format: string): string {
+	return format.replace(/\[(([^\[]|\[\])*)\]|([yMdHhmst]{1,4})/g, (match: string, localeformat?: string, unused?, datetimeformat?: string) => {
+		if (localeformat) return formatLocaleString(date, localeformat);
+		if (datetimeformat) return formatDateTimeString(date, datetimeformat);
+		return match;
+	});
+}
diff --git a/src/server/api/endpoints/drive/files/create.ts b/src/server/api/endpoints/drive/files/create.ts
index 664a2b87b2e80fb6d795d9e06411c33d3c596f7f..61055c5d18685c9777503a06e4ac7c1d2705f041 100644
--- a/src/server/api/endpoints/drive/files/create.ts
+++ b/src/server/api/endpoints/drive/files/create.ts
@@ -35,6 +35,14 @@ export const meta = {
 			}
 		},
 
+		name: {
+			validator: $.optional.nullable.str,
+			default: null as any,
+			desc: {
+				'ja-JP': 'ファイル名（拡張子があるなら含めて）'
+			}
+		},
+
 		isSensitive: {
 			validator: $.optional.either($.bool, $.str),
 			default: false,
@@ -72,7 +80,7 @@ export const meta = {
 
 export default define(meta, async (ps, user, app, file, cleanup) => {
 	// Get 'name' parameter
-	let name = file.originalname;
+	let name = ps.name || file.originalname;
 	if (name !== undefined && name !== null) {
 		name = name.trim();
 		if (name.length === 0) {
diff --git a/test/api.ts b/test/api.ts
index 570ab6833d14962ef2f82e1d0d701dabf5dc7083..343112b4aac1c98928e25dab12696a99bc22eba6 100644
--- a/test/api.ts
+++ b/test/api.ts
@@ -474,6 +474,20 @@ describe('API', () => {
 			assert.strictEqual(res.body.name, 'Lenna.png');
 		}));
 
+		it('ファイルに名前を付けられる', async(async () => {
+			const alice = await signup({ username: 'alice' });
+
+			const res = await assert.request(server)
+				.post('/drive/files/create')
+				.field('i', alice.token)
+				.field('name', 'Belmond.png')
+				.attach('file', fs.readFileSync(__dirname + '/resources/Lenna.png'), 'Lenna.png');
+
+			expect(res).have.status(200);
+			expect(res.body).be.a('object');
+			expect(res.body).have.property('name').eql('Belmond.png');
+		}));
+
 		it('ファイル無しで怒られる', async(async () => {
 			const alice = await signup({ username: 'alice' });