diff --git a/static/js/paste_view.js b/static/js/paste_view.js
index acf1290..cf2b0fb 100644
--- a/static/js/paste_view.js
+++ b/static/js/paste_view.js
@@ -260,6 +260,11 @@ function _wireLineClicks() {
                 _hlStart = a; _hlEnd = b;
                 _drawHighlight(a, b);
                 _updateLineUrl(a, b);
+            } else if (_hlStart === lineNum && _hlEnd === lineNum) {
+                // Clicking the sole highlighted line → clear
+                _hlAnchor = null; _hlStart = null; _hlEnd = null;
+                _clearHighlight();
+                _clearLineUrl();
             } else {
                 _hlAnchor = lineNum;
                 _hlStart  = lineNum;
@@ -271,6 +276,21 @@ function _wireLineClicks() {
     });
 }
 
+function _clearHighlight() {
+    const viewPre = document.getElementById('viewPre');
+    if (!viewPre) return;
+    viewPre.querySelectorAll('.line-hl').forEach(el => el.remove());
+    viewPre.querySelectorAll('.line-numbers-rows > span').forEach(
+        s => s.classList.remove('hl-active')
+    );
+}
+
+function _clearLineUrl() {
+    const url = new URL(window.location.href);
+    url.searchParams.delete('L');
+    history.replaceState(null, '', url.toString());
+}
+
 function _drawHighlight(start, end) {
     const viewPre = document.getElementById('viewPre');
     const code    = document.getElementById('codeBlock');