diff --git a/frontend/src/lib/components/DocumentThumbnail.svelte b/frontend/src/lib/components/DocumentThumbnail.svelte
index d35cfbf7..fe7050c9 100644
--- a/frontend/src/lib/components/DocumentThumbnail.svelte
+++ b/frontend/src/lib/components/DocumentThumbnail.svelte
@@ -32,18 +32,21 @@ const url = $derived(thumbnailUrl(doc));
 		/>
 	{:else}
 		<div class="flex h-full w-full items-center justify-center text-ink-3" aria-hidden="true">
+			<!-- Generic document icon (heroicons document-text outline). Shown when the
+			     thumbnail hasn't been generated yet — applies equally to PDFs and to
+			     image scans, so we deliberately avoid a PDF-specific glyph here. -->
 			<svg
 				xmlns="http://www.w3.org/2000/svg"
 				fill="none"
 				viewBox="0 0 24 24"
 				stroke-width="1.5"
 				stroke="currentColor"
-				class="h-6 w-6"
+				class="h-8 w-8"
 			>
 				<path
 					stroke-linecap="round"
 					stroke-linejoin="round"
-					d="M19.5 14.25v-2.625a3.375 3.375 0 0 0-3.375-3.375h-1.5A1.125 1.125 0 0 1 13.5 7.125v-1.5a3.375 3.375 0 0 0-3.375-3.375H8.25m0 12.75h7.5m-7.5 3H12M10.5 2.25H5.625c-.621 0-1.125.504-1.125 1.125v17.25c0 .621.504 1.125 1.125 1.125h12.75c.621 0 1.125-.504 1.125-1.125V11.25a9 9 0 0 0-9-9Z"
+					d="M19.5 14.25v-2.625a3.375 3.375 0 0 0-3.375-3.375h-1.5A1.125 1.125 0 0 1 13.5 7.125v-1.5a3.375 3.375 0 0 0-3.375-3.375H8.25m2.25 0H5.625c-.621 0-1.125.504-1.125 1.125v17.25c0 .621.504 1.125 1.125 1.125h12.75c.621 0 1.125-.504 1.125-1.125V11.25a9 9 0 0 0-9-9Z M9 12.75h6M9 15.75h6M9 18.75h3"
 				/>
 			</svg>
 		</div>