diff --git a/python/sglang/multimodal_gen/configs/pipeline_configs/wan.py b/python/sglang/multimodal_gen/configs/pipeline_configs/wan.py
index 6a824e678..c08851e93 100644
--- a/python/sglang/multimodal_gen/configs/pipeline_configs/wan.py
+++ b/python/sglang/multimodal_gen/configs/pipeline_configs/wan.py
@@ -214,7 +214,7 @@ class Wan2_2_T2V_A14B_Config(WanT2V480PConfig):
 
 
 @dataclass
-class Wan2_2_I2V_A14B_Config(WanI2V480PConfig):
+class Wan2_2_I2V_A14B_Config(WanI2V720PConfig):
     flow_shift: float | None = 5.0
     boundary_ratio: float | None = 0.900
 
diff --git a/python/sglang/multimodal_gen/runtime/entrypoints/openai/protocol.py b/python/sglang/multimodal_gen/runtime/entrypoints/openai/protocol.py
index 9831d368a..b326a2950 100644
--- a/python/sglang/multimodal_gen/runtime/entrypoints/openai/protocol.py
+++ b/python/sglang/multimodal_gen/runtime/entrypoints/openai/protocol.py
@@ -90,6 +90,8 @@ class VideoGenerationsRequest(BaseModel):
     seed: Optional[int] = 1024
     generator_device: Optional[str] = "cuda"
     # SGLang extensions
+    width: Optional[int] = None
+    height: Optional[int] = None
     num_inference_steps: Optional[int] = None
     guidance_scale: Optional[float] = None
     guidance_scale_2: Optional[float] = None
diff --git a/python/sglang/multimodal_gen/runtime/entrypoints/openai/video_api.py b/python/sglang/multimodal_gen/runtime/entrypoints/openai/video_api.py
index 2a444111d..abccf31bb 100644
--- a/python/sglang/multimodal_gen/runtime/entrypoints/openai/video_api.py
+++ b/python/sglang/multimodal_gen/runtime/entrypoints/openai/video_api.py
@@ -60,6 +60,8 @@ def _build_video_sampling_params(request_id: str, request: VideoGenerationsReque
         request_id,
         prompt=request.prompt,
         size=request.size,
+        width=request.width,
+        height=request.height,
         num_frames=num_frames,
         fps=fps,
         image_path=request.input_reference,
diff --git a/python/sglang/multimodal_gen/runtime/pipelines_core/stages/input_validation.py b/python/sglang/multimodal_gen/runtime/pipelines_core/stages/input_validation.py
index aa0b686b8..fc27f657f 100644
--- a/python/sglang/multimodal_gen/runtime/pipelines_core/stages/input_validation.py
+++ b/python/sglang/multimodal_gen/runtime/pipelines_core/stages/input_validation.py
@@ -191,8 +191,30 @@ class InputValidationStage(PipelineStage):
                 server_args.pipeline_config.vae_config.arch_config.scale_factor_spatial
                 * server_args.pipeline_config.dit_config.arch_config.patch_size[1]
             )
+
+            # User-specified width/height controls the target area (scale),
+            # capped by max_area. Aspect ratio always comes from the
+            # condition image for I2V.
+            if batch.width is not None or batch.height is not None:
+                # If one dimension is provided, calculate the other based on the image's aspect ratio.
+                if batch.width is None:
+                    batch.width = round(batch.height / aspect_ratio)
+                elif batch.height is None:
+                    batch.height = round(batch.width * aspect_ratio)
+
+                target_area = min(batch.width * batch.height, max_area)
+                if batch.width * batch.height > max_area:
+                    logger.warning(
+                        "Requested resolution %dx%d exceeds max_area %d, "
+                        "clamping to max_area",
+                        batch.width,
+                        batch.height,
+                        max_area,
+                    )
+            else:
+                target_area = max_area
             width, height = self._calculate_dimensions_from_area(
-                max_area, aspect_ratio, mod_value
+                target_area, aspect_ratio, mod_value
             )
 
             batch.condition_image = batch.condition_image.resize((width, height))
diff --git a/python/sglang/multimodal_gen/test/run_suite.py b/python/sglang/multimodal_gen/test/run_suite.py
index f7182b9bb..b01120c02 100644
--- a/python/sglang/multimodal_gen/test/run_suite.py
+++ b/python/sglang/multimodal_gen/test/run_suite.py
@@ -35,6 +35,7 @@ SUITES = {
         "../unit/test_storage.py",
         "../unit/test_lora_format_adapter.py",
         "../unit/test_server_args.py",
+        "../unit/test_input_validation.py",
         # add new unit tests here
     ],
     "1-gpu": [
diff --git a/python/sglang/multimodal_gen/test/server/perf_baselines.json b/python/sglang/multimodal_gen/test/server/perf_baselines.json
index 68ee16827..195ae846a 100644
--- a/python/sglang/multimodal_gen/test/server/perf_baselines.json
+++ b/python/sglang/multimodal_gen/test/server/perf_baselines.json
@@ -1317,60 +1317,60 @@
         },
         "wan2_2_i2v_a14b_2gpu": {
             "stages_ms": {
-                "InputValidationStage": 18.45,
-                "TextEncodingStage": 3337.77,
-                "TimestepPreparationStage": 2.9,
-                "LatentPreparationStage": 1.25,
-                "ImageVAEEncodingStage": 1655.89,
-                "DenoisingStage": 106972.82,
-                "DecodingStage": 1355.52,
+                "InputValidationStage": 27.74,
+                "TextEncodingStage": 1121.93,
+                "ImageVAEEncodingStage": 1889.26,
+                "LatentPreparationStage": 0.44,
+                "TimestepPreparationStage": 6.39,
+                "DenoisingStage": 137454.52,
+                "DecodingStage": 2287.25,
                 "per_frame_generation": null
             },
             "denoise_step_ms": {
-                "0": 1525.6,
-                "1": 1582.6,
-                "2": 1597.84,
-                "3": 1601.34,
-                "4": 1600.86,
-                "5": 1598.32,
-                "6": 1600.93,
-                "7": 1599.88,
-                "8": 1600.0,
-                "9": 1600.55,
-                "10": 1599.27,
-                "11": 1600.59,
-                "12": 1600.17,
-                "13": 1599.72,
-                "14": 1599.76,
-                "15": 24098.85,
-                "16": 1601.29,
-                "17": 1598.89,
-                "18": 1600.12,
-                "19": 1600.52,
-                "20": 1599.59,
-                "21": 1600.37,
-                "22": 1600.35,
-                "23": 1599.7,
-                "24": 1599.92,
-                "25": 1599.75,
-                "26": 1600.2,
-                "27": 1600.06,
-                "28": 1600.41,
-                "29": 1599.35,
-                "30": 1600.69,
-                "31": 1600.15,
-                "32": 1599.33,
-                "33": 1599.86,
-                "34": 1600.52,
-                "35": 1599.84,
-                "36": 1600.38,
-                "37": 1599.23,
-                "38": 1600.27,
-                "39": 1599.78
+                "0": 2231.66,
+                "1": 3489.95,
+                "2": 3436.66,
+                "3": 3407.31,
+                "4": 3422.63,
+                "5": 3417.48,
+                "6": 3425.34,
+                "7": 3423.93,
+                "8": 3429.36,
+                "9": 3431.95,
+                "10": 3435.35,
+                "11": 3430.29,
+                "12": 3435.09,
+                "13": 3436.59,
+                "14": 3436.94,
+                "15": 4835.04,
+                "16": 3416.6,
+                "17": 3427.03,
+                "18": 3421.59,
+                "19": 3427.95,
+                "20": 3427.21,
+                "21": 3428.96,
+                "22": 3430.96,
+                "23": 3431.29,
+                "24": 3430.44,
+                "25": 3430.09,
+                "26": 3432.23,
+                "27": 3430.61,
+                "28": 3430.51,
+                "29": 3427.92,
+                "30": 3429.01,
+                "31": 3430.05,
+                "32": 3429.63,
+                "33": 3426.97,
+                "34": 3426.71,
+                "35": 3428.44,
+                "36": 3427.1,
+                "37": 3425.52,
+                "38": 3422.81,
+                "39": 3403.77
             },
-            "expected_e2e_ms": 123182.9887,
-            "expected_avg_denoise_ms": 2831.0,
-            "expected_median_denoise_ms": 1600.09
+            "expected_e2e_ms": 144621.32,
+            "expected_avg_denoise_ms": 3434.22,
+            "expected_median_denoise_ms": 3428.99
         },
         "turbo_wan2_2_i2v_a14b_2gpu": {
             "stages_ms": {
diff --git a/python/sglang/multimodal_gen/test/unit/test_input_validation.py b/python/sglang/multimodal_gen/test/unit/test_input_validation.py
new file mode 100644
index 000000000..75bd30bf7
--- /dev/null
+++ b/python/sglang/multimodal_gen/test/unit/test_input_validation.py
@@ -0,0 +1,164 @@
+"""Unit tests for InputValidationStage.preprocess_condition_image resolution logic."""
+
+import unittest
+from unittest.mock import MagicMock, patch
+
+from PIL import Image
+
+from sglang.multimodal_gen.configs.pipeline_configs.wan import (
+    WanI2V480PConfig,
+    WanI2V720PConfig,
+)
+from sglang.multimodal_gen.configs.sample.sampling_params import SamplingParams
+from sglang.multimodal_gen.runtime.pipelines_core.schedule_batch import Req
+from sglang.multimodal_gen.runtime.pipelines_core.stages.input_validation import (
+    InputValidationStage,
+)
+
+# Patch path for get_global_server_args used by Stage.__init__
+_GLOBAL_ARGS_PATCH = (
+    "sglang.multimodal_gen.runtime.pipelines_core.stages.base.get_global_server_args"
+)
+
+
+def _make_batch(condition_image: Image.Image, width=None, height=None) -> Req:
+    """Create a minimal Req with a condition image and optional user dimensions."""
+    sp = SamplingParams(
+        seed=42,
+        num_outputs_per_prompt=1,
+        width=width,
+        height=height,
+    )
+    batch = Req(sampling_params=sp, condition_image=condition_image)
+    return batch
+
+
+def _make_server_args(pipeline_config):
+    """Create a mock ServerArgs with the given pipeline config."""
+    sa = MagicMock()
+    sa.pipeline_config = pipeline_config
+    return sa
+
+
+class TestCalculateDimensionsFromArea(unittest.TestCase):
+    """Tests for InputValidationStage._calculate_dimensions_from_area."""
+
+    def test_square_aspect_ratio(self):
+        # area=921600, aspect=1.0, mod=16 → sqrt(921600)=~960
+        w, h = InputValidationStage._calculate_dimensions_from_area(921600, 1.0, 16)
+        self.assertEqual(w % 16, 0)
+        self.assertEqual(h % 16, 0)
+        self.assertEqual((w, h), (960, 960))
+
+    def test_16_9_aspect_ratio(self):
+        # aspect = 720/1280 = 0.5625
+        w, h = InputValidationStage._calculate_dimensions_from_area(921600, 9 / 16, 16)
+        self.assertEqual(w % 16, 0)
+        self.assertEqual(h % 16, 0)
+        self.assertEqual((w, h), (1280, 720))
+
+    def test_9_16_aspect_ratio(self):
+        w, h = InputValidationStage._calculate_dimensions_from_area(921600, 16 / 9, 16)
+        self.assertEqual(w % 16, 0)
+        self.assertEqual(h % 16, 0)
+        self.assertEqual((w, h), (720, 1280))
+
+    def test_mod_alignment(self):
+        # Ensure dimensions are always multiples of mod_value
+        w, h = InputValidationStage._calculate_dimensions_from_area(500000, 1.3, 16)
+        self.assertEqual(w % 16, 0)
+        self.assertEqual(h % 16, 0)
+
+
+class TestPreprocessConditionImageResolution(unittest.TestCase):
+    """Tests for the WanI2V480PConfig branch of preprocess_condition_image.
+
+    Verifies that:
+    - Aspect ratio always comes from the condition image
+    - User-specified width/height controls target area (scale)
+    - Output is clamped to max_area when user dimensions exceed it
+    - Dimensions are always mod-aligned
+    """
+
+    def setUp(self):
+        with patch(_GLOBAL_ARGS_PATCH, return_value=MagicMock()):
+            self.stage = InputValidationStage()
+
+    def _run(self, config, img_w, img_h, user_w=None, user_h=None):
+        """Run preprocess_condition_image and return (batch.width, batch.height)."""
+        img = Image.new("RGB", (img_w, img_h), color="red")
+        batch = _make_batch(img, width=user_w, height=user_h)
+        server_args = _make_server_args(config)
+        self.stage.preprocess_condition_image(batch, server_args, img_w, img_h)
+        return batch.width, batch.height
+
+    def test_720p_no_user_dims_16_9_image(self):
+        """16:9 image, no user dims → 1280×720."""
+        w, h = self._run(WanI2V720PConfig(), 1920, 1080)
+        self.assertEqual((w, h), (1280, 720))
+
+    def test_720p_no_user_dims_9_16_image(self):
+        """9:16 image, no user dims → 720×1280."""
+        w, h = self._run(WanI2V720PConfig(), 1080, 1920)
+        self.assertEqual((w, h), (720, 1280))
+
+    def test_720p_no_user_dims_square_image(self):
+        """Square image, no user dims → ~960×960 (max_area=921600, sqrt≈960)."""
+        w, h = self._run(WanI2V720PConfig(), 1024, 1024)
+        self.assertEqual((w, h), (960, 960))
+        self.assertEqual(w % 16, 0)
+
+    def test_720p_user_dims_equal_max_area_16_9_image(self):
+        """16:9 image + user 1280×720 (=max_area) → 1280×720."""
+        w, h = self._run(WanI2V720PConfig(), 1920, 1080, 1280, 720)
+        self.assertEqual((w, h), (1280, 720))
+
+    def test_720p_user_dims_equal_max_area_square_image(self):
+        """Square image + user 1280×720 → still square (~960×960) because
+        aspect ratio comes from image, not from user dimensions."""
+        w, h = self._run(WanI2V720PConfig(), 1024, 1024, 1280, 720)
+        self.assertEqual((w, h), (960, 960))
+
+    def test_720p_user_dims_smaller_area(self):
+        """Square image + user 832×480 → smaller square (target_area=399360)."""
+        w, h = self._run(WanI2V720PConfig(), 1024, 1024, 832, 480)
+        self.assertEqual((w, h), (624, 624))
+        self.assertEqual(w % 16, 0)
+
+    def test_720p_user_dims_exceed_max_area(self):
+        """4K request clamped to max_area."""
+        w, h = self._run(WanI2V720PConfig(), 1920, 1080, 3840, 2160)
+        self.assertEqual(w % 16, 0)
+        self.assertEqual(h % 16, 0)
+        self.assertEqual((w, h), (1280, 720))
+
+    def test_480p_no_user_dims_16_9_image(self):
+        """480p config, 16:9 image → area-based calc from max_area=399360."""
+        w, h = self._run(WanI2V480PConfig(), 1920, 1080)
+        # max_area=480*832=399360, aspect=9/16 → (832, 464) due to rounding
+        self.assertEqual(w % 16, 0)
+        self.assertEqual(h % 16, 0)
+        self.assertEqual((w, h), (832, 464))
+
+    def test_condition_image_resized_to_output_dims(self):
+        """Condition image is resized to match output dimensions."""
+        img = Image.new("RGB", (1920, 1080), color="blue")
+        batch = _make_batch(img)
+        server_args = _make_server_args(WanI2V720PConfig())
+        self.stage.preprocess_condition_image(batch, server_args, 1920, 1080)
+        self.assertEqual(batch.condition_image.size, (batch.width, batch.height))
+
+    def test_list_condition_image_takes_first(self):
+        """List of condition images → uses first one."""
+        img1 = Image.new("RGB", (1920, 1080), color="red")
+        img2 = Image.new("RGB", (800, 600), color="green")
+        batch = _make_batch(img1)
+        batch.condition_image = [img1, img2]
+        server_args = _make_server_args(WanI2V720PConfig())
+        self.stage.preprocess_condition_image(batch, server_args, 1920, 1080)
+        self.assertIsInstance(batch.condition_image, Image.Image)
+        self.assertEqual((batch.width, batch.height), (1280, 720))
+
+
+if __name__ == "__main__":
+    unittest.main()