diff --git a/Sources/DropTwo/Views/FileListView.swift b/Sources/DropTwo/Views/FileListView.swift
index 8973d6e..948a85f 100644
--- a/Sources/DropTwo/Views/FileListView.swift
+++ b/Sources/DropTwo/Views/FileListView.swift
@@ -2,6 +2,7 @@ import SwiftUI
 
 struct FileListView: View {
     @EnvironmentObject private var coordinator: ConversionCoordinator
+    @State private var previewTarget: PreviewTarget?
 
     var body: some View {
         List(coordinator.items) { item in
@@ -15,10 +16,26 @@ struct FileListView: View {
                         .foregroundStyle(item.status.needsAttention ? Color.orange : .secondary)
                 }
                 Spacer()
+                Button {
+                    previewTarget = PreviewTarget(url: item.sourceURL)
+                } label: {
+                    Image(systemName: "eye")
+                }
+                .buttonStyle(.borderless)
+                .help("Vorschau mit 4:5-Rahmen zur Framing-Kontrolle")
+
                 statusIndicator(for: item.status)
             }
             .padding(.vertical, 2)
         }
+        .sheet(item: $previewTarget) { target in
+            ReviewSheet(sourceURL: target.url)
+        }
+    }
+
+    private struct PreviewTarget: Identifiable {
+        let url: URL
+        var id: URL { url }
     }
 
     @ViewBuilder
diff --git a/Sources/DropTwo/Views/ReviewSheet.swift b/Sources/DropTwo/Views/ReviewSheet.swift
new file mode 100644
index 0000000..a336cf8
--- /dev/null
+++ b/Sources/DropTwo/Views/ReviewSheet.swift
@@ -0,0 +1,91 @@
+import AVKit
+import DropTwoCore
+import SwiftUI
+
+/// Schritt 5: 9:16-Master mit eingeblendetem 4:5-Rahmen zur Framing-Kontrolle.
+/// Scrubbar über die nativen AVKit-Kontrollen von `VideoPlayer`. Der Rahmen
+/// nutzt exakt dieselbe Geometrie wie `CropEngine.targetSize` — was hier zu
+/// sehen ist, ist tatsächlich das, was beim Crop rauskommt. Rein zur Kontrolle:
+/// der Offset ist hier noch nicht verstellbar (README, "Danach"-Liste).
+struct ReviewSheet: View {
+    let sourceURL: URL
+    @Environment(\.dismiss) private var dismiss
+
+    @State private var player: AVPlayer?
+    @State private var videoSize: CGSize?
+    @State private var loadError: String?
+
+    var body: some View {
+        VStack(spacing: 12) {
+            HStack {
+                Text(sourceURL.lastPathComponent)
+                    .font(.headline)
+                    .lineLimit(1)
+                    .truncationMode(.middle)
+                Spacer()
+                Button("Schließen") { dismiss() }
+            }
+            content
+        }
+        .padding(16)
+        .frame(minWidth: 420, minHeight: 520)
+        .task { await load() }
+    }
+
+    @ViewBuilder
+    private var content: some View {
+        if let loadError {
+            VStack(spacing: 8) {
+                Image(systemName: "exclamationmark.triangle")
+                    .font(.title)
+                Text(loadError)
+            }
+            .foregroundStyle(.secondary)
+            .frame(maxWidth: .infinity, maxHeight: .infinity)
+        } else if let player, let videoSize, videoSize.height > 0 {
+            GeometryReader { proxy in
+                ZStack {
+                    VideoPlayer(player: player)
+                    cropOverlay(sourceSize: videoSize, viewSize: proxy.size)
+                }
+            }
+            .aspectRatio(videoSize.width / videoSize.height, contentMode: .fit)
+        } else {
+            ProgressView("Lädt Vorschau …")
+                .frame(maxWidth: .infinity, maxHeight: .infinity)
+        }
+    }
+
+    /// Zwei abgedunkelte Balken oben/unten markieren, was beim Crop wegfällt;
+    /// der helle Rahmen zeigt die bleibende 4:5-Fläche — volle Breite,
+    /// vertikal zentriert, exakt wie `CropEngine` es tatsächlich schneidet.
+    @ViewBuilder
+    private func cropOverlay(sourceSize: CGSize, viewSize: CGSize) -> some View {
+        let cropSize = CropEngine.targetSize(forSourceSize: sourceSize)
+        let marginFraction = max(0, (1 - cropSize.height / sourceSize.height) / 2)
+        let marginHeight = viewSize.height * marginFraction
+
+        VStack(spacing: 0) {
+            Rectangle()
+                .fill(Color.black.opacity(0.55))
+                .frame(height: marginHeight)
+            Rectangle()
+                .strokeBorder(Color(red: 0.784, green: 0.663, blue: 0.416), lineWidth: 2)
+                .frame(height: max(viewSize.height - marginHeight * 2, 0))
+            Rectangle()
+                .fill(Color.black.opacity(0.55))
+                .frame(height: marginHeight)
+        }
+        .allowsHitTesting(false)
+    }
+
+    private func load() async {
+        do {
+            let info = try await VideoInspector.inspect(sourceURL)
+            videoSize = info.pixelSize
+            player = AVPlayer(url: sourceURL)
+        } catch {
+            loadError = "Konnte Vorschau nicht laden."
+        }
+    }
+}