diff --git a/fastlane/Fastfile b/fastlane/Fastfile
index 99fbfdf..0d2475a 100644
--- a/fastlane/Fastfile
+++ b/fastlane/Fastfile
@@ -8,12 +8,21 @@ lane :ios do
   )
 end
 
+lane :ios_iphone do
+  appicon(
+    appicon_image_file: 'spec/fixtures/ThemojiSmall.png',
+    appicon_devices: %i[iphone],
+    appicon_path: 'app'
+  )
+end
+
 lane :ios_splash do
   appicon(
     appicon_image_file: 'spec/fixtures/ThemojiSplash.png',
     appicon_devices: [:universal],
     appicon_path: 'app',
-    appicon_name: 'Splash.imageset'
+    appicon_name: 'Splash.imageset',
+    allow_upsampling: true
   )
 end
 
@@ -39,7 +48,8 @@ lane :android do
   android_appicon(
     appicon_image_file: 'spec/fixtures/Themoji.png',
     appicon_path: 'app/res/mipmap',
-    generate_rounded: true
+    generate_rounded: true,
+    allow_upsampling: true
   )
 end
 
diff --git a/lib/fastlane/plugin/appicon/actions/android_appicon_action.rb b/lib/fastlane/plugin/appicon/actions/android_appicon_action.rb
index 0893965..c795254 100644
--- a/lib/fastlane/plugin/appicon/actions/android_appicon_action.rb
+++ b/lib/fastlane/plugin/appicon/actions/android_appicon_action.rb
@@ -49,11 +49,19 @@ def self.run(params)
         custom_sizes = params[:appicon_custom_sizes]
 
         icons = Helper::AppiconHelper.get_needed_icons(params[:appicon_icon_types], self.needed_icons, true, custom_sizes)
+
+        allow_upsampling = params[:allow_upsampling]
+        if !allow_upsampling
+          input_image = MiniMagick::Image.open(fname)
+          # Check that the input image is large enough for the needed icons without upsampling
+          maxWidth = icons.map { |v| v['width'] }.max.to_i
+          maxHeight = icons.map { |v| v['height'] }.max.to_i
+          Helper::AppiconHelper.check_input_image_size(input_image, maxWidth, maxHeight)
+        end
+
         icons.each do |icon|
           image = MiniMagick::Image.open(fname)
 
-          Helper::AppiconHelper.check_input_image_size(image, 1024, 1024)
-
           # Custom icons will have basepath and filename already defined
           if icon.has_key?('basepath') && icon.has_key?('filename')
             basepath = Pathname.new(icon['basepath'])
@@ -173,6 +181,12 @@ def self.available_options
                                description: "Generate round icons?",
                              default_value: false,
                                       type: Boolean),
+          FastlaneCore::ConfigItem.new(key: :allow_upsampling,
+                                  env_name: "ALLOW_UPSAMPLING",
+                             default_value: false,
+                               description: "Allow the input image to be upsampled to larger sizes",
+                                  optional: true,
+                                      type: Boolean),
           FastlaneCore::ConfigItem.new(key: :minimagick_cli,
                                   env_name: "APPICON_MINIMAGICK_CLI",
                                description: "Set MiniMagick CLI (auto picked by default). Values are: graphicsmagick, imagemagick",
diff --git a/lib/fastlane/plugin/appicon/actions/appicon_action.rb b/lib/fastlane/plugin/appicon/actions/appicon_action.rb
index 2ea7134..cfc982d 100644
--- a/lib/fastlane/plugin/appicon/actions/appicon_action.rb
+++ b/lib/fastlane/plugin/appicon/actions/appicon_action.rb
@@ -75,13 +75,7 @@ def self.run(params)
         basepath = Pathname.new(File.join(params[:appicon_path], is_messages_extension ? params[:appicon_messages_name] : params[:appicon_name]))
         
         image = MiniMagick::Image.open(fname)
-
-        if is_messages_extension
-          Helper::AppiconHelper.check_input_image_size(image, 1024, 768)
-        else
-          Helper::AppiconHelper.check_input_image_size(image, 1024, 1024)
-        end
-
+        
         # Convert image to png
         image.format 'png'
 
@@ -97,6 +91,15 @@ def self.run(params)
         images = []
 
         icons = Helper::AppiconHelper.get_needed_icons(params[:appicon_devices], is_messages_extension ? self.needed_icons_messages_extension : self.needed_icons, false)
+
+        allow_upsampling = params[:allow_upsampling]
+        if !allow_upsampling
+          # Check that the input image is large enough for the needed icons without upsampling
+          maxWidth = icons.map { |v| v['width'] }.max.to_i
+          maxHeight = icons.map { |v| v['height'] }.max.to_i
+          Helper::AppiconHelper.check_input_image_size(image, maxWidth, maxHeight)
+        end
+
         icons.each do |icon|
           width = icon['width']
           height = icon['height']
@@ -208,6 +211,12 @@ def self.available_options
                                description: "App icon is generated for Messages extension",
                                   optional: true,
                                       type: Boolean),
+          FastlaneCore::ConfigItem.new(key: :allow_upsampling,
+                                  env_name: "ALLOW_UPSAMPLING",
+                             default_value: false,
+                               description: "Allow the input image to be upsampled to larger sizes",
+                                  optional: true,
+                                      type: Boolean),
           FastlaneCore::ConfigItem.new(key: :minimagick_cli,
                                   env_name: "APPICON_MINIMAGICK_CLI",
                                description: "Set MiniMagick CLI (auto picked by default). Values are: graphicsmagick, imagemagick",
diff --git a/spec/fixtures/ThemojiSmall.png b/spec/fixtures/ThemojiSmall.png
new file mode 100644
index 0000000..b57d432
Binary files /dev/null and b/spec/fixtures/ThemojiSmall.png differ