diff --git a/Editor/TexturePackerWindow.cs b/Editor/TexturePackerWindow.cs
index ea77800..fa80153 100644
--- a/Editor/TexturePackerWindow.cs
+++ b/Editor/TexturePackerWindow.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using UnityEditor;
@@ -26,6 +26,9 @@ public class TexturePackerWindow : EditorWindow
         private List<TextureItem> _items = new List<TextureItem>();
         private TexturePreview _preview;
 
+        private bool _useCustomTexSize = false;
+        private bool _overrideDefaultTexSize = true;
+
         [MenuItem("Window/Channel Packer")]
         static void Open()
         {
@@ -38,7 +41,7 @@ public void Initialize()
             minSize = _windowSize;
             titleContent = new GUIContent(_windowTitle);
 
-            for(int i = _textureSupportedResolutionMin; i <= _textureSupportedResolutionMax; i *= 2)
+            for (int i = _textureSupportedResolutionMin; i <= _textureSupportedResolutionMax; i *= 2)
             {
                 _textureResolutions.Add(i);
                 _textureResolutionsNames.Add(i.ToString());
@@ -53,7 +56,7 @@ private void RefreshItems()
             if (_items.Count == 0)
                 return;
 
-            var toDeleteItems = _items.Where(x => x.toDelete==true).ToList();
+            var toDeleteItems = _items.Where(x => x.toDelete == true).ToList();
             foreach (var item in toDeleteItems)
             {
                 _texturePacker.Remove(item.input);
@@ -61,6 +64,11 @@ private void RefreshItems()
             }
         }
 
+        private void SetTexSizeFromInput(TextureInput input)
+        {
+            _texturePacker.texSize = input.texture == null ? Vector2Int.zero : new Vector2Int(input.texture.width, input.texture.height);
+        }
+
         private void OnGUI()
         {
             _windowScrollPos = EditorGUILayout.BeginScrollView(_windowScrollPos, false, false);
@@ -93,26 +101,62 @@ private void OnGUI()
             GUILayout.FlexibleSpace();
             EditorGUILayout.EndHorizontal();
 
-            int prevRes = _texturePacker.resolution;
+            Vector2Int prevTexSize = _texturePacker.texSize;
             _texturePacker.resolution = 128;
 
             _preview.Draw(_texturePacker);
 
-            _texturePacker.resolution = prevRes;
+            _texturePacker.texSize = prevTexSize;
 
             GUILayout.Label("Options", TexturePackerStyles.Heading);
             GUILayout.BeginVertical(TexturePackerStyles.Section);
             _textureFormat = (TextureFormat)EditorGUILayout.EnumPopup("> Format:", _textureFormat);
-            _texturePacker.resolution = EditorGUILayout.IntPopup("> Resolution:", _texturePacker.resolution, _textureResolutionsNames.ToArray(), _textureResolutions.ToArray());
+
+            _useCustomTexSize = EditorGUILayout.Toggle("> Custom texture size:", _useCustomTexSize);
+
+            if (_useCustomTexSize)
+            {
+                if (_overrideDefaultTexSize && _texturePacker.texInputs.Count == 1)
+                {
+                    SetTexSizeFromInput(_texturePacker.texInputs[0]);
+                }
+                _overrideDefaultTexSize = false;
+
+                _texturePacker.texSize.x = Mathf.Abs(EditorGUILayout.IntField("> Texture width:", _texturePacker.texSize.x));
+                _texturePacker.texSize.y = Mathf.Abs(EditorGUILayout.IntField("> Texture height:", _texturePacker.texSize.y));
+
+                if (_texturePacker.texInputs.Count > 0)
+                {
+                    EditorGUILayout.Separator();
+                    if (GUILayout.Button("Use size from input"))
+                    {
+                        var menu = new GenericMenu();
+                        for (int i = 0; i < _texturePacker.texInputs.Count; i++)
+                        {
+                            TextureInput input = _texturePacker.texInputs[i];
+                            menu.AddItem(new GUIContent($"Input {i + 1}"), on: false, () => SetTexSizeFromInput(input));
+                        }
+
+                        var dropdownPos = new Rect(Event.current.mousePosition, size: Vector2.zero);
+                        menu.DropDown(dropdownPos);
+                    }
+                }
+            }
+            else
+            {
+                _texturePacker.texSize = Vector2Int.one * EditorGUILayout.IntPopup("> Resolution:", _texturePacker.resolution, _textureResolutionsNames.ToArray(), _textureResolutions.ToArray());
+                _overrideDefaultTexSize = true;
+            }
+
             GUILayout.EndVertical();
 
             if (GUILayout.Button("Generate Texture", TexturePackerStyles.Button))
             {
                 string defaultPath = Application.dataPath;
-                if(_texturePacker.texInputs.Count > 0 && _texturePacker.texInputs[0].texture != null)
+                if (_texturePacker.texInputs.Count > 0 && _texturePacker.texInputs[0].texture != null)
                 {
                     string path = AssetDatabase.GetAssetPath(_texturePacker.texInputs[0].texture);
-                    if(path != null && !string.IsNullOrEmpty(path))
+                    if (path != null && !string.IsNullOrEmpty(path))
                     {
                         path = Path.Combine(Application.dataPath, "..", path);
                         defaultPath = Path.GetDirectoryName(path);
@@ -123,9 +167,9 @@ private void OnGUI()
                 {
                     Texture2D output = _texturePacker.Create();
 
-                    if(_textureFormat == TextureFormat.JPG)
+                    if (_textureFormat == TextureFormat.JPG)
                         File.WriteAllBytes(savePath, output.EncodeToJPG());
-                    else if(_textureFormat == TextureFormat.PNG)
+                    else if (_textureFormat == TextureFormat.PNG)
                         File.WriteAllBytes(savePath, output.EncodeToPNG());
                     else
                         File.WriteAllBytes(savePath, output.EncodeToEXR());
diff --git a/Editor/TexturePackerWindow.cs.meta b/Editor/TexturePackerWindow.cs.meta
index ddd2b67..88a5a06 100644
--- a/Editor/TexturePackerWindow.cs.meta
+++ b/Editor/TexturePackerWindow.cs.meta
@@ -1,13 +1,2 @@
 fileFormatVersion: 2
-guid: ccb4b81226a897345898c0c1e08e4f14
-timeCreated: 1518232730
-licenseType: Free
-MonoImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  defaultReferences: []
-  executionOrder: 0
-  icon: {instanceID: 0}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
+guid: ccb4b81226a897345898c0c1e08e4f14
\ No newline at end of file
diff --git a/Runtime/TexturePacker.cs b/Runtime/TexturePacker.cs
index d9de1c7..c2c18b4 100644
--- a/Runtime/TexturePacker.cs
+++ b/Runtime/TexturePacker.cs
@@ -13,7 +13,17 @@ public List<TextureInput> texInputs {
             get { return _texInputs; }
         }
 
-        public int resolution = 2048;
+        public Vector2Int texSize = new Vector2Int(2048, 2048);
+
+        private int _resolution;
+        public int resolution {
+            get { return _resolution; }
+            set
+            {
+                _resolution = value;
+                texSize = Vector2Int.one * value;
+            }
+        }
 
         public void Initialize()
         {
@@ -108,7 +118,7 @@ public Texture2D Create()
                 ++idx;
             }
 
-            var texture = TextureUtility.GenerateTexture(resolution, resolution, _material);
+            var texture = TextureUtility.GenerateTexture(texSize.x, texSize.y, _material);
 
             return texture;
         }