diff --git a/frontend/pages/communication/chat.vue b/frontend/pages/communication/chat.vue
index b9b0878..29ebc17 100644
--- a/frontend/pages/communication/chat.vue
+++ b/frontend/pages/communication/chat.vue
@@ -17,6 +17,7 @@ const matrixMembers = ref([])
 const matrixMessageDraft = ref("")
 const matrixMessagesViewport = ref(null)
 const matrixAttachmentInput = ref(null)
+const matrixAttachmentObjectUrls = ref({})
 const roomCreateOpen = ref(false)
 const collapsedRoomGroups = ref({})
 const matrixCallOpen = ref(false)
@@ -56,6 +57,7 @@ let matrixMessagesRequestActive = false
 let matrixMembersRequestActive = false
 let matrixLiveKitRoom = null
 const matrixCallVideoElements = new Map()
+const matrixAttachmentPreviewRequests = new Set()
 
 const canUseMatrixChat = computed(() =>
   Boolean(status.value?.reachable && status.value?.provisioningConfigured)
@@ -286,6 +288,7 @@ const mergeMatrixMessages = (incomingMessages) => {
 
   matrixMessages.value = Array.from(byId.values())
     .sort((a, b) => (a.timestamp || 0) - (b.timestamp || 0))
+  loadAttachmentPreviews()
 }
 
 const scrollMessagesToBottom = async () => {
@@ -845,6 +848,7 @@ const sendMatrixMessage = async () => {
     matrixMessages.value = matrixMessages.value.map((item) =>
       item.id === optimisticId ? message : item
     )
+    loadAttachmentPreviews()
   } catch (error) {
     matrixMessages.value = matrixMessages.value.map((item) =>
       item.id === optimisticId ? { ...item, pending: false, failed: true } : item
@@ -967,6 +971,37 @@ const matrixMediaProxyUrl = (attachment) => {
   return `/api/communication/matrix/media?${params.toString()}`
 }
 
+const attachmentObjectUrl = (attachment) =>
+  attachment?.url ? matrixAttachmentObjectUrls.value[attachment.url] || "" : ""
+
+const ensureAttachmentObjectUrl = async (attachment) => {
+  if (!attachment?.url || matrixAttachmentObjectUrls.value[attachment.url] || matrixAttachmentPreviewRequests.has(attachment.url)) return
+
+  matrixAttachmentPreviewRequests.add(attachment.url)
+  try {
+    const blob = await $api(matrixMediaProxyUrl(attachment), {
+      responseType: "blob"
+    })
+    const objectUrl = URL.createObjectURL(blob)
+    matrixAttachmentObjectUrls.value = {
+      ...matrixAttachmentObjectUrls.value,
+      [attachment.url]: objectUrl
+    }
+  } catch (error) {
+    // Fällt nur auf den Link zurück; der Chat selbst soll weiter funktionieren.
+  } finally {
+    matrixAttachmentPreviewRequests.delete(attachment.url)
+  }
+}
+
+const loadAttachmentPreviews = () => {
+  for (const message of matrixMessages.value) {
+    if (message.attachment?.isImage && message.attachment.url) {
+      ensureAttachmentObjectUrl(message.attachment)
+    }
+  }
+}
+
 const formatLastUpdated = computed(() => {
   if (!lastUpdated.value) return "Noch nicht aktualisiert"
 
@@ -990,6 +1025,7 @@ onBeforeUnmount(() => {
   stopMatrixAutoRefresh()
   stopMatrixCallDurationTimer()
   leaveMatrixCall()
+  Object.values(matrixAttachmentObjectUrls.value).forEach((objectUrl) => URL.revokeObjectURL(objectUrl))
 })
 </script>
 
@@ -1404,8 +1440,8 @@ onBeforeUnmount(() => {
                 :class="message.own ? 'border-white/20' : 'border-default'"
             >
               <img
-                  v-if="message.attachment.isImage && message.attachment.url"
-                  :src="matrixMediaProxyUrl(message.attachment)"
+                  v-if="message.attachment.isImage && attachmentObjectUrl(message.attachment)"
+                  :src="attachmentObjectUrl(message.attachment)"
                   :alt="message.attachment.fileName || message.body"
                   class="max-h-72 w-full object-contain"
               >