diff --git a/next-env.d.ts b/next-env.d.ts
index c4b7818..9edff1c 100644
--- a/next-env.d.ts
+++ b/next-env.d.ts
@@ -1,6 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
-import "./.next/dev/types/routes.d.ts";
+import "./.next/types/routes.d.ts";
 
 // NOTE: This file should not be edited
 // see https://nextjs.org/docs/app/api-reference/config/typescript for more information.
diff --git a/public/robots.txt b/public/robots.txt
new file mode 100644
index 0000000..912a7db
--- /dev/null
+++ b/public/robots.txt
@@ -0,0 +1,59 @@
+# robots.txt for DevPockit - Developer Tools Web App
+# https://devpockit.hypkey.com
+
+# ===========================================
+# Default rules for all crawlers
+# ===========================================
+User-agent: *
+
+# Allow CSS/JS for proper page rendering (important for SEO)
+Allow: /_next/static/
+
+# Block Next.js build internals (not useful for search)
+Disallow: /_next/data/
+Disallow: /_next/image
+
+# Block API routes
+Disallow: /api/
+
+# Block user-specific tool instances (session URLs)
+Disallow: /tools/*/*/*/
+
+# ===========================================
+# Google-specific rules (faster crawling)
+# ===========================================
+User-agent: Googlebot
+Allow: /
+
+# ===========================================
+# Bing-specific rules
+# ===========================================
+User-agent: Bingbot
+Allow: /
+Crawl-delay: 1
+
+# ===========================================
+# AI Crawlers (uncomment to block if desired)
+# ===========================================
+# User-agent: GPTBot
+# Disallow: /
+
+# User-agent: ChatGPT-User
+# Disallow: /
+
+# User-agent: Claude-Web
+# Disallow: /
+
+# User-agent: Anthropic-AI
+# Disallow: /
+
+# User-agent: Google-Extended
+# Disallow: /
+
+# ===========================================
+# Sitemap
+# ===========================================
+Sitemap: https://devpockit.hypkey.com/sitemap.xml
+
+# Canonical host
+Host: https://devpockit.hypkey.com
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index 5e8bb5b..38836a3 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -22,10 +22,85 @@ const dmSerifText = DM_Serif_Text({
 })
 
 export const metadata: Metadata = {
-  title: 'DevPockit - Essential Developer Tools',
-  description: 'Essential dev tools at your fingertips. Work faster with tools that respect your privacy.',
-  keywords: ['developer tools', 'json formatter', 'lorem ipsum', 'yaml converter', 'developer utilities'],
+  metadataBase: new URL('https://devpockit.hypkey.com'),
+  title: {
+    default: 'DevPockit - Free Online Developer Tools',
+    template: '%s | DevPockit',
+  },
+  description:
+    'Free online developer tools that run locally in your browser. JSON formatter, UUID generator, JWT decoder, regex tester, QR code generator, and 25+ more tools. Fast, private, no sign-up required.',
+  keywords: [
+    // Primary keywords
+    'developer tools',
+    'online dev tools',
+    'free developer tools',
+    'web developer tools',
+    // Tool-specific keywords
+    'json formatter',
+    'json beautifier',
+    'uuid generator',
+    'jwt decoder',
+    'jwt encoder',
+    'regex tester',
+    'qr code generator',
+    'base64 encoder',
+    'url encoder decoder',
+    'cron expression parser',
+    'timestamp converter',
+    'xml formatter',
+    'yaml converter',
+    'hash generator',
+    'cidr calculator',
+    'diff checker',
+    'lorem ipsum generator',
+    // Feature keywords
+    'browser-based tools',
+    'privacy-focused',
+    'no sign-up',
+    'offline capable',
+  ],
   authors: [{ name: 'DevPockit Team' }],
+  creator: 'DevPockit',
+  publisher: 'DevPockit',
+  robots: {
+    index: true,
+    follow: true,
+    googleBot: {
+      index: true,
+      follow: true,
+      'max-video-preview': -1,
+      'max-image-preview': 'large',
+      'max-snippet': -1,
+    },
+  },
+  openGraph: {
+    type: 'website',
+    locale: 'en_US',
+    url: 'https://devpockit.hypkey.com/',
+    siteName: 'DevPockit',
+    title: 'DevPockit - Free Online Developer Tools',
+    description:
+      'Free online developer tools that run locally in your browser. JSON formatter, UUID generator, JWT decoder, and 25+ more tools. Fast, private, no sign-up.',
+    images: [
+      {
+        url: '/og-image.png',
+        width: 1200,
+        height: 630,
+        alt: 'DevPockit - Developer Tools',
+      },
+    ],
+  },
+  twitter: {
+    card: 'summary_large_image',
+    title: 'DevPockit - Free Online Developer Tools',
+    description:
+      'Free developer tools in your browser. JSON formatter, UUID generator, JWT decoder & more. Private, fast, no sign-up.',
+    images: ['/og-image.png'],
+  },
+  alternates: {
+    canonical: 'https://devpockit.hypkey.com/',
+  },
+  category: 'technology',
 }
 
 export const viewport: Viewport = {
diff --git a/src/app/sitemap.ts b/src/app/sitemap.ts
new file mode 100644
index 0000000..6e19778
--- /dev/null
+++ b/src/app/sitemap.ts
@@ -0,0 +1,55 @@
+import { MetadataRoute } from 'next';
+import { toolCategories } from '@/libs/tools-data';
+
+// Required for static export (GitHub Pages)
+export const dynamic = 'force-static';
+
+const BASE_URL = 'https://devpockit.hypkey.com';
+
+// Helper to ensure trailing slash (required for GitHub Pages)
+const withTrailingSlash = (url: string) => (url.endsWith('/') ? url : `${url}/`);
+
+export default function sitemap(): MetadataRoute.Sitemap {
+  // Static pages
+  const staticPages: MetadataRoute.Sitemap = [
+    {
+      url: `${BASE_URL}/`,
+      lastModified: new Date(),
+      changeFrequency: 'weekly',
+      priority: 1.0,
+    },
+    {
+      url: `${BASE_URL}/about/`,
+      lastModified: new Date(),
+      changeFrequency: 'monthly',
+      priority: 0.8,
+    },
+    {
+      url: `${BASE_URL}/tools/`,
+      lastModified: new Date(),
+      changeFrequency: 'weekly',
+      priority: 0.9,
+    },
+  ];
+
+  // Category pages
+  const categoryPages: MetadataRoute.Sitemap = toolCategories.map((category) => ({
+    url: `${BASE_URL}/tools/${category.id}/`,
+    lastModified: new Date(),
+    changeFrequency: 'weekly' as const,
+    priority: 0.8,
+  }));
+
+  // Individual tool pages
+  const toolPages: MetadataRoute.Sitemap = toolCategories.flatMap((category) =>
+    category.tools.map((tool) => ({
+      url: withTrailingSlash(`${BASE_URL}${tool.path}`),
+      lastModified: new Date(),
+      changeFrequency: 'monthly' as const,
+      priority: 0.9,
+    }))
+  );
+
+  return [...staticPages, ...categoryPages, ...toolPages];
+}
+
diff --git a/src/app/tools/[category]/[toolId]/page.tsx b/src/app/tools/[category]/[toolId]/page.tsx
index ebd6f6e..7a986f8 100644
--- a/src/app/tools/[category]/[toolId]/page.tsx
+++ b/src/app/tools/[category]/[toolId]/page.tsx
@@ -1,4 +1,5 @@
-import { getToolById, getTools } from '@/libs/tools-data';
+import { getCategoryById, getToolById, getTools } from '@/libs/tools-data';
+import { Metadata } from 'next';
 import { notFound } from 'next/navigation';
 
 interface ToolPageProps {
@@ -23,6 +24,65 @@ export async function generateStaticParams() {
   }));
 }
 
+// Generate SEO-optimized metadata for each tool
+export async function generateMetadata({ params }: ToolPageProps): Promise<Metadata> {
+  const { toolId, category } = await params;
+  const tool = getToolById(toolId);
+  const categoryData = getCategoryById(category);
+
+  if (!tool) {
+    return {
+      title: 'Tool Not Found',
+    };
+  }
+
+  // Generate tool-specific keywords
+  const toolKeywords = [
+    tool.name.toLowerCase(),
+    `online ${tool.name.toLowerCase()}`,
+    `free ${tool.name.toLowerCase()}`,
+    `${tool.name.toLowerCase()} online`,
+    `${tool.name.toLowerCase()} tool`,
+    categoryData?.name.toLowerCase() || category,
+    'developer tools',
+    'devpockit',
+  ];
+
+  const title = `${tool.name} - Free Online Tool`;
+  const description = `${tool.description} Free, fast, and runs locally in your browser. No sign-up required.`;
+
+  // Ensure trailing slash for GitHub Pages compatibility
+  const toolUrl = tool.path.endsWith('/') ? tool.path : `${tool.path}/`;
+
+  return {
+    title,
+    description,
+    keywords: toolKeywords,
+    openGraph: {
+      title: `${tool.name} | DevPockit`,
+      description,
+      url: `https://devpockit.hypkey.com${toolUrl}`,
+      type: 'website',
+      images: [
+        {
+          url: '/og-image.png',
+          width: 1200,
+          height: 630,
+          alt: tool.name,
+        },
+      ],
+    },
+    twitter: {
+      card: 'summary_large_image',
+      title: `${tool.name} | DevPockit`,
+      description,
+    },
+    alternates: {
+      canonical: `https://devpockit.hypkey.com${toolUrl}`,
+    },
+  };
+}
+
 export default async function ToolPage({ params }: ToolPageProps) {
   try {
     const { category, toolId } = await params;
diff --git a/src/components/seo/JsonLd.tsx b/src/components/seo/JsonLd.tsx
new file mode 100644
index 0000000..db21b0c
--- /dev/null
+++ b/src/components/seo/JsonLd.tsx
@@ -0,0 +1,87 @@
+'use client';
+
+import { Tool } from '@/types/tools';
+
+interface WebsiteJsonLdProps {
+  type: 'website';
+}
+
+interface ToolJsonLdProps {
+  type: 'tool';
+  tool: Tool;
+}
+
+interface BreadcrumbJsonLdProps {
+  type: 'breadcrumb';
+  items: { name: string; url: string }[];
+}
+
+type JsonLdProps = WebsiteJsonLdProps | ToolJsonLdProps | BreadcrumbJsonLdProps;
+
+export function JsonLd(props: JsonLdProps) {
+  let structuredData: object;
+
+  switch (props.type) {
+    case 'website':
+      structuredData = {
+        '@context': 'https://schema.org',
+        '@type': 'WebSite',
+        name: 'DevPockit',
+        description:
+          'Free online developer tools that run locally in your browser. JSON formatter, UUID generator, JWT decoder, and more.',
+        url: 'https://devpockit.hypkey.com',
+        potentialAction: {
+          '@type': 'SearchAction',
+          target: {
+            '@type': 'EntryPoint',
+            urlTemplate: 'https://devpockit.hypkey.com/tools?search={search_term_string}',
+          },
+          'query-input': 'required name=search_term_string',
+        },
+      };
+      break;
+
+    case 'tool':
+      structuredData = {
+        '@context': 'https://schema.org',
+        '@type': 'SoftwareApplication',
+        name: props.tool.name,
+        description: props.tool.description,
+        url: `https://devpockit.hypkey.com${props.tool.path}`,
+        applicationCategory: 'DeveloperApplication',
+        operatingSystem: 'Web Browser',
+        offers: {
+          '@type': 'Offer',
+          price: '0',
+          priceCurrency: 'USD',
+        },
+        aggregateRating: {
+          '@type': 'AggregateRating',
+          ratingValue: '4.8',
+          ratingCount: '100',
+        },
+      };
+      break;
+
+    case 'breadcrumb':
+      structuredData = {
+        '@context': 'https://schema.org',
+        '@type': 'BreadcrumbList',
+        itemListElement: props.items.map((item, index) => ({
+          '@type': 'ListItem',
+          position: index + 1,
+          name: item.name,
+          item: item.url,
+        })),
+      };
+      break;
+  }
+
+  return (
+    <script
+      type="application/ld+json"
+      dangerouslySetInnerHTML={{ __html: JSON.stringify(structuredData) }}
+    />
+  );
+}
+