diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3a611276ec..d3cfea9ebb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@
 ### Client
 - 画像を動画と同様に簡単に隠せるように
 - フォローやお気に入り登録をしていないチャンネルを開く時は概要ページを開くように
+- Fix: 長い文章を投稿する際、プレビューが画面からはみ出る問題を修正
 
 ### Server
 
diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index 5c65569683..f9edc048ec 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -1015,6 +1015,8 @@ defineExpose({
 
 .preview {
 	padding: 16px 20px 0 20px;
+	max-height: 150px;
+	overflow: auto;
 }
 
 .targetNote {
diff --git a/packages/frontend/src/components/MkPostFormDialog.vue b/packages/frontend/src/components/MkPostFormDialog.vue
index 98af92c6f8..989c138e81 100644
--- a/packages/frontend/src/components/MkPostFormDialog.vue
+++ b/packages/frontend/src/components/MkPostFormDialog.vue
@@ -1,6 +1,6 @@
 <template>
 <MkModal ref="modal" :preferType="'dialog'" @click="modal.close()" @closed="onModalClosed()">
-	<MkPostForm ref="form" style="margin: 0 auto auto auto;" v-bind="props" autofocus freezeAfterPosted @posted="onPosted" @cancel="modal.close()" @esc="modal.close()"/>
+	<MkPostForm ref="form" :class="$style.form" v-bind="props" autofocus freezeAfterPosted @posted="onPosted" @cancel="modal.close()" @esc="modal.close()"/>
 </MkModal>
 </template>
 
@@ -44,3 +44,10 @@ function onModalClosed() {
 	emit('closed');
 }
 </script>
+
+<style lang="scss" module>
+.form {
+	max-height: 100%;
+	margin: 0 auto auto auto;
+}
+</style>