diff --git a/app.js b/app.js
index b6217eb..503f5a9 100644
--- a/app.js
+++ b/app.js
@@ -1843,7 +1843,7 @@ async function openPdfViewer(blob, filename, blobUrl) {
             <button class="icon-btn" id="pdf-next" title="Seite vor →">›</button>
             <div class="fs-title">${escapeHtml(filename || '')}</div>
             <button class="icon-btn" id="pdf-close">✕</button>
-            <a class="icon-btn" id="pdf-download" title="Download" download="${escapeHtml(filename || 'download')}" href="${blobUrl}">⬇</a>
+            <button class="icon-btn" id="pdf-download" title="Download">⬇</button>
         </div>
         <div class="pdf-body" id="pdf-body">
             <canvas id="pdf-canvas"></canvas>
@@ -1874,6 +1874,12 @@ async function openPdfViewer(blob, filename, blobUrl) {
         await renderPage(1);
         modal.querySelector('#pdf-prev').onclick = () => renderPage(currentPage - 1);
         modal.querySelector('#pdf-next').onclick = () => renderPage(currentPage + 1);
+        modal.querySelector('#pdf-download').onclick = () => {
+            const a = document.createElement('a');
+            a.href = blobUrl;
+            a.download = filename || 'download.pdf';
+            a.click();
+        };
         modal.querySelector('#pdf-prev').disabled = false;
         modal.querySelector('#pdf-next').disabled = pdf.numPages === 1;
     } catch (err) {