diff --git a/frontend/src/components/PlexPlayer.tsx b/frontend/src/components/PlexPlayer.tsx
index 94523bc8..621202ec 100644
--- a/frontend/src/components/PlexPlayer.tsx
+++ b/frontend/src/components/PlexPlayer.tsx
@@ -957,18 +957,24 @@ export default function PlexPlayer({ itemId, onClose, queue }: Props) {
       onMouseMove={wake}
       onClick={wake}
       onWheel={onWheel}
-      // Everything in the player is 25% larger for lean-back / HTPC legibility. Laid out at 80vw×80vh
-      // and scaled ×1.25 from the top-left so it fills the viewport exactly (no overflow, controls stay
-      // on-screen). We use `transform: scale` rather than `zoom` deliberately: under `zoom`, event
-      // clientX stays in CSS pixels while getBoundingClientRect returns zoomed pixels, so the seek/
-      // volume/hover math (clientX − rect.left)/rect.width breaks; with `transform` both are in the same
-      // viewport space, so that ratio stays correct. Skip buttons ride this too → +25% like everything.
+      // Windowed (pseudo-fullscreen): everything is 25% larger for lean-back / HTPC legibility. Laid
+      // out at 80vw×80vh and scaled ×1.25 from the top-left so it fills the viewport exactly (no
+      // overflow, controls stay on-screen). We use `transform: scale` rather than `zoom` deliberately:
+      // under `zoom`, event clientX stays in CSS pixels while getBoundingClientRect returns zoomed
+      // pixels, so the seek/volume/hover math (clientX − rect.left)/rect.width breaks; with `transform`
+      // both are in the same viewport space, so that ratio stays correct. Skip buttons ride this too.
+      //
+      // In NATIVE fullscreen we must NOT carry the ×1.25 transform: with the element at 80vw×80vh, the
+      // scaled layer is composited letterboxed and the video never grows past its windowed size (the UA
+      // does NOT force this fixed, explicitly-sized element to fill). So in `fs` we size the wrapper to
+      // the full screen (100vw×100vh) with NO transform — the flex box then centres the video and its
+      // `max-h-full`/`max-w-full` aspect-fit fills the available height. The % seek-bar left and the
+      // clientX/rect math stay correct under the identity transform.
       style={{
         cursor: uiVisible ? "default" : "none",
-        width: "80vw",
-        height: "80vh",
-        transform: "scale(1.25)",
-        transformOrigin: "top left",
+        ...(fs
+          ? { width: "100vw", height: "100vh" }
+          : { width: "80vw", height: "80vh", transform: "scale(1.25)", transformOrigin: "top left" }),
       }}
     >
       {/* Per-user subtitle appearance (font size / colour / background). ::cue is global, but this
@@ -979,7 +985,10 @@ export default function PlexPlayer({ itemId, onClose, queue }: Props) {
       )}}`}</style>
       <video
         ref={videoRef}
-        className="max-h-full max-w-full w-auto h-auto"
+        // Fill the wrapper (which is sized to the viewport / screen) and letterbox by aspect via
+        // object-contain. NOT `w-auto h-auto max-*`: that caps the video at its intrinsic resolution
+        // (a 720p stream → 1280×720) and never scales it UP, so in fullscreen it sat tiny and centred.
+        className="w-full h-full object-contain"
         onClick={togglePlay}
         playsInline
       >