diff --git a/client/src/pages/project-detail/item-thumbnail.tsx b/client/src/pages/project-detail/item-thumbnail.tsx
index b91f62c..53117a1 100644
--- a/client/src/pages/project-detail/item-thumbnail.tsx
+++ b/client/src/pages/project-detail/item-thumbnail.tsx
@@ -3,13 +3,14 @@ import { useState } from 'react';
 interface ItemThumbnailProps {
   url: string | null;
   alt: string;
-  size?: 'sm' | 'md';
+  size?: 'sm' | 'md' | 'lg';
   onClick?: () => void;
 }
 
 const sizeClassMap: Record<Required<ItemThumbnailProps>['size'], string> = {
   sm: 'h-14 w-14',
-  md: 'h-20 w-20'
+  md: 'h-20 w-20',
+  lg: 'h-28 w-28'
 };
 
 export function ItemThumbnail({ url, alt, size = 'sm', onClick }: ItemThumbnailProps) {
diff --git a/client/src/pages/project-detail/project-items-desktop-table.tsx b/client/src/pages/project-detail/project-items-desktop-table.tsx
index b7fe815..aaee53b 100644
--- a/client/src/pages/project-detail/project-items-desktop-table.tsx
+++ b/client/src/pages/project-detail/project-items-desktop-table.tsx
@@ -13,6 +13,7 @@ interface ProjectItemsDesktopTableProps {
   onEditItem: (item: Item) => void;
   projectId: string | undefined;
   onViewItemImages: (item: Item) => void;
+  showLargeImages: boolean;
 }
 
 export function ProjectItemsDesktopTable({
@@ -22,7 +23,8 @@ export function ProjectItemsDesktopTable({
   onTogglePrices,
   onEditItem,
   projectId,
-  onViewItemImages
+  onViewItemImages,
+  showLargeImages
 }: ProjectItemsDesktopTableProps) {
   return (
     <div className="hidden md:block">
@@ -64,7 +66,7 @@ export function ProjectItemsDesktopTable({
                         <ItemThumbnail
                           url={item.defaultImageUrl}
                           alt={displayName}
-                          size="sm"
+                          size={showLargeImages ? 'md' : 'sm'}
                           onClick={() => onViewItemImages(item)}
                         />
                         <div className="flex flex-1 flex-col gap-1">
diff --git a/client/src/pages/project-detail/project-items-header.tsx b/client/src/pages/project-detail/project-items-header.tsx
index ab18cfe..0d01ccf 100644
--- a/client/src/pages/project-detail/project-items-header.tsx
+++ b/client/src/pages/project-detail/project-items-header.tsx
@@ -4,6 +4,8 @@ interface ProjectItemsHeaderProps {
   showDifferencesOnly: boolean;
   hasAttributeDifferences: boolean;
   onToggleDifferences: (value: boolean) => void;
+  showLargeImages: boolean;
+  onToggleLargeImages: (value: boolean) => void;
 }
 
 export function ProjectItemsHeader({
@@ -11,7 +13,9 @@ export function ProjectItemsHeader({
   isLoading,
   showDifferencesOnly,
   hasAttributeDifferences,
-  onToggleDifferences
+  onToggleDifferences,
+  showLargeImages,
+  onToggleLargeImages
 }: ProjectItemsHeaderProps) {
   const subtitle = isLoading
     ? 'Loading items…'
@@ -25,16 +29,27 @@ export function ProjectItemsHeader({
         <h2 className="text-xl font-semibold text-slate-900">Items</h2>
         <p className="text-sm text-slate-500">{subtitle}</p>
       </div>
-      <label className="flex items-center gap-2 text-xs font-medium uppercase tracking-wide text-slate-500">
-        <input
-          type="checkbox"
-          className="h-4 w-4 rounded border-slate-300 text-blue-600 focus:ring-blue-500 disabled:cursor-not-allowed disabled:border-slate-200 disabled:text-slate-300"
-          checked={showDifferencesOnly}
-          onChange={(event) => onToggleDifferences(event.target.checked)}
-          disabled={!hasAttributeDifferences}
-        />
-        Show differences only
-      </label>
+      <div className="flex flex-col gap-3 text-xs font-medium uppercase tracking-wide text-slate-500 md:flex-row md:items-center md:gap-6">
+        <label className="flex items-center gap-2">
+          <input
+            type="checkbox"
+            className="h-4 w-4 rounded border-slate-300 text-blue-600 focus:ring-blue-500 disabled:cursor-not-allowed disabled:border-slate-200 disabled:text-slate-300"
+            checked={showDifferencesOnly}
+            onChange={(event) => onToggleDifferences(event.target.checked)}
+            disabled={!hasAttributeDifferences}
+          />
+          Show differences only
+        </label>
+        <label className="flex items-center gap-2">
+          <input
+            type="checkbox"
+            className="h-4 w-4 rounded border-slate-300 text-blue-600 focus:ring-blue-500"
+            checked={showLargeImages}
+            onChange={(event) => onToggleLargeImages(event.target.checked)}
+          />
+          Larger images
+        </label>
+      </div>
     </header>
   );
 }
diff --git a/client/src/pages/project-detail/project-items-mobile-list.tsx b/client/src/pages/project-detail/project-items-mobile-list.tsx
index 5f84da0..0fceba7 100644
--- a/client/src/pages/project-detail/project-items-mobile-list.tsx
+++ b/client/src/pages/project-detail/project-items-mobile-list.tsx
@@ -12,6 +12,7 @@ interface ProjectItemsMobileListProps {
   onEditItem: (item: Item) => void;
   projectId: string | undefined;
   onViewItemImages: (item: Item) => void;
+  showLargeImages: boolean;
 }
 
 export function ProjectItemsMobileList({
@@ -21,7 +22,8 @@ export function ProjectItemsMobileList({
   onTogglePrices,
   onEditItem,
   projectId,
-  onViewItemImages
+  onViewItemImages,
+  showLargeImages
 }: ProjectItemsMobileListProps) {
   return (
     <div className="space-y-4 md:hidden">
@@ -38,7 +40,7 @@ export function ProjectItemsMobileList({
               <ItemThumbnail
                 url={item.defaultImageUrl}
                 alt={displayName}
-                size="md"
+                size={showLargeImages ? 'lg' : 'md'}
                 onClick={() => onViewItemImages(item)}
               />
               <div className="flex flex-1 flex-col gap-2">
diff --git a/client/src/pages/project-detail/project-items-section.tsx b/client/src/pages/project-detail/project-items-section.tsx
index 6484aed..129e6a2 100644
--- a/client/src/pages/project-detail/project-items-section.tsx
+++ b/client/src/pages/project-detail/project-items-section.tsx
@@ -39,6 +39,7 @@ export function ProjectItemsSection({
 }: ProjectItemsSectionProps) {
   const [showDifferencesOnly, setShowDifferencesOnly] = useState(false);
   const [expandedItemId, setExpandedItemId] = useState<string | null>(null);
+  const [showLargeImages, setShowLargeImages] = useState(false);
 
   const mismatchedAttributes = useMemo(() => {
     const result = new Set<string>();
@@ -117,6 +118,8 @@ export function ProjectItemsSection({
           showDifferencesOnly={showDifferencesOnly}
           hasAttributeDifferences={hasAttributeDifferences}
           onToggleDifferences={(value) => setShowDifferencesOnly(value)}
+          showLargeImages={showLargeImages}
+          onToggleLargeImages={(value) => setShowLargeImages(value)}
         />
 
         {error ? (
@@ -137,6 +140,7 @@ export function ProjectItemsSection({
           onEditItem={onEditItem}
           projectId={projectId}
           onViewItemImages={onViewItemImages}
+          showLargeImages={showLargeImages}
         />
 
         <ProjectItemsMobileList
@@ -147,6 +151,7 @@ export function ProjectItemsSection({
           onEditItem={onEditItem}
           projectId={projectId}
           onViewItemImages={onViewItemImages}
+          showLargeImages={showLargeImages}
         />
       </section>