diff --git a/src/__tests__/repository-url.test.ts b/src/__tests__/repository-url.test.ts
new file mode 100644
index 0000000..5a24277
--- /dev/null
+++ b/src/__tests__/repository-url.test.ts
@@ -0,0 +1,30 @@
+import { describe, expect, it } from "vitest";
+import { parseRepositoryReference } from "../../website/src/lib/repository-url.js";
+
+describe("parseRepositoryReference", () => {
+  it.each([
+    [
+      "getsentry/coverage-action",
+      { owner: "getsentry", repo: "coverage-action" },
+    ],
+    [
+      "github.com/getsentry/coverage-action",
+      { owner: "getsentry", repo: "coverage-action" },
+    ],
+    [
+      "https://github.com/getsentry/coverage-action.git",
+      { owner: "getsentry", repo: "coverage-action" },
+    ],
+  ])("parses supported repository references", (value, expected) => {
+    expect(parseRepositoryReference(value)).toEqual(expected);
+  });
+
+  it.each([
+    "github.com/getsentry",
+    "https://example.com/github.com/getsentry/coverage-action",
+    "https://github.com.example.com/getsentry/coverage-action",
+    "https://github.com@evil.example/getsentry/coverage-action",
+  ])("rejects URLs that do not target github.com", (value) => {
+    expect(parseRepositoryReference(value)).toBeNull();
+  });
+});
diff --git a/website/src/lib/repository-url.ts b/website/src/lib/repository-url.ts
new file mode 100644
index 0000000..7a75486
--- /dev/null
+++ b/website/src/lib/repository-url.ts
@@ -0,0 +1,42 @@
+export interface RepositoryReference {
+  owner: string;
+  repo: string;
+}
+
+/**
+ * Parse a repository shorthand or a URL hosted on github.com.
+ */
+export function parseRepositoryReference(
+  value: string,
+): RepositoryReference | null {
+  const input = value.trim();
+  if (!input) {
+    return null;
+  }
+
+  const urlInput = input.startsWith("github.com/") ? `https://${input}` : input;
+
+  try {
+    const url = new URL(urlInput);
+    if (url.hostname !== "github.com") {
+      return null;
+    }
+
+    const [owner, repo] = url.pathname.split("/").filter(Boolean);
+    if (!owner || !repo) {
+      return null;
+    }
+
+    return { owner, repo: repo.replace(/\.git$/, "") };
+  } catch {
+    const shorthand = input.match(/^([^/\s]+)\/([^/\s]+)$/);
+    if (!shorthand) {
+      return null;
+    }
+
+    return {
+      owner: shorthand[1],
+      repo: shorthand[2].replace(/\.git$/, ""),
+    };
+  }
+}
diff --git a/website/src/pages/HomePage.tsx b/website/src/pages/HomePage.tsx
index 0ea2c71..afb20ba 100644
--- a/website/src/pages/HomePage.tsx
+++ b/website/src/pages/HomePage.tsx
@@ -10,6 +10,7 @@ import {
   CardTitle,
 } from "@/components/ui/card";
 import { Input } from "@/components/ui/input";
+import { parseRepositoryReference } from "@/lib/repository-url";
 
 export default function HomePage() {
   const navigate = useNavigate();
@@ -18,23 +19,9 @@ export default function HomePage() {
   const handleSubmit = (e: React.FormEvent) => {
     e.preventDefault();
 
-    // Parse repo URL or owner/repo format
-    let owner = "";
-    let repo = "";
-
-    // Try to extract from various formats
-    if (repoUrl.includes("github.com/")) {
-      const match = repoUrl.match(/github\.com\/([^/]+)\/([^/\s]+)/);
-      if (match) {
-        owner = match[1];
-        repo = match[2].replace(/\.git$/, "");
-      }
-    } else if (repoUrl.includes("/")) {
-      [owner, repo] = repoUrl.split("/").map((s) => s.trim());
-    }
-
-    if (owner && repo) {
-      navigate(`/${owner}/${repo}`);
+    const repository = parseRepositoryReference(repoUrl);
+    if (repository) {
+      navigate(`/${repository.owner}/${repository.repo}`);
     }
   };