diff --git a/src/App.vue b/src/App.vue
index d730fda..d28748a 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -21,11 +21,33 @@
 
         <div v-if="sprites.length > 0" class="mt-8">
           <div class="flex flex-wrap items-center gap-6 mb-8">
-            <div class="flex items-center space-x-3">
+            <div class="flex items-center space-x-1">
               <label for="columns" class="text-gray-700 font-medium">Columns:</label>
               <input id="columns" type="number" v-model="columns" min="1" max="10" class="w-20 px-3 py-2 border border-gray-200 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent outline-none transition-all" />
             </div>
 
+            <!-- Add mass position buttons -->
+            <div class="flex items-center space-x-2">
+              <button @click="alignSprites('left')" class="p-2 bg-gray-100 hover:bg-gray-200 text-gray-700 rounded-lg transition-colors" title="Align Left">
+                <i class="fas fa-arrow-left"></i>
+              </button>
+              <button @click="alignSprites('center')" class="p-2 bg-gray-100 hover:bg-gray-200 text-gray-700 rounded-lg transition-colors" title="Align Center">
+                <i class="fas fa-arrows-left-right"></i>
+              </button>
+              <button @click="alignSprites('right')" class="p-2 bg-gray-100 hover:bg-gray-200 text-gray-700 rounded-lg transition-colors" title="Align Right">
+                <i class="fas fa-arrow-right"></i>
+              </button>
+              <button @click="alignSprites('top')" class="p-2 bg-gray-100 hover:bg-gray-200 text-gray-700 rounded-lg transition-colors" title="Align Top">
+                <i class="fas fa-arrow-up"></i>
+              </button>
+              <button @click="alignSprites('middle')" class="p-2 bg-gray-100 hover:bg-gray-200 text-gray-700 rounded-lg transition-colors" title="Align Middle">
+                <i class="fas fa-arrows-up-down"></i>
+              </button>
+              <button @click="alignSprites('bottom')" class="p-2 bg-gray-100 hover:bg-gray-200 text-gray-700 rounded-lg transition-colors" title="Align Bottom">
+                <i class="fas fa-arrow-down"></i>
+              </button>
+            </div>
+
             <button @click="downloadSpritesheet" class="px-6 py-2.5 bg-blue-500 hover:bg-blue-600 text-white font-medium rounded-lg transition-colors flex items-center space-x-2">
               <i class="fas fa-download"></i>
               <span>Download spritesheet</span>
@@ -145,24 +167,24 @@
     canvas.width = maxWidth * columns.value;
     canvas.height = maxHeight * rows;
 
-    // Apply pixel art optimization for the export canvas
+    // Disable image smoothing for pixel-perfect rendering
     ctx.imageSmoothingEnabled = false;
 
-    // Draw sprites
+    // Draw sprites with integer positions
     sprites.value.forEach((sprite, index) => {
       const col = index % columns.value;
       const row = Math.floor(index / columns.value);
 
-      const cellX = col * maxWidth;
-      const cellY = row * maxHeight;
+      const cellX = Math.floor(col * maxWidth);
+      const cellY = Math.floor(row * maxHeight);
 
-      ctx.drawImage(sprite.img, cellX + sprite.x, cellY + sprite.y);
+      ctx.drawImage(sprite.img, Math.floor(cellX + sprite.x), Math.floor(cellY + sprite.y));
     });
 
-    // Create download link
+    // Create download link with PNG format
     const link = document.createElement('a');
     link.download = 'spritesheet.png';
-    link.href = canvas.toDataURL('image/png');
+    link.href = canvas.toDataURL('image/png', 1.0); // Use maximum quality
     link.click();
   };
 
@@ -276,7 +298,8 @@
       }
 
       // Process each sprite
-      const newSprites = await Promise.all(
+      // Replace current sprites with imported ones
+      sprites.value = await Promise.all(
         jsonData.sprites.map(async (spriteData: any) => {
           return new Promise<Sprite>(resolve => {
             // Create image from base64
@@ -311,12 +334,57 @@
           });
         })
       );
-
-      // Replace current sprites with imported ones
-      sprites.value = newSprites;
     } catch (error) {
       console.error('Error importing JSON:', error);
       alert('Failed to import JSON file. Please check the file format.');
     }
   };
+
+  // Add new alignment function
+  const alignSprites = (position: 'left' | 'center' | 'right' | 'top' | 'middle' | 'bottom') => {
+    if (sprites.value.length === 0) return;
+
+    // Find max dimensions for the current column layout
+    let maxWidth = 0;
+    let maxHeight = 0;
+    sprites.value.forEach(sprite => {
+      maxWidth = Math.max(maxWidth, sprite.width);
+      maxHeight = Math.max(maxHeight, sprite.height);
+    });
+
+    sprites.value = sprites.value.map((sprite, index) => {
+      let x = sprite.x;
+      let y = sprite.y;
+
+      switch (position) {
+        case 'left':
+          x = 0;
+          break;
+        case 'center':
+          x = (maxWidth - sprite.width) / 2;
+          break;
+        case 'right':
+          x = maxWidth - sprite.width;
+          break;
+        case 'top':
+          y = 0;
+          break;
+        case 'middle':
+          y = (maxHeight - sprite.height) / 2;
+          break;
+        case 'bottom':
+          y = maxHeight - sprite.height;
+          break;
+      }
+
+      return { ...sprite, x, y };
+    });
+  };
 </script>
+
+<style>
+  canvas {
+    image-rendering: pixelated;
+    image-rendering: crisp-edges;
+  }
+</style>
diff --git a/src/components/SpriteCanvas.vue b/src/components/SpriteCanvas.vue
index f890cf0..602addc 100644
--- a/src/components/SpriteCanvas.vue
+++ b/src/components/SpriteCanvas.vue
@@ -194,18 +194,14 @@
     // Clear canvas
     ctx.value.clearRect(0, 0, canvasRef.value.width, canvasRef.value.height);
 
-    // Set pixel art optimization
-    if (pixelPerfect.value) {
-      ctx.value.imageSmoothingEnabled = false;
-    } else {
-      ctx.value.imageSmoothingEnabled = true;
-    }
+    // Disable image smoothing
+    ctx.value.imageSmoothingEnabled = false;
 
     // Draw grid
     ctx.value.strokeStyle = '#e5e7eb';
     for (let col = 0; col < props.columns; col++) {
       for (let row = 0; row < rows; row++) {
-        ctx.value.strokeRect(col * maxWidth, row * maxHeight, maxWidth, maxHeight);
+        ctx.value.strokeRect(Math.floor(col * maxWidth), Math.floor(row * maxHeight), maxWidth, maxHeight);
       }
     }
 
@@ -214,11 +210,11 @@
       const col = index % props.columns;
       const row = Math.floor(index / props.columns);
 
-      const cellX = col * maxWidth;
-      const cellY = row * maxHeight;
+      const cellX = Math.floor(col * maxWidth);
+      const cellY = Math.floor(row * maxHeight);
 
-      // Draw sprite
-      ctx.value?.drawImage(sprite.img, cellX + sprite.x, cellY + sprite.y);
+      // Draw sprite using integer positions
+      ctx.value?.drawImage(sprite.img, Math.floor(cellX + sprite.x), Math.floor(cellY + sprite.y));
     });
   };
 
diff --git a/src/components/SpritePreview.vue b/src/components/SpritePreview.vue
index d36b224..a7a5469 100644
--- a/src/components/SpritePreview.vue
+++ b/src/components/SpritePreview.vue
@@ -159,6 +159,7 @@
 
   // Add this after other refs
   const hiddenFrames = ref<number[]>([]);
+  const pixelPerfect = ref(true);
 
   // Add these computed properties
   const visibleFrames = computed(() => props.sprites.filter((_, index) => !hiddenFrames.value.includes(index)));
@@ -189,6 +190,9 @@
 
     const { maxWidth, maxHeight } = calculateMaxDimensions();
 
+    // Apply pixel art optimization consistently
+    ctx.value.imageSmoothingEnabled = !pixelPerfect.value;
+
     // Set canvas size to just fit one sprite cell
     previewCanvasRef.value.width = maxWidth;
     previewCanvasRef.value.height = maxHeight;
@@ -212,8 +216,8 @@
       }
     }
 
-    // Apply pixel art optimization
-    ctx.value.imageSmoothingEnabled = false;
+    // Keep pixel art optimization consistent throughout all drawing operations
+    ctx.value.imageSmoothingEnabled = !pixelPerfect.value;
 
     // Draw all sprites with transparency if enabled
     if (showAllSprites.value && props.sprites.length > 1) {
@@ -329,17 +333,17 @@
     const mouseX = ((event.clientX - rect.left) / zoom.value) * scaleX;
     const mouseY = ((event.clientY - rect.top) / zoom.value) * scaleY;
 
-    const deltaX = mouseX - dragStartX.value;
-    const deltaY = mouseY - dragStartY.value;
+    const deltaX = Math.round(mouseX - dragStartX.value);
+    const deltaY = Math.round(mouseY - dragStartY.value);
 
     const sprite = props.sprites[currentFrameIndex.value];
     if (!sprite || sprite.id !== activeSpriteId.value) return;
 
     const { maxWidth, maxHeight } = calculateMaxDimensions();
 
-    // Calculate new position with constraints
-    let newX = spritePosBeforeDrag.value.x + deltaX;
-    let newY = spritePosBeforeDrag.value.y + deltaY;
+    // Calculate new position with constraints and round to integers
+    let newX = Math.round(spritePosBeforeDrag.value.x + deltaX);
+    let newY = Math.round(spritePosBeforeDrag.value.y + deltaY);
 
     // Constrain movement within cell
     newX = Math.max(0, Math.min(maxWidth - sprite.width, newX));