diff --git a/frontend/components/task/TaskDocumentList.vue b/frontend/components/task/TaskDocumentList.vue
index 270f8c2..a9be141 100644
--- a/frontend/components/task/TaskDocumentList.vue
+++ b/frontend/components/task/TaskDocumentList.vue
@@ -68,6 +68,7 @@ function isImage(mimeType: string): boolean {
 }
 
 function getIconForMime(mimeType: string): string {
+    if (mimeType === 'text/markdown') return 'mdi:language-markdown'
     if (mimeType === 'application/pdf') return 'heroicons:document-text'
     if (mimeType.includes('spreadsheet') || mimeType.includes('excel')) return 'heroicons:table-cells'
     if (mimeType.includes('word') || mimeType.includes('document')) return 'heroicons:document'
diff --git a/frontend/components/task/TaskDocumentPreview.vue b/frontend/components/task/TaskDocumentPreview.vue
index 8e7f2d3..deb7781 100644
--- a/frontend/components/task/TaskDocumentPreview.vue
+++ b/frontend/components/task/TaskDocumentPreview.vue
@@ -58,6 +58,46 @@
                         class="h-[85vh] w-[80vw] rounded-lg bg-white"
                     />
 
+                    <!-- Text / Markdown preview -->
+                    <div
+                        v-else-if="isText"
+                        class="flex max-h-[85vh] w-[85vw] max-w-3xl flex-col overflow-hidden rounded-xl bg-white"
+                    >
+                        <div class="flex items-center justify-between gap-2 border-b border-neutral-200 px-4 py-3">
+                            <p class="truncate text-sm font-medium text-neutral-700">{{ document.originalName }}</p>
+                            <div class="flex shrink-0 items-center gap-2">
+                                <button
+                                    type="button"
+                                    class="inline-flex items-center gap-1.5 rounded-lg bg-neutral-100 px-3 py-1.5 text-sm font-medium text-neutral-700 transition-colors hover:bg-neutral-200"
+                                    @click="copyContent"
+                                >
+                                    <Icon
+                                        :name="copied ? 'heroicons:check' : 'mdi:content-copy'"
+                                        class="h-4 w-4"
+                                        :class="copied ? 'text-green-600' : ''"
+                                    />
+                                    {{ copied ? $t('taskDocuments.copied') : $t('taskDocuments.copy') }}
+                                </button>
+                                <a
+                                    :href="downloadUrl"
+                                    download
+                                    class="inline-flex items-center gap-1.5 rounded-lg bg-blue-600 px-3 py-1.5 text-sm font-semibold text-white transition-colors hover:bg-blue-700"
+                                >
+                                    {{ $t('taskDocuments.download') }}
+                                </a>
+                            </div>
+                        </div>
+                        <div class="overflow-auto p-4">
+                            <div v-if="loadingText" class="flex justify-center py-10">
+                                <Icon name="heroicons:arrow-path" class="h-6 w-6 animate-spin text-neutral-400" />
+                            </div>
+                            <pre
+                                v-else
+                                class="whitespace-pre-wrap break-words font-mono text-xs leading-relaxed text-neutral-800"
+                            >{{ textContent }}</pre>
+                        </div>
+                    </div>
+
                     <!-- Generic file -->
                     <div v-else class="flex flex-col items-center gap-4 rounded-xl bg-white p-10">
                         <Icon name="heroicons:document" class="h-16 w-16 text-neutral-400" />
@@ -73,7 +113,7 @@
                     </div>
 
                     <!-- File name footer -->
-                    <p class="mt-3 text-sm text-white/70">{{ document.originalName }}</p>
+                    <p v-if="!isText" class="mt-3 text-sm text-white/70">{{ document.originalName }}</p>
                 </div>
             </div>
         </Transition>
@@ -98,19 +138,56 @@ defineEmits<{
 }>()
 
 const overlayRef = ref<HTMLElement | null>(null)
+const textContent = ref('')
+const loadingText = ref(false)
+const copied = ref(false)
 
-const { getDownloadUrl } = useTaskDocumentService()
+const { getDownloadUrl, getContent } = useTaskDocumentService()
+const { t } = useI18n()
+
+const TEXT_MIME_TYPES = ['text/markdown', 'text/plain', 'text/csv', 'application/json', 'application/xml', 'text/xml']
+
+function isTextDocument(doc: TaskDocument | null): boolean {
+    if (!doc) return false
+    if (TEXT_MIME_TYPES.includes(doc.mimeType)) return true
+    return /\.(md|markdown|txt|csv|json|xml)$/i.test(doc.originalName)
+}
 
 const downloadUrl = computed(() => props.document ? getDownloadUrl(props.document.id) : '')
 const isImage = computed(() => props.document?.mimeType.startsWith('image/') ?? false)
 const isPdf = computed(() => props.document?.mimeType === 'application/pdf')
+const isText = computed(() => isTextDocument(props.document))
 
-// Focus overlay for keyboard events
-watch(() => props.document, (doc) => {
-    if (doc) {
-        nextTick(() => overlayRef.value?.focus())
+async function copyContent() {
+    try {
+        await navigator.clipboard.writeText(textContent.value)
+        copied.value = true
+        useToast().success(t('taskDocuments.copied'))
+        setTimeout(() => { copied.value = false }, 2000)
+    } catch {
+        // Clipboard unavailable
     }
-})
+}
+
+// Focus overlay for keyboard events, and load text content for text/markdown documents
+watch(() => props.document, async (doc) => {
+    textContent.value = ''
+    copied.value = false
+    if (!doc) return
+
+    nextTick(() => overlayRef.value?.focus())
+
+    if (isTextDocument(doc)) {
+        loadingText.value = true
+        try {
+            textContent.value = await getContent(doc.id)
+        } catch {
+            textContent.value = ''
+        } finally {
+            loadingText.value = false
+        }
+    }
+}, { immediate: true })
 </script>
 
 <style scoped>
diff --git a/frontend/i18n/locales/fr.json b/frontend/i18n/locales/fr.json
index 4391b3f..82b80d2 100644
--- a/frontend/i18n/locales/fr.json
+++ b/frontend/i18n/locales/fr.json
@@ -126,6 +126,8 @@
         "confirmDeleteTitle": "Supprimer le document",
         "confirmDeleteMessage": "Êtes-vous sûr de vouloir supprimer ce document ?",
         "download": "Télécharger",
+        "copy": "Copier",
+        "copied": "Contenu copié !",
         "maxSizeError": "Le fichier dépasse la taille maximale de 50 Mo."
     },
     "tasks": {
diff --git a/frontend/services/task-documents.ts b/frontend/services/task-documents.ts
index 6560e8d..de30ae1 100644
--- a/frontend/services/task-documents.ts
+++ b/frontend/services/task-documents.ts
@@ -41,5 +41,12 @@ export function useTaskDocumentService() {
         return `${baseURL}/task_documents/${id}/download`
     }
 
-    return { getByTask, upload, remove, getDownloadUrl }
+    async function getContent(id: number): Promise<string> {
+        return $fetch<string>(`${baseURL}/task_documents/${id}/download`, {
+            credentials: 'include',
+            responseType: 'text',
+        })
+    }
+
+    return { getByTask, upload, remove, getDownloadUrl, getContent }
 }