diff --git a/packages/frontend/src/components/MkVisitorDashboard.vue b/packages/frontend/src/components/MkVisitorDashboard.vue
index 6fb3304468..73d00b6a7c 100644
--- a/packages/frontend/src/components/MkVisitorDashboard.vue
+++ b/packages/frontend/src/components/MkVisitorDashboard.vue
@@ -6,7 +6,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 <template>
 <div v-if="instance" :class="$style.root">
 	<div :class="[$style.main, $style.panel]">
-		<img :src="instance.iconUrl || '/apple-touch-icon.png'" alt="" :class="$style.mainIcon"/>
+		<img v-if="instance.sidebarLogoUrl" :src="instance.sidebarLogoUrl" alt="" :class="$style.wideIcon"/>
+		<img v-if="!instance.sidebarLogoUrl" :src="instance.sidebarLogoUrl || instance.iconUrl || '/apple-touch-icon.png'" alt="" :class="$style.mainIcon"/>
 		<button class="_button _acrylic" :class="$style.mainMenu" @click="showMenu"><i class="ti ti-dots"></i></button>
 		<div :class="$style.mainFg">
 			<h1 :class="$style.mainTitle">
@@ -126,6 +127,14 @@ function showMenu(ev: MouseEvent) {
 	filter: drop-shadow(0 2px 5px rgba(0, 0, 0, 0.5));
 }
 
+.wideIcon {
+	min-width: 85px;
+	max-width: 60%;
+	margin-top: -47px;
+	vertical-align: bottom;
+	filter: drop-shadow(0 2px 5px rgba(0, 0, 0, 0.5));
+}
+
 .mainMenu {
 	position: absolute;
 	top: 16px;
diff --git a/packages/frontend/src/pages/about.overview.vue b/packages/frontend/src/pages/about.overview.vue
index c378c0a0b8..6fbb23265c 100644
--- a/packages/frontend/src/pages/about.overview.vue
+++ b/packages/frontend/src/pages/about.overview.vue
@@ -7,7 +7,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <div class="_gaps_m">
 	<div :class="$style.banner" :style="{ backgroundImage: `url(${ instance.bannerUrl })` }">
 		<div style="overflow: clip;">
-			<img :src="instance.iconUrl ?? instance.faviconUrl ?? '/favicon.ico'" alt="" :class="$style.bannerIcon"/>
+			<img :src="instance.sidebarLogoUrl ?? instance.iconUrl ?? instance.faviconUrl ?? '/favicon.ico'" alt="" :class="$style.bannerIcon"/>
 			<div :class="$style.bannerName">
 				<b>{{ instance.name ?? host }}</b>
 			</div>
@@ -160,7 +160,7 @@ const initStats = () => misskeyApi('stats', {});
 .bannerIcon {
 	display: block;
 	margin: 16px auto 0 auto;
-	height: 64px;
+	max-height: 96px;
 	border-radius: var(--radius-sm);;
 }
 
diff --git a/packages/frontend/src/ui/_common_/navbar-for-mobile.vue b/packages/frontend/src/ui/_common_/navbar-for-mobile.vue
index a3f9d6cf2c..311f8f542f 100644
--- a/packages/frontend/src/ui/_common_/navbar-for-mobile.vue
+++ b/packages/frontend/src/ui/_common_/navbar-for-mobile.vue
@@ -8,7 +8,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<div :class="$style.top">
 		<div :class="$style.banner" :style="{ backgroundImage: `url(${ instance.bannerUrl })` }"></div>
 		<button class="_button" :class="$style.instance" @click="openInstanceMenu">
-			<img :src="instance.iconUrl || instance.faviconUrl || '/favicon.ico'" alt="" :class="$style.instanceIcon"/>
+			<img v-if="instance.sidebarLogoUrl" :src="instance.sidebarLogoUrl" alt="" :class="$style.wideInstanceIcon"/>
+			<img v-if="!instance.sidebarLogoUrl" :src="instance.sidebarLogoUrl || instance.iconUrl || instance.faviconUrl || '/favicon.ico'" alt="" :class="$style.instanceIcon"/>
 		</button>
 	</div>
 	<div :class="$style.middle">
@@ -121,6 +122,14 @@ function more() {
 	aspect-ratio: 1;
 }
 
+	.wideInstanceIcon {
+		display: inline-block;
+		min-width: 38px;
+		max-width: 100%;
+		max-height: 80px;
+		
+	}
+
 .bottom {
 	position: sticky;
 	bottom: 0;
diff --git a/packages/frontend/src/ui/_common_/navbar.vue b/packages/frontend/src/ui/_common_/navbar.vue
index 1f1fd37def..6ebe65886a 100644
--- a/packages/frontend/src/ui/_common_/navbar.vue
+++ b/packages/frontend/src/ui/_common_/navbar.vue
@@ -9,7 +9,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<div :class="$style.top">
 			<div :class="$style.banner" :style="{ backgroundImage: `url(${ instance.bannerUrl })` }"></div>
 			<button v-tooltip.noDelay.right="instance.name ?? i18n.ts.instance" class="_button" :class="$style.instance" @click="openInstanceMenu">
-				<img :src="instance.iconUrl || instance.faviconUrl || '/favicon.ico'" alt="" :class="$style.instanceIcon"/>
+				<img v-if="instance.sidebarLogoUrl" :src="instance.sidebarLogoUrl" alt="" :class="$style.wideInstanceIcon"/>
+				<img v-if="!instance.sidebarLogoUrl" :src="instance.sidebarLogoUrl || instance.iconUrl || instance.faviconUrl || '/favicon.ico'" alt="" :class="$style.instanceIcon"/>
 			</button>
 		</div>
 		<div :class="$style.middle">
@@ -183,6 +184,14 @@ function more(ev: MouseEvent) {
 		aspect-ratio: 1;
 	}
 
+	.wideInstanceIcon {
+		display: inline-block;
+		min-width: 38px;
+		max-width: 100%;
+		max-height: 80px;
+		
+	}
+
 	.bottom {
 		position: sticky;
 		bottom: 0;