diff --git a/include/gtklock.h b/include/gtklock.h
index 64c2f72..f427df1 100644
--- a/include/gtklock.h
+++ b/include/gtklock.h
@@ -39,6 +39,8 @@ struct GtkLock {
 	char *unlock_command;
 
 	GArray *modules;
+
+	gboolean test_mode;
 };
 
 void gtklock_remove_window(struct GtkLock *gtklock, struct Window *win);
diff --git a/src/source.c b/src/source.c
index ad2ac22..e5724dc 100644
--- a/src/source.c
+++ b/src/source.c
@@ -40,6 +40,7 @@ static gboolean should_daemonize = FALSE;
 static gboolean follow_focus = FALSE;
 static gboolean idle_hide = FALSE;
 static gboolean start_hidden = FALSE;
+static gboolean test_mode = FALSE;
 
 static gint idle_timeout = 15;
 
@@ -59,6 +60,7 @@ static GOptionEntry main_entries[] = {
 	{ "version", 'v', 0, G_OPTION_ARG_NONE, &show_version, "Show version", NULL },
 	{ "config", 'c', 0, G_OPTION_ARG_FILENAME, &config_path, "Load config file", NULL },
 	{ "daemonize", 'd', 0, G_OPTION_ARG_NONE, &should_daemonize, "Detach from controlling terminal", NULL },
+	{ "preview", 'p', 0, G_OPTION_ARG_NONE, &test_mode, "Enable preview mode where any password can unlock", NULL },
 	{ NULL },
 };
 
@@ -343,6 +345,7 @@ int main(int argc, char **argv) {
 
 	gtklock->hidden = start_hidden;
 	gtklock->idle_timeout = (guint)idle_timeout;
+	gtklock->test_mode = test_mode;
 
 	gtklock->follow_focus = follow_focus;
 	gtklock->use_idle_hide = idle_hide;
diff --git a/src/window.c b/src/window.c
index b5859cb..9794ee2 100644
--- a/src/window.c
+++ b/src/window.c
@@ -143,6 +143,9 @@ static gboolean window_pw_message(gpointer data) {
 }
 
 static gpointer window_pw_wait(gpointer data) {
+	if (gtklock->test_mode) {
+		g_application_quit(G_APPLICATION(gtklock->app));
+	}
 	struct Window *ctx = data;
 	const char *password = gtk_entry_get_text((GtkEntry*)ctx->input_field);
 	while(TRUE) {