diff --git a/app/api/realtime/generate/route.ts b/app/api/realtime/generate/route.ts
index 6005d7f1a..56e6b4121 100644
--- a/app/api/realtime/generate/route.ts
+++ b/app/api/realtime/generate/route.ts
@@ -8,6 +8,7 @@ import {
   RealtimeProviderConfig,
   resolveRealtimeProviders,
 } from "@/lib/realtime/config";
+import { ensurePublicImageUrl } from "@/lib/realtime/image-input";
 
 type GeneratePayload = {
   requestId?: string;
@@ -670,11 +671,33 @@ export async function POST(request: Request) {
   }
 
   const providerErrors: string[] = [];
+  const requestOrigin = new URL(request.url).origin;
+  let replicateImageInputPromise: Promise<string> | null = null;
 
   for (const provider of providers) {
+    let providerImageInput = imagePrompt;
+
+    if (provider.type === "replicate") {
+      try {
+        replicateImageInputPromise =
+          replicateImageInputPromise ||
+          ensurePublicImageUrl({
+            imageUrl,
+            prefix: "realtime-replicate-input",
+            requestOrigin,
+          });
+        providerImageInput = await replicateImageInputPromise;
+      } catch (error) {
+        const message =
+          error instanceof Error ? error.message : "实时画布输入图上传失败";
+        providerErrors.push(`${provider.label}（${provider.baseUrl}）: ${message}`);
+        continue;
+      }
+    }
+
     const result = await generateWithProvider({
       provider,
-      imagePrompt,
+      imagePrompt: providerImageInput,
       prompt: positivePrompt,
       size,
       seed,
diff --git a/lib/realtime/image-input.ts b/lib/realtime/image-input.ts
new file mode 100644
index 000000000..eecadefb3
--- /dev/null
+++ b/lib/realtime/image-input.ts
@@ -0,0 +1,92 @@
+import "server-only";
+
+import { uploadFile } from "@/lib/storage/service";
+
+const DATA_IMAGE_URL_PATTERN = /^data:(image\/[a-z0-9.+-]+);base64,([a-z0-9+/=\s]+)$/i;
+
+const MIME_TYPE_EXTENSION_MAP: Record<string, string> = {
+  "image/jpeg": "jpg",
+  "image/jpg": "jpg",
+  "image/png": "png",
+  "image/webp": "webp",
+  "image/gif": "gif",
+  "image/bmp": "bmp",
+  "image/tiff": "tiff",
+  "image/svg+xml": "svg",
+};
+
+function normalizeImageMimeType(mimeType: string) {
+  return String(mimeType || "").trim().toLowerCase();
+}
+
+function resolveImageExtension(mimeType: string) {
+  const normalized = normalizeImageMimeType(mimeType);
+  return MIME_TYPE_EXTENSION_MAP[normalized] || normalized.split("/")[1] || "png";
+}
+
+function toArrayBuffer(buffer: Buffer) {
+  return buffer.buffer.slice(
+    buffer.byteOffset,
+    buffer.byteOffset + buffer.byteLength
+  ) as ArrayBuffer;
+}
+
+export function parseDataImageUrl(raw: string) {
+  const trimmed = String(raw || "").trim();
+  const match = trimmed.match(DATA_IMAGE_URL_PATTERN);
+  if (!match) return null;
+
+  const mimeType = normalizeImageMimeType(match[1]);
+  const base64Payload = match[2].replace(/\s+/g, "");
+
+  return {
+    mimeType,
+    base64Payload,
+    extension: resolveImageExtension(mimeType),
+  };
+}
+
+export async function uploadDataImageUrl(params: {
+  imageUrl: string;
+  prefix: string;
+}) {
+  const parsed = parseDataImageUrl(params.imageUrl);
+  if (!parsed) {
+    throw new Error("图片必须是有效的 data:image;base64 格式");
+  }
+
+  const buffer = Buffer.from(parsed.base64Payload, "base64");
+  const filename = `${params.prefix}-${Date.now()}-${Math.random()
+    .toString(36)
+    .slice(2, 8)}.${parsed.extension}`;
+  const uploaded = await uploadFile(filename, toArrayBuffer(buffer));
+  return uploaded.url;
+}
+
+export async function ensurePublicImageUrl(params: {
+  imageUrl: string;
+  prefix: string;
+  requestOrigin?: string;
+}) {
+  const trimmed = String(params.imageUrl || "").trim();
+  if (!trimmed) {
+    throw new Error("缺少输入图片");
+  }
+
+  if (/^https?:\/\//i.test(trimmed)) {
+    return trimmed;
+  }
+
+  if (params.requestOrigin && trimmed.startsWith("/")) {
+    return new URL(trimmed, params.requestOrigin).toString();
+  }
+
+  if (trimmed.startsWith("data:")) {
+    return uploadDataImageUrl({
+      imageUrl: trimmed,
+      prefix: params.prefix,
+    });
+  }
+
+  throw new Error("图片必须是公网 URL、站内相对路径或 data:image;base64");
+}
diff --git a/lib/realtime/replicate-capability.ts b/lib/realtime/replicate-capability.ts
index 146611547..f5c90aebe 100644
--- a/lib/realtime/replicate-capability.ts
+++ b/lib/realtime/replicate-capability.ts
@@ -1,4 +1,5 @@
 import sharp from "sharp";
+import { ensurePublicImageUrl } from "@/lib/realtime/image-input";
 
 const DEFAULT_REPLICATE_BASE_URL = "https://api.replicate.com/v1";
 const DEFAULT_REPLICATE_MODEL = "black-forest-labs/flux-2-klein-4b";
@@ -24,7 +25,7 @@ type ReplicateProbeParams = {
   timeoutMs?: number;
 };
 
-let cachedProbeImageDataUri: string | null = null;
+let cachedProbeImageUrl: string | null = null;
 
 function trimString(value: unknown) {
   return String(value || "").trim();
@@ -78,8 +79,8 @@ function shouldRetryWithAltField(message: string) {
   );
 }
 
-async function getProbeImageDataUri() {
-  if (cachedProbeImageDataUri) return cachedProbeImageDataUri;
+async function getProbeImageUrl() {
+  if (cachedProbeImageUrl) return cachedProbeImageUrl;
 
   const buffer = await sharp({
     create: {
@@ -92,8 +93,11 @@ async function getProbeImageDataUri() {
     .png()
     .toBuffer();
 
-  cachedProbeImageDataUri = `data:image/png;base64,${buffer.toString("base64")}`;
-  return cachedProbeImageDataUri;
+  cachedProbeImageUrl = await ensurePublicImageUrl({
+    imageUrl: `data:image/png;base64,${buffer.toString("base64")}`,
+    prefix: "realtime-replicate-probe",
+  });
+  return cachedProbeImageUrl;
 }
 
 async function createPrediction(params: {
@@ -144,7 +148,7 @@ export async function probeReplicateModelSupport(
   );
 
   try {
-    const image = await getProbeImageDataUri();
+    const image = await getProbeImageUrl();
     const candidateInputs = [
       { prompt: "white square photo", images: [image] },
       { prompt: "white square photo", image },