diff --git a/KaitaiWriter.cs b/KaitaiWriter.cs
new file mode 100644
index 0000000..e6c2e4f
--- /dev/null
+++ b/KaitaiWriter.cs
@@ -0,0 +1,268 @@
+using System;
+using System.IO;
+
+namespace Kaitai
+{
+    /// <summary>
+    /// The base Kaitai writer which exposes an API for the Kaitai Struct framework.
+    /// It's based off a <code>BinaryWriter</code>, which is a little-endian writer.
+    /// </summary>
+    public partial class KaitaiWriter : BinaryWriter
+    {
+        #region Constructors
+
+        /// <summary>
+        /// Creates a new KaitaiWriter backed by a stream
+        /// </summary>
+        public KaitaiWriter(Stream stream) : base(stream)
+        {
+        }
+
+        ///<summary>
+        /// Creates a KaitaiWriter backed by a file
+        ///</summary>
+        public KaitaiWriter(string file) : base(File.Open(file, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Write))
+        {
+        }
+
+        static readonly bool IsLittleEndian = BitConverter.IsLittleEndian;
+
+        #endregion
+
+        #region Integer types
+
+        #region Signed
+
+        /// <summary>
+        /// Write a signed byte to the stream
+        /// </summary>
+        /// <returns></returns>
+        public void WriteS1(sbyte v)
+        {
+            Write(v);
+        }
+
+        #region Big-endian
+
+        /// <summary>
+        /// Write a signed short to the stream (big endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteS2be(short v)
+        {
+            WriteBytesNormalisedBigEndian(BitConverter.GetBytes(v));
+        }
+
+        /// <summary>
+        /// Write a signed int to the stream (big endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteS4be(int v)
+        {
+            WriteBytesNormalisedBigEndian(BitConverter.GetBytes(v));
+        }
+
+        /// <summary>
+        /// Write a signed long to the stream (big endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteS8be(long v)
+        {
+            WriteBytesNormalisedBigEndian(BitConverter.GetBytes(v));
+        }
+
+        #endregion
+
+        #region Little-endian
+
+        /// <summary>
+        /// Write a signed short to the stream (little endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteS2le(short v)
+        {
+            WriteBytesNormalisedLittleEndian(BitConverter.GetBytes(v));
+        }
+
+        /// <summary>
+        /// Write a signed int to the stream (little endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteS4le(int v)
+        {
+            WriteBytesNormalisedLittleEndian(BitConverter.GetBytes(v));
+        }
+
+        /// <summary>
+        /// Write a signed long to the stream (little endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteS8le(long v)
+        {
+            WriteBytesNormalisedLittleEndian(BitConverter.GetBytes(v));
+        }
+
+        #endregion
+
+        #endregion
+
+        #region Unsigned
+
+        /// <summary>
+        /// Write an unsigned byte to the stream
+        /// </summary>
+        /// <returns></returns>
+        public void WriteU1(byte v)
+        {
+            Write(v);
+        }
+
+        #region Big-endian
+
+        /// <summary>
+        /// Write an unsigned short to the stream (big endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteU2be(ushort v)
+        {
+            WriteBytesNormalisedBigEndian(BitConverter.GetBytes(v));
+        }
+
+        /// <summary>
+        /// Write an unsigned int to the stream (big endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteU4be(uint v)
+        {
+            WriteBytesNormalisedBigEndian(BitConverter.GetBytes(v));
+        }
+
+        /// <summary>
+        /// Write an unsigned long to the stream (big endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteU8be(ulong v)
+        {
+            WriteBytesNormalisedBigEndian(BitConverter.GetBytes(v));
+        }
+
+        #endregion
+
+        #region Little-endian
+
+        /// <summary>
+        /// Write an unsigned short to the stream (little endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteU2le(ushort v)
+        {
+            WriteBytesNormalisedLittleEndian(BitConverter.GetBytes(v));
+        }
+
+        /// <summary>
+        /// Write an unsigned int to the stream (little endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteU4le(uint v)
+        {
+            WriteBytesNormalisedLittleEndian(BitConverter.GetBytes(v));
+        }
+
+        /// <summary>
+        /// Write an unsigned long to the stream (little endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteU8le(ulong v)
+        {
+            WriteBytesNormalisedLittleEndian(BitConverter.GetBytes(v));
+        }
+
+        #endregion
+
+        #endregion
+
+        #endregion
+
+        #region Floating point types
+
+        #region Big-endian
+
+        /// <summary>
+        /// Write a single-precision floating point value to the stream (big endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteF4be(float v)
+        {
+            WriteBytesNormalisedBigEndian(BitConverter.GetBytes(v));
+        }
+
+        /// <summary>
+        /// Write a double-precision floating point value to the stream (big endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteF8be(double v)
+        {
+            WriteBytesNormalisedBigEndian(BitConverter.GetBytes(v));
+        }
+
+        #endregion
+
+        #region Little-endian
+
+        /// <summary>
+        /// Write a single-precision floating point value to the stream (little endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteF4le(float v)
+        {
+            WriteBytesNormalisedLittleEndian(BitConverter.GetBytes(v));
+        }
+
+        /// <summary>
+        /// Write a double-precision floating point value to the stream (little endian)
+        /// </summary>
+        /// <returns></returns>
+        public void WriteF8le(double v)
+        {
+            WriteBytesNormalisedLittleEndian(BitConverter.GetBytes(v));
+        }
+
+        #endregion
+
+        #endregion
+
+        #region Byte arrays
+
+        /// <summary>
+        /// Write a fixed number of bytes to the stream
+        /// </summary>
+        /// <param name="bytes">The byte array to write</param>
+        /// <returns></returns>
+        public void WriteBytes(byte[] bytes)
+        {
+            Write(bytes);
+        }
+
+        /// <summary>
+        /// Write bytes to the stream in little endian format.
+        /// </summary>
+        /// <param name="bytes">The byte array to write.</param>
+        protected void WriteBytesNormalisedLittleEndian(byte[] bytes)
+        {
+            if (!IsLittleEndian) Array.Reverse(bytes);
+            Write(bytes);
+        }
+
+        /// <summary>
+        /// Read bytes to the stream in big endian format.
+        /// </summary>
+        /// <param name="bytes">The byte array to write.</param>
+        protected void WriteBytesNormalisedBigEndian(byte[] bytes)
+        {
+            if (IsLittleEndian) Array.Reverse(bytes);
+            Write(bytes);
+        }
+
+        #endregion
+    }
+}
diff --git a/kaitai_struct_runtime_csharp.csproj b/kaitai_struct_runtime_csharp.csproj
index 1ae4432..b743bd0 100644
--- a/kaitai_struct_runtime_csharp.csproj
+++ b/kaitai_struct_runtime_csharp.csproj
@@ -32,6 +32,7 @@
     <Reference Include="System" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="KaitaiWriter.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="KaitaiStream.cs" />
     <Compile Include="KaitaiStruct.cs" />