diff --git a/static/css/app.css b/static/css/app.css
index 4625ee2..7429252 100644
--- a/static/css/app.css
+++ b/static/css/app.css
@@ -1554,6 +1554,7 @@ body.dnd-mode .timer-display {
 .reader-content {
   flex: 1;
   overflow-y: scroll;
+  overflow-x: auto;
   padding: 24px 16px;
   line-height: 1.8;
   font-family: Georgia, 'Times New Roman', serif;
diff --git a/static/js/app.js b/static/js/app.js
index b4474f5..dcdee81 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -2996,7 +2996,6 @@ async function renderPdf(arrayBuffer, contentEl, scaleOverride) {
   // Viewport wrapper: CSS zoom controls display scale without re-rendering
   const pdfVp = document.createElement('div');
   pdfVp.id = 'pdf-viewport';
-  if (scaleOverride == null) pdfVp.style.zoom = readerSettings.pdfZoom / 100;
   contentEl.appendChild(pdfVp);
 
   const containerWidth = readerSettings.pdfSpread
@@ -3010,8 +3009,9 @@ async function renderPdf(arrayBuffer, contentEl, scaleOverride) {
     const page = await pdf.getPage(pageNum);
     const naturalVp = page.getViewport({scale: 1});
     const pageWidth = readerSettings.pdfSpread ? (containerWidth - 8) / 2 : containerWidth;
+    // Zoom baked into canvas resolution — no CSS zoom, stays sharp at any DPR
     const scale = scaleOverride != null ? scaleOverride
-      : Math.max(0.5, pageWidth / naturalVp.width);
+      : Math.max(0.5, pageWidth / naturalVp.width) * (readerSettings.pdfZoom / 100);
     const viewport = page.getViewport({scale});
 
     const wrapper = document.createElement('div');
@@ -3654,7 +3654,7 @@ function toggleSettingsPanel() {
   }
 }
 
-function applyPdfZoom(newZoom) {
+async function applyPdfZoom(newZoom) {
   const contentEl2 = $('reader-content');
   const fraction = contentEl2
     ? contentEl2.scrollTop / (contentEl2.scrollHeight - contentEl2.clientHeight || 1)
@@ -3668,12 +3668,9 @@ function applyPdfZoom(newZoom) {
   if (readerSettings.pdfPaginated) {
     pdfSmartZoomPage(pdfCurrentPage);
   } else {
-    const vp = document.getElementById('pdf-viewport');
-    if (vp) vp.style.zoom = readerSettings.pdfZoom / 100;
+    await reRenderPdf();
     if (contentEl2 && fraction > 0) {
-      requestAnimationFrame(() => {
-        contentEl2.scrollTop = fraction * (contentEl2.scrollHeight - contentEl2.clientHeight);
-      });
+      contentEl2.scrollTop = fraction * (contentEl2.scrollHeight - contentEl2.clientHeight);
     }
   }
 }
@@ -3682,7 +3679,6 @@ async function reRenderPdf() {
   if (!currentPdfBuffer) return;
   const contentEl = $('reader-content');
   if (!contentEl) return;
-  currentPdfDoc = null; // force re-parse with same buffer
   await renderPdf(currentPdfBuffer, contentEl);
   if (readerSettings.pdfPaginated) enterPdfPaginatedMode();
 }
@@ -3716,14 +3712,7 @@ function exitPdfPaginatedMode() {
   contentEl.classList.remove('pdf-paginated');
   contentEl.style.overflow = '';
   contentEl.removeEventListener('click', _pdfPaginatedClick);
-  const wrappers = contentEl.querySelectorAll('.pdf-page-wrapper');
-  wrappers.forEach(w => {
-    w.style.display = '';
-    const canvas = w.querySelector('canvas');
-    if (canvas) canvas.style.transform = '';
-  });
-  const pdfVp = document.getElementById('pdf-viewport');
-  if (pdfVp) pdfVp.style.zoom = readerSettings.pdfZoom / 100;
+  reRenderPdf();
 }
 
 function _pdfPaginatedClick(e) {