diff --git a/public/images/placeholder.jpg b/public/images/placeholder.jpg
new file mode 100644
index 000000000..84b730ed7
Binary files /dev/null and b/public/images/placeholder.jpg differ
diff --git a/public/images/placeholder.png b/public/images/placeholder.png
deleted file mode 100644
index 58ace60b6..000000000
Binary files a/public/images/placeholder.png and /dev/null differ
diff --git a/src/assets/thumbnail.png b/src/assets/thumbnail.png
deleted file mode 100644
index d6f16372c..000000000
Binary files a/src/assets/thumbnail.png and /dev/null differ
diff --git a/src/views/interface/ThemeList.vue b/src/views/interface/ThemeList.vue
index 926d739ff..8a7550d6f 100644
--- a/src/views/interface/ThemeList.vue
+++ b/src/views/interface/ThemeList.vue
@@ -24,7 +24,7 @@
               <div class="theme-thumb">
                 <img
                   :alt="item.name"
-                  :src="item.screenshots"
+                  :src="item.screenshots || '/images/placeholder.jpg'"
                   loading="lazy"
                 >
               </div>
diff --git a/src/views/post/components/PostSettingDrawer.vue b/src/views/post/components/PostSettingDrawer.vue
index 06233bdaa..79d8012b2 100644
--- a/src/views/post/components/PostSettingDrawer.vue
+++ b/src/views/post/components/PostSettingDrawer.vue
@@ -156,7 +156,7 @@
             <div class="post-thumb">
               <img
                 class="img"
-                :src="selectedPost.thumbnail || '/images/placeholder.png'"
+                :src="selectedPost.thumbnail || '/images/placeholder.jpg'"
                 @click="()=>this.thumbDrawerVisible=true"
               >
               <a-button
diff --git a/src/views/sheet/components/SheetSettingDrawer.vue b/src/views/sheet/components/SheetSettingDrawer.vue
index 04add1e49..733b8387d 100644
--- a/src/views/sheet/components/SheetSettingDrawer.vue
+++ b/src/views/sheet/components/SheetSettingDrawer.vue
@@ -73,7 +73,7 @@
             <div class="sheet-thumb">
               <img
                 class="img"
-                :src="selectedSheet.thumbnail || '/images/placeholder.png'"
+                :src="selectedSheet.thumbnail || '/images/placeholder.jpg'"
                 @click="()=>this.thumbDrawerVisible = true"
               >
               <a-button
diff --git a/src/views/sheet/internal/PhotoList.vue b/src/views/sheet/internal/PhotoList.vue
index 70ea52f23..deb68a62b 100644
--- a/src/views/sheet/internal/PhotoList.vue
+++ b/src/views/sheet/internal/PhotoList.vue
@@ -130,7 +130,7 @@
           >
             <div class="photo-detail-img">
               <img
-                :src="photo.url || '/images/placeholder.png'"
+                :src="photo.url || '/images/placeholder.jpg'"
                 @click="showThumbDrawer"
                 style="width: 100%;"
               >