diff --git a/Source/Core/Core/CMakeLists.txt b/Source/Core/Core/CMakeLists.txt
index 892960e05c..c9a966267a 100644
--- a/Source/Core/Core/CMakeLists.txt
+++ b/Source/Core/Core/CMakeLists.txt
@@ -408,6 +408,8 @@ add_library(core
   Movie.h
   NetPlayClient.cpp
   NetPlayClient.h
+  NetPlayCommon.cpp
+  NetPlayCommon.h
   NetPlayServer.cpp
   NetPlayServer.h
   NetworkCaptureLogger.cpp
diff --git a/Source/Core/Core/NetPlayClient.cpp b/Source/Core/Core/NetPlayClient.cpp
index aaaa0bca38..dd66fe6366 100644
--- a/Source/Core/Core/NetPlayClient.cpp
+++ b/Source/Core/Core/NetPlayClient.cpp
@@ -15,7 +15,6 @@
 #include <vector>
 
 #include <fmt/format.h>
-#include <lzo/lzo1x.h>
 #include <mbedtls/md5.h>
 
 #include "Common/Assert.h"
@@ -23,7 +22,6 @@
 #include "Common/CommonTypes.h"
 #include "Common/ENetUtil.h"
 #include "Common/FileUtil.h"
-#include "Common/IOFile.h"
 #include "Common/Logging/Log.h"
 #include "Common/MD5.h"
 #include "Common/MsgHandler.h"
@@ -54,6 +52,7 @@
 #include "Core/IOS/USB/Bluetooth/BTEmu.h"
 #include "Core/IOS/Uids.h"
 #include "Core/Movie.h"
+#include "Core/NetPlayCommon.h"
 #include "Core/PowerPC/PowerPC.h"
 #include "Core/SyncIdentifier.h"
 
@@ -1635,92 +1634,6 @@ void NetPlayClient::SyncCodeResponse(const bool success)
   }
 }
 
-bool NetPlayClient::DecompressPacketIntoFile(sf::Packet& packet, const std::string& file_path)
-{
-  u64 file_size = Common::PacketReadU64(packet);
-
-  if (file_size == 0)
-    return true;
-
-  File::IOFile file(file_path, "wb");
-  if (!file)
-  {
-    PanicAlertFmtT("Failed to open file \"{0}\". Verify your write permissions.", file_path);
-    return false;
-  }
-
-  std::vector<u8> in_buffer(NETPLAY_LZO_OUT_LEN);
-  std::vector<u8> out_buffer(NETPLAY_LZO_IN_LEN);
-
-  while (true)
-  {
-    u32 cur_len = 0;       // number of bytes to read
-    lzo_uint new_len = 0;  // number of bytes to write
-
-    packet >> cur_len;
-    if (!cur_len)
-      break;  // We reached the end of the data stream
-
-    for (size_t j = 0; j < cur_len; j++)
-    {
-      packet >> in_buffer[j];
-    }
-
-    if (lzo1x_decompress(in_buffer.data(), cur_len, out_buffer.data(), &new_len, nullptr) !=
-        LZO_E_OK)
-    {
-      PanicAlertFmtT("Internal LZO Error - decompression failed");
-      return false;
-    }
-
-    if (!file.WriteBytes(out_buffer.data(), new_len))
-    {
-      PanicAlertFmtT("Error writing file: {0}", file_path);
-      return false;
-    }
-  }
-
-  return true;
-}
-
-std::optional<std::vector<u8>> NetPlayClient::DecompressPacketIntoBuffer(sf::Packet& packet)
-{
-  u64 size = Common::PacketReadU64(packet);
-
-  std::vector<u8> out_buffer(size);
-
-  if (size == 0)
-    return out_buffer;
-
-  std::vector<u8> in_buffer(NETPLAY_LZO_OUT_LEN);
-
-  lzo_uint i = 0;
-  while (true)
-  {
-    u32 cur_len = 0;       // number of bytes to read
-    lzo_uint new_len = 0;  // number of bytes to write
-
-    packet >> cur_len;
-    if (!cur_len)
-      break;  // We reached the end of the data stream
-
-    for (size_t j = 0; j < cur_len; j++)
-    {
-      packet >> in_buffer[j];
-    }
-
-    if (lzo1x_decompress(in_buffer.data(), cur_len, &out_buffer[i], &new_len, nullptr) != LZO_E_OK)
-    {
-      PanicAlertFmtT("Internal LZO Error - decompression failed");
-      return {};
-    }
-
-    i += new_len;
-  }
-
-  return out_buffer;
-}
-
 // called from ---GUI--- thread
 bool NetPlayClient::ChangeGame(const std::string&)
 {
diff --git a/Source/Core/Core/NetPlayClient.h b/Source/Core/Core/NetPlayClient.h
index 794cfe5c49..8cb2d7953e 100644
--- a/Source/Core/Core/NetPlayClient.h
+++ b/Source/Core/Core/NetPlayClient.h
@@ -9,7 +9,6 @@
 #include <map>
 #include <memory>
 #include <mutex>
-#include <optional>
 #include <string>
 #include <thread>
 #include <unordered_map>
@@ -221,8 +220,6 @@ private:
 
   void SyncSaveDataResponse(bool success);
   void SyncCodeResponse(bool success);
-  bool DecompressPacketIntoFile(sf::Packet& packet, const std::string& file_path);
-  std::optional<std::vector<u8>> DecompressPacketIntoBuffer(sf::Packet& packet);
 
   bool PollLocalPad(int local_pad, sf::Packet& packet);
   void SendPadHostPoll(PadIndex pad_num);
diff --git a/Source/Core/Core/NetPlayCommon.cpp b/Source/Core/Core/NetPlayCommon.cpp
new file mode 100644
index 0000000000..910c7308fd
--- /dev/null
+++ b/Source/Core/Core/NetPlayCommon.cpp
@@ -0,0 +1,227 @@
+// Copyright 2021 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "Core/NetPlayCommon.h"
+
+#include <lzo/lzo1x.h>
+
+#include "Common/FileUtil.h"
+#include "Common/IOFile.h"
+#include "Common/MsgHandler.h"
+#include "Common/SFMLHelper.h"
+
+namespace NetPlay
+{
+constexpr u32 LZO_IN_LEN = 1024 * 64;
+constexpr u32 LZO_OUT_LEN = LZO_IN_LEN + (LZO_IN_LEN / 16) + 64 + 3;
+
+bool CompressFileIntoPacket(const std::string& file_path, sf::Packet& packet)
+{
+  File::IOFile file(file_path, "rb");
+  if (!file)
+  {
+    PanicAlertFmtT("Failed to open file \"{0}\".", file_path);
+    return false;
+  }
+
+  const sf::Uint64 size = file.GetSize();
+  packet << size;
+
+  if (size == 0)
+    return true;
+
+  std::vector<u8> in_buffer(LZO_IN_LEN);
+  std::vector<u8> out_buffer(LZO_OUT_LEN);
+  std::vector<u8> wrkmem(LZO1X_1_MEM_COMPRESS);
+
+  lzo_uint i = 0;
+  while (true)
+  {
+    lzo_uint32 cur_len = 0;  // number of bytes to read
+    lzo_uint out_len = 0;    // number of bytes to write
+
+    if ((i + LZO_IN_LEN) >= size)
+    {
+      cur_len = static_cast<lzo_uint32>(size - i);
+    }
+    else
+    {
+      cur_len = LZO_IN_LEN;
+    }
+
+    if (cur_len <= 0)
+      break;  // EOF
+
+    if (!file.ReadBytes(in_buffer.data(), cur_len))
+    {
+      PanicAlertFmtT("Error reading file: {0}", file_path.c_str());
+      return false;
+    }
+
+    if (lzo1x_1_compress(in_buffer.data(), cur_len, out_buffer.data(), &out_len, wrkmem.data()) !=
+        LZO_E_OK)
+    {
+      PanicAlertFmtT("Internal LZO Error - compression failed");
+      return false;
+    }
+
+    // The size of the data to write is 'out_len'
+    packet << static_cast<u32>(out_len);
+    for (size_t j = 0; j < out_len; j++)
+    {
+      packet << out_buffer[j];
+    }
+
+    if (cur_len != LZO_IN_LEN)
+      break;
+
+    i += cur_len;
+  }
+
+  // Mark end of data
+  packet << static_cast<u32>(0);
+
+  return true;
+}
+
+bool CompressBufferIntoPacket(const std::vector<u8>& in_buffer, sf::Packet& packet)
+{
+  const sf::Uint64 size = in_buffer.size();
+  packet << size;
+
+  if (size == 0)
+    return true;
+
+  std::vector<u8> out_buffer(LZO_OUT_LEN);
+  std::vector<u8> wrkmem(LZO1X_1_MEM_COMPRESS);
+
+  lzo_uint i = 0;
+  while (true)
+  {
+    lzo_uint32 cur_len = 0;  // number of bytes to read
+    lzo_uint out_len = 0;    // number of bytes to write
+
+    if ((i + LZO_IN_LEN) >= size)
+    {
+      cur_len = static_cast<lzo_uint32>(size - i);
+    }
+    else
+    {
+      cur_len = LZO_IN_LEN;
+    }
+
+    if (cur_len <= 0)
+      break;  // end of buffer
+
+    if (lzo1x_1_compress(&in_buffer[i], cur_len, out_buffer.data(), &out_len, wrkmem.data()) !=
+        LZO_E_OK)
+    {
+      PanicAlertFmtT("Internal LZO Error - compression failed");
+      return false;
+    }
+
+    // The size of the data to write is 'out_len'
+    packet << static_cast<u32>(out_len);
+    for (size_t j = 0; j < out_len; j++)
+    {
+      packet << out_buffer[j];
+    }
+
+    if (cur_len != LZO_IN_LEN)
+      break;
+
+    i += cur_len;
+  }
+
+  // Mark end of data
+  packet << static_cast<u32>(0);
+
+  return true;
+}
+
+bool DecompressPacketIntoFile(sf::Packet& packet, const std::string& file_path)
+{
+  u64 file_size = Common::PacketReadU64(packet);
+
+  if (file_size == 0)
+    return true;
+
+  File::IOFile file(file_path, "wb");
+  if (!file)
+  {
+    PanicAlertFmtT("Failed to open file \"{0}\". Verify your write permissions.", file_path);
+    return false;
+  }
+
+  std::vector<u8> in_buffer(LZO_OUT_LEN);
+  std::vector<u8> out_buffer(LZO_IN_LEN);
+
+  while (true)
+  {
+    u32 cur_len = 0;       // number of bytes to read
+    lzo_uint new_len = 0;  // number of bytes to write
+
+    packet >> cur_len;
+    if (!cur_len)
+      break;  // We reached the end of the data stream
+
+    for (size_t j = 0; j < cur_len; j++)
+    {
+      packet >> in_buffer[j];
+    }
+
+    if (lzo1x_decompress(in_buffer.data(), cur_len, out_buffer.data(), &new_len, nullptr) !=
+        LZO_E_OK)
+    {
+      PanicAlertFmtT("Internal LZO Error - decompression failed");
+      return false;
+    }
+
+    if (!file.WriteBytes(out_buffer.data(), new_len))
+    {
+      PanicAlertFmtT("Error writing file: {0}", file_path);
+      return false;
+    }
+  }
+
+  return true;
+}
+
+std::optional<std::vector<u8>> DecompressPacketIntoBuffer(sf::Packet& packet)
+{
+  u64 size = Common::PacketReadU64(packet);
+
+  std::vector<u8> out_buffer(size);
+
+  if (size == 0)
+    return out_buffer;
+
+  std::vector<u8> in_buffer(LZO_OUT_LEN);
+
+  lzo_uint i = 0;
+  while (true)
+  {
+    u32 cur_len = 0;       // number of bytes to read
+    lzo_uint new_len = 0;  // number of bytes to write
+
+    packet >> cur_len;
+    if (!cur_len)
+      break;  // We reached the end of the data stream
+
+    for (size_t j = 0; j < cur_len; j++)
+    {
+      packet >> in_buffer[j];
+    }
+
+    if (lzo1x_decompress(in_buffer.data(), cur_len, &out_buffer[i], &new_len, nullptr) != LZO_E_OK)
+    {
+      PanicAlertFmtT("Internal LZO Error - decompression failed");
+      return {};
+    }
+
+    i += new_len;
+  }
+
+  return out_buffer;
+}
+}  // namespace NetPlay
diff --git a/Source/Core/Core/NetPlayCommon.h b/Source/Core/Core/NetPlayCommon.h
new file mode 100644
index 0000000000..fc2a017047
--- /dev/null
+++ b/Source/Core/Core/NetPlayCommon.h
@@ -0,0 +1,21 @@
+// Copyright 2021 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <SFML/Network/Packet.hpp>
+
+#include <array>
+#include <optional>
+#include <string>
+#include <vector>
+
+#include "Common/CommonTypes.h"
+
+namespace NetPlay
+{
+bool CompressFileIntoPacket(const std::string& file_path, sf::Packet& packet);
+bool CompressBufferIntoPacket(const std::vector<u8>& in_buffer, sf::Packet& packet);
+bool DecompressPacketIntoFile(sf::Packet& packet, const std::string& file_path);
+std::optional<std::vector<u8>> DecompressPacketIntoBuffer(sf::Packet& packet);
+}  // namespace NetPlay
diff --git a/Source/Core/Core/NetPlayProto.h b/Source/Core/Core/NetPlayProto.h
index 9c3a37d723..1b547eda80 100644
--- a/Source/Core/Core/NetPlayProto.h
+++ b/Source/Core/Core/NetPlayProto.h
@@ -117,11 +117,6 @@ struct NetTraversalConfig
   u16 traversal_port = 0;
 };
 
-struct Rpt : public std::vector<u8>
-{
-  u16 channel;
-};
-
 // messages
 enum
 {
@@ -210,13 +205,15 @@ enum
   SYNC_CODES_FAILURE = 6,
 };
 
-constexpr u32 NETPLAY_LZO_IN_LEN = 1024 * 64;
-constexpr u32 NETPLAY_LZO_OUT_LEN = NETPLAY_LZO_IN_LEN + (NETPLAY_LZO_IN_LEN / 16) + 64 + 3;
 constexpr u32 MAX_NAME_LENGTH = 30;
 constexpr size_t CHUNKED_DATA_UNIT_SIZE = 16384;
-constexpr u8 CHANNEL_COUNT = 2;
-constexpr u8 DEFAULT_CHANNEL = 0;
-constexpr u8 CHUNKED_DATA_CHANNEL = 1;
+
+enum : u8
+{
+  DEFAULT_CHANNEL,
+  CHUNKED_DATA_CHANNEL,
+  CHANNEL_COUNT
+};
 
 struct WiimoteInput
 {
diff --git a/Source/Core/Core/NetPlayServer.cpp b/Source/Core/Core/NetPlayServer.cpp
index fe50dc0399..f0dae94923 100644
--- a/Source/Core/Core/NetPlayServer.cpp
+++ b/Source/Core/Core/NetPlayServer.cpp
@@ -18,13 +18,11 @@
 #include <vector>
 
 #include <fmt/format.h>
-#include <lzo/lzo1x.h>
 
 #include "Common/CommonPaths.h"
 #include "Common/ENetUtil.h"
 #include "Common/FileUtil.h"
 #include "Common/HttpRequest.h"
-#include "Common/IOFile.h"
 #include "Common/Logging/Log.h"
 #include "Common/MsgHandler.h"
 #include "Common/SFMLHelper.h"
@@ -55,6 +53,7 @@
 #include "Core/IOS/IOS.h"
 #include "Core/IOS/Uids.h"
 #include "Core/NetPlayClient.h"  //for NetPlayUI
+#include "Core/NetPlayCommon.h"
 #include "Core/SyncIdentifier.h"
 
 #include "DiscIO/Enums.h"
@@ -1906,130 +1905,6 @@ void NetPlayServer::CheckSyncAndStartGame()
   }
 }
 
-bool NetPlayServer::CompressFileIntoPacket(const std::string& file_path, sf::Packet& packet)
-{
-  File::IOFile file(file_path, "rb");
-  if (!file)
-  {
-    PanicAlertFmtT("Failed to open file \"{0}\".", file_path);
-    return false;
-  }
-
-  const sf::Uint64 size = file.GetSize();
-  packet << size;
-
-  if (size == 0)
-    return true;
-
-  std::vector<u8> in_buffer(NETPLAY_LZO_IN_LEN);
-  std::vector<u8> out_buffer(NETPLAY_LZO_OUT_LEN);
-  std::vector<u8> wrkmem(LZO1X_1_MEM_COMPRESS);
-
-  lzo_uint i = 0;
-  while (true)
-  {
-    lzo_uint32 cur_len = 0;  // number of bytes to read
-    lzo_uint out_len = 0;    // number of bytes to write
-
-    if ((i + NETPLAY_LZO_IN_LEN) >= size)
-    {
-      cur_len = static_cast<lzo_uint32>(size - i);
-    }
-    else
-    {
-      cur_len = NETPLAY_LZO_IN_LEN;
-    }
-
-    if (cur_len <= 0)
-      break;  // EOF
-
-    if (!file.ReadBytes(in_buffer.data(), cur_len))
-    {
-      PanicAlertFmtT("Error reading file: {0}", file_path.c_str());
-      return false;
-    }
-
-    if (lzo1x_1_compress(in_buffer.data(), cur_len, out_buffer.data(), &out_len, wrkmem.data()) !=
-        LZO_E_OK)
-    {
-      PanicAlertFmtT("Internal LZO Error - compression failed");
-      return false;
-    }
-
-    // The size of the data to write is 'out_len'
-    packet << static_cast<u32>(out_len);
-    for (size_t j = 0; j < out_len; j++)
-    {
-      packet << out_buffer[j];
-    }
-
-    if (cur_len != NETPLAY_LZO_IN_LEN)
-      break;
-
-    i += cur_len;
-  }
-
-  // Mark end of data
-  packet << static_cast<u32>(0);
-
-  return true;
-}
-
-bool NetPlayServer::CompressBufferIntoPacket(const std::vector<u8>& in_buffer, sf::Packet& packet)
-{
-  const sf::Uint64 size = in_buffer.size();
-  packet << size;
-
-  if (size == 0)
-    return true;
-
-  std::vector<u8> out_buffer(NETPLAY_LZO_OUT_LEN);
-  std::vector<u8> wrkmem(LZO1X_1_MEM_COMPRESS);
-
-  lzo_uint i = 0;
-  while (true)
-  {
-    lzo_uint32 cur_len = 0;  // number of bytes to read
-    lzo_uint out_len = 0;    // number of bytes to write
-
-    if ((i + NETPLAY_LZO_IN_LEN) >= size)
-    {
-      cur_len = static_cast<lzo_uint32>(size - i);
-    }
-    else
-    {
-      cur_len = NETPLAY_LZO_IN_LEN;
-    }
-
-    if (cur_len <= 0)
-      break;  // end of buffer
-
-    if (lzo1x_1_compress(&in_buffer[i], cur_len, out_buffer.data(), &out_len, wrkmem.data()) !=
-        LZO_E_OK)
-    {
-      PanicAlertFmtT("Internal LZO Error - compression failed");
-      return false;
-    }
-
-    // The size of the data to write is 'out_len'
-    packet << static_cast<u32>(out_len);
-    for (size_t j = 0; j < out_len; j++)
-    {
-      packet << out_buffer[j];
-    }
-
-    if (cur_len != NETPLAY_LZO_IN_LEN)
-      break;
-
-    i += cur_len;
-  }
-
-  // Mark end of data
-  packet << static_cast<u32>(0);
-
-  return true;
-}
-
 u64 NetPlayServer::GetInitialNetPlayRTC() const
 {
   const auto& config = SConfig::GetInstance();
diff --git a/Source/Core/Core/NetPlayServer.h b/Source/Core/Core/NetPlayServer.h
index b0019f92d4..26c7c6e20f 100644
--- a/Source/Core/Core/NetPlayServer.h
+++ b/Source/Core/Core/NetPlayServer.h
@@ -120,8 +120,6 @@ private:
   bool SyncSaveData();
   bool SyncCodes();
   void CheckSyncAndStartGame();
-  bool CompressFileIntoPacket(const std::string& file_path, sf::Packet& packet);
-  bool CompressBufferIntoPacket(const std::vector<u8>& in_buffer, sf::Packet& packet);
 
   u64 GetInitialNetPlayRTC() const;
 
diff --git a/Source/Core/DolphinLib.props b/Source/Core/DolphinLib.props
index 8ad1af3b4a..67c1a2eace 100644
--- a/Source/Core/DolphinLib.props
+++ b/Source/Core/DolphinLib.props
@@ -375,6 +375,7 @@
     <ClInclude Include="Core\MemTools.h" />
     <ClInclude Include="Core\Movie.h" />
     <ClInclude Include="Core\NetPlayClient.h" />
+    <ClInclude Include="Core\NetPlayCommon.h" />
     <ClInclude Include="Core\NetPlayProto.h" />
     <ClInclude Include="Core\NetPlayServer.h" />
     <ClInclude Include="Core\NetworkCaptureLogger.h" />
@@ -952,6 +953,7 @@
     <ClCompile Include="Core\MemTools.cpp" />
     <ClCompile Include="Core\Movie.cpp" />
     <ClCompile Include="Core\NetPlayClient.cpp" />
+    <ClCompile Include="Core\NetPlayCommon.cpp" />
     <ClCompile Include="Core\NetPlayServer.cpp" />
     <ClCompile Include="Core\NetworkCaptureLogger.cpp" />
     <ClCompile Include="Core\PatchEngine.cpp" />
@@ -1215,4 +1217,4 @@
   <ItemGroup>
     <Natvis Include="Common\BitField.natvis" />
   </ItemGroup>
-</Project>
\ No newline at end of file
+</Project>