diff --git a/src/ui/windows/chat_tab.cpp b/src/ui/windows/chat_tab.cpp
index 6235e41..87f8f74 100644
--- a/src/ui/windows/chat_tab.cpp
+++ b/src/ui/windows/chat_tab.cpp
@@ -2342,6 +2342,57 @@ void RenderChatTab(App* app)
                 s_delete_cid.clear(); s_delete_name.clear();
             };
 
+            // "Delete everywhere": block locally (instant, persistent — no sync flicker) AND broadcast a
+            // self-addressed Control(del) so other devices + a fresh seed import hide it too. Carries the
+            // peer z-address as the control label so Restore can match it by address.
+            auto doDeleteEverywhere = [&]() {
+                const std::string cid = s_delete_cid, name = s_delete_name;
+                std::string peerAddr;
+                for (const auto& m : app->chatService().store().conversation(cid)) {
+                    if (!m.peer_zaddr.empty()) { peerAddr = m.peer_zaddr; break; }
+                }
+                if (!app->chatService().deleteConversation(cid, /*block=*/true)) {
+                    Notifications::instance().error(TR("chat_delete_failed"));
+                    s_show_delete_confirm = false; s_delete_cid.clear(); s_delete_name.clear();
+                    return;
+                }
+                if (app->settings()) {
+                    app->settings()->setChatBlocked(cid, name, true);
+                    app->settings()->setChatHidden(cid, false);
+                    app->settings()->save();
+                }
+                app->sendChatControl(cid, "del", peerAddr.empty() ? name : peerAddr);
+                if (s_selected_cid == cid) s_selected_cid.clear();
+                Notifications::instance().info(TR("chat_delete_everywhere_toast"));
+                s_show_delete_confirm = false; s_delete_cid.clear(); s_delete_name.clear();
+            };
+
+            // Full-width on-chain delete above the local footer, gated on a fully-synced wallet (so a
+            // conversation can't flicker in/out mid-sync while the delete signal is still catching up).
+            // Full node requires tip_known (isSynced); lite never sets it, so use its own "sync complete
+            // + at tip" signal there — otherwise the button would be permanently disabled in lite.
+            const auto& syncSt = app->state().sync;
+            const bool synced = app->isLiteBuild()
+                ? (!syncSt.syncing && syncSt.blocks > 0 && syncSt.blocks >= syncSt.headers - 2)
+                : syncSt.isSynced();
+            ImGui::PushStyleColor(ImGuiCol_Button,        ImGui::ColorConvertU32ToFloat4(material::WithAlpha(material::Error(), 205)));
+            ImGui::PushStyleColor(ImGuiCol_ButtonHovered, ImGui::ColorConvertU32ToFloat4(material::Error()));
+            ImGui::PushStyleColor(ImGuiCol_ButtonActive,  ImGui::ColorConvertU32ToFloat4(material::WithAlpha(material::Error(), 235)));
+            ImGui::PushStyleColor(ImGuiCol_Text,          ImGui::ColorConvertU32ToFloat4(material::OnError()));
+            ImGui::BeginDisabled(!synced);
+            const bool doEvery = material::TactileButton(TR("chat_delete_everywhere"),
+                                                         ImVec2(ImGui::GetContentRegionAvail().x, 0));
+            ImGui::EndDisabled();
+            ImGui::PopStyleColor(4);
+            if (doEvery) doDeleteEverywhere();
+            ImGui::Dummy(ImVec2(0, Layout::spacingXs()));
+            ImGui::PushStyleColor(ImGuiCol_Text, material::OnSurfaceMedium());
+            ImGui::PushTextWrapPos(0.0f);
+            ImGui::TextUnformatted(synced ? TR("chat_delete_everywhere_note") : TR("chat_delete_needs_sync"));
+            ImGui::PopTextWrapPos();
+            ImGui::PopStyleColor();
+            ImGui::Dummy(ImVec2(0, Layout::spacingMd()));
+
             auto textW = [&](const char* t) {
                 return ImGui::CalcTextSize(t).x + ImGui::GetStyle().FramePadding.x * 2.0f + 20.0f * dp;
             };
diff --git a/src/util/i18n.cpp b/src/util/i18n.cpp
index 884ad28..e0f46b9 100644
--- a/src/util/i18n.cpp
+++ b/src/util/i18n.cpp
@@ -312,6 +312,10 @@ void I18n::loadBuiltinEnglish()
         strings_["chat_deleted_toast"] = "Conversation deleted";
         strings_["chat_delete_failed"] = "Couldn't delete the conversation — nothing was changed.";
         strings_["chat_blocked_toast"] = "Conversation deleted & blocked";
+        strings_["chat_delete_everywhere"] = "Delete everywhere";
+        strings_["chat_delete_everywhere_note"] = "Also tells your other devices - and a future restore from your seed phrase - to hide this conversation. It sends a tiny on-chain signal (costs the usual chat fee). You can bring it back later from Restore.";
+        strings_["chat_delete_everywhere_toast"] = "Deleting everywhere - signal sent";
+        strings_["chat_delete_needs_sync"] = "Wait until the wallet is fully synced to delete everywhere.";
         strings_["chat_blocked_manage"] = "Blocked";
         strings_["chat_blocked_title"] = "Blocked conversations";
         strings_["chat_blocked_desc"] = "Blocked conversations are removed and their messages are dropped — old and new — until you unblock. Unblocking re-imports the conversation from the chain.";