diff --git a/app/src/components/SceneCanvas.tsx b/app/src/components/SceneCanvas.tsx
index b554703..fca7dc9 100644
--- a/app/src/components/SceneCanvas.tsx
+++ b/app/src/components/SceneCanvas.tsx
@@ -41,6 +41,7 @@ function CanvasInner({ fallback: _, shadows, ...canvasProps }: SceneCanvasProps)
   return (
     <Canvas
       frameloop="demand"
+      gl={{ preserveDrawingBuffer: true }}
       {...canvasProps}
       shadows={shadowConfig}
       onCreated={(state) => {
diff --git a/app/src/lib/canvas-capture.ts b/app/src/lib/canvas-capture.ts
index 5a20676..ce1f952 100644
--- a/app/src/lib/canvas-capture.ts
+++ b/app/src/lib/canvas-capture.ts
@@ -73,9 +73,8 @@ export async function captureCanvasImage(
     outW = Math.round((outH / srcH) * srcW);
   }
 
-  if (outW === srcW && outH === srcH) {
-    return canvasToDataURL(canvas, format, quality);
-  }
+  // Removido o short-circuit (outW === srcW) para forçar a passagem pelo canvas 2D
+  // e garantir que o fundo transparente seja preenchido de branco.
 
   const off = document.createElement('canvas');
   off.width = outW;
@@ -85,6 +84,11 @@ export async function captureCanvasImage(
 
   ctx.imageSmoothingEnabled = true;
   ctx.imageSmoothingQuality = 'high';
+  
+  // Preencher fundo com branco para evitar preto em áreas transparentes (especialmente em JPEGs ou PDFs)
+  ctx.fillStyle = '#ffffff';
+  ctx.fillRect(0, 0, outW, outH);
+  
   ctx.drawImage(canvas, 0, 0, outW, outH);
 
   return off.toDataURL(`image/${format}`, quality);