diff --git a/src-tauri/src/commands/app_lifecycle.rs b/src-tauri/src/commands/app_lifecycle.rs
index 6b721b87..129a741a 100644
--- a/src-tauri/src/commands/app_lifecycle.rs
+++ b/src-tauri/src/commands/app_lifecycle.rs
@@ -24,3 +24,31 @@ pub fn get_debug_info(app: AppHandle) -> DebugInfo {
         proxy_enabled: settings.proxy.enabled,
     }
 }
+
+#[derive(Debug, Serialize)]
+pub struct PortableInfo {
+    pub is_portable: bool,
+    pub data_dir: Option<String>,
+    /// Whether the UI should warn that the WebView is not portable here.
+    ///
+    /// Only macOS: wry does not read `data_directory` on WKWebView, so the
+    /// session data stays under `~/Library` no matter where the app runs from.
+    /// Windows and Linux redirect it in `lib.rs`, so there is nothing to warn
+    /// about there. See issue #227.
+    pub macos_webview_notice: bool,
+}
+
+/// Reports what portable mode actually covers on this platform.
+///
+/// Reads the same environment `main.rs` publishes rather than re-detecting
+/// `portable.txt`, so there is a single source of truth for the mode.
+#[tauri::command]
+pub fn get_portable_info() -> PortableInfo {
+    let is_portable = std::env::var("OMNIGET_PORTABLE").ok().as_deref() == Some("1");
+
+    PortableInfo {
+        is_portable,
+        data_dir: std::env::var("OMNIGET_DATA_DIR").ok(),
+        macos_webview_notice: cfg!(target_os = "macos") && is_portable,
+    }
+}
diff --git a/src-tauri/src/lib.rs b/src-tauri/src/lib.rs
index 5afb5fac..e4fd8143 100644
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@@ -1007,6 +1007,7 @@ pub fn run() {
             commands::p2p::p2p_resume_send,
             commands::app_lifecycle::force_exit_app,
             commands::app_lifecycle::get_debug_info,
+            commands::app_lifecycle::get_portable_info,
         ])
         .build(tauri::generate_context!())
         .expect("error while building tauri application")
diff --git a/src/components/settings/SettingsStorage.svelte b/src/components/settings/SettingsStorage.svelte
index 90879ebf..9d1a34d8 100644
--- a/src/components/settings/SettingsStorage.svelte
+++ b/src/components/settings/SettingsStorage.svelte
@@ -25,7 +25,14 @@
     map: { media_duration_secs: number; spans: unknown[] };
   };
 
+  type PortableInfo = {
+    is_portable: boolean;
+    data_dir: string | null;
+    macos_webview_notice: boolean;
+  };
+
   let stats = $state<StoreStats | null>(null);
+  let portable = $state<PortableInfo | null>(null);
   let running = $state(false);
   let probing = $state(false);
 
@@ -58,6 +65,14 @@
     }
   }
 
+  async function loadPortable() {
+    try {
+      portable = await invoke<PortableInfo>("get_portable_info");
+    } catch {
+      portable = null;
+    }
+  }
+
   async function runDedupe() {
     const chosen = await open({
       multiple: true,
@@ -127,6 +142,7 @@
 
   $effect(() => {
     void loadStats();
+    void loadPortable();
   });
 </script>
 
@@ -134,6 +150,30 @@
   <h5 class="section-title">{$t("settings.storage.title")}</h5>
   <p class="muted">{$t("settings.storage.description")}</p>
 
+  {#if portable?.is_portable}
+    <div class="card portable-card">
+      <div class="setting-row">
+        <div class="setting-col">
+          <span class="setting-label">{$t("settings.storage.portable_label")}</span>
+          <span class="setting-path wrap">
+            {$t("settings.storage.portable_active", { dir: portable.data_dir ?? "<app>/data" })}
+          </span>
+        </div>
+      </div>
+
+      <!-- O modo portatil nao cobre o WebView no macOS, e o usuario que leva o
+           pendrive para outra maquina precisa saber disso antes, nao depois. -->
+      {#if portable.macos_webview_notice}
+        <div class="divider"></div>
+        <div class="setting-row">
+          <div class="setting-col">
+            <span class="setting-path wrap">{$t("settings.storage.portable_macos_notice")}</span>
+          </div>
+        </div>
+      {/if}
+    </div>
+  {/if}
+
   <div class="card">
     <div class="setting-row">
       <div class="setting-col">
@@ -171,3 +211,17 @@
     </div>
   </div>
 </section>
+
+<style>
+  .portable-card {
+    margin-bottom: var(--padding);
+  }
+
+  /* O caminho de dados e o aviso do macOS sao frases inteiras, nao rotulos:
+     sem isto ficam numa linha so e sao cortados. */
+  .wrap {
+    white-space: normal;
+    word-break: break-word;
+    line-height: 1.5;
+  }
+</style>
diff --git a/src/lib/i18n/el.json b/src/lib/i18n/el.json
index 7913f5a3..95eb6af9 100644
--- a/src/lib/i18n/el.json
+++ b/src/lib/i18n/el.json
@@ -857,7 +857,10 @@
       "silence_running": "Μέτρηση…",
       "pick_media": "Επιλέξτε αρχείο πολυμέσων",
       "silence_none": "Σχεδόν καθόλου σιωπή σε αυτό το αρχείο",
-      "silence_done": "Βρέθηκε σιωπή {{saved}} — ο player μπορεί να την προσπερνά"
+      "silence_done": "Βρέθηκε σιωπή {{saved}} — ο player μπορεί να την προσπερνά",
+      "portable_label": "Portable Mode",
+      "portable_active": "Portable mode is active. OmniGet's data is stored in {{dir}}.",
+      "portable_macos_notice": "On macOS the WebView still stores its session data under ~/Library, and portable mode cannot redirect it. Only OmniGet's own data is portable here — see github.com/tonhowtf/omniget/issues/227."
     },
     "dependencies": {
       "title": "Εξαρτήσεις",
diff --git a/src/lib/i18n/en.json b/src/lib/i18n/en.json
index 72880bd2..2a26699f 100644
--- a/src/lib/i18n/en.json
+++ b/src/lib/i18n/en.json
@@ -903,7 +903,10 @@
       "silence_running": "Measuring…",
       "pick_media": "Pick a media file",
       "silence_none": "Almost no silence in this file",
-      "silence_done": "{{saved}} of silence found — playback can skip it"
+      "silence_done": "{{saved}} of silence found — playback can skip it",
+      "portable_label": "Portable Mode",
+      "portable_active": "Portable mode is active. OmniGet's data is stored in {{dir}}.",
+      "portable_macos_notice": "On macOS the WebView still stores its session data under ~/Library, and portable mode cannot redirect it. Only OmniGet's own data is portable here — see github.com/tonhowtf/omniget/issues/227."
     },
     "dependencies": {
       "title": "Dependencies",
diff --git a/src/lib/i18n/es.json b/src/lib/i18n/es.json
index 0f725cf2..168fbd1a 100644
--- a/src/lib/i18n/es.json
+++ b/src/lib/i18n/es.json
@@ -857,7 +857,10 @@
       "silence_running": "Midiendo…",
       "pick_media": "Elige un archivo multimedia",
       "silence_none": "Casi no hay silencio en este archivo",
-      "silence_done": "{{saved}} de silencio encontrado: el reproductor puede saltarlo"
+      "silence_done": "{{saved}} de silencio encontrado: el reproductor puede saltarlo",
+      "portable_label": "Portable Mode",
+      "portable_active": "Portable mode is active. OmniGet's data is stored in {{dir}}.",
+      "portable_macos_notice": "On macOS the WebView still stores its session data under ~/Library, and portable mode cannot redirect it. Only OmniGet's own data is portable here — see github.com/tonhowtf/omniget/issues/227."
     },
     "dependencies": {
       "title": "Dependencias",
diff --git a/src/lib/i18n/fr.json b/src/lib/i18n/fr.json
index 004340e3..f3546460 100644
--- a/src/lib/i18n/fr.json
+++ b/src/lib/i18n/fr.json
@@ -857,7 +857,10 @@
       "silence_running": "Mesure en cours…",
       "pick_media": "Choisissez un fichier multimédia",
       "silence_none": "Presque aucun silence dans ce fichier",
-      "silence_done": "{{saved}} de silence trouvé — le lecteur peut le sauter"
+      "silence_done": "{{saved}} de silence trouvé — le lecteur peut le sauter",
+      "portable_label": "Portable Mode",
+      "portable_active": "Portable mode is active. OmniGet's data is stored in {{dir}}.",
+      "portable_macos_notice": "On macOS the WebView still stores its session data under ~/Library, and portable mode cannot redirect it. Only OmniGet's own data is portable here — see github.com/tonhowtf/omniget/issues/227."
     },
     "dependencies": {
       "title": "Dépendances",
diff --git a/src/lib/i18n/it.json b/src/lib/i18n/it.json
index 1bdd0602..e66b174c 100644
--- a/src/lib/i18n/it.json
+++ b/src/lib/i18n/it.json
@@ -857,7 +857,10 @@
       "silence_running": "Misurazione…",
       "pick_media": "Scegli un file multimediale",
       "silence_none": "Quasi nessun silenzio in questo file",
-      "silence_done": "{{saved}} di silenzio trovato — il player può saltarlo"
+      "silence_done": "{{saved}} di silenzio trovato — il player può saltarlo",
+      "portable_label": "Portable Mode",
+      "portable_active": "Portable mode is active. OmniGet's data is stored in {{dir}}.",
+      "portable_macos_notice": "On macOS the WebView still stores its session data under ~/Library, and portable mode cannot redirect it. Only OmniGet's own data is portable here — see github.com/tonhowtf/omniget/issues/227."
     },
     "dependencies": {
       "title": "Dipendenze",
diff --git a/src/lib/i18n/ja.json b/src/lib/i18n/ja.json
index 803bdc63..f6e0704d 100644
--- a/src/lib/i18n/ja.json
+++ b/src/lib/i18n/ja.json
@@ -857,7 +857,10 @@
       "silence_running": "測定中…",
       "pick_media": "メディアファイルを選択",
       "silence_none": "このファイルにはほとんど無音がありません",
-      "silence_done": "無音 {{saved}} 分を検出 — 再生時にスキップできます"
+      "silence_done": "無音 {{saved}} 分を検出 — 再生時にスキップできます",
+      "portable_label": "Portable Mode",
+      "portable_active": "Portable mode is active. OmniGet's data is stored in {{dir}}.",
+      "portable_macos_notice": "On macOS the WebView still stores its session data under ~/Library, and portable mode cannot redirect it. Only OmniGet's own data is portable here — see github.com/tonhowtf/omniget/issues/227."
     },
     "dependencies": {
       "title": "依存関係",
diff --git a/src/lib/i18n/keys.ts b/src/lib/i18n/keys.ts
index 40f23dc5..3e286846 100644
--- a/src/lib/i18n/keys.ts
+++ b/src/lib/i18n/keys.ts
@@ -1555,6 +1555,9 @@ export type TranslationKeys =
   | 'settings.storage.description'
   | 'settings.storage.pick_files'
   | 'settings.storage.pick_media'
+  | 'settings.storage.portable_active'
+  | 'settings.storage.portable_label'
+  | 'settings.storage.portable_macos_notice'
   | 'settings.storage.silence_action'
   | 'settings.storage.silence_done'
   | 'settings.storage.silence_hint'
diff --git a/src/lib/i18n/pt.json b/src/lib/i18n/pt.json
index a66bb712..4d6f3735 100644
--- a/src/lib/i18n/pt.json
+++ b/src/lib/i18n/pt.json
@@ -857,7 +857,10 @@
       "silence_running": "Medindo…",
       "pick_media": "Escolha um arquivo de mídia",
       "silence_none": "Quase nenhum silêncio neste arquivo",
-      "silence_done": "{{saved}} de silêncio encontrado — o player pode pular"
+      "silence_done": "{{saved}} de silêncio encontrado — o player pode pular",
+      "portable_label": "Portable Mode",
+      "portable_active": "Portable mode is active. OmniGet's data is stored in {{dir}}.",
+      "portable_macos_notice": "On macOS the WebView still stores its session data under ~/Library, and portable mode cannot redirect it. Only OmniGet's own data is portable here — see github.com/tonhowtf/omniget/issues/227."
     },
     "dependencies": {
       "title": "Dependências",
diff --git a/src/lib/i18n/ru.json b/src/lib/i18n/ru.json
index e037be71..00b89324 100644
--- a/src/lib/i18n/ru.json
+++ b/src/lib/i18n/ru.json
@@ -857,7 +857,10 @@
       "silence_running": "Измерение…",
       "pick_media": "Выберите медиафайл",
       "silence_none": "В этом файле почти нет пауз",
-      "silence_done": "Найдено тишины: {{saved}} — плеер может её пропускать"
+      "silence_done": "Найдено тишины: {{saved}} — плеер может её пропускать",
+      "portable_label": "Portable Mode",
+      "portable_active": "Portable mode is active. OmniGet's data is stored in {{dir}}.",
+      "portable_macos_notice": "On macOS the WebView still stores its session data under ~/Library, and portable mode cannot redirect it. Only OmniGet's own data is portable here — see github.com/tonhowtf/omniget/issues/227."
     },
     "dependencies": {
       "title": "Зависимости",
diff --git a/src/lib/i18n/zh-TW.json b/src/lib/i18n/zh-TW.json
index 6f8b7604..84c5f3e6 100644
--- a/src/lib/i18n/zh-TW.json
+++ b/src/lib/i18n/zh-TW.json
@@ -857,7 +857,10 @@
       "silence_running": "測量中…",
       "pick_media": "選擇一個媒體檔案",
       "silence_none": "這個檔案幾乎沒有靜音",
-      "silence_done": "發現 {{saved}} 的靜音 —— 播放時可以略過"
+      "silence_done": "發現 {{saved}} 的靜音 —— 播放時可以略過",
+      "portable_label": "Portable Mode",
+      "portable_active": "Portable mode is active. OmniGet's data is stored in {{dir}}.",
+      "portable_macos_notice": "On macOS the WebView still stores its session data under ~/Library, and portable mode cannot redirect it. Only OmniGet's own data is portable here — see github.com/tonhowtf/omniget/issues/227."
     },
     "dependencies": {
       "title": "相依元件",
diff --git a/src/lib/i18n/zh.json b/src/lib/i18n/zh.json
index beafcf57..38d3552a 100644
--- a/src/lib/i18n/zh.json
+++ b/src/lib/i18n/zh.json
@@ -857,7 +857,10 @@
       "silence_running": "测量中…",
       "pick_media": "选择一个媒体文件",
       "silence_none": "这个文件几乎没有静音",
-      "silence_done": "发现 {{saved}} 的静音 —— 播放时可以跳过"
+      "silence_done": "发现 {{saved}} 的静音 —— 播放时可以跳过",
+      "portable_label": "Portable Mode",
+      "portable_active": "Portable mode is active. OmniGet's data is stored in {{dir}}.",
+      "portable_macos_notice": "On macOS the WebView still stores its session data under ~/Library, and portable mode cannot redirect it. Only OmniGet's own data is portable here — see github.com/tonhowtf/omniget/issues/227."
     },
     "dependencies": {
       "title": "依赖项",