diff --git a/webapp/templates/imaging.html b/webapp/templates/imaging.html
index d04ea72..cdda387 100644
--- a/webapp/templates/imaging.html
+++ b/webapp/templates/imaging.html
@@ -64,6 +64,7 @@ window.addEventListener('DOMContentLoaded', scheduleImagingReload);
   {% set border = 'danger' if is_failed else ('success' if is_done else 'primary') %}
   {% set friendly = stage_labels.get(stage_idx, ('Stage ' ~ stage_idx, '')) %}
   <details class="card border-{{ border }} mb-2 shadow-sm imaging-card"
+       data-serial="{{ s.serial }}"
        data-filter="{{ s.serial|lower }} {{ (s.hostname_target or '')|lower }} {{ (s.pctype or '')|lower }} {{ (s.machinenumber or '')|lower }} {{ (s.intune_device_id or '')|lower }} {{ friendly[0]|lower }} stage-{{ stage_idx }} {{ (s.status or 'in_progress')|lower }}">
     <summary class="card-body py-2" style="cursor:pointer; list-style:none;">
       <div class="d-flex flex-wrap gap-3 align-items-center">
@@ -340,6 +341,32 @@ window.addEventListener('DOMContentLoaded', function() {
     });
 });
 
+// Persist tile expanded/collapsed state across page refresh via
+// localStorage. Set of expanded serials lives at 'imaging-expanded'.
+(function() {
+    var KEY = 'imaging-expanded';
+    function loadSet() {
+        try { return new Set(JSON.parse(localStorage.getItem(KEY) || '[]')); }
+        catch (e) { return new Set(); }
+    }
+    function saveSet(set) {
+        try { localStorage.setItem(KEY, JSON.stringify(Array.from(set))); }
+        catch (e) {}
+    }
+    window.addEventListener('DOMContentLoaded', function() {
+        var expanded = loadSet();
+        document.querySelectorAll('.imaging-card').forEach(function(card) {
+            var serial = card.getAttribute('data-serial');
+            if (serial && expanded.has(serial)) card.open = true;
+            card.addEventListener('toggle', function() {
+                var s = loadSet();
+                if (card.open) s.add(serial); else s.delete(serial);
+                saveSet(s);
+            });
+        });
+    });
+})();
+
 // Client-side filter: hide imaging-card elements whose data-filter doesn't
 // match the search query. Live as user types. Pauses auto-reload while
 // the input is focused or non-empty so typing isn't interrupted by refresh.