diff --git a/crates/qbz-i18n/translations/de/LC_MESSAGES/qbz-ui.po b/crates/qbz-i18n/translations/de/LC_MESSAGES/qbz-ui.po
index 9350ec72b..7b63a7d54 100644
--- a/crates/qbz-i18n/translations/de/LC_MESSAGES/qbz-ui.po
+++ b/crates/qbz-i18n/translations/de/LC_MESSAGES/qbz-ui.po
@@ -7723,3 +7723,11 @@ msgstr "System-Hintergrundbild"
 #: crates/qbz-qt/qml/views/PlaylistView.qml
 msgid "{} tracks will be removed from this playlist."
 msgstr "{} Titel werden aus dieser Playlist entfernt."
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "Wallpaper blur"
+msgstr "Unschärfe des Hintergrundbilds"
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "How much the wallpaper behind the window is blurred: 0% keeps it sharp, 100% is the strongest blur."
+msgstr "Wie stark das Hintergrundbild hinter dem Fenster weichgezeichnet wird: 0 % lässt es scharf, 100 % ist die stärkste Unschärfe."
diff --git a/crates/qbz-i18n/translations/en/LC_MESSAGES/qbz-ui.po b/crates/qbz-i18n/translations/en/LC_MESSAGES/qbz-ui.po
index 89d4a7dfb..4a98d92cb 100644
--- a/crates/qbz-i18n/translations/en/LC_MESSAGES/qbz-ui.po
+++ b/crates/qbz-i18n/translations/en/LC_MESSAGES/qbz-ui.po
@@ -3378,3 +3378,11 @@ msgstr "System wallpaper"
 #: crates/qbz-qt/qml/views/PlaylistView.qml
 msgid "{} tracks will be removed from this playlist."
 msgstr "{} tracks will be removed from this playlist."
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "Wallpaper blur"
+msgstr "Wallpaper blur"
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "How much the wallpaper behind the window is blurred: 0% keeps it sharp, 100% is the strongest blur."
+msgstr "How much the wallpaper behind the window is blurred: 0% keeps it sharp, 100% is the strongest blur."
diff --git a/crates/qbz-i18n/translations/es/LC_MESSAGES/qbz-ui.po b/crates/qbz-i18n/translations/es/LC_MESSAGES/qbz-ui.po
index 71487a0ae..42d63a1ba 100644
--- a/crates/qbz-i18n/translations/es/LC_MESSAGES/qbz-ui.po
+++ b/crates/qbz-i18n/translations/es/LC_MESSAGES/qbz-ui.po
@@ -7729,3 +7729,11 @@ msgstr "Fondo del sistema"
 #: crates/qbz-qt/qml/views/PlaylistView.qml
 msgid "{} tracks will be removed from this playlist."
 msgstr "Se quitarán {} pistas de esta playlist."
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "Wallpaper blur"
+msgstr "Desenfoque del fondo de pantalla"
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "How much the wallpaper behind the window is blurred: 0% keeps it sharp, 100% is the strongest blur."
+msgstr "Qué tan desenfocado se ve el fondo de pantalla detrás de la ventana: 0 % lo deja nítido y 100 % es el desenfoque máximo."
diff --git a/crates/qbz-i18n/translations/fr/LC_MESSAGES/qbz-ui.po b/crates/qbz-i18n/translations/fr/LC_MESSAGES/qbz-ui.po
index cf8555f94..fd06ad2be 100644
--- a/crates/qbz-i18n/translations/fr/LC_MESSAGES/qbz-ui.po
+++ b/crates/qbz-i18n/translations/fr/LC_MESSAGES/qbz-ui.po
@@ -7721,3 +7721,11 @@ msgstr "Fond d'écran du système"
 #: crates/qbz-qt/qml/views/PlaylistView.qml
 msgid "{} tracks will be removed from this playlist."
 msgstr "{} titres seront retirés de cette playlist."
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "Wallpaper blur"
+msgstr "Flou du fond d'écran"
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "How much the wallpaper behind the window is blurred: 0% keeps it sharp, 100% is the strongest blur."
+msgstr "Intensité du flou du fond d'écran derrière la fenêtre : 0 % le laisse net, 100 % est le flou maximal."
diff --git a/crates/qbz-i18n/translations/ja/LC_MESSAGES/qbz-ui.po b/crates/qbz-i18n/translations/ja/LC_MESSAGES/qbz-ui.po
index 1ff5a9aaf..c9ce5e137 100644
--- a/crates/qbz-i18n/translations/ja/LC_MESSAGES/qbz-ui.po
+++ b/crates/qbz-i18n/translations/ja/LC_MESSAGES/qbz-ui.po
@@ -7704,3 +7704,11 @@ msgstr "システムの壁紙"
 #: crates/qbz-qt/qml/views/PlaylistView.qml
 msgid "{} tracks will be removed from this playlist."
 msgstr "{} 曲をこのプレイリストから削除します。"
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "Wallpaper blur"
+msgstr "壁紙のぼかし"
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "How much the wallpaper behind the window is blurred: 0% keeps it sharp, 100% is the strongest blur."
+msgstr "ウィンドウの背後に見える壁紙のぼかしの強さ。0% でくっきり、100% で最も強くぼかします。"
diff --git a/crates/qbz-i18n/translations/nl/LC_MESSAGES/qbz-ui.po b/crates/qbz-i18n/translations/nl/LC_MESSAGES/qbz-ui.po
index 442e84d83..0e1f272e1 100644
--- a/crates/qbz-i18n/translations/nl/LC_MESSAGES/qbz-ui.po
+++ b/crates/qbz-i18n/translations/nl/LC_MESSAGES/qbz-ui.po
@@ -7711,3 +7711,11 @@ msgstr "Systeemachtergrond"
 #: crates/qbz-qt/qml/views/PlaylistView.qml
 msgid "{} tracks will be removed from this playlist."
 msgstr "{} nummers worden uit deze afspeellijst verwijderd."
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "Wallpaper blur"
+msgstr "Vervaging van de bureaubladachtergrond"
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "How much the wallpaper behind the window is blurred: 0% keeps it sharp, 100% is the strongest blur."
+msgstr "Hoe sterk de bureaubladachtergrond achter het venster wordt vervaagd: 0% houdt hem scherp, 100% is de sterkste vervaging."
diff --git a/crates/qbz-i18n/translations/pt/LC_MESSAGES/qbz-ui.po b/crates/qbz-i18n/translations/pt/LC_MESSAGES/qbz-ui.po
index a862cf6c7..a119c1b52 100644
--- a/crates/qbz-i18n/translations/pt/LC_MESSAGES/qbz-ui.po
+++ b/crates/qbz-i18n/translations/pt/LC_MESSAGES/qbz-ui.po
@@ -7721,3 +7721,11 @@ msgstr "Papel de parede do sistema"
 #: crates/qbz-qt/qml/views/PlaylistView.qml
 msgid "{} tracks will be removed from this playlist."
 msgstr "{} faixas serão removidas desta playlist."
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "Wallpaper blur"
+msgstr "Desfoque do papel de parede"
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "How much the wallpaper behind the window is blurred: 0% keeps it sharp, 100% is the strongest blur."
+msgstr "Quanto o papel de parede atrás da janela fica desfocado: 0% o mantém nítido, 100% é o desfoque máximo."
diff --git a/crates/qbz-i18n/translations/ru/LC_MESSAGES/qbz-ui.po b/crates/qbz-i18n/translations/ru/LC_MESSAGES/qbz-ui.po
index e17cb65d9..23ad50f7e 100644
--- a/crates/qbz-i18n/translations/ru/LC_MESSAGES/qbz-ui.po
+++ b/crates/qbz-i18n/translations/ru/LC_MESSAGES/qbz-ui.po
@@ -7742,3 +7742,11 @@ msgstr "Обои системы"
 #: crates/qbz-qt/qml/views/PlaylistView.qml
 msgid "{} tracks will be removed from this playlist."
 msgstr "Из этого плейлиста будет удалено {} треков."
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "Wallpaper blur"
+msgstr "Размытие обоев"
+
+#: crates/qbz-qt/qml/settings/AppearanceSettings.qml
+msgid "How much the wallpaper behind the window is blurred: 0% keeps it sharp, 100% is the strongest blur."
+msgstr "Насколько размыты обои за окном: 0 % — чётко, 100 % — максимальное размытие."
diff --git a/crates/qbz-qt/qml/settings/AppearanceSettings.qml b/crates/qbz-qt/qml/settings/AppearanceSettings.qml
index ccf086ef1..d4abbcc6d 100644
--- a/crates/qbz-qt/qml/settings/AppearanceSettings.qml
+++ b/crates/qbz-qt/qml/settings/AppearanceSettings.qml
@@ -293,6 +293,35 @@ Column {
                 }
             }
         }
+        // Wallpaper mode only: how blurred the X-ray view of the desktop is.
+        // Qt's own range for MultiEffect.blur, 0.0-1.0, shown as 0-100 %; the
+        // default is the 0.75 the mode shipped with (settings_qt.rs). The drag
+        // moves the live background; the value is stored on release.
+        SettingRow { kioskHost: root.kioskHost;
+            visible: root.backgroundIndex === 3
+            label: QbzSession.tr("Wallpaper blur", QbzSession.trRev)
+            description: QbzSession.tr("How much the wallpaper behind the window is blurred: 0% keeps it sharp, 100% is the strongest blur.", QbzSession.trRev)
+            Row {
+                spacing: 12
+                QbzSlider { kioskHost: root.kioskHost;
+                    id: wallpaperBlurSlider
+                    anchors.verticalCenter: parent.verticalCenter
+                    minimum: 0
+                    maximum: 100
+                    value: Math.round(QbzShell.wallpaperBlur * 100)
+                    onChanged: function (v) { QbzShell.wallpaperBlur = v / 100 }
+                    onReleased: function (v) { QbzBridge.settingsSlider("wallpaper-blur", v) }
+                }
+                Text {
+                    anchors.verticalCenter: parent.verticalCenter
+                    width: 40
+                    horizontalAlignment: Text.AlignRight
+                    text: wallpaperBlurSlider.value + "%"
+                    color: theme.textSecondary
+                    font.pixelSize: root.kioskHost ? theme.fontBody * 1.2 : theme.fontBody
+                }
+            }
+        }
     }
 
     SettingsSpacer { }
diff --git a/crates/qbz-qt/qml/shell/AppShell.qml b/crates/qbz-qt/qml/shell/AppShell.qml
index 885c04551..631e83573 100644
--- a/crates/qbz-qt/qml/shell/AppShell.qml
+++ b/crates/qbz-qt/qml/shell/AppShell.qml
@@ -140,7 +140,9 @@ Rectangle {
         visible: root.wallpaperModeOn
         source: root.wallpaperModeOn ? QbzShell.wallpaperUrl : ""
         hostWindow: root.hostWindow
-        blur: 0.75
+        // The user's choice (Settings > Appearance, 0-100 % of Qt's 0.0-1.0),
+        // live while that slider drags; 0.75 by default.
+        blur: QbzShell.wallpaperBlur
         dim: theme.isDark ? QbzShell.ambientDim : 0.0
     }
     Rectangle {
diff --git a/crates/qbz-qt/src/settings_qt.rs b/crates/qbz-qt/src/settings_qt.rs
index 63490f460..5943761e4 100644
--- a/crates/qbz-qt/src/settings_qt.rs
+++ b/crates/qbz-qt/src/settings_qt.rs
@@ -665,6 +665,30 @@ pub fn app_background_mode() -> i32 {
         .unwrap_or(0) as i32
 }
 
+/// The Wallpaper mode's blur, in MultiEffect's own units: Qt documents
+/// `blur` from 0.0 (no blur) to 1.0 (full blur), reached at the field's
+/// `blurMax` of 64 (shell/WallpaperField.qml). 0.75 is the look the mode
+/// shipped with and stays the default; Settings > Appearance edits it as
+/// 0-100 %.
+pub const WALLPAPER_BLUR_DEFAULT: f32 = 0.75;
+
+pub fn wallpaper_blur() -> f32 {
+    clamp_wallpaper_blur(pref_f32("wallpaper_blur", WALLPAPER_BLUR_DEFAULT))
+}
+
+/// Qt's range, whatever a hand-edited ui_prefs.json holds; NaN is the default.
+fn clamp_wallpaper_blur(value: f32) -> f32 {
+    if value.is_nan() {
+        return WALLPAPER_BLUR_DEFAULT;
+    }
+    value.clamp(0.0, 1.0)
+}
+
+/// The Settings slider's 0-100 % step as the stored Qt value.
+fn wallpaper_blur_from_percent(percent: i32) -> f32 {
+    percent.clamp(0, 100) as f32 / 100.0
+}
+
 /// Live-tuning knobs (Slint AppearanceState defaults; the QBZ_BG_* envs are
 /// the same dev knobs the Slint seeds at startup).
 pub fn ambient_dim() -> f32 {
@@ -4434,6 +4458,15 @@ pub async fn settings_select(runtime: &Arc<AppRuntime<LoggingAdapter>>, key: &st
 }
 
 pub async fn settings_slider(runtime: &Arc<AppRuntime<LoggingAdapter>>, key: &str, value: i32) {
+    if key == "wallpaper-blur" {
+        // Persisted on the slider's release; the drag itself already moved
+        // QbzShell.wallpaperBlur for the live preview.
+        let blur = wallpaper_blur_from_percent(value);
+        // Written from the whole percent as f64: an f32 widened on the way to
+        // JSON would store 0.62 as 0.6200000047683716.
+        save_pref("wallpaper_blur", serde_json::json!(f64::from(value.clamp(0, 100)) / 100.0));
+        crate::shell_bridge::ui(move |mut b| b.as_mut().set_wallpaper_blur(blur));
+    }
     if key == "buffer-seconds" {
         let seconds = value.clamp(1, 10) as u8;
         match with_audio(|s| s.set_stream_buffer_seconds(seconds)) {
@@ -4907,6 +4940,28 @@ mod local_tab_order_tests {
     }
 }
 
+#[cfg(test)]
+mod wallpaper_blur_tests {
+    use super::*;
+
+    #[test]
+    fn the_slider_percent_maps_onto_qts_blur_range() {
+        assert_eq!(wallpaper_blur_from_percent(0), 0.0);
+        assert_eq!(wallpaper_blur_from_percent(75), 0.75);
+        assert_eq!(wallpaper_blur_from_percent(100), 1.0);
+        assert_eq!(wallpaper_blur_from_percent(-20), 0.0);
+        assert_eq!(wallpaper_blur_from_percent(250), 1.0);
+    }
+
+    #[test]
+    fn a_hand_edited_value_is_held_to_qts_range() {
+        assert_eq!(clamp_wallpaper_blur(1.7), 1.0);
+        assert_eq!(clamp_wallpaper_blur(-0.2), 0.0);
+        assert_eq!(clamp_wallpaper_blur(0.4), 0.4);
+        assert_eq!(clamp_wallpaper_blur(f32::NAN), WALLPAPER_BLUR_DEFAULT);
+    }
+}
+
 #[cfg(test)]
 mod theme_fieldset_doc_tests {
     use super::*;
diff --git a/crates/qbz-qt/src/shell_bridge.rs b/crates/qbz-qt/src/shell_bridge.rs
index f03202b3f..b0fd26b36 100644
--- a/crates/qbz-qt/src/shell_bridge.rs
+++ b/crates/qbz-qt/src/shell_bridge.rs
@@ -346,6 +346,10 @@ pub mod qbz_shell {
         #[qproperty(QString, ambient_accent)]
         // Look knobs (Slint AppearanceState defaults; QBZ_BG_* env seed).
         #[qproperty(f32, ambient_dim)]
+        /// The Wallpaper mode's blur, MultiEffect units 0.0-1.0
+        /// (settings_qt::wallpaper_blur). Settings writes it while the slider
+        /// drags, for a live preview, and persists it on release.
+        #[qproperty(f32, wallpaper_blur)]
         /// Debug knob QBZ_BG_SCALE — RETIRED 2026-08-13: the ambient field
         /// renders inline now (no offscreen target to scale), and the knob
         /// measured as a non-lever anyway. Kept to avoid bridge churn.
@@ -923,6 +927,7 @@ pub struct QbzShellRust {
     ambient_secondary: QString,
     ambient_accent: QString,
     ambient_dim: f32,
+    wallpaper_blur: f32,
     ambient_scale: f32,
     viz_tick_ms: i32,
     pane_layer: bool,
@@ -1043,6 +1048,7 @@ impl Default for QbzShellRust {
             ambient_secondary: QString::from("#9632ff"),
             ambient_accent: QString::from("#3fd9c8"),
             ambient_dim: crate::settings_qt::ambient_dim(),
+            wallpaper_blur: crate::settings_qt::wallpaper_blur(),
             ambient_scale: crate::settings_qt::ambient_scale(),
             viz_tick_ms: crate::settings_qt::viz_tick_ms(),
             pane_layer: crate::settings_qt::pane_layer(),