diff --git a/Assets/EsnyaUnityTools/Editor/FFMpegNormalize.cs b/Assets/EsnyaUnityTools/Editor/FFMpegNormalize.cs
new file mode 100644
index 0000000..6a25785
--- /dev/null
+++ b/Assets/EsnyaUnityTools/Editor/FFMpegNormalize.cs
@@ -0,0 +1,48 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.RegularExpressions;
+using UnityEngine;
+using UnityEditor;
+
+namespace EsnyaFactory.EsnyaUnityTools {
+    public class FFMpegNormalize {
+
+        [MenuItem("Assets/EsnyaTools/Normalize (ffmpeg-normalize)", false)]
+        private static void NormalizeSelected() {
+            foreach (var c in Selection.objects.Where(o => o.GetType() == typeof(AudioClip)).Select(o => o as AudioClip)) {
+                Normalize(c);
+            }
+        }
+
+
+        [MenuItem("Assets/EsnyaTools/Normalize (ffmpeg-normalize)", true)]
+        private static bool IsNormalizeTarget() {
+            return Selection.objects.Any(o => o.GetType() == typeof(AudioClip));
+        }
+
+        private static void Normalize(AudioClip audioClip) {
+            var src = $"{new Regex("/Assets/?$").Replace(Application.dataPath, "")}/{AssetDatabase.GetAssetPath(audioClip)}";
+            var dst = $"{src}.normalized.wav";
+            var ext = "wav";
+            var nt = "peak";
+            var target = 0;
+
+            try {
+                Exec("ffmpeg-normalize", $"\"{src}\" -ext \"{ext}\" -nt \"{nt}\" -t \"{target}\" -o \"{dst}\"");
+            } catch (System.Exception e) {
+                Debug.LogError(e);
+                if (EditorUtility.DisplayDialog("Error", "ffmpeg-normalize is not installed. Do you want to install now? (Python 3.x required)", "Install", "Cancel")) {
+                    Exec("pip3", "install ffmpeg-normalize");
+                    Normalize(audioClip);
+                }
+            }
+        }
+
+        private static void Exec(string command, string arguments) {
+            Debug.Log($"{command} {arguments}");
+            var process = System.Diagnostics.Process.Start(command, arguments);
+            process.WaitForExit();
+        }
+    }
+}
diff --git a/Assets/EsnyaUnityTools/Editor/FFMpegNormalize.cs.meta b/Assets/EsnyaUnityTools/Editor/FFMpegNormalize.cs.meta
new file mode 100644
index 0000000..519410c
--- /dev/null
+++ b/Assets/EsnyaUnityTools/Editor/FFMpegNormalize.cs.meta
@@ -0,0 +1,11 @@
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