diff --git a/apps/website/app/(docs)/docs/(landing)/page.tsx b/apps/website/app/(docs)/docs/(landing)/page.tsx
index 979d0dcdb..ef5e5a10c 100644
--- a/apps/website/app/(docs)/docs/(landing)/page.tsx
+++ b/apps/website/app/(docs)/docs/(landing)/page.tsx
@@ -3,11 +3,13 @@ import { ArrowRight } from "lucide-react";
 import { Card, CardContent } from "@repo/ui/components/ui/card";
 import { PlatformBadge } from "~/components/PlatformBadge";
 import { Logo } from "~/components/Logo";
+import { getCanonicalMetadata, PUBLIC_STATIC_PATHS } from "~/seo";
 
 export const metadata: Metadata = {
   title: "Documentation",
   description:
     "Choose the Discourse Graphs documentation for Roam Research or Obsidian.",
+  ...getCanonicalMetadata(PUBLIC_STATIC_PATHS.docs),
 };
 
 const DOCS_DESTINATIONS = [
diff --git a/apps/website/app/(docs)/docs/obsidian/[[...mdxPath]]/page.tsx b/apps/website/app/(docs)/docs/obsidian/[[...mdxPath]]/page.tsx
index f4600feb1..5eade6750 100644
--- a/apps/website/app/(docs)/docs/obsidian/[[...mdxPath]]/page.tsx
+++ b/apps/website/app/(docs)/docs/obsidian/[[...mdxPath]]/page.tsx
@@ -2,6 +2,7 @@ import type { Metadata } from "next";
 import { notFound } from "next/navigation";
 import { generateStaticParamsFor, importPage } from "nextra/pages";
 import DocsPageTemplate from "../../_components/DocsPageTemplate";
+import { getCanonicalMetadata, getDocsPath } from "~/seo";
 
 type DocsPageProps = {
   params: Promise<{
@@ -52,16 +53,24 @@ const Page = async ({ params }: DocsPageProps): Promise<React.ReactElement> => {
 export const generateMetadata = async ({
   params,
 }: DocsPageProps): Promise<Metadata> => {
+  const { mdxPath } = await params;
+  const canonicalMetadata = getCanonicalMetadata(
+    getDocsPath({ mdxPath, platform: "obsidian" }),
+  );
+
   try {
-    const { mdxPath } = await params;
     const { metadata } = await loadPage(mdxPath);
 
-    return metadata;
+    return {
+      ...metadata,
+      ...canonicalMetadata,
+    };
   } catch (error) {
     console.error("Error generating Obsidian docs metadata:", error);
 
     return {
       title: "Obsidian docs",
+      ...canonicalMetadata,
     };
   }
 };
diff --git a/apps/website/app/(docs)/docs/roam/[[...mdxPath]]/page.tsx b/apps/website/app/(docs)/docs/roam/[[...mdxPath]]/page.tsx
index 42180f867..7b5748e48 100644
--- a/apps/website/app/(docs)/docs/roam/[[...mdxPath]]/page.tsx
+++ b/apps/website/app/(docs)/docs/roam/[[...mdxPath]]/page.tsx
@@ -2,6 +2,7 @@ import type { Metadata } from "next";
 import { notFound } from "next/navigation";
 import { generateStaticParamsFor, importPage } from "nextra/pages";
 import DocsPageTemplate from "../../_components/DocsPageTemplate";
+import { getCanonicalMetadata, getDocsPath } from "~/seo";
 
 type DocsPageProps = {
   params: Promise<{
@@ -52,16 +53,24 @@ const Page = async ({ params }: DocsPageProps): Promise<React.ReactElement> => {
 export const generateMetadata = async ({
   params,
 }: DocsPageProps): Promise<Metadata> => {
+  const { mdxPath } = await params;
+  const canonicalMetadata = getCanonicalMetadata(
+    getDocsPath({ mdxPath, platform: "roam" }),
+  );
+
   try {
-    const { mdxPath } = await params;
     const { metadata } = await loadPage(mdxPath);
 
-    return metadata;
+    return {
+      ...metadata,
+      ...canonicalMetadata,
+    };
   } catch (error) {
     console.error("Error generating Roam docs metadata:", error);
 
     return {
       title: "Roam docs",
+      ...canonicalMetadata,
     };
   }
 };
diff --git a/apps/website/app/(extract)/layout.tsx b/apps/website/app/(extract)/layout.tsx
index 5bf62774b..411179376 100644
--- a/apps/website/app/(extract)/layout.tsx
+++ b/apps/website/app/(extract)/layout.tsx
@@ -3,11 +3,13 @@ import "~/globals.css";
 import Image from "next/image";
 import Link from "next/link";
 import { Inter } from "next/font/google";
+import { getCanonicalMetadata, PUBLIC_STATIC_PATHS } from "~/seo";
 
 export const metadata: Metadata = {
   title: "Extract Nodes | Discourse Graphs",
   description:
     "Extract structured discourse graph nodes from academic papers using AI.",
+  ...getCanonicalMetadata(PUBLIC_STATIC_PATHS.extractNodes),
 };
 
 const inter = Inter({
diff --git a/apps/website/app/(home)/blog/[slug]/page.tsx b/apps/website/app/(home)/blog/[slug]/page.tsx
index e551dce44..46b0e48d0 100644
--- a/apps/website/app/(home)/blog/[slug]/page.tsx
+++ b/apps/website/app/(home)/blog/[slug]/page.tsx
@@ -3,6 +3,7 @@ import { notFound } from "next/navigation";
 import { importPage } from "nextra/pages";
 import type { BlogData } from "../blogSchema";
 import { getAllBlogs, getBlogBySlug } from "../readBlogs";
+import { getBlogPostPath, getCanonicalMetadata, getCanonicalUrl } from "~/seo";
 
 type Params = {
   params: Promise<{
@@ -39,6 +40,7 @@ const buildBlogPostMetadata = ({
     description: blog.description,
     metadata: pageMetadata,
   });
+  const canonicalPath = getBlogPostPath(blog.slug);
 
   return {
     ...pageMetadata,
@@ -48,7 +50,7 @@ const buildBlogPostMetadata = ({
     keywords: blog.tags.length ? blog.tags : pageMetadata.keywords,
     alternates: {
       ...pageMetadata.alternates,
-      canonical: `/blog/${blog.slug}`,
+      ...getCanonicalMetadata(canonicalPath).alternates,
     },
     openGraph: {
       ...pageMetadata.openGraph,
@@ -58,7 +60,7 @@ const buildBlogPostMetadata = ({
       publishedTime: blog.date,
       authors: [blog.author],
       tags: blog.tags.length ? blog.tags : undefined,
-      url: `/blog/${blog.slug}`,
+      url: getCanonicalUrl(canonicalPath),
     },
     twitter: {
       ...pageMetadata.twitter,
@@ -124,13 +126,16 @@ export const generateStaticParams = async (): Promise<
 export const generateMetadata = async ({
   params,
 }: Params): Promise<Metadata> => {
+  const { slug } = await params;
+  const canonicalMetadata = getCanonicalMetadata(getBlogPostPath(slug));
+
   try {
-    const { slug } = await params;
     const blog = await getBlogBySlug(slug);
 
     if (!blog) {
       return {
         title: "Blog Post",
+        ...canonicalMetadata,
       };
     }
 
@@ -144,6 +149,7 @@ export const generateMetadata = async ({
     console.error("Error generating metadata:", error);
     return {
       title: "Blog Post",
+      ...canonicalMetadata,
     };
   }
 };
diff --git a/apps/website/app/(home)/blog/page.tsx b/apps/website/app/(home)/blog/page.tsx
index 9e8952789..673975528 100644
--- a/apps/website/app/(home)/blog/page.tsx
+++ b/apps/website/app/(home)/blog/page.tsx
@@ -2,6 +2,7 @@ import type { Metadata } from "next";
 import Link from "next/link";
 import { importPage } from "nextra/pages";
 import { getAllBlogs } from "./readBlogs";
+import { getCanonicalMetadata, PUBLIC_STATIC_PATHS } from "~/seo";
 
 type ImportedPage = Awaited<ReturnType<typeof importPage>>;
 
@@ -70,12 +71,16 @@ export const generateMetadata = async (): Promise<Metadata> => {
   try {
     const { metadata } = await loadBlogIndex();
 
-    return metadata;
+    return {
+      ...metadata,
+      ...getCanonicalMetadata(PUBLIC_STATIC_PATHS.blog),
+    };
   } catch (error) {
     console.error("Error generating blog index metadata:", error);
 
     return {
       title: "All Updates",
+      ...getCanonicalMetadata(PUBLIC_STATIC_PATHS.blog),
     };
   }
 };
diff --git a/apps/website/app/(home)/page.tsx b/apps/website/app/(home)/page.tsx
index 90752b135..00b9f034a 100644
--- a/apps/website/app/(home)/page.tsx
+++ b/apps/website/app/(home)/page.tsx
@@ -1,3 +1,4 @@
+import type { Metadata } from "next";
 import type { ReactElement, ReactNode } from "react";
 import Image from "next/image";
 import Link from "next/link";
@@ -19,6 +20,11 @@ import { Logo } from "~/components/Logo";
 import { PlatformBadge } from "~/components/PlatformBadge";
 import { TeamPerson } from "~/components/TeamPerson";
 import { TEAM_MEMBERS } from "~/data/constants";
+import { getCanonicalMetadata, PUBLIC_STATIC_PATHS } from "~/seo";
+
+export const metadata: Metadata = getCanonicalMetadata(
+  PUBLIC_STATIC_PATHS.home,
+);
 
 const SLACK_URL =
   "https://join.slack.com/t/discoursegraphs/shared_invite/zt-37xklatti-cpEjgPQC0YyKYQWPNgAkEg";
diff --git a/apps/website/app/layout.tsx b/apps/website/app/layout.tsx
index bbee90cb4..bb267f720 100644
--- a/apps/website/app/layout.tsx
+++ b/apps/website/app/layout.tsx
@@ -1,7 +1,14 @@
+import type { Metadata } from "next";
+import { PRODUCTION_SITE_URL } from "./seo";
+
 type RootLayoutProps = {
   children: React.ReactNode;
 };
 
+export const metadata: Metadata = {
+  metadataBase: PRODUCTION_SITE_URL,
+};
+
 const RootLayout = ({ children }: RootLayoutProps): React.ReactElement => {
   return (
     <html lang="en" suppressHydrationWarning>
diff --git a/apps/website/app/seo.test.ts b/apps/website/app/seo.test.ts
new file mode 100644
index 000000000..bcb13b262
--- /dev/null
+++ b/apps/website/app/seo.test.ts
@@ -0,0 +1,50 @@
+import { describe, expect, it } from "vitest";
+import {
+  PRODUCTION_SITE_URL,
+  PUBLIC_STATIC_PATHS,
+  getBlogPostPath,
+  getCanonicalMetadata,
+  getCanonicalUrl,
+  getDocsPath,
+} from "./seo";
+
+describe("canonical metadata", () => {
+  it("uses the production website origin", () => {
+    expect(PRODUCTION_SITE_URL.href).toBe("https://discoursegraphs.com/");
+  });
+
+  it("keeps the public static route inventory canonical and absolute", () => {
+    expect(
+      Object.fromEntries(
+        Object.entries(PUBLIC_STATIC_PATHS).map(([route, pathname]) => [
+          route,
+          getCanonicalUrl(pathname).href,
+        ]),
+      ),
+    ).toEqual({
+      blog: "https://discoursegraphs.com/blog",
+      docs: "https://discoursegraphs.com/docs",
+      extractNodes: "https://discoursegraphs.com/extract-nodes",
+      home: "https://discoursegraphs.com/",
+    });
+  });
+
+  it("creates canonical metadata with an absolute URL", () => {
+    expect(getCanonicalMetadata(PUBLIC_STATIC_PATHS.docs)).toEqual({
+      alternates: {
+        canonical: new URL("https://discoursegraphs.com/docs"),
+      },
+    });
+  });
+
+  it("builds canonical blog and docs paths without duplicate variants", () => {
+    expect(getBlogPostPath("release notes")).toBe("/blog/release%20notes");
+    expect(getDocsPath({ platform: "roam" })).toBe("/docs/roam");
+    expect(
+      getDocsPath({
+        platform: "obsidian",
+        mdxPath: ["welcome", "getting started"],
+      }),
+    ).toBe("/docs/obsidian/welcome/getting%20started");
+  });
+});
diff --git a/apps/website/app/seo.ts b/apps/website/app/seo.ts
new file mode 100644
index 000000000..ee7bf4c07
--- /dev/null
+++ b/apps/website/app/seo.ts
@@ -0,0 +1,36 @@
+import type { Metadata } from "next";
+
+export const PRODUCTION_SITE_URL = new URL("https://discoursegraphs.com");
+
+export const PUBLIC_STATIC_PATHS = {
+  blog: "/blog",
+  docs: "/docs",
+  extractNodes: "/extract-nodes",
+  home: "/",
+} as const;
+
+export const getCanonicalUrl = (pathname: string): URL =>
+  new URL(pathname, PRODUCTION_SITE_URL);
+
+export const getCanonicalMetadata = (
+  pathname: string,
+): Pick<Metadata, "alternates"> => ({
+  alternates: {
+    canonical: getCanonicalUrl(pathname),
+  },
+});
+
+export const getBlogPostPath = (slug: string): string =>
+  `/blog/${encodeURIComponent(slug)}`;
+
+export const getDocsPath = ({
+  mdxPath,
+  platform,
+}: {
+  mdxPath?: string[];
+  platform: "obsidian" | "roam";
+}): string => {
+  const encodedPath = (mdxPath ?? []).map(encodeURIComponent).join("/");
+
+  return `/docs/${platform}${encodedPath ? `/${encodedPath}` : ""}`;
+};