diff --git a/server/index.ts b/server/index.ts
index 4caf8bc..1c7f369 100644
--- a/server/index.ts
+++ b/server/index.ts
@@ -7,6 +7,7 @@
  */
 
 import { resolve } from "node:path";
+import sharp from "sharp";
 import { Hono } from "hono";
 import { cors } from "hono/cors";
 import type { ServerWebSocket } from "bun";
@@ -738,22 +739,27 @@ async function process3DGenJob(job: Gen3DJob) {
 	const MODEL = "fal-ai/hunyuan3d-v21";
 
 	try {
-		// 1. Read staged image from disk and convert to data URI for reliable fal.ai delivery
+		// 1. Resize staged image with sharp (max 1024px) for reliable fal.ai processing
 		let imageInput = job.imageUrl;
 		const stagedMatch = job.imageUrl.match(/\/(?:api\/files|data\/files)\/generated\/([^?#]+)/);
 		if (stagedMatch) {
 			try {
 				const dir = resolve(process.env.FILES_DIR || "./data/files", "generated");
-				const file = Bun.file(resolve(dir, stagedMatch[1]));
+				const srcPath = resolve(dir, stagedMatch[1]);
+				const file = Bun.file(srcPath);
 				if (await file.exists()) {
-					const buf = Buffer.from(await file.arrayBuffer());
-					const ext = stagedMatch[1].split(".").pop()?.toLowerCase() || "jpg";
-					const mime = ext === "png" ? "image/png" : ext === "webp" ? "image/webp" : "image/jpeg";
-					imageInput = `data:${mime};base64,${buf.toString("base64")}`;
-					console.log(`[3d-gen] Using data URI (${Math.round(buf.length / 1024)}KB) instead of URL`);
+					const resizedBuf = await sharp(srcPath)
+						.resize(1024, 1024, { fit: "inside", withoutEnlargement: true })
+						.jpeg({ quality: 90 })
+						.toBuffer();
+					const resizedName = `stage-resized-${Date.now()}-${Math.random().toString(36).slice(2, 6)}.jpg`;
+					await Bun.write(resolve(dir, resizedName), resizedBuf);
+					// Use public HTTPS URL for the resized image
+					imageInput = `${PUBLIC_ORIGIN}/api/files/generated/${resizedName}`;
+					console.log(`[3d-gen] Resized image: ${Math.round(resizedBuf.length / 1024)}KB → ${imageInput}`);
 				}
 			} catch (e: any) {
-				console.warn(`[3d-gen] Data URI fallback failed, using URL:`, e.message);
+				console.warn(`[3d-gen] Resize failed, using original URL:`, e.message);
 			}
 		}