diff --git a/src-tauri/src/commands/media_analysis.rs b/src-tauri/src/commands/media_analysis.rs
index e4dc8a5..f3f569f 100644
--- a/src-tauri/src/commands/media_analysis.rs
+++ b/src-tauri/src/commands/media_analysis.rs
@@ -51,15 +51,19 @@ pub async fn extract_waveform_tiers(
 pub async fn extract_thumbnails(
     file_path: String,
     duration: f64,
+    output_dir: Option<String>,
 ) -> Result<Vec<ThumbnailSpritesheet>, String> {
     eprintln!(
         "[video-clipper:thumbnails] starting for '{}' (duration={})",
         file_path, duration
     );
     let result = tokio::task::spawn_blocking(move || {
-        let temp_dir = std::env::temp_dir()
-            .join("video-clipper-thumbs")
-            .join(uuid::Uuid::new_v4().to_string());
+        let temp_dir = match output_dir {
+            Some(dir) => std::path::PathBuf::from(dir),
+            None => std::env::temp_dir()
+                .join("video-clipper-thumbs")
+                .join(uuid::Uuid::new_v4().to_string()),
+        };
         let temp_dir_str = temp_dir.to_string_lossy().to_string();
         thumbnail_extractor::extract_thumbnails(&file_path, duration, &temp_dir_str)
     })
diff --git a/src/lib/bindings/mediaAnalysis.ts b/src/lib/bindings/mediaAnalysis.ts
index 223a69a..bb225dc 100644
--- a/src/lib/bindings/mediaAnalysis.ts
+++ b/src/lib/bindings/mediaAnalysis.ts
@@ -41,11 +41,13 @@ export async function extractWaveformTiers(
 
 export async function extractThumbnails(
   filePath: string,
-  duration: number
+  duration: number,
+  outputDir?: string
 ): Promise<ThumbnailSpritesheet[]> {
   return invoke<ThumbnailSpritesheet[]>('extract_thumbnails', {
     filePath,
     duration,
+    outputDir: outputDir ?? null,
   });
 }