diff --git a/src/convertor/service.go b/src/convertor/service.go
index bb313fa..56e1b8d 100644
--- a/src/convertor/service.go
+++ b/src/convertor/service.go
@@ -17,6 +17,7 @@ type ServiceContract interface {
 	GetFFprobeVersion() (string, error)
 	ChangeFFmpegPath(path string) (bool, error)
 	ChangeFFprobePath(path string) (bool, error)
+	GetRunningProcesses() map[int]*exec.Cmd
 }
 
 type ProgressContract interface {
@@ -29,8 +30,14 @@ type FFPathUtilities struct {
 	FFprobe string
 }
 
+type runningProcesses struct {
+	items          map[int]*exec.Cmd
+	numberOfStarts int
+}
+
 type Service struct {
-	ffPathUtilities *FFPathUtilities
+	ffPathUtilities  *FFPathUtilities
+	runningProcesses runningProcesses
 }
 
 type File struct {
@@ -51,7 +58,8 @@ type ConvertData struct {
 
 func NewService(ffPathUtilities FFPathUtilities) *Service {
 	return &Service{
-		ffPathUtilities: &ffPathUtilities,
+		ffPathUtilities:  &ffPathUtilities,
+		runningProcesses: runningProcesses{items: map[int]*exec.Cmd{}, numberOfStarts: 0},
 	}
 }
 
@@ -77,10 +85,14 @@ func (s Service) RunConvert(setting ConvertSetting, progress ProgressContract) e
 	if err != nil {
 		return err
 	}
+	index := s.runningProcesses.numberOfStarts
+	s.runningProcesses.numberOfStarts++
+	s.runningProcesses.items[index] = cmd
 
 	errProgress := progress.Run(stdOut, stdErr)
 
 	err = cmd.Wait()
+	delete(s.runningProcesses.items, index)
 	if errProgress != nil {
 		return errProgress
 	}
@@ -155,3 +167,7 @@ func (s Service) ChangeFFprobePath(path string) (bool, error) {
 	s.ffPathUtilities.FFprobe = path
 	return true, nil
 }
+
+func (s Service) GetRunningProcesses() map[int]*exec.Cmd {
+	return s.runningProcesses.items
+}
diff --git a/src/main.go b/src/main.go
index e4955c5..46aec63 100644
--- a/src/main.go
+++ b/src/main.go
@@ -38,7 +38,7 @@ func main() {
 		return
 	}
 
-	defer appClose(db)
+	defer appCloseWithDb(db)
 
 	err = migration.Run(db)
 	if err != nil {
@@ -66,6 +66,7 @@ func main() {
 	convertorView := convertor.NewView(w)
 	settingView := setting.NewView(w)
 	convertorService := convertor.NewService(ffPathUtilities)
+	defer appCloseWithConvert(convertorService)
 	mainHandler := handler.NewConvertorHandler(convertorService, convertorView, settingView, settingRepository)
 
 	mainHandler.GetConvertor()
@@ -73,13 +74,19 @@ func main() {
 	w.ShowAndRun()
 }
 
-func appClose(db *gorm.DB) {
+func appCloseWithDb(db *gorm.DB) {
 	sqlDB, err := db.DB()
 	if err == nil {
 		_ = sqlDB.Close()
 	}
 }
 
+func appCloseWithConvert(convertorService convertor.ServiceContract) {
+	for _, cmd := range convertorService.GetRunningProcesses() {
+		_ = cmd.Process.Kill()
+	}
+}
+
 func canCreateFile(path string) bool {
 	file, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0666)
 	if err != nil {