diff --git a/docs/FRONTEND.md b/docs/FRONTEND.md
index 8b5b958..a3ea702 100644
--- a/docs/FRONTEND.md
+++ b/docs/FRONTEND.md
@@ -60,11 +60,13 @@ No router library — a tiny history wrapper (`lib/route.ts`: `navigate()`,
   share button), message list (`Markdown` for assistant, emerald bubble for
   user), rounded composer with paperclip attach menu, attachment chips
   (Enter to send, Shift+Enter for newline). With `readOnly` (archived chat)
-  the composer and share button are replaced by an unarchive banner.
+  the composer is replaced by an unarchive banner with a share button
+  (archived chats stay shareable, but an archived public chat cannot go
+  private again — `DELETE …/share` answers 403 until unarchived).
 - `dialogs.tsx` — `ConvEditDialog` (title + topic), `ShareModal` (public link,
   copy, unshare), `SettingsModal` (display name, avatar upload box with
   drag & drop, avatar URL, theme, plus an "Archived chats" category to
-  view / unarchive / delete archived conversations).
+  view / unarchive / delete / share archived conversations).
 - `AdminPanel.tsx` — No-KYC account management: create (key shown once),
   regenerate (revokes sessions), edit, delete with confirm, plus server-side
   search / sort (newest, oldest, A–Z, Z–A) / email filter / pagination.
diff --git a/frontend/src/components/Chat.tsx b/frontend/src/components/Chat.tsx
index 3e5b535..803c06f 100644
--- a/frontend/src/components/Chat.tsx
+++ b/frontend/src/components/Chat.tsx
@@ -625,6 +625,15 @@ export function Chat({
               <Archive size={17} />
             </span>
             <p className="min-w-0 flex-1 text-sm opacity-70">{t("archived.readonly")}</p>
+            <button
+              type="button"
+              onClick={onShare}
+              aria-label={t("sidebar.share")}
+              title={t("sidebar.share")}
+              className="grid h-10 w-10 shrink-0 place-items-center rounded-full transition hover:bg-stone-200/70 active:scale-95 dark:hover:bg-zinc-700"
+            >
+              <Share2 size={16} className="opacity-70" />
+            </button>
             <button
               type="button"
               onClick={onUnarchive}
diff --git a/frontend/src/components/dialogs.tsx b/frontend/src/components/dialogs.tsx
index 83f6ebc..97bc074 100644
--- a/frontend/src/components/dialogs.tsx
+++ b/frontend/src/components/dialogs.tsx
@@ -1,5 +1,5 @@
 import { useEffect, useRef, useState } from "react";
-import { Archive, ArchiveRestore, Eye, Fingerprint, Globe, FileText, ImagePlus, KeyRound, Link2, Mail, Mic, Palette, Pencil, Play, Plug, ScanText, Search, Settings2, ShieldCheck, Sparkles, Square, Tag, Trash2, Unplug, User as UserIcon, Volume2, X } from "lucide-react";
+import { Archive, ArchiveRestore, Eye, Fingerprint, Globe, FileText, ImagePlus, KeyRound, Link2, Mail, Mic, Palette, Pencil, Play, Plug, ScanText, Search, Settings2, Share2, ShieldCheck, Sparkles, Square, Tag, Trash2, Unplug, User as UserIcon, Volume2, X } from "lucide-react";
 import { api, type UserProvider, type VoicePreview } from "../lib/api.ts";
 import { pushToast } from "../lib/toasts.ts";
 import { cn } from "../lib/cn.ts";
@@ -229,11 +229,18 @@ export function ShareModal({ conv, onClose }: { conv: Conversation | null; onClo
 
   async function unshare() {
     if (!conv) return;
-    await api.unshare(conv.id);
-    pushToast(t("toast.unshared"), { icon: "unshare" });
-    onClose();
+    setError("");
+    try {
+      await api.unshare(conv.id);
+      pushToast(t("toast.unshared"), { icon: "unshare" });
+      onClose();
+    } catch (err) {
+      setError(err instanceof Error ? err.message : t("dlg.reqFailed"));
+    }
   }
 
+  const archived = (conv?.archived_at ?? 0) !== 0;
+
   return (
     <Modal open={conv !== null} onClose={onClose} title={t("dlg.shareTitle")} icon={Globe}>
       {busy && <p className="flex items-center gap-2 text-sm opacity-70"><Spinner size={15} /> {t("dlg.shareCreating")}</p>}
@@ -246,8 +253,13 @@ export function ShareModal({ conv, onClose }: { conv: Conversation | null; onClo
             <span className="min-w-0 flex-1 truncate">{url}</span>
             <CopyButton text={url} />
           </div>
+          {archived && <p className="text-xs opacity-60">{t("dlg.unshareBlocked")}</p>}
           <div className="flex justify-between">
-            <Button variant="ghost" size="sm" onClick={unshare}><Unplug size={15} /> {t("dlg.unshare")}</Button>
+            {!archived ? (
+              <Button variant="ghost" size="sm" onClick={unshare}><Unplug size={15} /> {t("dlg.unshare")}</Button>
+            ) : (
+              <span />
+            )}
             <Button size="sm" onClick={onClose}>{t("common.done")}</Button>
           </div>
         </div>
@@ -651,6 +663,7 @@ function ArchivedSection({ onView, onChanged }: { onView: (c: Conversation) => v
   const [error, setError] = useState("");
   const [busyId, setBusyId] = useState<string | null>(null);
   const [deleteTarget, setDeleteTarget] = useState<Conversation | null>(null);
+  const [shareTarget, setShareTarget] = useState<Conversation | null>(null);
 
   async function refresh() {
     try {
@@ -738,6 +751,16 @@ function ArchivedSection({ onView, onChanged }: { onView: (c: Conversation) => v
                 >
                   <ArchiveRestore size={15} />
                 </button>
+                <button
+                  type="button"
+                  title={t("sidebar.share")}
+                  aria-label={`${t("sidebar.share")}: ${c.title}`}
+                  disabled={busyId === c.id}
+                  onClick={() => setShareTarget(c)}
+                  className="rounded-full p-2 transition hover:bg-stone-100 disabled:opacity-50 dark:hover:bg-zinc-800"
+                >
+                  <Share2 size={15} />
+                </button>
                 <button
                   type="button"
                   title={t("common.delete")}
@@ -753,6 +776,7 @@ function ArchivedSection({ onView, onChanged }: { onView: (c: Conversation) => v
           ))}
         </ul>
       )}
+      <ShareModal conv={shareTarget} onClose={() => setShareTarget(null)} />
       <ConfirmDialog
         open={deleteTarget !== null}
         onClose={() => setDeleteTarget(null)}
diff --git a/frontend/src/lib/i18n.ts b/frontend/src/lib/i18n.ts
index 5488294..5a9e5bb 100644
--- a/frontend/src/lib/i18n.ts
+++ b/frontend/src/lib/i18n.ts
@@ -160,6 +160,7 @@ const en = {
   "dlg.shareIntro":
     "Anyone with this link can read {title}. No login required.",
   "dlg.unshare": "Unshare",
+  "dlg.unshareBlocked": "Archived chats stay public — unarchive first to remove the link.",
   "dlg.reviewOcr": "Review transcription",
   "dlg.reviewText": "Review text attachment",
   "dlg.transcribing": "Transcribing the image on the server (OCR)…",
@@ -881,6 +882,7 @@ const es: Dict = {
   "dlg.shareCreating": "Creando enlace público…",
   "dlg.shareIntro": "Cualquiera con este enlace puede leer {title}. Sin login.",
   "dlg.unshare": "Dejar de compartir",
+  "dlg.unshareBlocked": "Archived chats stay public — unarchive first to remove the link.",
   "dlg.reviewOcr": "Revisar transcripción",
   "dlg.reviewText": "Revisar adjunto de texto",
   "dlg.transcribing": "Transcribiendo la imagen en el servidor (OCR)…",
@@ -1598,6 +1600,7 @@ const fr: Dict = {
   "dlg.shareCreating": "Création du lien public…",
   "dlg.shareIntro": "Quiconque a ce lien peut lire {title}. Sans connexion.",
   "dlg.unshare": "Ne plus partager",
+  "dlg.unshareBlocked": "Archived chats stay public — unarchive first to remove the link.",
   "dlg.reviewOcr": "Relire la transcription",
   "dlg.reviewText": "Relire la pièce jointe",
   "dlg.transcribing": "Transcription de l'image sur le serveur (OCR)…",
@@ -2309,6 +2312,7 @@ const ru: Dict = {
   "dlg.shareCreating": "Создаём публичную ссылку…",
   "dlg.shareIntro": "Каждый с этой ссылкой прочитает {title}. Вход не нужен.",
   "dlg.unshare": "Закрыть доступ",
+  "dlg.unshareBlocked": "Archived chats stay public — unarchive first to remove the link.",
   "dlg.reviewOcr": "Проверить распознавание",
   "dlg.reviewText": "Проверить вложение",
   "dlg.transcribing": "Распознаём изображение на сервере (OCR)…",
@@ -3011,6 +3015,7 @@ const it: Dict = {
   "dlg.shareIntro":
     "Chiunque abbia questo link può leggere {title}. Senza login.",
   "dlg.unshare": "Rimuovi condivisione",
+  "dlg.unshareBlocked": "Archived chats stay public — unarchive first to remove the link.",
   "dlg.reviewOcr": "Rivedi trascrizione",
   "dlg.reviewText": "Rivedi allegato",
   "dlg.transcribing": "Trascrizione immagine sul server (OCR)…",
@@ -3717,6 +3722,7 @@ const pt: Dict = {
   "dlg.shareCreating": "A criar link público…",
   "dlg.shareIntro": "Quem tiver este link pode ler {title}. Sem login.",
   "dlg.unshare": "Remover partilha",
+  "dlg.unshareBlocked": "Archived chats stay public — unarchive first to remove the link.",
   "dlg.reviewOcr": "Rever transcrição",
   "dlg.reviewText": "Rever anexo",
   "dlg.transcribing": "A transcrever imagem no servidor (OCR)…",
diff --git a/src/index.ts b/src/index.ts
index 4766493..289f8f8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1751,6 +1751,8 @@ const server = Bun.serve<{ ticketId: string | null; isAdmin: boolean }>({
             return publicId ? json({ publicId, url: `/share/${publicId}` }) : json({ shared: false });
           }
           if (req.method === "DELETE") {
+            // Archived public chats stay public: unarchive first to go private.
+            if (conv.archived_at) return json({ error: "conversation is archived (read-only) — unarchive it to remove the public link" }, 403);
             await deleteShare(conv.id);
             return json({ ok: true });
           }