diff --git a/src/routes/convert.ts b/src/routes/convert.ts
index 6266f24..4ee2292 100644
--- a/src/routes/convert.ts
+++ b/src/routes/convert.ts
@@ -8,9 +8,15 @@ import net from "node:net";
 function isPrivateIP(ip: string): boolean {
   // IPv6 loopback/unspecified
   if (ip === "::1" || ip === "::") return true;
+  
+  // IPv6 link-local (fe80::/10)
+  if (ip.toLowerCase().startsWith("fe8") || ip.toLowerCase().startsWith("fe9") ||
+      ip.toLowerCase().startsWith("fea") || ip.toLowerCase().startsWith("feb")) return true;
+  
   // IPv4-mapped IPv6
   if (ip.startsWith("::ffff:")) ip = ip.slice(7);
   if (!net.isIPv4(ip)) return false;
+  
   const parts = ip.split(".").map(Number);
   if (parts[0] === 0) return true;                           // 0.0.0.0/8
   if (parts[0] === 10) return true;                           // 10.0.0.0/8
@@ -160,7 +166,7 @@ convertRouter.post("/url", async (req: Request & { acquirePdfSlot?: () => Promis
     try {
       const { address } = await dns.lookup(parsed.hostname);
       if (isPrivateIP(address)) {
-        res.status(400).json({ error: "URL resolves to private/reserved IP" });
+        res.status(400).json({ error: "URL resolves to a private/internal IP address" });
         return;
       }
     } catch {