diff --git a/static/css/app.css b/static/css/app.css
index fb20a2c..5827f44 100644
--- a/static/css/app.css
+++ b/static/css/app.css
@@ -1725,6 +1725,7 @@ body.reader-immersive.reader-show-bottom .reader-overlay  { bottom: var(--bar-h)
 .hl-note-btn { background:none; border:1px solid var(--border); color:var(--fg); padding:2px 6px; border-radius:var(--radius); cursor:pointer; }
 
 /* Highlight marks */
+.reader-no-bold * { font-weight: normal !important; }
 .epub-highlight { border-radius:2px; cursor:pointer; }
 .epub-highlight[data-color="yellow"] { background:rgba(241,196,15,.4); }
 .epub-highlight[data-color="green"]  { background:rgba(46,204,113,.35); }
diff --git a/static/js/app.js b/static/js/app.js
index a99d822..bb6e526 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -2743,7 +2743,7 @@ async function _evictBookCache(bookList) {
 
 // Reader settings
 let readerSettings = { fontSize: 16, lineHeight: 1.8, maxWidth: 65, theme: 'dark',
-                        fontFamily: 'serif',
+                        fontFamily: 'serif', noBold: false,
                         pdfZoom: 100, pdfInverted: false, pdfPaginated: false, pdfSpread: false };
 let readerSettingsPanelOpen = false;
 let currentPdfDoc = null;
@@ -3580,7 +3580,7 @@ function jumpToTocEntry(href) {
 function loadReaderSettings(bookId) {
   // Reset to defaults, then apply per-book overrides
   Object.assign(readerSettings, { fontSize: 16, lineHeight: 1.8, maxWidth: 65, theme: 'dark',
-                                   fontFamily: 'serif',
+                                   fontFamily: 'serif', noBold: false,
                                    pdfZoom: 100, pdfInverted: false, pdfPaginated: false, pdfSpread: false });
   try {
     const saved = JSON.parse(localStorage.getItem(`diora_reader_settings_${bookId}`) || '{}');
@@ -3613,6 +3613,7 @@ function applyReaderSettings(isPdf) {
       mono:     "'Courier New', monospace",
     };
     contentEl.style.fontFamily = fontMap[readerSettings.fontFamily] || fontMap.serif;
+    contentEl.classList.toggle('reader-no-bold', !!readerSettings.noBold);
     if (_currentPositionAnchor && currentBookId) {
       requestAnimationFrame(() => restoreFromAnchor($('reader-content'), _currentPositionAnchor));
     }
@@ -3657,6 +3658,7 @@ function toggleSettingsPanel() {
       <button class="btn btn-sm ${readerSettings.fontFamily === 'sans'     ? 'active' : ''}" data-rs-font="sans">Sans</button>
       <button class="btn btn-sm ${readerSettings.fontFamily === 'humanist' ? 'active' : ''}" data-rs-font="humanist">Verdana</button>
       <button class="btn btn-sm ${readerSettings.fontFamily === 'mono'     ? 'active' : ''}" data-rs-font="mono">Mono</button>
+      <button class="btn btn-sm ${readerSettings.noBold ? 'active' : ''}" id="rs-no-bold">Kein Fett</button>
       <button class="btn btn-sm ${readerSettings.theme === 'dark'   ? 'active' : ''}" data-rs-theme="dark">Dark</button>
       <button class="btn btn-sm ${readerSettings.theme === 'sepia'  ? 'active' : ''}" data-rs-theme="sepia">Sepia</button>
       <button class="btn btn-sm ${readerSettings.theme === 'bright' ? 'active' : ''}" data-rs-theme="bright">Bright</button>
@@ -3716,6 +3718,13 @@ function toggleSettingsPanel() {
       });
     });
 
+    panel.querySelector('#rs-no-bold').addEventListener('click', function () {
+      readerSettings.noBold = !readerSettings.noBold;
+      this.classList.toggle('active', readerSettings.noBold);
+      applyReaderSettings(false);
+      saveReaderSettings();
+    });
+
     panel.querySelectorAll('[data-rs-theme]').forEach(btn => {
       btn.addEventListener('click', () => {
         readerSettings.theme = btn.dataset.rsTheme;