diff --git a/lightningbeam-ui/lightningbeam-core/src/export.rs b/lightningbeam-ui/lightningbeam-core/src/export.rs
index 21b9d46..6e62d50 100644
--- a/lightningbeam-ui/lightningbeam-core/src/export.rs
+++ b/lightningbeam-ui/lightningbeam-core/src/export.rs
@@ -524,11 +524,14 @@ pub struct ImageExportSettings {
     /// When false, the image is composited onto an opaque background before encoding.
     /// Only meaningful for formats that support alpha (PNG, WebP).
     pub allow_transparency: bool,
+    /// How the document is fit into the output frame when aspect ratios differ (default Letterbox).
+    #[serde(default)]
+    pub fit: ExportFitMode,
 }
 
 impl Default for ImageExportSettings {
     fn default() -> Self {
-        Self { format: ImageFormat::Png, time: 0.0, width: None, height: None, quality: 90, allow_transparency: false }
+        Self { format: ImageFormat::Png, time: 0.0, width: None, height: None, quality: 90, allow_transparency: false, fit: ExportFitMode::Letterbox }
     }
 }
 
diff --git a/lightningbeam-ui/lightningbeam-editor/src/export/dialog.rs b/lightningbeam-ui/lightningbeam-editor/src/export/dialog.rs
index 65e4f2b..ec716d7 100644
--- a/lightningbeam-ui/lightningbeam-editor/src/export/dialog.rs
+++ b/lightningbeam-ui/lightningbeam-editor/src/export/dialog.rs
@@ -378,6 +378,19 @@ impl ExportDialog {
             if changed_h { self.image_settings.height = if h == 0 { None } else { Some(h) }; }
             ui.weak("(0 = document size)");
         });
+
+        // Fit mode — how the document maps into the output frame when aspect ratios differ.
+        ui.horizontal(|ui| {
+            use lightningbeam_core::export::ExportFitMode;
+            ui.label("Fit:");
+            egui::ComboBox::from_id_salt("image_fit_mode")
+                .selected_text(self.image_settings.fit.name())
+                .show_ui(ui, |ui| {
+                    ui.selectable_value(&mut self.image_settings.fit, ExportFitMode::Letterbox, ExportFitMode::Letterbox.name());
+                    ui.selectable_value(&mut self.image_settings.fit, ExportFitMode::Crop, ExportFitMode::Crop.name());
+                    ui.selectable_value(&mut self.image_settings.fit, ExportFitMode::Stretch, ExportFitMode::Stretch.name());
+                });
+        });
     }
 
     /// Render advanced audio settings (sample rate, channels, bit depth, bitrate, time range)
diff --git a/lightningbeam-ui/lightningbeam-editor/src/export/mod.rs b/lightningbeam-ui/lightningbeam-editor/src/export/mod.rs
index 9c62936..7b7a7fc 100644
--- a/lightningbeam-ui/lightningbeam-editor/src/export/mod.rs
+++ b/lightningbeam-ui/lightningbeam-editor/src/export/mod.rs
@@ -598,6 +598,7 @@ impl ExportOrchestrator {
             // ── First call: render the frame to the GPU output texture ────────
             let w = state.width;
             let h = state.height;
+            let fit = state.settings.fit;
 
             if state.gpu_resources.is_none() {
                 state.gpu_resources = Some(video_exporter::ExportGpuResources::new(device, w, h));
@@ -632,8 +633,7 @@ impl ExportOrchestrator {
                 state.settings.allow_transparency,
                 raster_store,
                 true, // image export composites on the shared device
-                // Image export renders at the document's own size, so the fit transform is identity.
-                lightningbeam_core::export::ExportFitMode::Letterbox,
+                fit,
             )?;
             queue.submit(Some(encoder.finish()));