diff --git a/locales/en-US.yml b/locales/en-US.yml
index 7a452e1c52..a231f22716 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -464,6 +464,8 @@ enable: "Enable"
 next: "Next"
 retype: "Enter again"
 noteOf: "Note by {user}"
+expandAllCws: "Show content for all replies"
+collapseAllCws: "Hide content for all replies"
 quoteAttached: "Quote"
 quoteQuestion: "Append as quote?"
 noMessagesYet: "No messages yet"
diff --git a/locales/index.d.ts b/locales/index.d.ts
index 90825836cb..fd9a2cb7e0 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -462,6 +462,8 @@ export interface Locale {
     "next": string;
     "retype": string;
     "noteOf": string;
+    "expandAllCws": string;
+    "collapseAllCws": string;
     "quoteAttached": string;
     "quoteQuestion": string;
     "noMessagesYet": string;
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 8433313cad..deab375c1a 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -459,6 +459,8 @@ enable: "有効にする"
 next: "次"
 retype: "再入力"
 noteOf: "{user}のノート"
+expandAllCws: "すべての返信の内容を表示する"
+collapseAllCws: "すべての返信の内容を隠す"
 quoteAttached: "引用付き"
 quoteQuestion: "引用として添付しますか？"
 noMessagesYet: "まだチャットはありません"
diff --git a/packages/frontend/src/components/MkNoteDetailed.vue b/packages/frontend/src/components/MkNoteDetailed.vue
index e39c2ad156..5f204fe3c4 100644
--- a/packages/frontend/src/components/MkNoteDetailed.vue
+++ b/packages/frontend/src/components/MkNoteDetailed.vue
@@ -15,9 +15,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<div v-if="!conversationLoaded" style="padding: 16px">
 			<MkButton style="margin: 0 auto;" primary rounded @click="loadConversation">{{ i18n.ts.loadConversation }}</MkButton>
 		</div>
-		<MkNoteSub v-for="note in conversation" :key="note.id" :class="$style.replyToMore" :note="note"/>
+		<MkNoteSub v-for="note in conversation" :key="note.id" :class="$style.replyToMore" :note="note" :expandAllCws="props.expandAllCws"/>
 	</div>
-	<MkNoteSub v-if="appearNote.reply" :note="appearNote.reply" :class="$style.replyTo"/>
+	<MkNoteSub v-if="appearNote.reply" :note="appearNote.reply" :class="$style.replyTo" :expandAllCws="props.expandAllCws"/>
 	<div v-if="isRenote" :class="$style.renote">
 		<MkAvatar :class="$style.renoteAvatar" :user="note.user" link preview/>
 		<i class="ph-rocket-launch ph-bold ph-lg" style="margin-right: 4px;"></i>
@@ -88,7 +88,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				</div>
 				<MkPoll v-if="appearNote.poll" ref="pollViewer" :note="appearNote" :class="$style.poll"/>
 				<MkUrlPreview v-for="url in urls" :key="url" :url="url" :compact="true" :detail="true" style="margin-top: 6px;"/>
-				<div v-if="appearNote.renote" :class="$style.quote"><MkNoteSimple :note="appearNote.renote" :class="$style.quoteNote"/></div>
+				<div v-if="appearNote.renote" :class="$style.quote"><MkNoteSimple :note="appearNote.renote" :class="$style.quoteNote" :expandAllCws="props.expandAllCws"/></div>
 			</div>
 			<MkA v-if="appearNote.channel && !inChannel" :class="$style.channel" :to="`/channels/${appearNote.channel.id}`"><i class="ph-television ph-bold ph-lg"></i> {{ appearNote.channel.name }}</MkA>
 		</div>
@@ -159,7 +159,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<div v-if="!repliesLoaded" style="padding: 16px">
 				<MkButton style="margin: 0 auto;" primary rounded @click="loadReplies">{{ i18n.ts.loadReplies }}</MkButton>
 			</div>
-			<MkNoteSub v-for="note in replies" :key="note.id" :note="note" :class="$style.reply" :detail="true"/>
+			<MkNoteSub v-for="note in replies" :key="note.id" :note="note" :class="$style.reply" :detail="true" :expandAllCws="props.expandAllCws"/>
 		</div>
 		<div v-else-if="tab === 'renotes'" :class="$style.tab_renotes">
 			<MkPagination :pagination="renotesPagination" :disableAutoLoad="true">
@@ -176,7 +176,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<div v-if="!quotesLoaded" style="padding: 16px">
 				<MkButton style="margin: 0 auto;" primary rounded @click="loadQuotes">{{ i18n.ts.loadReplies }}</MkButton>
 			</div>
-			<MkNoteSub v-for="note in quotes" :key="note.id" :note="note" :class="$style.reply" :detail="true"/>
+			<MkNoteSub v-for="note in quotes" :key="note.id" :note="note" :class="$style.reply" :detail="true" :expandAllCws="props.expandAllCws"/>
 		</div>
 		<div v-else-if="tab === 'reactions'" :class="$style.tab_reactions">
 			<div :class="$style.reactionTabs">
@@ -209,7 +209,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, inject, onMounted, ref, shallowRef } from 'vue';
+import { computed, inject, onMounted, ref, shallowRef, watch } from 'vue';
 import * as mfm from 'mfm-js';
 import * as Misskey from 'misskey-js';
 import MkNoteSub from '@/components/MkNoteSub.vue';
@@ -246,6 +246,7 @@ import MkButton from '@/components/MkButton.vue';
 
 const props = defineProps<{
 	note: Misskey.entities.Note;
+	expandAllCws?: boolean;
 }>();
 
 const inChannel = inject('inChannel', null);
@@ -297,6 +298,10 @@ const replies = ref<Misskey.entities.Note[]>([]);
 const quotes = ref<Misskey.entities.Note[]>([]);
 const canRenote = computed(() => ['public', 'home'].includes(appearNote.visibility) || appearNote.userId === $i.id);
 
+watch(() => props.expandAllCws, (expandAllCws) => {
+	if (expandAllCws !== showContent.value) showContent.value = expandAllCws;
+});
+
 if ($i) {
 	os.api("notes/renotes", {
 		noteId: appearNote.id,
@@ -305,7 +310,7 @@ if ($i) {
 	}).then((res) => {
 		renoted.value = res.length > 0;
 	});
-	
+
 	os.api("notes/renotes", {
 		noteId: appearNote.id,
 		userId: $i.id,
diff --git a/packages/frontend/src/components/MkNoteSimple.vue b/packages/frontend/src/components/MkNoteSimple.vue
index b7da548e9d..db5e26e5da 100644
--- a/packages/frontend/src/components/MkNoteSimple.vue
+++ b/packages/frontend/src/components/MkNoteSimple.vue
@@ -22,7 +22,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { } from 'vue';
+import { watch } from 'vue';
 import * as Misskey from 'misskey-js';
 import MkNoteHeader from '@/components/MkNoteHeader.vue';
 import MkSubNoteContent from '@/components/MkSubNoteContent.vue';
@@ -31,9 +31,14 @@ import { $i } from '@/account.js';
 
 const props = defineProps<{
 	note: Misskey.entities.Note;
+	expandAllCws?: boolean;
 }>();
 
-const showContent = $ref(false);
+let showContent = $ref(false);
+
+watch(() => props.expandAllCws, (expandAllCws) => {
+	if (expandAllCws !== showContent) showContent = expandAllCws;
+});
 </script>
 
 <style lang="scss" module>
diff --git a/packages/frontend/src/components/MkNoteSub.vue b/packages/frontend/src/components/MkNoteSub.vue
index 5b01b022da..83c91e34ed 100644
--- a/packages/frontend/src/components/MkNoteSub.vue
+++ b/packages/frontend/src/components/MkNoteSub.vue
@@ -66,7 +66,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</div>
 	</div>
 	<template v-if="depth < 5">
-		<MkNoteSub v-for="reply in replies" :key="reply.id" :note="reply" :class="$style.reply" :detail="true" :depth="depth + 1"/>
+		<MkNoteSub v-for="reply in replies" :key="reply.id" :note="reply" :class="$style.reply" :detail="true" :depth="depth + 1" :expandAllCws="props.expandAllCws"/>
 	</template>
 	<div v-else :class="$style.more">
 		<MkA class="_link" :to="notePage(note)">{{ i18n.ts.continueThread }} <i class="ph-caret-double-right ph-bold ph-lg"></i></MkA>
@@ -84,7 +84,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, ref, shallowRef } from 'vue';
+import { computed, ref, shallowRef, watch } from 'vue';
 import * as Misskey from 'misskey-js';
 import MkNoteHeader from '@/components/MkNoteHeader.vue';
 import MkReactionsViewer from '@/components/MkReactionsViewer.vue';
@@ -111,6 +111,7 @@ const canRenote = computed(() => ['public', 'home'].includes(props.note.visibili
 const props = withDefaults(defineProps<{
 	note: Misskey.entities.Note;
 	detail?: boolean;
+	expandAllCws?: boolean;
 
 	// how many notes are in between this one and the note being viewed in detail
 	depth?: number;
@@ -271,6 +272,11 @@ function undoQuote() : void {
 }
 
 let showContent = $ref(false);
+
+watch(() => props.expandAllCws, (expandAllCws) => {
+	if (expandAllCws !== showContent) showContent = expandAllCws;
+});
+
 let replies: Misskey.entities.Note[] = $ref([]);
 
 function renote() {
@@ -448,7 +454,7 @@ if (props.detail) {
 		color: var(--fgHighlighted);
 	}
 }
-	
+
 @container (max-width: 400px) {
 	.noteFooterButton {
 		&:not(:last-child) {
diff --git a/packages/frontend/src/pages/note.vue b/packages/frontend/src/pages/note.vue
index 1de610e282..7880e3361b 100644
--- a/packages/frontend/src/pages/note.vue
+++ b/packages/frontend/src/pages/note.vue
@@ -18,7 +18,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<MkButton v-if="!showNext" :class="$style.loadNext" @click="showNext = true"><i class="ph-caret-up ph-bold ph-lg"></i></MkButton>
 						<div class="_margin _gaps_s">
 							<MkRemoteCaution v-if="note.user.host != null" :href="note.url ?? note.uri"/>
-							<MkNoteDetailed :key="note.id" v-model:note="note" :class="$style.note"/>
+							<MkNoteDetailed :key="note.id" v-model:note="note" :class="$style.note" :expandAllCws="expandAllCws"/>
 						</div>
 						<div v-if="clips && clips.length > 0" class="_margin">
 							<div style="font-weight: bold; padding: 12px;">{{ i18n.ts.clip }}</div>
@@ -65,6 +65,7 @@ let note = $ref<null | Misskey.entities.Note>();
 let clips = $ref();
 let showPrev = $ref(false);
 let showNext = $ref(false);
+let expandAllCws = $ref(false);
 let error = $ref();
 
 const prevPagination = {
@@ -111,7 +112,13 @@ watch(() => props.noteId, fetchNote, {
 	immediate: true,
 });
 
-const headerActions = $computed(() => []);
+const headerActions = $computed(() => note ? [
+	{
+		icon: `${expandAllCws ? 'ph-eye' : 'ph-eye-slash'} ph-bold ph-lg`,
+		text: expandAllCws ? i18n.ts.collapseAllCws : i18n.ts.expandAllCws,
+		handler: () => { expandAllCws = !expandAllCws; },
+	},
+] : []);
 
 const headerTabs = $computed(() => []);