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diff --git a/scripts/gates/check-og-tool-images.js b/scripts/gates/check-og-tool-images.js
index ea55deea..fa8fad29 100644
--- a/scripts/gates/check-og-tool-images.js
+++ b/scripts/gates/check-og-tool-images.js
@@ -2,23 +2,70 @@
 
 import fs from "node:fs";
 import {
-    getAllToolOgTargets,
+    findUnexpectedOgImages,
+    getAllOgTargets,
+    getJpegDimensions,
+    MAX_OG_IMAGE_BYTES,
+    OG_IMAGE_HEIGHT,
+    OG_IMAGE_WIDTH,
 } from "../lib/og-tool-images-lib.js";
 
 const missing = [];
+const wrongDimensions = [];
+const tooLarge = [];
+const unexpected = findUnexpectedOgImages();
 
-for (const target of getAllToolOgTargets()) {
+for (const target of getAllOgTargets()) {
     if (!fs.existsSync(target.outputPath)) {
         missing.push(target.outputPath);
+        continue;
     }
+
+    const dimensions = getJpegDimensions(target.outputPath);
+    if (!dimensions || dimensions.width !== OG_IMAGE_WIDTH || dimensions.height !== OG_IMAGE_HEIGHT) {
+        wrongDimensions.push({
+            file: target.outputPath,
+            dimensions,
+        });
+    }
+
+    const size = fs.statSync(target.outputPath).size;
+    if (size > MAX_OG_IMAGE_BYTES) {
+        tooLarge.push({ file: target.outputPath, size });
+    }
+}
+
+if (unexpected.length > 0) {
+    console.error(`[check:og-tool-images] Found ${unexpected.length} stale or unexpected OG image(s). Remove them or run \`npm run generate:og-tool-images\`.`);
+    for (const file of unexpected.slice(0, 40)) {
+        console.error(`- ${file}`);
+    }
+    process.exit(1);
 }
 
 if (missing.length > 0) {
-    console.error(`[check:og-tool-images] Missing ${missing.length} tool OG image(s). Run \`npm run generate:og-tool-images\`.`);
+    console.error(`[check:og-tool-images] Missing ${missing.length} OG image(s). Run \`npm run generate:og-tool-images\`.`);
     for (const file of missing.slice(0, 40)) {
         console.error(`- ${file}`);
     }
     process.exit(1);
 }
 
-console.log("[check:og-tool-images] OK: localized tool OG images are present.");
+if (wrongDimensions.length > 0) {
+    console.error(`[check:og-tool-images] ${wrongDimensions.length} OG image(s) have invalid dimensions. Expected ${OG_IMAGE_WIDTH}x${OG_IMAGE_HEIGHT}.`);
+    for (const item of wrongDimensions.slice(0, 40)) {
+        const actual = item.dimensions ? `${item.dimensions.width}x${item.dimensions.height}` : "unreadable";
+        console.error(`- ${item.file}: ${actual}`);
+    }
+    process.exit(1);
+}
+
+if (tooLarge.length > 0) {
+    console.error(`[check:og-tool-images] ${tooLarge.length} OG image(s) exceed ${MAX_OG_IMAGE_BYTES} bytes.`);
+    for (const item of tooLarge.slice(0, 40)) {
+        console.error(`- ${item.file}: ${item.size} bytes`);
+    }
+    process.exit(1);
+}
+
+console.log(`[check:og-tool-images] OK: ${getAllOgTargets().length} localized OG image(s) are present and ${OG_IMAGE_WIDTH}x${OG_IMAGE_HEIGHT}.`);
diff --git a/scripts/generators/generate-og-tool-images.js b/scripts/generators/generate-og-tool-images.js
index 0fdacbca..c0ea426b 100644
--- a/scripts/generators/generate-og-tool-images.js
+++ b/scripts/generators/generate-og-tool-images.js
@@ -3,18 +3,31 @@
 import { chromium } from "playwright";
 import {
     ensureOgDirectories,
+    getDefaultOgTargets,
     getAllToolOgTargets,
+    removeUnexpectedOgImages,
+    renderDefaultOgCardHtml,
     renderToolOgCardHtml,
 } from "../lib/og-tool-images-lib.js";
 
 async function run() {
     ensureOgDirectories();
+    const removedStaleImages = removeUnexpectedOgImages();
     const browser = await chromium.launch({ headless: true });
     const page = await browser.newPage({ viewport: { width: 1200, height: 630 }, deviceScaleFactor: 1 });
-    const targets = getAllToolOgTargets();
+    const targets = [
+        ...getDefaultOgTargets().map((target) => ({
+            ...target,
+            html: renderDefaultOgCardHtml(target.card),
+        })),
+        ...getAllToolOgTargets().map((target) => ({
+            ...target,
+            html: renderToolOgCardHtml(target.card),
+        })),
+    ];
 
     for (const target of targets) {
-        await page.setContent(renderToolOgCardHtml(target.card), { waitUntil: "load" });
+        await page.setContent(target.html, { waitUntil: "load" });
         await page.screenshot({
             path: target.outputPath,
             type: "jpeg",
@@ -23,7 +36,8 @@ async function run() {
     }
 
     await browser.close();
-    console.log(`[generate:og-tool-images] OK: generated ${targets.length} localized tool OG image(s).`);
+    const staleMessage = removedStaleImages.length > 0 ? ` Removed ${removedStaleImages.length} stale image(s).` : "";
+    console.log(`[generate:og-tool-images] OK: generated ${targets.length} localized OG image(s).${staleMessage}`);
 }
 
 run().catch((error) => {
diff --git a/scripts/lib/og-tool-images-lib.js b/scripts/lib/og-tool-images-lib.js
index 14b2652e..17b11ddf 100644
--- a/scripts/lib/og-tool-images-lib.js
+++ b/scripts/lib/og-tool-images-lib.js
@@ -6,9 +6,45 @@ const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const ROOT_DIR = path.join(__dirname, "../..");
 const TOOL_INDEX_PATH = path.join(ROOT_DIR, "src/generated/tool-index.json");
 const TRANSLATIONS_DIR = path.join(ROOT_DIR, "src/core/i18n/translations");
-const OUTPUT_ROOT = path.join(ROOT_DIR, "public/og/tools");
+const OUTPUT_ROOT = path.join(ROOT_DIR, "public/og");
+const TOOL_OUTPUT_ROOT = path.join(OUTPUT_ROOT, "tools");
+const DEFAULT_OUTPUT_ROOT = path.join(OUTPUT_ROOT, "default");
 
 export const OG_IMAGE_LOCALES = ["en", "zh-CN", "zh-TW", "ja", "ko", "de", "fr"];
+export const OG_IMAGE_WIDTH = 1200;
+export const OG_IMAGE_HEIGHT = 630;
+export const MAX_OG_IMAGE_BYTES = 250_000;
+
+const DEFAULT_CARD_COPY = {
+    en: {
+        badge: "Privacy-first",
+        tagline: "Local-first developer tools",
+    },
+    "zh-CN": {
+        badge: "隐私优先",
+        tagline: "本地优先开发者工具",
+    },
+    "zh-TW": {
+        badge: "隱私優先",
+        tagline: "本地優先開發者工具",
+    },
+    ja: {
+        badge: "プライバシー重視",
+        tagline: "ローカル優先の開発者ツール",
+    },
+    ko: {
+        badge: "개인정보 우선",
+        tagline: "로컬 우선 개발자 도구",
+    },
+    de: {
+        badge: "Datenschutzfreundlich",
+        tagline: "Lokale Entwickler-Tools",
+    },
+    fr: {
+        badge: "Respect de la vie privée",
+        tagline: "Outils développeur locaux",
+    },
+};
 
 const CATEGORY_LABEL_KEY = {
     formatters: "formatters",
@@ -47,6 +83,7 @@ function getToolCardData(locale, tool) {
     const translation = loadTranslations(locale);
     const toolTranslation = translation.tools?.[tool.key];
     const navTranslation = translation.nav ?? {};
+    const defaultCopy = DEFAULT_CARD_COPY[locale];
 
     if (!toolTranslation?.title || !toolTranslation?.description) {
         throw new Error(`[og-tool-images] Missing tools.${tool.key}.title/description for ${locale}`);
@@ -58,17 +95,53 @@ function getToolCardData(locale, tool) {
         title: clampText(toolTranslation.title, 72),
         description: clampText(toolTranslation.description, 180),
         category: navTranslation[CATEGORY_LABEL_KEY[tool.category]] ?? tool.category,
+        tagline: defaultCopy.tagline,
+    };
+}
+
+function getDefaultCardData(locale) {
+    const translation = loadTranslations(locale);
+    const defaultCopy = DEFAULT_CARD_COPY[locale];
+
+    if (!translation.site?.title || !translation.site?.description) {
+        throw new Error(`[og-tool-images] Missing site.title/site.description for ${locale}`);
+    }
+
+    return {
+        locale,
+        slug: "default",
+        title: clampText(translation.site.title, 72),
+        description: clampText(translation.site.description, 180),
+        category: defaultCopy.badge,
+        tagline: defaultCopy.tagline,
     };
 }
 
 export function getToolOgImagePath(locale, slug) {
-    return path.join(OUTPUT_ROOT, locale, `${slug}.jpg`);
+    return path.join(TOOL_OUTPUT_ROOT, locale, `${slug}.jpg`);
 }
 
 export function getToolOgImageUrl(locale, slug) {
     return `https://byteflow.tools/og/tools/${locale}/${slug}.jpg`;
 }
 
+export function getDefaultOgImagePath(locale) {
+    return path.join(DEFAULT_OUTPUT_ROOT, `${locale}.jpg`);
+}
+
+export function getDefaultOgImageUrl(locale) {
+    return `https://byteflow.tools/og/default/${locale}.jpg`;
+}
+
+export function getDefaultOgTargets() {
+    return OG_IMAGE_LOCALES.map((locale) => ({
+        locale,
+        slug: "default",
+        outputPath: getDefaultOgImagePath(locale),
+        card: getDefaultCardData(locale),
+    }));
+}
+
 export function getAllToolOgTargets() {
     return loadToolIndex().flatMap((tool) =>
         OG_IMAGE_LOCALES.map((locale) => ({
@@ -80,7 +153,69 @@ export function getAllToolOgTargets() {
     );
 }
 
-export function renderToolOgCardHtml({ locale, category, title, description }) {
+export function getAllOgTargets() {
+    return [
+        ...getDefaultOgTargets(),
+        ...getAllToolOgTargets(),
+    ];
+}
+
+function walkJpegFiles(dir) {
+    if (!fs.existsSync(dir)) return [];
+
+    const files = [];
+    for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
+        const entryPath = path.join(dir, entry.name);
+        if (entry.isDirectory()) {
+            files.push(...walkJpegFiles(entryPath));
+        } else if (entry.isFile() && entry.name.endsWith(".jpg")) {
+            files.push(entryPath);
+        }
+    }
+    return files;
+}
+
+export function findUnexpectedOgImages() {
+    const expectedPaths = new Set(getAllOgTargets().map((target) => path.resolve(target.outputPath)));
+    return walkJpegFiles(OUTPUT_ROOT)
+        .filter((filePath) => !expectedPaths.has(path.resolve(filePath)))
+        .sort((a, b) => a.localeCompare(b));
+}
+
+export function removeUnexpectedOgImages() {
+    const unexpectedImages = findUnexpectedOgImages();
+    for (const filePath of unexpectedImages) {
+        fs.unlinkSync(filePath);
+    }
+    return unexpectedImages;
+}
+
+export function getJpegDimensions(filePath) {
+    const buffer = fs.readFileSync(filePath);
+    if (buffer[0] !== 0xff || buffer[1] !== 0xd8) return null;
+
+    let offset = 2;
+    while (offset < buffer.length) {
+        if (buffer[offset] !== 0xff) {
+            offset += 1;
+            continue;
+        }
+
+        const marker = buffer[offset + 1];
+        const length = buffer.readUInt16BE(offset + 2);
+        if (marker >= 0xc0 && marker <= 0xc3) {
+            return {
+                width: buffer.readUInt16BE(offset + 7),
+                height: buffer.readUInt16BE(offset + 5),
+            };
+        }
+        offset += 2 + length;
+    }
+
+    return null;
+}
+
+export function renderOgCardHtml({ locale, category, title, description, tagline }) {
     return `<!doctype html>
 <html lang="${escapeHtml(locale)}">
   <head>
@@ -219,7 +354,7 @@ export function renderToolOgCardHtml({ locale, category, title, description }) {
         <h1>${escapeHtml(title)}</h1>
         <p>${escapeHtml(description)}</p>
         <div class="footer">
-          <div class="tagline">Privacy-first, local-first developer tools</div>
+          <div class="tagline">${escapeHtml(tagline)}</div>
           <div class="pill">${escapeHtml(locale)}</div>
         </div>
       </div>
@@ -228,8 +363,17 @@ export function renderToolOgCardHtml({ locale, category, title, description }) {
 </html>`;
 }
 
+export function renderToolOgCardHtml(card) {
+    return renderOgCardHtml(card);
+}
+
+export function renderDefaultOgCardHtml(card) {
+    return renderOgCardHtml(card);
+}
+
 export function ensureOgDirectories() {
+    fs.mkdirSync(DEFAULT_OUTPUT_ROOT, { recursive: true });
     for (const locale of OG_IMAGE_LOCALES) {
-        fs.mkdirSync(path.join(OUTPUT_ROOT, locale), { recursive: true });
+        fs.mkdirSync(path.join(TOOL_OUTPUT_ROOT, locale), { recursive: true });
     }
 }
diff --git a/src/app/[lang]/layout.tsx b/src/app/[lang]/layout.tsx
index 52ee577f..fc7b6616 100644
--- a/src/app/[lang]/layout.tsx
+++ b/src/app/[lang]/layout.tsx
@@ -6,8 +6,8 @@ import { ServerFooter } from "@/components/layout/server-footer";
 import { ServerNavbar } from "@/components/layout/server-navbar";
 import { LangProvider } from "@/core/i18n/lang-provider";
 import { SiteJsonLd } from "@/core/seo/components/site-json-ld";
-import { buildSiteKeywords, getOgLocale } from "@/core/seo/seo";
-import { SITE_URL, buildCanonicalUrl, buildLocalizedAlternates } from "@/core/seo/urls";
+import { buildDefaultOgImageUrl, buildSiteKeywords, getOgLocale } from "@/core/seo/seo";
+import { buildCanonicalUrl, buildLocalizedAlternates } from "@/core/seo/urls";
 import { getEnglishToolSearchAliases, getTranslation } from "@/core/i18n/translations/catalog";
 import { ToolPrivacyFooterSlot } from "@/features/tool-shell/tool-privacy-footer-slot";
 
@@ -27,6 +27,7 @@ export async function generateMetadata({ params }: { params: Promise<{ lang: str
     const t = getTranslation(locale);
 
     const canonicalUrl = buildCanonicalUrl(locale);
+    const ogImage = buildDefaultOgImageUrl(locale);
 
     return {
         title: { default: t.site.title, template: `%s | byteflow.tools` },
@@ -39,13 +40,13 @@ export async function generateMetadata({ params }: { params: Promise<{ lang: str
             siteName: "byteflow.tools",
             locale: getOgLocale(locale),
             type: "website",
-            images: [`${SITE_URL}/icon-512.png`],
+            images: [ogImage],
         },
         twitter: {
             card: "summary_large_image",
             title: t.site.title,
             description: t.site.description,
-            images: [`${SITE_URL}/icon-512.png`],
+            images: [ogImage],
         },
         alternates: {
             canonical: canonicalUrl,
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index a3cc9988..dfb5e6b3 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -3,7 +3,9 @@ import Script from "next/script";
 import "@/app/globals.css";
 import { DeferredToaster } from "@/components/ui/deferred-toaster";
 import { PWA_THEME_COLOR } from "@/core/pwa/constants";
-import { buildSiteKeywords } from "@/core/seo/seo";
+import { buildDefaultOgImageUrl, buildSiteKeywords } from "@/core/seo/seo";
+
+const ROOT_OG_IMAGE = buildDefaultOgImageUrl("en");
 
 export const metadata: Metadata = {
   metadataBase: new URL("https://byteflow.tools"),
@@ -16,13 +18,13 @@ export const metadata: Metadata = {
     url: "https://byteflow.tools",
     siteName: "byteflow.tools",
     type: "website",
-    images: ["https://byteflow.tools/icon-512.png"],
+    images: [ROOT_OG_IMAGE],
   },
   twitter: {
     card: "summary_large_image",
     title: "byteflow.tools | Privacy-first Developer Tools",
     description: "A growing collection of privacy-first, client-side developer utilities.",
-    images: ["https://byteflow.tools/icon-512.png"],
+    images: [ROOT_OG_IMAGE],
   },
 };
 
diff --git a/src/core/seo/seo.ts b/src/core/seo/seo.ts
index 2e7c9929..0b9019ac 100644
--- a/src/core/seo/seo.ts
+++ b/src/core/seo/seo.ts
@@ -10,7 +10,7 @@ import { getRouteIntentCopy as getLocalizedRouteIntentCopy, type RouteIntentType
 
 const SITE_NAME = "byteflow.tools";
 const SITE_TITLE_SUFFIX = ` | ${SITE_NAME}`;
-const DEFAULT_OG_IMAGE = `${SITE_URL}/icon-512.png`;
+const DEFAULT_OG_IMAGE = `${SITE_URL}/og/default/en.jpg`;
 const CONTENT_INTRO_EXCLUDE_SLUGS = new Set(["about", "pricing", "contact", "privacy", "trust-center", "terms"]);
 const OPEN_GRAPH_LOCALES: Record<Locale, string> = {
     en: "en_US",
@@ -252,6 +252,10 @@ export function buildToolOgImageUrl(lang: Locale, slug: string) {
     return `${SITE_URL}/og/tools/${lang}/${slug}.jpg`;
 }
 
+export function buildDefaultOgImageUrl(lang: Locale) {
+    return `${SITE_URL}/og/default/${lang}.jpg`;
+}
+
 export function applySeoSnippetAngle({
     lang,
     routeType,
@@ -380,6 +384,7 @@ export function buildHubMetadata({
 }): Metadata {
     const boosted = applySeoSnippetAngle({ lang, routeType: "hub", title, description });
     const canonicalUrl = buildCanonicalUrl(lang, slug);
+    const ogImage = buildDefaultOgImageUrl(lang);
 
     return {
         title: buildPageTitle(boosted.title),
@@ -400,13 +405,13 @@ export function buildHubMetadata({
             siteName: SITE_NAME,
             locale: getOgLocale(lang),
             type: "website",
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         },
         twitter: {
             card: "summary_large_image",
             title: withSiteName(boosted.title),
             description: boosted.description,
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         },
     };
 }
@@ -435,6 +440,7 @@ export function buildContentMetadata({
         description: localized.description,
     });
     const canonicalUrl = buildCanonicalUrl(lang, slug);
+    const ogImage = buildDefaultOgImageUrl(lang);
 
     return {
         title: buildPageTitle(boosted.title),
@@ -455,13 +461,13 @@ export function buildContentMetadata({
             siteName: SITE_NAME,
             locale: getOgLocale(lang),
             type: "article",
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         },
         twitter: {
             card: "summary_large_image",
             title: withSiteName(boosted.title),
             description: boosted.description,
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         },
     };
 }
@@ -481,6 +487,7 @@ export function buildStaticPageMetadata({
 }): Metadata {
     const canonicalUrl = buildCanonicalUrl(lang, slug);
     const languages = buildLocalizedAlternates({ slug });
+    const ogImage = buildDefaultOgImageUrl(lang);
 
     return {
         title: buildPageTitle(title),
@@ -507,13 +514,13 @@ export function buildStaticPageMetadata({
             siteName: SITE_NAME,
             locale: getOgLocale(lang),
             type: "website",
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         },
         twitter: {
             card: "summary_large_image",
             title: withSiteName(title),
             description,
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         },
     };
 }
diff --git a/tests/guards/og-tool-images.test.ts b/tests/guards/og-tool-images.test.ts
new file mode 100644
index 00000000..43562c8e
--- /dev/null
+++ b/tests/guards/og-tool-images.test.ts
@@ -0,0 +1,63 @@
+import fs from "node:fs"
+import path from "node:path"
+import { execFileSync } from "node:child_process"
+import { describe, expect, it } from "vitest"
+import { LOCALES } from "@/core/i18n/i18n"
+
+const PROJECT_ROOT = process.cwd()
+
+function readJpegDimensions(filePath: string) {
+    const buffer = fs.readFileSync(filePath)
+    if (buffer[0] !== 0xff || buffer[1] !== 0xd8) {
+        throw new Error(`${filePath} is not a JPEG`)
+    }
+
+    let offset = 2
+    while (offset < buffer.length) {
+        if (buffer[offset] !== 0xff) {
+            offset += 1
+            continue
+        }
+
+        const marker = buffer[offset + 1]
+        const length = buffer.readUInt16BE(offset + 2)
+        if (marker >= 0xc0 && marker <= 0xc3) {
+            return {
+                width: buffer.readUInt16BE(offset + 7),
+                height: buffer.readUInt16BE(offset + 5),
+            }
+        }
+        offset += 2 + length
+    }
+
+    throw new Error(`Could not read JPEG dimensions for ${filePath}`)
+}
+
+describe("BF-030 OG image coverage", () => {
+    it("keeps localized default share images at social-card dimensions", () => {
+        for (const locale of LOCALES) {
+            const imagePath = path.join(PROJECT_ROOT, "public", "og", "default", `${locale}.jpg`)
+            expect(fs.existsSync(imagePath), imagePath).toBe(true)
+            expect(readJpegDimensions(imagePath)).toEqual({ width: 1200, height: 630 })
+            expect(fs.statSync(imagePath).size, imagePath).toBeLessThanOrEqual(250_000)
+        }
+    })
+
+    it("keeps representative localized tool share images at social-card dimensions", () => {
+        for (const locale of LOCALES) {
+            const imagePath = path.join(PROJECT_ROOT, "public", "og", "tools", locale, "json-formatter.jpg")
+            expect(fs.existsSync(imagePath), imagePath).toBe(true)
+            expect(readJpegDimensions(imagePath)).toEqual({ width: 1200, height: 630 })
+        }
+    })
+
+    it("passes the OG image gate", () => {
+        const output = execFileSync(process.execPath, [path.join(PROJECT_ROOT, "scripts/gates/check-og-tool-images.js")], {
+            cwd: PROJECT_ROOT,
+            encoding: "utf8",
+        })
+
+        expect(output).toContain("[check:og-tool-images] OK")
+        expect(output).not.toContain("stale")
+    }, 15_000)
+})
diff --git a/tests/guards/seo-metadata-keywords.test.ts b/tests/guards/seo-metadata-keywords.test.ts
index 8ea3b504..38e8f11a 100644
--- a/tests/guards/seo-metadata-keywords.test.ts
+++ b/tests/guards/seo-metadata-keywords.test.ts
@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest"
 import { getLocalizedMetaCopy } from "@/core/seo/localized-meta-copy"
-import { buildContentMetadata, buildSiteKeywords, buildToolMetadata, buildToolOgImageUrl } from "@/core/seo/seo"
+import { buildContentMetadata, buildDefaultOgImageUrl, buildSiteKeywords, buildToolMetadata, buildToolOgImageUrl } from "@/core/seo/seo"
 import { getTranslation } from "@/core/i18n/translations/catalog"
 
 const ZH_FREE_ONLINE_TOOL = "\u514d\u8d39\u5728\u7ebf\u5de5\u5177"
@@ -55,4 +55,17 @@ describe("seo metadata keywords", () => {
         expect(ogImages).toEqual(["https://byteflow.tools/og/tools/zh-CN/json-formatter.jpg"])
         expect(twitterImages).toEqual(["https://byteflow.tools/og/tools/zh-CN/json-formatter.jpg"])
     })
+
+    it("uses locale-aware default OG images for content pages", () => {
+        const metadata = buildContentMetadata({
+            lang: "fr",
+            slug: "json-vs-json5-differences",
+            title: "JSON vs JSON5: What Changes and When to Use Each",
+            description: "Compare JSON and JSON5 syntax, parser support, and migration gotchas.",
+        })
+
+        expect(buildDefaultOgImageUrl("fr")).toBe("https://byteflow.tools/og/default/fr.jpg")
+        expect(metadata.openGraph?.images).toEqual(["https://byteflow.tools/og/default/fr.jpg"])
+        expect(metadata.twitter?.images).toEqual(["https://byteflow.tools/og/default/fr.jpg"])
+    })
 })
diff --git a/tests/guards/static-page-metadata.test.ts b/tests/guards/static-page-metadata.test.ts
index 83fcd9d6..9ac757bb 100644
--- a/tests/guards/static-page-metadata.test.ts
+++ b/tests/guards/static-page-metadata.test.ts
@@ -4,7 +4,7 @@ import { generateMetadata as generateAboutMetadata } from "@/app/[lang]/about/la
 import { generateMetadata as generateContactMetadata } from "@/app/[lang]/contact/layout"
 import { generateMetadata as generateInstallAppMetadata } from "@/app/[lang]/install-app/layout"
 import { generateMetadata as generateTrustCenterMetadata } from "@/app/[lang]/trust-center/layout"
-import { DEFAULT_OG_IMAGE } from "@/core/seo/seo"
+import { buildDefaultOgImageUrl } from "@/core/seo/seo"
 import { getTranslation } from "@/core/i18n/translations/catalog"
 
 function getTitleText(title: Metadata["title"]) {
@@ -28,18 +28,19 @@ describe("static page social metadata", () => {
         const title = metadata.title
         const description = metadata.description as string
         const keywords = metadata.keywords as string[]
+        const ogImage = buildDefaultOgImageUrl("en")
 
         expect(metadata.openGraph).toMatchObject({
             title: getExpectedSocialTitle(title),
             description,
             url: "https://byteflow.tools/en/contact",
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         })
         expect(metadata.twitter).toMatchObject({
             card: "summary_large_image",
             title: getExpectedSocialTitle(title),
             description,
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         })
         expect(keywords).toContain("Contact")
         expect(keywords).not.toContain("byteflow.tools | Privacy-first Developer Tools")
@@ -48,6 +49,7 @@ describe("static page social metadata", () => {
     it("keeps noindex static pages on page-specific social metadata", async () => {
         const metadata = await generateAboutMetadata({ params: Promise.resolve({ lang: "de" }) })
         const description = metadata.description as string
+        const ogImage = buildDefaultOgImageUrl("de")
 
         expect(metadata.title).toEqual({
             absolute: getTranslation("de").pages.about_title,
@@ -56,13 +58,13 @@ describe("static page social metadata", () => {
             title: getExpectedSocialTitle(metadata.title),
             description,
             url: "https://byteflow.tools/de/about",
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         })
         expect(metadata.twitter).toMatchObject({
             card: "summary_large_image",
             title: getExpectedSocialTitle(metadata.title),
             description,
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         })
     })
 
@@ -70,18 +72,19 @@ describe("static page social metadata", () => {
         const metadata = await generateInstallAppMetadata({ params: Promise.resolve({ lang: "fr" }) })
         const title = metadata.title
         const description = metadata.description as string
+        const ogImage = buildDefaultOgImageUrl("fr")
 
         expect(metadata.openGraph).toMatchObject({
             title: getExpectedSocialTitle(title),
             description,
             url: "https://byteflow.tools/fr/install-app",
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         })
         expect(metadata.twitter).toMatchObject({
             card: "summary_large_image",
             title: getExpectedSocialTitle(title),
             description,
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         })
     })
 
@@ -89,19 +92,20 @@ describe("static page social metadata", () => {
         const metadata = await generateTrustCenterMetadata({ params: Promise.resolve({ lang: "zh-CN" }) })
         const title = metadata.title
         const description = metadata.description as string
+        const ogImage = buildDefaultOgImageUrl("zh-CN")
 
         expect(getTitleText(title)).toBe(getTranslation("zh-CN").pages.trust_center_title)
         expect(metadata.openGraph).toMatchObject({
             title: getExpectedSocialTitle(title),
             description,
             url: "https://byteflow.tools/zh-CN/trust-center",
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         })
         expect(metadata.twitter).toMatchObject({
             card: "summary_large_image",
             title: getExpectedSocialTitle(title),
             description,
-            images: [DEFAULT_OG_IMAGE],
+            images: [ogImage],
         })
     })
 })