diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 3db383e37..de44d89a0 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -299,6 +299,10 @@ bannerUrl: "バナー画像のURL"
 basicInfo: "基本情報"
 pinnedUsers: "ピン留めユーザー"
 pinnedUsersDescription: "「みつける」ページなどにピン留めしたいユーザーを改行で区切って記述します。"
+hcaptcha: "hCaptcha"
+enableHcaptcha: "hCaptchaを有効にする"
+hcaptchaSiteKey: "サイトキー"
+hcaptchaSecretKey: "シークレットキー"
 recaptcha: "reCAPTCHA"
 enableRecaptcha: "reCAPTCHAを有効にする"
 recaptchaSiteKey: "サイトキー"
diff --git a/migration/1588044505511-hCaptcha.ts b/migration/1588044505511-hCaptcha.ts
new file mode 100644
index 000000000..a3f4e9367
--- /dev/null
+++ b/migration/1588044505511-hCaptcha.ts
@@ -0,0 +1,18 @@
+import {MigrationInterface, QueryRunner} from "typeorm";
+
+export class hCaptcha1588044505511 implements MigrationInterface {
+    name = 'hCaptcha1588044505511'
+
+    public async up(queryRunner: QueryRunner): Promise<void> {
+        await queryRunner.query(`ALTER TABLE "meta" ADD "enableHcaptcha" boolean NOT NULL DEFAULT false`, undefined);
+        await queryRunner.query(`ALTER TABLE "meta" ADD "hcaptchaSiteKey" character varying(64)`, undefined);
+        await queryRunner.query(`ALTER TABLE "meta" ADD "hcaptchaSecretKey" character varying(64)`, undefined);
+    }
+
+    public async down(queryRunner: QueryRunner): Promise<void> {
+        await queryRunner.query(`ALTER TABLE "meta" DROP COLUMN "hcaptchaSecretKey"`, undefined);
+        await queryRunner.query(`ALTER TABLE "meta" DROP COLUMN "hcaptchaSiteKey"`, undefined);
+        await queryRunner.query(`ALTER TABLE "meta" DROP COLUMN "enableHcaptcha"`, undefined);
+    }
+
+}
diff --git a/package.json b/package.json
index 07d88db0e..de669ee48 100644
--- a/package.json
+++ b/package.json
@@ -144,6 +144,7 @@
 		"gulp-tslint": "8.1.4",
 		"gulp-typescript": "6.0.0-alpha.1",
 		"hard-source-webpack-plugin": "0.13.1",
+		"hcaptcha": "0.0.1",
 		"html-minifier": "4.0.0",
 		"http-proxy-agent": "4.0.1",
 		"http-signature": "1.3.4",
diff --git a/src/@types/hcaptcha.d.ts b/src/@types/hcaptcha.d.ts
new file mode 100644
index 000000000..ef3d44256
--- /dev/null
+++ b/src/@types/hcaptcha.d.ts
@@ -0,0 +1,9 @@
+declare module 'hcaptcha' {
+	export function verify(secret: string, token: string): Promise<{
+		success: boolean;
+		challenge_ts: string;
+		hostname: string;
+		credit?: boolean;
+		'error-codes'?: unknown[];
+	}>;
+}
diff --git a/src/client/components/hcaptcha.vue b/src/client/components/hcaptcha.vue
new file mode 100644
index 000000000..e54eb314a
--- /dev/null
+++ b/src/client/components/hcaptcha.vue
@@ -0,0 +1,76 @@
+<template>
+	<div ref="hCaptcha"></div>
+</template>
+
+<script lang="ts">
+import Vue from 'vue';
+
+declare global {
+	interface Window {
+		hcaptcha?: {
+			render(container: string | Node, options: {
+				readonly [_ in 'sitekey' | 'theme' | 'type' | 'size' | 'tabindex' | 'callback' | 'expired' | 'expired-callback' | 'error-callback' | 'endpoint']?: unknown;
+			}): string;
+			remove(id: string): void;
+			execute(id: string): void;
+			reset(id: string): void;
+			getResponse(id: string): string;
+		};
+	}
+}
+
+export default Vue.extend({
+	props: {
+		sitekey: {
+			type: String,
+      required: true,
+		},
+		value: {
+			type: String,
+		},
+	},
+
+	data() {
+		return {
+			available: false,
+		};
+	},
+
+	created() {
+		if (window.hcaptcha) {
+			this.available = true;
+		} else {
+			const script = document.createElement('script');
+			script.addEventListener('load', () => this.available = true);
+			script.src = 'https://hcaptcha.com/1/api.js?render=explicit';
+			script.async = true;
+			document.head.appendChild(script);
+		}
+	},
+
+	mounted() {
+		if (this.available) {
+			this.render();
+		} else {
+			this.$watch('available', this.render);
+		}
+	},
+
+	methods: {
+		render() {
+			if (this.$refs.hCaptcha instanceof Element) {
+				window.hcaptcha!.render(this.$refs.hCaptcha, {
+					sitekey: this.sitekey,
+					theme: this.$store.state.device.darkMode ? 'dark' : 'light',
+					callback: this.callback,
+					'expired-callback': this.callback,
+					'error-callback': this.callback,
+				});
+			}
+		},
+		callback(response?: string) {
+			this.$emit('input', typeof response == 'string' ? response : null);
+		},
+	},
+});
+</script>
diff --git a/src/client/components/signup.vue b/src/client/components/signup.vue
index 9f3ae8db2..5d16a82ba 100644
--- a/src/client/components/signup.vue
+++ b/src/client/components/signup.vue
@@ -42,7 +42,8 @@
 			</i18n>
 		</mk-switch>
 		<div v-if="meta.enableRecaptcha" class="g-recaptcha" :data-sitekey="meta.recaptchaSiteKey" style="margin: 16px 0;"></div>
-		<mk-button type="submit" :disabled=" submitting || !(meta.tosUrl ? ToSAgreement : true) || passwordRetypeState == 'not-match'" primary>{{ $t('start') }}</mk-button>
+		<h-captcha v-if="meta.enableHcaptcha" v-model="hCaptchaResponse" :sitekey="meta.hcaptchaSiteKey"/>
+		<mk-button type="submit" :disabled="shouldDisableSubmitting" primary>{{ $t('start') }}</mk-button>
 	</template>
 </form>
 </template>
@@ -65,6 +66,7 @@ export default Vue.extend({
 		MkButton,
 		MkInput,
 		MkSwitch,
+		hCaptcha: () => import('./hcaptcha.vue').then(x => x.default),
 	},
 
 	data() {
@@ -80,6 +82,7 @@ export default Vue.extend({
 			passwordRetypeState: null,
 			submitting: false,
 			ToSAgreement: false,
+			hCaptchaResponse: null,
 			faLock, faExclamationTriangle, faSpinner, faCheck, faKey
 		}
 	},
@@ -96,7 +99,14 @@ export default Vue.extend({
 		meta() {
 			return this.$store.state.instance.meta;
 		},
-		
+
+		shouldDisableSubmitting(): boolean {
+			return this.submitting ||
+				this.meta.tosUrl && !this.ToSAgreement ||
+				this.meta.enableHcaptcha && !this.hCaptchaResponse ||
+				this.passwordRetypeState == 'not-match';
+		},
+
 		shouldShowProfileUrl(): boolean {
 			return (this.username != '' &&
 				this.usernameState != 'invalid-format' &&
@@ -115,10 +125,11 @@ export default Vue.extend({
 	},
 
 	mounted() {
-		const head = document.getElementsByTagName('head')[0];
-		const script = document.createElement('script');
-		script.setAttribute('src', 'https://www.google.com/recaptcha/api.js');
-		head.appendChild(script);
+		if (this.meta.enableRecaptcha) {
+			const script = document.createElement('script');
+			script.setAttribute('src', 'https://www.google.com/recaptcha/api.js');
+			document.head.appendChild(script);
+		}
 	},
 
 	methods: {
@@ -177,6 +188,7 @@ export default Vue.extend({
 				username: this.username,
 				password: this.password,
 				invitationCode: this.invitationCode,
+				'hcaptcha-response': this.hCaptchaResponse,
 				'g-recaptcha-response': this.meta.enableRecaptcha ? (window as any).grecaptcha.getResponse() : null
 			}).then(() => {
 				this.$root.api('signin', {
diff --git a/src/client/components/url-preview.vue b/src/client/components/url-preview.vue
index 94d07cbae..c2dd0038b 100644
--- a/src/client/components/url-preview.vue
+++ b/src/client/components/url-preview.vue
@@ -4,7 +4,7 @@
 	<iframe :src="player.url + (player.url.match(/\?/) ? '&autoplay=1&auto_play=1' : '?autoplay=1&auto_play=1')" :width="player.width || '100%'" :heigth="player.height || 250" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen />
 </div>
 <div v-else-if="tweetUrl && detail" class="twitter">
-	<blockquote ref="tweet" class="twitter-tweet" :data-theme="$store.state.device.darkmode ? 'dark' : null">
+	<blockquote ref="tweet" class="twitter-tweet" :data-theme="$store.state.device.darkMode ? 'dark' : null">
 		<a :href="url"></a>
 	</blockquote>
 </div>
diff --git a/src/client/pages/instance/settings.vue b/src/client/pages/instance/settings.vue
index f7db4aa10..088db8763 100644
--- a/src/client/pages/instance/settings.vue
+++ b/src/client/pages/instance/settings.vue
@@ -38,6 +38,24 @@
 		</div>
 	</section>
 
+	<section class="_card">
+		<div class="_title"><fa :icon="faShieldAlt"/> {{ $t('hcaptcha') }}</div>
+		<div class="_content">
+			<mk-switch v-model="enableHcaptcha">{{ $t('enableHcaptcha') }}</mk-switch>
+			<template v-if="enableHcaptcha">
+				<mk-input v-model="hcaptchaSiteKey" :disabled="!enableHcaptcha"><template #icon><fa :icon="faKey"/></template>{{ $t('hcaptchaSiteKey') }}</mk-input>
+				<mk-input v-model="hcaptchaSecretKey" :disabled="!enableHcaptcha"><template #icon><fa :icon="faKey"/></template>{{ $t('hcaptchaSecretKey') }}</mk-input>
+			</template>
+		</div>
+		<div class="_content" v-if="enableHcaptcha && hcaptchaSiteKey">
+			<header>{{ $t('preview') }}</header>
+			<h-captcha v-if="enableHcaptcha" :sitekey="hcaptchaSiteKey"/>
+		</div>
+		<div class="_footer">
+			<mk-button primary @click="save(true)"><fa :icon="faSave"/> {{ $t('save') }}</mk-button>
+		</div>
+	</section>
+
 	<section class="_card">
 		<div class="_title"><fa :icon="faShieldAlt"/> {{ $t('recaptcha') }}</div>
 		<div class="_content">
@@ -195,6 +213,12 @@ import { url } from '../../config';
 import i18n from '../../i18n';
 import getAcct from '../../../misc/acct/render';
 
+declare global {
+	interface Window {
+		onRecaptchaLoad?: Function;
+	}
+}
+
 export default Vue.extend({
 	i18n,
 
@@ -210,6 +234,7 @@ export default Vue.extend({
 		MkTextarea,
 		MkSwitch,
 		MkInfo,
+		hCaptcha: () => import('../../components/hcaptcha.vue').then(x => x.default),
 	},
 
 	data() {
@@ -234,6 +259,9 @@ export default Vue.extend({
 			enableRegistration: false,
 			enableLocalTimeline: false,
 			enableGlobalTimeline: false,
+			enableHcaptcha: false,
+			hcaptchaSiteKey: null,
+			hcaptchaSecretKey: null,
 			enableRecaptcha: false,
 			recaptchaSiteKey: null,
 			recaptchaSecretKey: null,
@@ -282,6 +310,9 @@ export default Vue.extend({
 		this.enableRegistration = !this.meta.disableRegistration;
 		this.enableLocalTimeline = !this.meta.disableLocalTimeline;
 		this.enableGlobalTimeline = !this.meta.disableGlobalTimeline;
+		this.enableHcaptcha = this.meta.enableHcaptcha;
+		this.hcaptchaSiteKey = this.meta.hcaptchaSiteKey;
+		this.hcaptchaSecretKey = this.meta.hcaptchaSecretKey;
 		this.enableRecaptcha = this.meta.enableRecaptcha;
 		this.recaptchaSiteKey = this.meta.recaptchaSiteKey;
 		this.recaptchaSecretKey = this.meta.recaptchaSecretKey;
@@ -327,24 +358,33 @@ export default Vue.extend({
 		const renderRecaptchaPreview = () => {
 			if (!(window as any).grecaptcha) return;
 			if (!this.$refs.recaptcha) return;
+			if (!this.enableRecaptcha) return;
 			if (!this.recaptchaSiteKey) return;
 			(window as any).grecaptcha.render(this.$refs.recaptcha, {
 				sitekey: this.recaptchaSiteKey
 			});
 		};
-		window.onRecaotchaLoad = () => {
-			renderRecaptchaPreview();
+		let recaptchaLoaded: boolean = false;
+		const requestRenderRecaptchaPreview = () => {
+			if (window.onRecaptchaLoad) { // loading
+				return;
+			}
+
+			if (recaptchaLoaded) { // loaded
+				delete window.onRecaptchaLoad;
+				renderRecaptchaPreview();
+			} else { // init
+				window.onRecaptchaLoad = () => {
+					recaptchaLoaded = true;
+					renderRecaptchaPreview();
+				};
+				const script = document.createElement('script');
+				script.setAttribute('src', 'https://www.google.com/recaptcha/api.js?onload=onRecaptchaLoad');
+				document.head.appendChild(script);
+			}
 		};
-		const head = document.getElementsByTagName('head')[0];
-		const script = document.createElement('script');
-		script.setAttribute('src', 'https://www.google.com/recaptcha/api.js?onload=onRecaotchaLoad');
-		head.appendChild(script);
-		this.$watch('enableRecaptcha', () => {
-			renderRecaptchaPreview();
-		});
-		this.$watch('recaptchaSiteKey', () => {
-			renderRecaptchaPreview();
-		});
+		this.$watch('enableRecaptcha', requestRenderRecaptchaPreview);
+		this.$watch('recaptchaSiteKey', requestRenderRecaptchaPreview);
 	},
 
 	methods: {
@@ -391,6 +431,9 @@ export default Vue.extend({
 				disableRegistration: !this.enableRegistration,
 				disableLocalTimeline: !this.enableLocalTimeline,
 				disableGlobalTimeline: !this.enableGlobalTimeline,
+				enableHcaptcha: this.enableHcaptcha,
+				hcaptchaSiteKey: this.hcaptchaSiteKey,
+				hcaptchaSecretKey: this.hcaptchaSecretKey,
 				enableRecaptcha: this.enableRecaptcha,
 				recaptchaSiteKey: this.recaptchaSiteKey,
 				recaptchaSecretKey: this.recaptchaSecretKey,
diff --git a/src/models/entities/meta.ts b/src/models/entities/meta.ts
index bb463c52f..622d28bea 100644
--- a/src/models/entities/meta.ts
+++ b/src/models/entities/meta.ts
@@ -124,6 +124,23 @@ export class Meta {
 	@JoinColumn()
 	public proxyAccount: User | null;
 
+	@Column('boolean', {
+		default: false,
+	})
+	public enableHcaptcha: boolean;
+
+	@Column('varchar', {
+		length: 64,
+		nullable: true
+	})
+	public hcaptchaSiteKey: string | null;
+
+	@Column('varchar', {
+		length: 64,
+		nullable: true
+	})
+	public hcaptchaSecretKey: string | null;
+
 	@Column('boolean', {
 		default: false,
 	})
diff --git a/src/server/api/endpoints/admin/update-meta.ts b/src/server/api/endpoints/admin/update-meta.ts
index 1bc20029e..dffe7ffe7 100644
--- a/src/server/api/endpoints/admin/update-meta.ts
+++ b/src/server/api/endpoints/admin/update-meta.ts
@@ -145,6 +145,27 @@ export const meta = {
 			}
 		},
 
+		enableHcaptcha: {
+			validator: $.optional.bool,
+			desc: {
+				'ja-JP': 'hCaptchaを使用するか否か'
+			}
+		},
+
+		hcaptchaSiteKey: {
+			validator: $.optional.nullable.str,
+			desc: {
+				'ja-JP': 'hCaptcha site key'
+			}
+		},
+
+		hcaptchaSecretKey: {
+			validator: $.optional.nullable.str,
+			desc: {
+				'ja-JP': 'hCaptcha secret key'
+			}
+		},
+
 		enableRecaptcha: {
 			validator: $.optional.bool,
 			desc: {
@@ -472,6 +493,18 @@ export default define(meta, async (ps, me) => {
 		set.proxyRemoteFiles = ps.proxyRemoteFiles;
 	}
 
+	if (ps.enableHcaptcha !== undefined) {
+		set.enableHcaptcha = ps.enableHcaptcha;
+	}
+
+	if (ps.hcaptchaSiteKey !== undefined) {
+		set.hcaptchaSiteKey = ps.hcaptchaSiteKey;
+	}
+
+	if (ps.hcaptchaSecretKey !== undefined) {
+		set.hcaptchaSecretKey = ps.hcaptchaSecretKey;
+	}
+
 	if (ps.enableRecaptcha !== undefined) {
 		set.enableRecaptcha = ps.enableRecaptcha;
 	}
diff --git a/src/server/api/endpoints/meta.ts b/src/server/api/endpoints/meta.ts
index 179355489..eefc37012 100644
--- a/src/server/api/endpoints/meta.ts
+++ b/src/server/api/endpoints/meta.ts
@@ -122,6 +122,8 @@ export default define(meta, async (ps, me) => {
 		driveCapacityPerRemoteUserMb: instance.remoteDriveCapacityMb,
 		cacheRemoteFiles: instance.cacheRemoteFiles,
 		proxyRemoteFiles: instance.proxyRemoteFiles,
+		enableHcaptcha: instance.enableHcaptcha,
+		hcaptchaSiteKey: instance.hcaptchaSiteKey,
 		enableRecaptcha: instance.enableRecaptcha,
 		recaptchaSiteKey: instance.recaptchaSiteKey,
 		swPublickey: instance.swPublicKey,
@@ -149,6 +151,7 @@ export default define(meta, async (ps, me) => {
 			localTimeLine: !instance.disableLocalTimeline,
 			globalTimeLine: !instance.disableGlobalTimeline,
 			elasticsearch: config.elasticsearch ? true : false,
+			hcaptcha: instance.enableHcaptcha,
 			recaptcha: instance.enableRecaptcha,
 			objectStorage: instance.useObjectStorage,
 			twitter: instance.enableTwitterIntegration,
@@ -164,6 +167,7 @@ export default define(meta, async (ps, me) => {
 		response.pinnedUsers = instance.pinnedUsers;
 		response.hiddenTags = instance.hiddenTags;
 		response.blockedHosts = instance.blockedHosts;
+		response.hcaptchaSecretKey = instance.hcaptchaSecretKey;
 		response.recaptchaSecretKey = instance.recaptchaSecretKey;
 		response.proxyAccountId = instance.proxyAccountId;
 		response.twitterConsumerKey = instance.twitterConsumerKey;
diff --git a/src/server/api/private/signup.ts b/src/server/api/private/signup.ts
index 79ee74389..e23fe4358 100644
--- a/src/server/api/private/signup.ts
+++ b/src/server/api/private/signup.ts
@@ -1,5 +1,6 @@
 import * as Koa from 'koa';
 import { fetchMeta } from '../../../misc/fetch-meta';
+import { verify } from 'hcaptcha';
 import * as recaptcha from 'recaptcha-promise';
 import { Users, RegistrationTickets } from '../../../models';
 import { signup } from '../common/signup';
@@ -9,8 +10,18 @@ export default async (ctx: Koa.Context) => {
 
 	const instance = await fetchMeta(true);
 
-	// Verify recaptcha
+	// Verify *Captcha
 	// ただしテスト時はこの機構は障害となるため無効にする
+	if (process.env.NODE_ENV !== 'test' && instance.enableHcaptcha && instance.hcaptchaSecretKey) {
+		const success = await verify(instance.hcaptchaSecretKey, body['hcaptcha-response']).then(
+			({ 'error-codes': x }) => !x || !x.length,
+			() => false,
+		);
+
+		if (!success) {
+			ctx.throw(400, 'hcaptcha-failed');
+		}
+	}
 	if (process.env.NODE_ENV !== 'test' && instance.enableRecaptcha && instance.recaptchaSecretKey) {
 		recaptcha.init({
 			secret_key: instance.recaptchaSecretKey
diff --git a/src/server/nodeinfo.ts b/src/server/nodeinfo.ts
index 2ff924e68..442e946df 100644
--- a/src/server/nodeinfo.ts
+++ b/src/server/nodeinfo.ts
@@ -65,6 +65,7 @@ const nodeinfo2 = async () => {
 			disableRegistration: meta.disableRegistration,
 			disableLocalTimeline: meta.disableLocalTimeline,
 			disableGlobalTimeline: meta.disableGlobalTimeline,
+			enableHcaptcha: meta.enableHcaptcha,
 			enableRecaptcha: meta.enableRecaptcha,
 			maxNoteTextLength: meta.maxNoteTextLength,
 			enableTwitterIntegration: meta.enableTwitterIntegration,
diff --git a/src/server/web/views/info.pug b/src/server/web/views/info.pug
index 992e652a6..4553d2e2b 100644
--- a/src/server/web/views/info.pug
+++ b/src/server/web/views/info.pug
@@ -106,6 +106,9 @@ html
 				tr
 					th Registration
 					td= !meta.disableRegistration ? 'yes' : 'no'
+				tr
+					th hCaptcha enabled
+					td= meta.enableHcaptcha ? 'enabled' : 'disabled'
 				tr
 					th reCAPTCHA enabled
 					td= meta.enableRecaptcha ? 'enabled' : 'disabled'
diff --git a/yarn.lock b/yarn.lock
index 07fe0f88d..1958dde9f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4302,6 +4302,11 @@ hash-sum@^1.0.2:
   resolved "https://registry.yarnpkg.com/hash-sum/-/hash-sum-1.0.2.tgz#33b40777754c6432573c120cc3808bbd10d47f04"
   integrity sha1-M7QHd3VMZDJXPBIMw4CLvRDUfwQ=
 
+hcaptcha@0.0.1:
+  version "0.0.1"
+  resolved "https://registry.yarnpkg.com/hcaptcha/-/hcaptcha-0.0.1.tgz#e8c5e25a943083d06630bf077bae8a3053fa3da5"
+  integrity sha512-xGU7wSg3BENwEsOplfMghyR7SL/AXKllmCRMkmt3WQHxhINVNs2u7pP7V5FhigNFBNt6zz32GDRzLqfeDzqPyA==
+
 he@1.2.0, he@^1.1.0, he@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/he/-/he-1.2.0.tgz#84ae65fa7eafb165fddb61566ae14baf05664f0f"