diff --git a/web/chat.html b/web/chat.html
index bf75e0a..b79721d 100644
--- a/web/chat.html
+++ b/web/chat.html
@@ -139,7 +139,7 @@
   }
   .share-box .url-side { min-width: 0; }
   .share-box .qr-canvas {
-    width: 180px; height: 180px;
+    width: 320px; height: 320px;
     border: 1px solid #ccc; background: #fff;
     display: flex; align-items: center; justify-content: center;
     font-size: 0.65rem; color: #999;
@@ -550,7 +550,7 @@ function renderQR(containerId, text) {
   if (!el) return;
   el.innerHTML = '';
   try {
-    new QRCode(el, { text, width: 180, height: 180, correctLevel: QRCode.CorrectLevel.L });
+    new QRCode(el, { text, width: 320, height: 320, correctLevel: QRCode.CorrectLevel.L });
   } catch (e) {
     el.textContent = 'QR too long (' + text.length + ' chars). use the copy link button.';
   }