diff --git a/src/components/PreviewModal.vue b/src/components/PreviewModal.vue
index 4879456..92a5dda 100644
--- a/src/components/PreviewModal.vue
+++ b/src/components/PreviewModal.vue
@@ -73,6 +73,7 @@
   const isModalOpen = computed(() => store.isModalOpen.value);
   const sprites = computed(() => store.sprites.value);
   const animation = computed(() => store.animation);
+  const previewBorder = computed(() => store.previewBorder);
 
   const currentFrame = ref(0);
   const position = ref({ x: 0, y: 0 });
@@ -268,6 +269,17 @@
     { deep: true }
   );
 
+  // Watch for changes in border settings to update the preview
+  watch(
+    () => previewBorder.value,
+    () => {
+      if (isModalOpen.value && sprites.value.length > 0) {
+        store.renderAnimationFrame(currentFrame.value);
+      }
+    },
+    { deep: true }
+  );
+
   // Expose openModal for external use
   defineExpose({ openModal });
 </script>
diff --git a/src/components/SettingsModal.vue b/src/components/SettingsModal.vue
index aca5ffd..4327c0b 100644
--- a/src/components/SettingsModal.vue
+++ b/src/components/SettingsModal.vue
@@ -59,6 +59,36 @@
           </div>
         </div>
 
+        <!-- Preview Border Settings Section -->
+        <div class="mb-8">
+          <h3 class="text-lg font-medium text-gray-200 mb-4 flex items-center gap-2"><i class="fas fa-border-style text-blue-500"></i> Preview border</h3>
+          <div class="mb-4">
+            <div class="flex items-center justify-between mb-2">
+              <label class="text-sm text-gray-400">Enable border (preview only)</label>
+              <div class="relative inline-block w-10 align-middle select-none">
+                <input type="checkbox" v-model="previewBorder.enabled" id="toggle-border" class="sr-only" />
+                <label for="toggle-border" class="block h-6 rounded-full bg-gray-600 cursor-pointer"></label>
+                <div :class="{ 'translate-x-4': previewBorder.enabled, 'translate-x-0': !previewBorder.enabled }" class="absolute left-0 top-0 w-6 h-6 rounded-full bg-white border border-gray-300 transform transition-transform duration-200 ease-in-out"></div>
+              </div>
+            </div>
+
+            <div class="grid grid-cols-2 gap-4 mt-4" v-if="previewBorder.enabled">
+              <div>
+                <label class="block text-sm text-gray-400 mb-2">Border color</label>
+                <input type="color" v-model="previewBorder.color" class="w-full h-8 bg-gray-700 rounded cursor-pointer" />
+              </div>
+              <div>
+                <label class="block text-sm text-gray-400 mb-2">Border width: {{ previewBorder.width }}px</label>
+                <input type="range" v-model.number="previewBorder.width" min="1" max="10" class="w-full h-2 bg-gray-700 rounded-lg appearance-none cursor-pointer" />
+              </div>
+            </div>
+
+            <div class="text-xs text-gray-400 mt-2">
+              <i class="fas fa-info-circle mr-1"></i> Border will only be visible in the preview and won't be included in the downloaded spritesheet.
+            </div>
+          </div>
+        </div>
+
         <!-- Keyboard Shortcuts Section -->
         <div>
           <h3 class="text-lg font-medium text-gray-200 mb-4 flex items-center gap-2"><i class="fas fa-keyboard text-blue-500"></i> Keyboard shortcuts</h3>
@@ -93,6 +123,7 @@
   const store = useSpritesheetStore();
   const sprites = computed(() => store.sprites.value);
   const isModalOpen = computed(() => store.isSettingsModalOpen.value);
+  const previewBorder = computed(() => store.previewBorder);
 
   // Column count control
   const columnCount = ref(store.columns.value);
@@ -130,3 +161,47 @@
     store.showNotification(`Column count updated to ${columnCount.value}`);
   };
 </script>
+
+<style scoped>
+  /* Toggle switch styles */
+  input[type='checkbox'] + label {
+    width: 2.5rem;
+  }
+
+  input[type='checkbox']:checked + label {
+    background-color: #0096ff;
+  }
+
+  /* Range input styles */
+  input[type='range']::-webkit-slider-thumb {
+    appearance: none;
+    width: 15px;
+    height: 15px;
+    background: #0096ff;
+    border-radius: 50%;
+    cursor: pointer;
+  }
+
+  input[type='range']::-moz-range-thumb {
+    width: 15px;
+    height: 15px;
+    background: #0096ff;
+    border-radius: 50%;
+    cursor: pointer;
+  }
+
+  /* Color input styles */
+  input[type='color'] {
+    -webkit-appearance: none;
+    border: none;
+  }
+
+  input[type='color']::-webkit-color-swatch-wrapper {
+    padding: 0;
+  }
+
+  input[type='color']::-webkit-color-swatch {
+    border: none;
+    border-radius: 4px;
+  }
+</style>
diff --git a/src/composables/useSpritesheetStore.ts b/src/composables/useSpritesheetStore.ts
index 6f193a0..6536888 100644
--- a/src/composables/useSpritesheetStore.ts
+++ b/src/composables/useSpritesheetStore.ts
@@ -41,6 +41,13 @@ const isSettingsModalOpen = ref(false);
 const isSpritesModalOpen = ref(false);
 const zoomLevel = ref(1); // Default zoom level (1 = 100%)
 
+// Preview border settings
+const previewBorder = reactive({
+  enabled: false,
+  color: '#ff0000', // Default red color
+  width: 2 // Default width in pixels
+});
+
 export function useSpritesheetStore() {
   const animation = reactive<AnimationState>({
     canvas: null,
@@ -399,6 +406,10 @@ export function useSpritesheetStore() {
 
     animation.ctx.clearRect(0, 0, animation.canvas.width, animation.canvas.height);
 
+    // Draw background (transparent by default)
+    animation.ctx.fillStyle = 'transparent';
+    animation.ctx.fillRect(0, 0, animation.canvas.width, animation.canvas.height);
+
     const currentSprite = sprites.value[frameIndex % sprites.value.length];
 
     const cellX = Math.floor(currentSprite.x / cellSize.width);
@@ -408,6 +419,13 @@ export function useSpritesheetStore() {
     const offsetY = currentSprite.y - cellY * cellSize.height;
 
     animation.ctx.drawImage(currentSprite.img, offsetX, offsetY);
+
+    // Draw border if enabled (only for preview, not included in download)
+    if (previewBorder.enabled) {
+      animation.ctx.strokeStyle = previewBorder.color;
+      animation.ctx.lineWidth = previewBorder.width;
+      animation.ctx.strokeRect(0, 0, animation.canvas.width, animation.canvas.height);
+    }
   }
 
   function animationLoop(timestamp?: number) {
@@ -480,6 +498,7 @@ export function useSpritesheetStore() {
     animation,
     notification,
     zoomLevel,
+    previewBorder,
     addSprites,
     updateCellSize,
     updateCanvasSize,