diff --git a/packages/app/src/composables/contentExtraction.ts b/packages/app/src/composables/contentExtraction.ts
index 4c1761d1..5a93c8c5 100644
--- a/packages/app/src/composables/contentExtraction.ts
+++ b/packages/app/src/composables/contentExtraction.ts
@@ -27,8 +27,10 @@ function extractUrlFromText(text: string): string | undefined {
   const mdLink = /\[([^\]]*)\]\((https?:\/\/[^)]+)\)/.exec(text)
   const raw = mdLink ? mdLink[2] : (/(https?:\/\/[^\s)\]"'<>]+)/.exec(text)?.[1])
   if (!raw?.trim()) return undefined
+  const trimmed = raw.trim()
+  if (trimmed.length > 2048) return undefined
   try {
-    const u = new URL(raw.trim())
+    const u = new URL(trimmed)
     if (!/^https?:$/i.test(u.protocol)) return undefined
     return u.href
   } catch {