diff --git a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/TextViewerPanel.cs b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/TextViewerPanel.cs
index 327bdd2..f139f65 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/TextViewerPanel.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/TextViewerPanel.cs
@@ -19,6 +19,7 @@ using System;
 using System.IO;
 using System.Text;
 using System.Threading.Tasks;
+using System.Windows.Controls;
 using System.Windows.Input;
 using System.Windows.Media;
 using System.Windows.Threading;
@@ -50,6 +51,12 @@ namespace QuickLook.Plugin.TextViewer
             Options.EnableEmailHyperlinks = false;
             Options.EnableHyperlinks = false;
 
+            ContextMenu = new ContextMenu();
+            ContextMenu.Items.Add(new MenuItem
+                {Header = TranslationHelper.Get("Editor_Copy"), Command = ApplicationCommands.Copy});
+            ContextMenu.Items.Add(new MenuItem
+                {Header = TranslationHelper.Get("Editor_SelectAll"), Command = ApplicationCommands.SelectAll});
+
             ManipulationInertiaStarting += Viewer_ManipulationInertiaStarting;
             ManipulationStarting += Viewer_ManipulationStarting;
             ManipulationDelta += Viewer_ManipulationDelta;
@@ -124,7 +131,7 @@ namespace QuickLook.Plugin.TextViewer
         {
             Task.Run(() =>
             {
-                const int maxLength = 50 * 1024 * 1024;
+                const int maxLength = 5 * 1024 * 1024;
                 var buffer = new MemoryStream();
                 bool tooLong;
 
@@ -146,7 +153,7 @@ namespace QuickLook.Plugin.TextViewer
                     return;
 
                 if (tooLong)
-                    _context.Title += " (0 ~ 50MB)";
+                    _context.Title += " (0 ~ 5MB)";
 
                 var bufferCopy = buffer.ToArray();
                 buffer.Dispose();
diff --git a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Translations.config b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Translations.config
index 9ec2391..83518cf 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Translations.config
+++ b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Translations.config
@@ -9,6 +9,8 @@
   </de-DE>
   <en>
     <Editor_FontFamily>Consolas</Editor_FontFamily>
+    <Editor_Copy>Copy</Editor_Copy>
+    <Editor_SelectAll>Select All</Editor_SelectAll>
   </en>
   <es-ES>
     <Editor_FontFamily>Consolas</Editor_FontFamily>
@@ -21,6 +23,8 @@
   </it>
   <ja-JP>
     <Editor_FontFamily>Consolas,Meiryo UI,MS UI Gothic,MS Gothic</Editor_FontFamily>
+    <Editor_Copy>コピー</Editor_Copy>
+    <Editor_SelectAll>すべて選択</Editor_SelectAll>
   </ja-JP>
   <ko-KR>
     <Editor_FontFamily>Consolas,Malgun Gothic,Batang</Editor_FontFamily>
@@ -54,9 +58,13 @@
   </vi>
   <zh-CN>
     <Editor_FontFamily>Consolas,Microsoft Yahei UI,Microsoft Yahei,SimSun</Editor_FontFamily>
+    <Editor_Copy>复制</Editor_Copy>
+    <Editor_SelectAll>全选</Editor_SelectAll>
   </zh-CN>
   <zh-TW>
     <Editor_FontFamily>Consolas,Microsoft JhengHei UI,Microsoft JhengHei,MingLiU</Editor_FontFamily>
+    <Editor_Copy>複製</Editor_Copy>
+    <Editor_SelectAll>全選</Editor_SelectAll>
   </zh-TW>
   <mr>
     <Editor_FontFamily>Consolas,Mangal,Nirmala UI</Editor_FontFamily>