diff --git a/packages/sdk/src/core/widgets/iframe.ts b/packages/sdk/src/core/widgets/iframe.ts
index e246fd0..bb6eaa5 100644
--- a/packages/sdk/src/core/widgets/iframe.ts
+++ b/packages/sdk/src/core/widgets/iframe.ts
@@ -1,5 +1,5 @@
 import type { IframeWidgetNode } from '../schema';
-import { pickUrlLike } from './urlLike';
+import { normalizeUrlLike, pickUrlLike } from './urlLike';
 
 /**
  * goView iframe option shape varies across versions.
@@ -209,16 +209,16 @@ function pickSrc(option: GoViewIframeOption): string {
   if (url) {
     if (looksLikeHtml(url)) {
       const extracted = extractSrcFromEmbedHtml(url);
-      return extracted || toDataHtmlUrl(url);
+      return extracted ? normalizeUrlLike(extracted) : toDataHtmlUrl(url);
     }
-    return url;
+    return normalizeUrlLike(url);
   }
 
   // 2) Some exports store raw HTML instead of a URL.
   const html = pickHtmlString(option);
   if (html) {
     const extracted = extractSrcFromEmbedHtml(html);
-    return extracted || toDataHtmlUrl(html);
+    return extracted ? normalizeUrlLike(extracted) : toDataHtmlUrl(html);
   }
 
   // 3) List-ish shapes.
@@ -237,9 +237,9 @@ function pickSrc(option: GoViewIframeOption): string {
   if (!listUrl) return '';
   if (looksLikeHtml(listUrl)) {
     const extracted = extractSrcFromEmbedHtml(listUrl);
-    return extracted || toDataHtmlUrl(listUrl);
+    return extracted ? normalizeUrlLike(extracted) : toDataHtmlUrl(listUrl);
   }
-  return listUrl;
+  return normalizeUrlLike(listUrl);
 }
 
 function pickFit(option: GoViewIframeOption): IframeWidgetNode['props']['fit'] | undefined {
diff --git a/packages/sdk/src/core/widgets/urlLike.ts b/packages/sdk/src/core/widgets/urlLike.ts
index e0d9d57..4eff40e 100644
--- a/packages/sdk/src/core/widgets/urlLike.ts
+++ b/packages/sdk/src/core/widgets/urlLike.ts
@@ -10,7 +10,31 @@
  * - nested objects under `data` / `config` / `options`
  */
 export function pickUrlLike(input: unknown, maxDepth = 3): string {
-  return pickUrlLikeInner(input, maxDepth);
+  const raw = pickUrlLikeInner(input, maxDepth);
+  return normalizeUrlLike(raw);
+}
+
+/**
+ * Normalize URL-ish strings from low-code exports.
+ *
+ * Common cases:
+ * - protocol-relative URLs (//example.com) → https://example.com
+ * - "www.example.com" → https://www.example.com
+ */
+export function normalizeUrlLike(url: string): string {
+  const s = url.trim();
+  if (!s) return '';
+
+  // Don't touch data URLs, streaming protocols, or explicit protocols.
+  if (/^(data:|rtsp:\/\/|rtmp:\/\/|https?:\/\/)/i.test(s)) return s;
+
+  // protocol-relative URLs
+  if (s.startsWith('//')) return `https:${s}`;
+
+  // bare hostnames
+  if (/^www\./i.test(s)) return `https://${s}`;
+
+  return s;
 }
 
 function looksLikeJsonString(input: string): boolean {
diff --git a/packages/sdk/src/core/widgets/video.ts b/packages/sdk/src/core/widgets/video.ts
index 6825e61..105b3bb 100644
--- a/packages/sdk/src/core/widgets/video.ts
+++ b/packages/sdk/src/core/widgets/video.ts
@@ -1,5 +1,5 @@
 import type { VideoWidgetNode } from '../schema';
-import { pickUrlLike } from './urlLike';
+import { normalizeUrlLike, pickUrlLike } from './urlLike';
 
 /**
  * goView video option shape varies across versions.
@@ -221,9 +221,9 @@ function pickFirstUrlFromList(input: unknown): string {
 
 function normalizeSrcMaybeFromHtml(raw: string): string {
   if (!raw) return '';
-  if (!looksLikeHtml(raw)) return raw;
+  if (!looksLikeHtml(raw)) return normalizeUrlLike(raw);
   const extracted = extractSrcFromVideoHtml(raw);
-  return extracted || raw;
+  return extracted ? normalizeUrlLike(extracted) : raw;
 }
 
 function pickSrc(option: GoViewVideoOption): string {