diff --git a/webui/src/components/display/BlobPreview.svelte b/webui/src/components/display/BlobPreview.svelte
index 00d9df8..8574116 100644
--- a/webui/src/components/display/BlobPreview.svelte
+++ b/webui/src/components/display/BlobPreview.svelte
@@ -15,7 +15,7 @@
   );
   $: image = mimeType.startsWith("image");
   $: text = mimeType.startsWith("text");
-  $: pdf = mimeType.startsWith("pdf");
+  $: pdf = mimeType.startsWith("application/pdf");
   $: model = mimeType?.startsWith("model");
 
   $: handled = audio || video || image || text || pdf || model;