diff --git a/resources/config.yml b/resources/config.yml
new file mode 100644
index 0000000..6d1117a
--- /dev/null
+++ b/resources/config.yml
@@ -0,0 +1,20 @@
+# Configuration for ItemStacker
+
+# 1. Configuration for Stack Radius
+stacking_radius: 5.0
+
+# 2. Configuration for Max Stack Size Enforcement
+# If set to 0, no global limit is applied (uses item's default max stack size).
+max_global_stack_size: 1024
+
+# 3. Custom Tag Display Format
+# Define the format for the item stack name tag.
+# Available placeholders:
+#   - {COUNT}: The total number of stacked items.
+#   - {ITEM_NAME}: The item's default name (e.g., "Stone").
+# You can use Minecraft color codes (e.g., §r, §l, §a)
+tag_format: "§r§l§7{ITEM_NAME} §r§7x§b{COUNT}"
+
+# 4. Default Name Tag Display (Optional fallback)
+# If true, the name tag will still be set even if the stack size is 1.
+display_single_stack_tag: false
diff --git a/src/david/itemStacker/EventListener.php b/src/david/itemStacker/EventListener.php
index d52e2db..1c8ffff 100644
--- a/src/david/itemStacker/EventListener.php
+++ b/src/david/itemStacker/EventListener.php
@@ -1,50 +1,128 @@
-<?php
-
-declare(strict_types=1);
-
-namespace david\itemStacker;
-
-use pocketmine\event\Listener;
-use pocketmine\event\entity\EntitySpawnEvent;
-
-use pocketmine\entity\object\ItemEntity;
-
-class EventListener implements Listener {
-
-    public function onEntitySpawn(EntitySpawnEvent $event) : void{
-        $entity = $event->getEntity();
-        
-        if (!$entity instanceof ItemEntity) {
-            return;
-        }
-        
-        $position = $entity->getPosition();
-        $world = $position->getWorld();
-        $entities = $world->getNearbyEntities($entity->getBoundingBox()->expandedCopy(5, 5, 5));
-        
-        if (empty($entities)) {
-            return;
-        }
-        
-        $originalItem = $entity->getItem();
-        $totalItemCount = $originalItem->getCount();
-        
-        foreach ($entities as $e) {
-            if ($e instanceof ItemEntity && $entity !== $e) {
-                $itemE = $e->getItem();
-                if ($itemE->equals($originalItem)) {
-                    $e->flagForDespawn();
-                    $originalItem->setCount($originalItem->getCount() + $itemE->getCount());
-                    $totalItemCount += $itemE->getCount();
-                }
-            }
-        }
-        
-        if ($totalItemCount > 1) {
-            $itemName = $originalItem->getName();
-            $tag = "§7" . $itemName . " §7x§b" . $totalItemCount;
-            $entity->setNameTag($tag);
-            $entity->setNameTagAlwaysVisible(true);
-        }
-    }
-}
+<?php
+
+declare(strict_types=1);
+
+namespace david\itemStacker;
+
+use pocketmine\entity\Entity;
+use pocketmine\entity\object\ItemEntity;
+use pocketmine\event\entity\EntitySpawnEvent;
+use pocketmine\event\Listener;
+use pocketmine\math\AxisAlignedBB;
+use function count;
+use function str_replace;
+
+class EventListener implements Listener {
+	private Loader $plugin;
+
+	public function __construct(Loader $plugin) {
+		$this->plugin = $plugin;
+	}
+
+	public function onEntitySpawn(EntitySpawnEvent $event) : void {
+		$entity = $event->getEntity();
+
+		if (!$entity instanceof ItemEntity) {
+			return;
+		}
+
+		$originalItem = $entity->getItem();
+
+		$world = $entity->getWorld();
+		$position = $entity->getPosition();
+
+		$stackRadius = $this->plugin->getStackRadius();
+		$maxGlobalStackSize = $this->plugin->getMaxGlobalStackSize();
+		$displaySingleStackTag = $this->plugin->displaySingleStackTag();
+
+		$halfRadius = $stackRadius / 2;
+
+		$aabb = new AxisAlignedBB(
+			$position->x - $halfRadius,
+			$position->y - $halfRadius,
+			$position->z - $halfRadius,
+			$position->x + $halfRadius,
+			$position->y + $halfRadius,
+			$position->z + $halfRadius
+		);
+
+		/** @var array<Entity> $entities */
+		$entities = $world->getNearbyEntities($aabb, $entity);
+
+		if (count($entities) === 0) {
+			$finalCount = $originalItem->getCount();
+			if ($finalCount > 0 && $displaySingleStackTag) {
+				$this->updateNameTag($entity, $originalItem->getName(), $finalCount);
+			}
+
+			return;
+		}
+
+		$tempStack = clone $originalItem;
+		$itemsToSpawn = [];
+		$entitiesToDespawn = [];
+
+		$maxItemStack = $maxGlobalStackSize > 0 ? $maxGlobalStackSize : $originalItem->getMaxStackSize();
+
+		foreach ($entities as $nearbyEntity) {
+			if ($nearbyEntity instanceof ItemEntity) {
+				$nearbyItem = $nearbyEntity->getItem();
+
+				if ($nearbyItem->equals($originalItem)) {
+					$nearbyCount = $nearbyItem->getCount();
+					$entitiesToDespawn[] = $nearbyEntity;
+
+					$currentCount = $tempStack->getCount();
+
+					if ($currentCount + $nearbyCount > $maxItemStack) {
+						$canAdd = $maxItemStack - $currentCount;
+						$remainder = $nearbyCount - $canAdd;
+
+						$tempStack->setCount($maxItemStack);
+
+						$spillItem = clone $originalItem;
+						$spillItem->setCount($remainder);
+						$itemsToSpawn[] = $spillItem;
+
+						break;
+					}
+
+					$tempStack->setCount($currentCount + $nearbyCount);
+				}
+			}
+		}
+
+		foreach ($entitiesToDespawn as $nearbyEntity) {
+			$nearbyEntity->flagForDespawn();
+		}
+
+		$entity->setStackSize($tempStack->getCount());
+
+		$entity->setDespawnDelay(ItemEntity::DEFAULT_DESPAWN_DELAY);
+
+		$finalCount = $tempStack->getCount();
+
+		if ($finalCount > 1 || $displaySingleStackTag) {
+			$this->updateNameTag($entity, $tempStack->getName(), $finalCount);
+		} else {
+			$entity->setNameTag('');
+		}
+
+		foreach ($itemsToSpawn as $spillItem) {
+			$world->dropItem($position, $spillItem);
+		}
+	}
+
+	private function updateNameTag(ItemEntity $entity, string $itemName, int $count) : void {
+		$tagFormat = $this->plugin->getTagFormat();
+
+		$tag = str_replace(
+			['{COUNT}', '{ITEM_NAME}'],
+			[(string) $count, $itemName],
+			$tagFormat
+		);
+
+		$entity->setNameTag($tag);
+		$entity->setNameTagAlwaysVisible(true);
+	}
+}
diff --git a/src/david/itemStacker/Loader.php b/src/david/itemStacker/Loader.php
index 64c75fd..f3cfa91 100644
--- a/src/david/itemStacker/Loader.php
+++ b/src/david/itemStacker/Loader.php
@@ -1,18 +1,86 @@
-<?php
-
-declare(strict_types=1);
-
-namespace david\itemStacker;
-
-use pocketmine\plugin\PluginBase;
-
-use DaPigGuy\libPiggyUpdateChecker\libPiggyUpdateChecker;
-
-class Loader extends PluginBase {
-
-    protected function onEnable() : void{
-        $this->getServer()->getPluginManager()->registerEvents(new EventListener(), $this);
-
-        libPiggyUpdateChecker::init($this);
-    }
-}
+<?php
+
+declare(strict_types=1);
+
+namespace david\itemStacker;
+
+use DaPigGuy\libPiggyUpdateChecker\libPiggyUpdateChecker;
+use pocketmine\plugin\PluginBase;
+use function is_bool;
+use function is_int;
+use function is_numeric;
+use function is_string;
+use function trim;
+
+class Loader extends PluginBase {
+	private float $stackRadius;
+	private int $maxGlobalStackSize;
+	private string $tagFormat;
+	private bool $displaySingleStackTag;
+
+	protected function onEnable() : void {
+		$this->saveDefaultConfig();
+		$this->validateConfig($this->getConfig()->getAll());
+
+		$this->getServer()->getPluginManager()->registerEvents(new EventListener($this), $this);
+
+		libPiggyUpdateChecker::init($this);
+	}
+
+	/**
+	 * Performs strict validation and sets class properties.
+	 *
+	 * @param array<string, mixed> $config
+	 */
+	private function validateConfig(array $config) : void {
+		$logger = $this->getLogger();
+
+		$radius = $config['stacking_radius'] ?? 5.0;
+		if (!is_numeric($radius) || (float) $radius <= 0.0) {
+			$radius = 5.0;
+			$logger->warning("Invalid 'stacking_radius' in config.yml. Must be a positive number. Using default: 5.0");
+		}
+
+		$this->stackRadius = (float) $radius;
+
+		$maxSize = $config['max_global_stack_size'] ?? 1024;
+		if (!is_int($maxSize) || $maxSize < 0) {
+			$maxSize = 1024;
+			$logger->warning("Invalid 'max_global_stack_size' in config.yml. Must be a non-negative integer. Using default: 1024");
+		}
+
+		$this->maxGlobalStackSize = $maxSize;
+
+		$format = $config['tag_format'] ?? '§r§7{ITEM_NAME} §r§7x§b{COUNT}';
+		if (!is_string($format) || trim($format) === '') {
+			$format = '§r§7{ITEM_NAME} §r§7x§b{COUNT}';
+			$logger->warning("Invalid 'tag_format' in config.yml. Must be a non-empty string. Using default format.");
+		}
+
+		$this->tagFormat = $format;
+
+		$displaySingle = $config['display_single_stack_tag'] ?? false;
+		if (!is_bool($displaySingle)) {
+			$displaySingle = false;
+			$logger->warning("Invalid 'display_single_stack_tag' in config.yml. Must be a boolean (true/false). Using default: false");
+		}
+
+		$this->displaySingleStackTag = $displaySingle;
+	}
+
+	public function getStackRadius() : float {
+		return $this->stackRadius;
+	}
+
+	public function getMaxGlobalStackSize() : int {
+		return $this->maxGlobalStackSize;
+	}
+
+	public function getTagFormat() : string {
+		return $this->tagFormat;
+	}
+
+	public function displaySingleStackTag() : bool {
+		return $this->displaySingleStackTag;
+	}
+}