diff --git a/ExcelMerge/CsvReader.cs b/ExcelMerge/CsvReader.cs
index 5f84dfe..84a77ba 100644
--- a/ExcelMerge/CsvReader.cs
+++ b/ExcelMerge/CsvReader.cs
@@ -8,8 +8,14 @@ internal class CsvReader
     {
         internal static IEnumerable<ExcelRow> Read(string path)
         {
-            using (var sr = new StreamReader(path, Encoding.UTF8))
+            using (var stream = File.OpenRead(path))
             {
+                var detector = new Ude.CharsetDetector();
+                detector.Feed(stream);
+                detector.DataEnd();
+                var encoding = detector.IsDone() ? Encoding.GetEncoding(detector.Charset) : Encoding.Default;
+                stream.Position = 0;
+                var sr = new StreamReader(stream, encoding);
                 var rowIndex = 0;
                 while (!sr.EndOfStream)
                 {
@@ -22,5 +28,6 @@ internal static IEnumerable<ExcelRow> Read(string path)
                 }
             }
         }
+
     }
 }
diff --git a/ExcelMerge/ExcelMerge.csproj b/ExcelMerge/ExcelMerge.csproj
index bb3f1f4..3eb5c2b 100644
--- a/ExcelMerge/ExcelMerge.csproj
+++ b/ExcelMerge/ExcelMerge.csproj
@@ -60,6 +60,9 @@
     <Reference Include="System.Data" />
     <Reference Include="System.Net.Http" />
     <Reference Include="System.Xml" />
+    <Reference Include="Ude.NetStandard, Version=1.0.2.0, Culture=neutral, PublicKeyToken=103cb45fc06c90e4, processorArchitecture=MSIL">
+      <HintPath>..\packages\Ude.NetStandard.1.2.0\lib\net45\Ude.NetStandard.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="CsvReader.cs" />
diff --git a/ExcelMerge/TsvReader.cs b/ExcelMerge/TsvReader.cs
index d490e33..d64ddfa 100644
--- a/ExcelMerge/TsvReader.cs
+++ b/ExcelMerge/TsvReader.cs
@@ -8,8 +8,14 @@ public class TsvReader
     {
         internal static IEnumerable<ExcelRow> Read(string path)
         {
-            using (var sr = new StreamReader(path, Encoding.UTF8))
+            using (var stream = File.OpenRead(path))
             {
+                var detector = new Ude.CharsetDetector();
+                detector.Feed(stream);
+                detector.DataEnd();
+                var encoding = detector.IsDone() ? Encoding.GetEncoding(detector.Charset) : Encoding.Default;
+                stream.Position = 0;
+                var sr = new StreamReader(stream, encoding);
                 var rowIndex = 0;
                 while (!sr.EndOfStream)
                 {
diff --git a/ExcelMerge/packages.config b/ExcelMerge/packages.config
index 74b655d..18044b2 100644
--- a/ExcelMerge/packages.config
+++ b/ExcelMerge/packages.config
@@ -3,4 +3,5 @@
   <package id="Diff4Net" version="1.1.2" targetFramework="net452" />
   <package id="NPOI" version="2.3.0" targetFramework="net452" />
   <package id="SharpZipLib" version="0.86.0" targetFramework="net452" />
+  <package id="Ude.NetStandard" version="1.2.0" targetFramework="net452" />
 </packages>
\ No newline at end of file