diff --git a/src/services/atracdenc-worker.ts b/src/services/atracdenc-worker.ts
index 6a86485..d632d02 100644
--- a/src/services/atracdenc-worker.ts
+++ b/src/services/atracdenc-worker.ts
@@ -22,6 +22,10 @@ export class AtracdencProcess {
         return eventData.data.result as Uint8Array;
     }
 
+    terminate() {
+        this.worker.terminate();
+    }
+
     handleMessage(ev: MessageEvent) {
         this.messageCallback!(ev);
         this.messageCallback = undefined;
@@ -65,7 +69,6 @@ if (typeof WorkerGlobalScope !== 'undefined' && self instanceof WorkerGlobalScop
                 },
                 [result]
             );
-            self.close();
         }
     };
 } else {
diff --git a/src/services/audio-export.ts b/src/services/audio-export.ts
index 75d73c7..82834c9 100644
--- a/src/services/audio-export.ts
+++ b/src/services/audio-export.ts
@@ -80,11 +80,12 @@ export class FFMpegAudioExportService implements AudioExportService {
     }
 
     async export({ format }: { format: string }) {
+        let result: ArrayBuffer;
         if (format === `SP`) {
             const outFileName = `${this.outFileNameNoExt}.raw`;
             await this.ffmpegProcess.transcode(this.inFileName, outFileName, '-f s16be -ar 44100');
             let { data } = await this.ffmpegProcess.read(outFileName);
-            return data.buffer;
+            result = data.buffer;
         } else {
             const outFileName = `${this.outFileNameNoExt}.wav`;
             await this.ffmpegProcess.transcode(this.inFileName, outFileName, '-f wav -ar 44100');
@@ -101,8 +102,10 @@ export class FFMpegAudioExportService implements AudioExportService {
                     bitrate = `64`;
                     break;
             }
-            let result = await this.atracdencProcess!.encode(data.buffer, bitrate);
-            return result;
+            result = await this.atracdencProcess!.encode(data.buffer, bitrate);
         }
+        this.ffmpegProcess.worker.terminate();
+        this.atracdencProcess!.terminate();
+        return result;
     }
 }
diff --git a/src/services/netmd.ts b/src/services/netmd.ts
index d22df29..3107fd3 100644
--- a/src/services/netmd.ts
+++ b/src/services/netmd.ts
@@ -111,6 +111,8 @@ export class NetMDUSBService implements NetMDService {
             written = writtenBytes;
             updateProgress();
         });
+
+        w.terminate();
     }
 
     async play() {