diff --git a/api/onnx_web/chain/tile.py b/api/onnx_web/chain/tile.py
index a6705e5c..01ea9f2b 100644
--- a/api/onnx_web/chain/tile.py
+++ b/api/onnx_web/chain/tile.py
@@ -266,6 +266,7 @@ def process_tile_stack(
 
     tiles: List[Tuple[int, int, Image.Image]] = []
     tile_coords = tile_generator(width, height, tile, overlap)
+    single_tile = len(tile_coords) == 1
 
     for counter, (left, top) in enumerate(tile_coords):
         logger.info(
@@ -291,7 +292,12 @@ def process_tile_stack(
             needs_margin = True
             bottom_margin = height - bottom
 
-        if needs_margin:
+        if single_tile:
+            logger.debug("using single tile")
+            tile_stack = sources
+            if mask:
+                tile_mask = mask
+        elif needs_margin:
             logger.debug(
                 "tiling with added margins: %s, %s, %s, %s",
                 left_margin,
diff --git a/api/onnx_web/diffusers/load.py b/api/onnx_web/diffusers/load.py
index 7e78ab62..49c89f8a 100644
--- a/api/onnx_web/diffusers/load.py
+++ b/api/onnx_web/diffusers/load.py
@@ -229,9 +229,7 @@ def load_pipeline(
                 tokenizer_2=components.get("tokenizer_2", None),
             )
         else:
-            logger.debug(
-                "assembling SD pipeline for %s", pipeline_class.__name__
-            )
+            logger.debug("assembling SD pipeline for %s", pipeline_class.__name__)
 
             if pipeline_class == OnnxStableDiffusionUpscalePipeline:
                 # upscale uses a single VAE
diff --git a/api/onnx_web/diffusers/pipelines/upscale.py b/api/onnx_web/diffusers/pipelines/upscale.py
index 2fb3a2e1..aa07cc99 100644
--- a/api/onnx_web/diffusers/pipelines/upscale.py
+++ b/api/onnx_web/diffusers/pipelines/upscale.py
@@ -2,7 +2,9 @@ from logging import getLogger
 from typing import Any, List
 
 from diffusers.pipelines.onnx_utils import OnnxRuntimeModel
-from diffusers.pipelines.stable_diffusion import OnnxStableDiffusionUpscalePipeline as BasePipeline
+from diffusers.pipelines.stable_diffusion import (
+    OnnxStableDiffusionUpscalePipeline as BasePipeline,
+)
 from diffusers.schedulers import DDPMScheduler
 
 logger = getLogger(__name__)