diff --git a/webui/src/components/display/BlobPreview.svelte b/webui/src/components/display/BlobPreview.svelte
index 110def4..ba4bfb7 100644
--- a/webui/src/components/display/BlobPreview.svelte
+++ b/webui/src/components/display/BlobPreview.svelte
@@ -6,43 +6,26 @@
   import VideoViewer from "./blobs/VideoViewer.svelte";
   import HashBadge from "./HashBadge.svelte";
   import { API_URL } from "../../lib/api";
-  import { GROUP_TYPE_ADDR } from "upend/constants";
   import { createEventDispatcher } from "svelte";
+  import { getTypes } from "../../util/mediatypes";
   const dispatch = createEventDispatcher();
 
   export let address: string;
   export let recurse = 3;
 
   $: ({ entity, entityInfo } = useEntity(address));
-
-  $: mimeType = String($entity?.get("FILE_MIME"));
-
-  $: audio =
-    ["audio", "application/x-riff"].some((p) => mimeType.startsWith(p)) &&
-    !video;
-  $: video =
-    ["video", "application/x-matroska"].some((p) => mimeType.startsWith(p)) ||
-    $entity?.identify().some((l) => l.endsWith(".avi"));
-  $: image = mimeType.startsWith("image");
-  $: text = mimeType.startsWith("text");
-  $: model =
-    mimeType?.startsWith("model") ||
-    $entity?.identify().some((l) => l.endsWith(".stl"));
-  $: web = $entityInfo?.t == "Url";
-  $: fragment = Boolean($entity?.get("ANNOTATES"));
-
-  $: group = $entity?.get("IS") == GROUP_TYPE_ADDR;
+  $: types = getTypes($entity, $entityInfo);
 
   $: handled =
     !$entity ||
-    audio ||
-    video ||
-    image ||
-    text ||
-    model ||
-    web ||
-    fragment ||
-    (group && recurse > 0);
+    types.audio ||
+    types.video ||
+    types.image ||
+    types.text ||
+    types.model ||
+    types.web ||
+    types.fragment ||
+    (types.group && recurse > 0);
 
   $: dispatch("handled", handled);
 
@@ -80,7 +63,7 @@
 
 <div class="preview" bind:clientHeight>
   {#if handled}
-    {#if group}
+    {#if types.group}
       <ul class="group">
         {#each groupChildren as address (address)}
           <li>
@@ -94,9 +77,9 @@
           </li>
         {/each}
       </ul>
-    {:else if model}
+    {:else if types.model}
       <ModelViewer lookonly src="{API_URL}/raw/{address}" />
-    {:else if web}
+    {:else if types.web}
       {#if imageLoaded != address}
         <Spinner />
       {/if}
@@ -106,11 +89,11 @@
         on:load={() => (imageLoaded = address)}
         on:error={() => (handled = false)}
       />
-    {:else if fragment}
+    {:else if types.fragment}
       <FragmentViewer {address} detail={false} />
-    {:else if video}
+    {:else if types.video}
       <VideoViewer {address} detail={false} />
-    {:else if audio}
+    {:else if types.audio}
       <div class="audiopreview image">
         {#if handled && imageLoaded != address}
           <div class="spinner">
@@ -137,7 +120,7 @@
           </div>
         {/if}
         <img
-          src="{API_URL}/{mimeType?.includes('svg+xml')
+          src="{API_URL}/{types.mimeType?.includes('svg+xml')
             ? 'raw'
             : 'thumb'}/{address}?size=512&quality=75"
           alt="Thumbnail for {address}..."
diff --git a/webui/src/components/display/BlobViewer.svelte b/webui/src/components/display/BlobViewer.svelte
index f558398..cb74009 100644
--- a/webui/src/components/display/BlobViewer.svelte
+++ b/webui/src/components/display/BlobViewer.svelte
@@ -10,6 +10,7 @@
   import UpLink from "./UpLink.svelte";
   import { API_URL } from "../../lib/api";
   import { createEventDispatcher } from "svelte";
+  import { getTypes } from "../../util/mediatypes";
   const dispatch = createEventDispatcher();
 
   export let address: string;
@@ -19,26 +20,17 @@
   let handled = false;
 
   $: ({ entity, entityInfo } = useEntity(address));
-
-  $: mimeType = String($entity?.get("FILE_MIME"));
-
-  $: audio =
-    ["audio", "application/x-riff"].some((p) => mimeType.startsWith(p)) &&
-    !video;
-  $: video =
-    ["video", "application/x-matroska"].some((p) => mimeType.startsWith(p)) ||
-    $entity?.identify().some((l) => l.endsWith(".avi"));
-  $: image = mimeType.startsWith("image");
-  $: text = mimeType.startsWith("text");
-  $: pdf = mimeType.startsWith("application/pdf");
-  $: model =
-    mimeType?.startsWith("model") ||
-    $entity?.identify().some((l) => l.endsWith(".stl"));
-  $: web = $entityInfo?.t == "Url";
-  $: fragment = Boolean($entity?.get("ANNOTATES"));
+  $: types = getTypes($entity, $entityInfo);
 
   $: handled =
-    audio || video || image || text || pdf || model || web || fragment;
+    types.audio ||
+    types.video ||
+    types.image ||
+    types.text ||
+    types.pdf ||
+    types.model ||
+    types.web ||
+    types.fragment;
 
   $: dispatch("handled", handled);
 
@@ -47,30 +39,30 @@
 
 {#if handled}
   <div class="preview" class:detail>
-    {#if text}
+    {#if types.text}
       <div class="text">
         <TextViewer {address} />
       </div>
     {/if}
-    {#if audio}
+    {#if types.audio}
       <AudioViewer {address} {detail} {editable} />
     {/if}
-    {#if video}
+    {#if types.video}
       <VideoViewer detail {address} />
     {/if}
-    {#if image}
+    {#if types.image}
       <ImageViewer {address} {editable} {detail} />
     {/if}
-    {#if pdf}
+    {#if types.pdf}
       <iframe
         src="{API_URL}/raw/{address}?inline"
         title="PDF document of {address}"
       />
     {/if}
-    {#if model}
+    {#if types.model}
       <ModelViewer src="{API_URL}/raw/{address}" />
     {/if}
-    {#if web}
+    {#if types.web}
       {#if imageLoaded != address}
         <Spinner />
       {/if}
@@ -81,7 +73,7 @@
         on:error={() => (handled = false)}
       />
     {/if}
-    {#if fragment}
+    {#if types.fragment}
       <UpLink passthrough to={{ entity: String($entity.get("ANNOTATES")) }}>
         <FragmentViewer {address} {detail} />
       </UpLink>
diff --git a/webui/src/util/mediatypes.ts b/webui/src/util/mediatypes.ts
new file mode 100644
index 0000000..0d9513f
--- /dev/null
+++ b/webui/src/util/mediatypes.ts
@@ -0,0 +1,37 @@
+import type { EntityInfo } from "src/lib/entity";
+import type { UpObject } from "upend";
+import { GROUP_TYPE_ADDR } from "upend/constants";
+
+export function getTypes(entity: UpObject, entityInfo: EntityInfo) {
+  const mimeType = String(entity?.get("FILE_MIME"));
+
+  const video =
+    ["video", "application/x-matroska"].some((p) => mimeType.startsWith(p)) ||
+    entity?.identify().some((l) => l.endsWith(".avi"));
+  const audio =
+    ["audio", "application/x-riff"].some((p) => mimeType.startsWith(p)) &&
+    !video;
+  const image = mimeType.startsWith("image");
+  const text = mimeType.startsWith("text");
+  const pdf = mimeType.startsWith("application/pdf");
+  const model =
+    mimeType?.startsWith("model") ||
+    entity?.identify().some((l) => l.endsWith(".stl"));
+  const web = entityInfo?.t == "Url";
+  const fragment = Boolean(entity?.get("ANNOTATES"));
+
+  const group = entity?.get("IS") == GROUP_TYPE_ADDR;
+
+  return {
+    mimeType,
+    audio,
+    video,
+    image,
+    text,
+    pdf,
+    model,
+    web,
+    fragment,
+    group,
+  };
+}