diff --git a/toonz/sources/toonz/outputsettingspopup.cpp b/toonz/sources/toonz/outputsettingspopup.cpp
index 7ed1341..973088d 100644
--- a/toonz/sources/toonz/outputsettingspopup.cpp
+++ b/toonz/sources/toonz/outputsettingspopup.cpp
@@ -37,6 +37,7 @@
 #include "tenv.h"
 #include "tsystem.h"
 #include "tstream.h"
+#include "tfiletype.h"
 
 // Qt includes
 #include <QLabel>
@@ -144,6 +145,13 @@ enum ThreadsOption {
 
 enum GranularityOption { c_off, c_large, c_medium, c_small };
 
+bool checkForSeqNum(QString type) {
+  TFileType::Type typeInfo = TFileType::getInfoFromExtension(type);
+  if ((typeInfo & TFileType::IMAGE) && !(typeInfo & TFileType::LEVEL))
+    return true;
+  else
+    return false;
+}
 }  // anonymous namespace
 //-----------------------------------------------------------------------------
 
@@ -1038,10 +1046,10 @@ void OutputSettingsPopup::onNameChanged() {
   TOutputProperties *prop = getProperties();
   TFilePath fp            = prop->getPath();
 
-  if (fp.getWideName() == wname) return;  // Already had the right name
+  TFilePath newFp = fp.withName(wname);
+  if (newFp == fp) return;  // Already had the right name
 
-  fp = fp.withName(wname);
-  prop->setPath(fp);
+  prop->setPath(newFp);
 
   TApp::instance()->getCurrentScene()->setDirtyFlag(true);
 
@@ -1060,7 +1068,11 @@ void OutputSettingsPopup::onFormatChanged(const QString &str) {
   TOutputProperties *prop = getProperties();
   bool wasMultiRenderInvalid =
       isMultiRenderInvalid(prop->getPath().getType(), m_allowMT);
-  TFilePath fp = prop->getPath().withType(str.toStdString());
+  // remove sepchar, ..
+  TFilePath fp = prop->getPath().withNoFrame().withType(str.toStdString());
+  // .. then add sepchar for sequencial image formats
+  if (checkForSeqNum(str)) fp = fp.withFrame(prop->formatTemplateFId());
+
   prop->setPath(fp);
   TApp::instance()->getCurrentScene()->setDirtyFlag(true);
   m_allowMT = Preferences::instance()->getFfmpegMultiThread();