diff --git a/src/App.tsx b/src/App.tsx
index 5b9a82b..fb22c04 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -42,6 +42,7 @@ import code, {
   PageMetadata,
   StructuredDataOptions,
   BrandingOptions,
+  SocialPreviewOptions,
   SeoOptions,
   AnalyticsOptions,
   CachingOptions,
@@ -155,6 +156,13 @@ export default function App() {
     twitterHandle: "",
     faviconUrl: "",
   });
+  const [socialPreview, setSocialPreview] = useState<SocialPreviewOptions>({
+    defaultImage: "",
+    imageWidth: 1200,
+    imageHeight: 630,
+    twitterCardType: "summary_large_image",
+    locale: "",
+  });
   const [seo, setSeo] = useState<SeoOptions>({
     aiAttribution: "",
   });
@@ -279,6 +287,17 @@ export default function App() {
     setCopied(false);
   }
 
+  function handleSocialPreviewChange(
+    field: keyof SocialPreviewOptions,
+    value: string | number,
+  ): void {
+    setSocialPreview({
+      ...socialPreview,
+      [field]: value,
+    });
+    setCopied(false);
+  }
+
   function handleSeoChange(field: keyof SeoOptions, value: string): void {
     setSeo({
       ...seo,
@@ -442,6 +461,7 @@ export default function App() {
     pageMetadata,
     structuredData,
     branding,
+    socialPreview,
     seo,
     analytics,
     caching,
@@ -930,6 +950,99 @@ export default function App() {
                 />
               </Box>
 
+              <Box sx={{ mt: 3, pt: 2, borderTop: 1, borderColor: "grey.300" }}>
+                <Typography
+                  variant="subtitle2"
+                  color="text.secondary"
+                  gutterBottom
+                >
+                  Social Preview
+                </Typography>
+                <TextField
+                  fullWidth
+                  label="Default OG Image URL"
+                  margin="dense"
+                  placeholder="https://example.com/og-image.jpg"
+                  helperText="Fallback image for pages without a specific OG image"
+                  onChange={(e) =>
+                    handleSocialPreviewChange("defaultImage", e.target.value)
+                  }
+                  value={socialPreview.defaultImage}
+                  variant="outlined"
+                  size="small"
+                />
+                <Stack direction="row" spacing={2}>
+                  <TextField
+                    type="number"
+                    label="Image Width"
+                    margin="dense"
+                    placeholder="1200"
+                    helperText="og:image:width"
+                    onChange={(e) =>
+                      handleSocialPreviewChange(
+                        "imageWidth",
+                        Number(e.target.value),
+                      )
+                    }
+                    value={socialPreview.imageWidth}
+                    variant="outlined"
+                    size="small"
+                    sx={{ flex: 1 }}
+                  />
+                  <TextField
+                    type="number"
+                    label="Image Height"
+                    margin="dense"
+                    placeholder="630"
+                    helperText="og:image:height"
+                    onChange={(e) =>
+                      handleSocialPreviewChange(
+                        "imageHeight",
+                        Number(e.target.value),
+                      )
+                    }
+                    value={socialPreview.imageHeight}
+                    variant="outlined"
+                    size="small"
+                    sx={{ flex: 1 }}
+                  />
+                </Stack>
+                <FormControl fullWidth size="small" margin="dense">
+                  <InputLabel id="twitterCardTypeLabel">
+                    Twitter Card Type
+                  </InputLabel>
+                  <Select
+                    labelId="twitterCardTypeLabel"
+                    label="Twitter Card Type"
+                    value={socialPreview.twitterCardType}
+                    onChange={(e) =>
+                      handleSocialPreviewChange(
+                        "twitterCardType",
+                        e.target.value,
+                      )
+                    }
+                  >
+                    <MenuItem value="summary_large_image">
+                      summary_large_image (recommended)
+                    </MenuItem>
+                    <MenuItem value="summary">summary</MenuItem>
+                  </Select>
+                </FormControl>
+                <TextField
+                  fullWidth
+                  label="Locale"
+                  margin="dense"
+                  placeholder="en_US, ja_JP, etc."
+                  helperText="og:locale for language targeting"
+                  onChange={(e) =>
+                    handleSocialPreviewChange("locale", e.target.value)
+                  }
+                  value={socialPreview.locale}
+                  variant="outlined"
+                  size="small"
+                />
+              </Box>
+
               <Box sx={{ mt: 3, pt: 2, borderTop: 1, borderColor: "grey.300" }}>
                 <Typography
                   variant="subtitle2"
diff --git a/src/code.ts b/src/code.ts
index fca3bd2..9a450e2 100644
--- a/src/code.ts
+++ b/src/code.ts
@@ -30,6 +30,14 @@ export interface BrandingOptions {
   faviconUrl?: string;
 }
 
+export interface SocialPreviewOptions {
+  defaultImage?: string;
+  imageWidth?: number;
+  imageHeight?: number;
+  twitterCardType?: "summary" | "summary_large_image";
+  locale?: string;
+}
+
 export interface SeoOptions {
   aiAttribution?: string;
 }
@@ -78,6 +86,7 @@ export interface CodeData {
   pageMetadata: Record<string, PageMetadata>;
   structuredData: StructuredDataOptions;
   branding: BrandingOptions;
+  socialPreview: SocialPreviewOptions;
   seo: SeoOptions;
   analytics: AnalyticsOptions;
   caching: CachingOptions;
@@ -111,6 +120,7 @@ export default function code(data: CodeData): string {
     pageMetadata,
     structuredData,
     branding,
+    socialPreview,
     seo,
     analytics,
     caching,
@@ -170,6 +180,16 @@ ${slugs
   const TWITTER_HANDLE = '${branding?.twitterHandle || ""}';
   const FAVICON_URL = '${branding?.faviconUrl || ""}';
 
+  /*
+   * Step 3.3.1: social preview configuration (optional)
+   * Enhance Open Graph and Twitter Card meta tags for better link previews
+   */
+  const DEFAULT_OG_IMAGE = '${socialPreview?.defaultImage || ""}';
+  const OG_IMAGE_WIDTH = ${socialPreview?.imageWidth || 1200};
+  const OG_IMAGE_HEIGHT = ${socialPreview?.imageHeight || 630};
+  const TWITTER_CARD_TYPE = '${socialPreview?.twitterCardType || "summary_large_image"}';
+  const OG_LOCALE = '${socialPreview?.locale || ""}';
+
   /*
    * Step 3.4: SEO configuration (optional)
    * AI attribution for proper citation in AI-generated content
@@ -582,10 +602,11 @@ ${
           element.setAttribute('content', pageDescription);
         }
       }
-      // Set custom OG image if specified (Issue #11)
-      if (ogImage && (element.getAttribute('property') === 'og:image'
+      // Set custom OG image if specified, fallback to default (Issue #11, #34)
+      const effectiveOgImage = ogImage || DEFAULT_OG_IMAGE;
+      if (effectiveOgImage && (element.getAttribute('property') === 'og:image'
         || element.getAttribute('name') === 'twitter:image')) {
-        element.setAttribute('content', ogImage);
+        element.setAttribute('content', effectiveOgImage);
       }
       // Set canonical URL for og:url and twitter:url (Issue #9)
       if (element.getAttribute('property') === 'og:url'
@@ -666,6 +687,22 @@ ${
         element.append(\`<meta name="twitter:creator" content="\${TWITTER_HANDLE}">\`, { html: true });
       }
 
+      // Add enhanced Open Graph and Twitter Card tags (Issue #34)
+      element.append(\`<meta property="og:type" content="website">\`, { html: true });
+      element.append(\`<meta name="twitter:card" content="\${TWITTER_CARD_TYPE}">\`, { html: true });
+
+      // Add OG image dimensions if image is set
+      const effectiveOgImage = this.metadata.ogImage || DEFAULT_OG_IMAGE;
+      if (effectiveOgImage) {
+        element.append(\`<meta property="og:image:width" content="\${OG_IMAGE_WIDTH}">\`, { html: true });
+        element.append(\`<meta property="og:image:height" content="\${OG_IMAGE_HEIGHT}">\`, { html: true });
+      }
+
+      // Add locale if configured
+      if (OG_LOCALE !== '') {
+        element.append(\`<meta property="og:locale" content="\${OG_LOCALE}">\`, { html: true });
+      }
+
       // Add AI crawler attribution meta tags (Issue #13)
       if (AI_ATTRIBUTION !== '') {
         element.append(\`<meta name="ai:source_url" content="\${canonicalUrl}">\`, { html: true });