diff --git a/locales/en-US.yml b/locales/en-US.yml
index 8a32d8307c..7a9a54ed9e 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -524,6 +524,7 @@ mediaListWithOneImageAppearance: "Height of media lists with one image only"
 limitTo: "Limit to {x}"
 noFollowRequests: "You don't have any pending follow requests"
 openImageInNewTab: "Open images in new tab"
+warnForMissingAltText: "Warn you when you forget to put alt text"
 dashboard: "Dashboard"
 local: "Local"
 remote: "Remote"
@@ -1051,6 +1052,9 @@ thisPostMayBeAnnoying: "This note may annoy others."
 thisPostMayBeAnnoyingHome: "Post to home timeline"
 thisPostMayBeAnnoyingCancel: "Cancel"
 thisPostMayBeAnnoyingIgnore: "Post anyway"
+thisPostIsMissingAltTextCancel: "Cancel"
+thisPostIsMissingAltTextIgnore: "Post anyway"
+thisPostIsMissingAltText: "One of the files attached to this post is missing alt text. Please ensure all the attachments have alt text."
 collapseRenotes: "Collapse boosts you've already seen"
 collapseFiles: "Collapse files"
 autoloadConversation: "Load conversation on replies"
diff --git a/locales/index.d.ts b/locales/index.d.ts
index 012cbe055a..c9179a2049 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -4221,6 +4221,18 @@ export interface Locale extends ILocale {
      * このまま投稿
      */
     "thisPostMayBeAnnoyingIgnore": string;
+    /**
+     * Cancel
+     */
+    "thisPostIsMissingAltTextCancel": string;
+    /**
+     * Post anyway
+     */
+    "thisPostIsMissingAltTextIgnore": string;
+    /**
+     * One of the files attached to this post is missing alt text. Please ensure all the attachments have alt text.
+     */
+    "thisPostIsMissingAltText": string;
     /**
      * 見たことのあるブーストを省略して表示
      */
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 9714f8f668..e6eee1d988 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1051,6 +1051,9 @@ thisPostMayBeAnnoying: "この投稿は迷惑になる可能性があります
 thisPostMayBeAnnoyingHome: "ホームに投稿"
 thisPostMayBeAnnoyingCancel: "やめる"
 thisPostMayBeAnnoyingIgnore: "このまま投稿"
+thisPostIsMissingAltTextCancel: "Cancel"
+thisPostIsMissingAltTextIgnore: "Post anyway"
+thisPostIsMissingAltText: "One of the files attached to this post is missing alt text. Please ensure all the attachments have alt text."
 collapseRenotes: "見たことのあるブーストを省略して表示"
 collapseFiles: "ファイルを折りたたむ"
 autoloadConversation: "返信に会話を読み込む"
diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index 65ffb7b7a5..25e51fd52c 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -101,7 +101,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { inject, watch, nextTick, onMounted, defineAsyncComponent, provide, shallowRef, ref, computed } from 'vue';
+import { inject, watch, nextTick, onMounted, defineAsyncComponent, provide, shallowRef, ref, computed, toRaw } from 'vue';
 import * as mfm from '@transfem-org/sfm-js';
 import * as Misskey from 'misskey-js';
 import insertTextAtCursor from 'insert-text-at-cursor';
@@ -744,6 +744,39 @@ async function post(ev?: MouseEvent) {
 			visibility.value = 'home';
 		}
 	}
+	
+	if (defaultStore.state.warnMissingAltText) {
+		const filesData = toRaw(files.value);
+		for (let i = 0; i < filesData.length; i++) {
+			const file = filesData[i];
+			const isMissingAltText = !file.comment;
+			if (isMissingAltText) {
+				const { canceled, result } = await os.actions({
+					type: 'warning',
+					text: i18n.ts.thisPostIsMissingAltText,
+					actions: [{
+						value: 'cancel',
+						text: i18n.ts.thisPostIsMissingAltTextCancel,
+					}, {
+						value: 'ignore',
+						text: i18n.ts.thisPostIsMissingAltTextIgnore,
+					}],
+				});
+
+				if (canceled) return;
+				if (result === 'cancel') return;
+				if (result === 'home') {
+					visibility.value = 'home';
+				}
+
+				// await os.alert({
+				// 	type: 'info',
+				// 	text: i18n.ts.thisPostIsMissingAltText,
+				// });
+				// return;
+			}
+		}
+	}
 
 	let postData = {
 		text: text.value === '' ? null : text.value,
diff --git a/packages/frontend/src/pages/settings/general.vue b/packages/frontend/src/pages/settings/general.vue
index 3b2946e2b7..9247e25fc8 100644
--- a/packages/frontend/src/pages/settings/general.vue
+++ b/packages/frontend/src/pages/settings/general.vue
@@ -180,6 +180,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 		<div class="_gaps_m">
 			<div class="_gaps_s">
+				<MkSwitch v-model="warnMissingAltText">{{ i18n.ts.warnForMissingAltText }}</MkSwitch>
 				<MkSwitch v-model="imageNewTab">{{ i18n.ts.openImageInNewTab }}</MkSwitch>
 				<MkSwitch v-model="useReactionPickerForContextMenu">{{ i18n.ts.useReactionPickerForContextMenu }}</MkSwitch>
 				<MkSwitch v-model="enableInfiniteScroll">{{ i18n.ts.enableInfiniteScroll }}</MkSwitch>
@@ -337,6 +338,7 @@ const oneko = computed(defaultStore.makeGetterSetter('oneko'));
 const loadRawImages = computed(defaultStore.makeGetterSetter('loadRawImages'));
 const highlightSensitiveMedia = computed(defaultStore.makeGetterSetter('highlightSensitiveMedia'));
 const imageNewTab = computed(defaultStore.makeGetterSetter('imageNewTab'));
+const warnMissingAltText = computed(defaultStore.makeGetterSetter('warnMissingAltText'));
 const nsfw = computed(defaultStore.makeGetterSetter('nsfw'));
 const showFixedPostForm = computed(defaultStore.makeGetterSetter('showFixedPostForm'));
 const showFixedPostFormInChannel = computed(defaultStore.makeGetterSetter('showFixedPostFormInChannel'));
diff --git a/packages/frontend/src/pages/settings/preferences-backups.vue b/packages/frontend/src/pages/settings/preferences-backups.vue
index ad0903caee..9aa2012a81 100644
--- a/packages/frontend/src/pages/settings/preferences-backups.vue
+++ b/packages/frontend/src/pages/settings/preferences-backups.vue
@@ -71,6 +71,7 @@ const defaultStoreSaveKeys: (keyof typeof defaultStore['state'])[] = [
 	'animatedMfm',
 	'advancedMfm',
 	'loadRawImages',
+	'warnMissingAltText',
 	'imageNewTab',
 	'dataSaver',
 	'disableShowingAnimatedImages',
diff --git a/packages/frontend/src/store.ts b/packages/frontend/src/store.ts
index d695caa95f..a1f552487c 100644
--- a/packages/frontend/src/store.ts
+++ b/packages/frontend/src/store.ts
@@ -264,6 +264,10 @@ export const defaultStore = markRaw(new Storage('base', {
 		where: 'device',
 		default: false,
 	},
+	warnMissingAltText: {
+		where: 'device',
+		default: true,
+	},
 	imageNewTab: {
 		where: 'device',
 		default: false,