diff --git a/locales/en-US.yml b/locales/en-US.yml
index 76e0c8edc4..137688b66c 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -1238,6 +1238,7 @@ noAltTextWarning: "Some attached file(s) have no description. Did you forget to
 showNoAltTextWarning: "Show a warning if you attempt to post files without a description"
 showAddFileDescriptionAtFirstPost: "Automatically open a form to write a description
   when you attempt to post files without a description"
+addAlt4MeTag: "Automatically append #Alt4Me hashtag to your post if attached file has no description"
 
 _emojiModPerm:
   unauthorized: "None"
diff --git a/packages/client/src/account.ts b/packages/client/src/account.ts
index 1d38b2798f..c4830f1210 100644
--- a/packages/client/src/account.ts
+++ b/packages/client/src/account.ts
@@ -7,7 +7,7 @@ import { alert, api, popup, popupMenu, waiting } from "@/os";
 import icon from "@/scripts/icon";
 import { del, get, set } from "@/scripts/idb-proxy";
 import { reloadChannel, unisonReload } from "@/scripts/unison-reload";
-import type { MenuButton, MenuUser } from "./types/menu";
+import type { MenuUser } from "./types/menu";
 
 // TODO: 他のタブと永続化されたstateを同期
 
diff --git a/packages/client/src/components/MkPostForm.vue b/packages/client/src/components/MkPostForm.vue
index 85da6ac55a..ce1119ed82 100644
--- a/packages/client/src/components/MkPostForm.vue
+++ b/packages/client/src/components/MkPostForm.vue
@@ -1195,6 +1195,13 @@ async function post() {
 		}
 	}
 
+	if (
+		defaultStore.state.addAlt4MeTag &&
+		files.value.some((f) => f.comment == null || f.comment.length === 0)
+	) {
+		text.value = `${text.value.trimEnd()}\n#Alt4Me`;
+	}
+
 	const processedText = preprocess(text.value);
 
 	let postData: ApiTypes.NoteSubmitReq = {
diff --git a/packages/client/src/pages/settings/general.vue b/packages/client/src/pages/settings/general.vue
index 5f9d252253..54b9f4aa62 100644
--- a/packages/client/src/pages/settings/general.vue
+++ b/packages/client/src/pages/settings/general.vue
@@ -127,12 +127,6 @@
 			<FormSwitch v-model="openServerInfo" class="_formBlock">{{
 				i18n.ts.openServerInfo
 			}}</FormSwitch>
-			<FormSwitch v-model="showNoAltTextWarning" class="_formBlock">{{
-				i18n.ts.showNoAltTextWarning
-			}}</FormSwitch>
-			<FormSwitch v-model="showAddFileDescriptionAtFirstPost" class="_formBlock">{{
-				i18n.ts.showAddFileDescriptionAtFirstPost
-			}}</FormSwitch>
 			<FormSwitch v-model="autocorrectNoteLanguage" class="_formBlock">{{
 				i18n.ts.autocorrectNoteLanguage
 			}}</FormSwitch>
@@ -191,6 +185,15 @@
 
 		<FormSection>
 			<template #label>{{ i18n.ts.accessibility }}</template>
+			<FormSwitch v-model="showNoAltTextWarning" class="_formBlock">{{
+				i18n.ts.showNoAltTextWarning
+			}}</FormSwitch>
+			<FormSwitch v-if="showNoAltTextWarning" v-model="showAddFileDescriptionAtFirstPost" class="_formBlock">{{
+				i18n.ts.showAddFileDescriptionAtFirstPost
+			}}</FormSwitch>
+			<FormSwitch v-model="addAlt4MeTag" class="_formBlock">{{
+				i18n.ts.addAlt4MeTag
+			}}</FormSwitch>
 			<FormSwitch v-model="expandOnNoteClick" class="_formBlock"
 				>{{ i18n.ts.expandOnNoteClick
 				}}<template #caption>{{
@@ -568,6 +571,7 @@ const mergeThreadInTimeline = computed(
 const mergeRenotesInTimeline = computed(
 	defaultStore.makeGetterSetter("mergeRenotesInTimeline"),
 );
+const addAlt4MeTag = computed(defaultStore.makeGetterSetter("addAlt4MeTag"));
 
 // This feature (along with injectPromo) is currently disabled
 // function onChangeInjectFeaturedNote(v) {
diff --git a/packages/client/src/pages/settings/preferences-backups.vue b/packages/client/src/pages/settings/preferences-backups.vue
index d0361d39f9..e281e2fd67 100644
--- a/packages/client/src/pages/settings/preferences-backups.vue
+++ b/packages/client/src/pages/settings/preferences-backups.vue
@@ -127,6 +127,10 @@ const defaultStoreSaveKeys: (keyof (typeof defaultStore)["state"])[] = [
 	"showNoAltTextWarning",
 	"showAddFileDescriptionAtFirstPost",
 	"autocorrectNoteLanguage",
+	"addAlt4MeTag",
+	"addRe",
+	"mergeRenotesInTimeline",
+	"mergeThreadInTimeline",
 ];
 const coldDeviceStorageSaveKeys: (keyof typeof ColdDeviceStorage.default)[] = [
 	"lightTheme",
diff --git a/packages/client/src/store.ts b/packages/client/src/store.ts
index a25e52ef8f..c1b26136cb 100644
--- a/packages/client/src/store.ts
+++ b/packages/client/src/store.ts
@@ -449,6 +449,10 @@ export const defaultStore = markRaw(
 			where: "account",
 			default: false,
 		},
+		addAlt4MeTag: {
+			where: "account",
+			default: false,
+		},
 		autocorrectNoteLanguage: {
 			where: "account",
 			default: true,