diff --git a/src/PowderCoating.Web/Views/Inventory/Details.cshtml b/src/PowderCoating.Web/Views/Inventory/Details.cshtml
index f5926ce..23ec7a1 100644
--- a/src/PowderCoating.Web/Views/Inventory/Details.cshtml
+++ b/src/PowderCoating.Web/Views/Inventory/Details.cshtml
@@ -5,6 +5,11 @@
     ViewData["PageIcon"] = "bi-box-seam";
     ViewData["PageHelpTitle"] = "Inventory Item";
     ViewData["PageHelpContent"] = "Full detail for this inventory item. Stock Information shows current quantity and reorder thresholds — a Low Stock banner appears when quantity is at or below the Reorder Point. Pricing shows Unit Cost (what you paid), Average Cost (weighted average across purchases), and Total Stock Value. Use the Actions panel to edit, view jobs using this powder, or delete the item.";
+
+    string SafeUrl(string? url) =>
+        string.IsNullOrEmpty(url) ? "#"
+        : (url.StartsWith("http://", StringComparison.OrdinalIgnoreCase) || url.StartsWith("https://", StringComparison.OrdinalIgnoreCase))
+            ? url : "https://" + url;
 }
 
 @section Styles {
@@ -184,7 +189,7 @@
                                     <div class="col-12">
                                         <label class="text-muted small mb-1">Product URL</label>
                                         <p class="mb-0">
-                                            <a href="@Model.SpecPageUrl" target="_blank" class="text-decoration-none">
+                                            <a href="@SafeUrl(Model.SpecPageUrl)" target="_blank" class="text-decoration-none">
                                                 <i class="bi bi-box-arrow-up-right me-1"></i>View on Manufacturer's Web Site
                                             </a>
                                         </p>
@@ -197,13 +202,13 @@
                                         <div class="d-flex gap-2 flex-wrap">
                                             @if (!string.IsNullOrEmpty(Model.SdsUrl))
                                             {
-                                                <a href="@Model.SdsUrl" target="_blank" class="btn btn-sm btn-outline-secondary">
+                                                <a href="@SafeUrl(Model.SdsUrl)" target="_blank" class="btn btn-sm btn-outline-secondary">
                                                     <i class="bi bi-file-earmark-pdf me-1"></i>Safety Data Sheet
                                                 </a>
                                             }
                                             @if (!string.IsNullOrEmpty(Model.TdsUrl))
                                             {
-                                                <a href="@Model.TdsUrl" target="_blank" class="btn btn-sm btn-outline-secondary">
+                                                <a href="@SafeUrl(Model.TdsUrl)" target="_blank" class="btn btn-sm btn-outline-secondary">
                                                     <i class="bi bi-file-earmark-text me-1"></i>Technical Data Sheet
                                                 </a>
                                             }
diff --git a/src/PowderCoating.Web/wwwroot/js/inventory-catalog-lookup.js b/src/PowderCoating.Web/wwwroot/js/inventory-catalog-lookup.js
index 7748a31..b2a38e9 100644
--- a/src/PowderCoating.Web/wwwroot/js/inventory-catalog-lookup.js
+++ b/src/PowderCoating.Web/wwwroot/js/inventory-catalog-lookup.js
@@ -413,10 +413,15 @@
 
     // ── Helpers ───────────────────────────────────────────────────────────────
 
+    function ensureAbsoluteUrl(url) {
+        if (!url) return url;
+        return /^https?:\/\//i.test(url) ? url : 'https://' + url;
+    }
+
     function syncLinkButton(inputId, linkId, url) {
         const link = document.getElementById(linkId);
         if (!link) return;
-        if (url) { link.href = url; link.classList.remove('d-none'); }
+        if (url) { link.href = ensureAbsoluteUrl(url); link.classList.remove('d-none'); }
         else      { link.classList.add('d-none'); }
     }
 
diff --git a/src/PowderCoating.Web/wwwroot/js/inventory-label-scan.js b/src/PowderCoating.Web/wwwroot/js/inventory-label-scan.js
index 91d9ce2..6406a2e 100644
--- a/src/PowderCoating.Web/wwwroot/js/inventory-label-scan.js
+++ b/src/PowderCoating.Web/wwwroot/js/inventory-label-scan.js
@@ -550,10 +550,15 @@
         });
     }
 
+    function ensureAbsoluteUrl(url) {
+        if (!url) return url;
+        return /^https?:\/\//i.test(url) ? url : 'https://' + url;
+    }
+
     function syncLink(inputId, linkId, url) {
         const link = document.getElementById(linkId);
         if (!link) return;
-        if (url) { link.href = url; link.classList.remove('d-none'); }
+        if (url) { link.href = ensureAbsoluteUrl(url); link.classList.remove('d-none'); }
         else      { link.classList.add('d-none'); }
     }