diff --git a/static/js/app.js b/static/js/app.js
index 59a2f4d..799e3c0 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -2937,15 +2937,20 @@ async function renderPdf(arrayBuffer, contentEl, scaleOverride) {
     const inner = document.createElement('div');
     inner.className = 'pdf-page-inner';
 
+    const dpr = window.devicePixelRatio || 1;
     const canvas = document.createElement('canvas');
     canvas.className = 'pdf-page';
-    canvas.width = viewport.width;
-    canvas.height = viewport.height;
+    canvas.width = Math.round(viewport.width * dpr);
+    canvas.height = Math.round(viewport.height * dpr);
+    canvas.style.width = viewport.width + 'px';
+    canvas.style.height = viewport.height + 'px';
     inner.appendChild(canvas);
     wrapper.appendChild(inner);
     pdfVp.appendChild(wrapper);
 
-    await page.render({canvasContext: canvas.getContext('2d'), viewport}).promise;
+    const ctx = canvas.getContext('2d');
+    ctx.scale(dpr, dpr);
+    await page.render({canvasContext: ctx, viewport}).promise;
 
     // Text layer disabled — re-enable once overlay rendering is resolved
   }