diff --git a/src/lib/arch/Arch.h b/src/lib/arch/Arch.h
index 635d8d079..60990a93d 100644
--- a/src/lib/arch/Arch.h
+++ b/src/lib/arch/Arch.h
@@ -24,6 +24,7 @@
 
 #pragma once
 
+#include "arch/ArchString.h"
 #include "common/Common.h"
 
 #if SYSAPI_WIN32
@@ -33,7 +34,6 @@
 #include "arch/win32/ArchMultithreadWindows.h"
 #include "arch/win32/ArchNetworkWinsock.h"
 #include "arch/win32/ArchSleepWindows.h"
-#include "arch/win32/ArchStringWindows.h"
 #include "arch/win32/ArchTimeWindows.h"
 
 #elif SYSAPI_UNIX
@@ -42,7 +42,6 @@
 #include "arch/unix/ArchLogUnix.h"
 #include "arch/unix/ArchNetworkBSD.h"
 #include "arch/unix/ArchSleepUnix.h"
-#include "arch/unix/ArchStringUnix.h"
 #include "arch/unix/ArchTimeUnix.h"
 
 #if HAVE_PTHREAD
@@ -72,7 +71,7 @@ class Arch : public ARCH_DAEMON,
              public ARCH_MULTITHREAD,
              public ARCH_NETWORK,
              public ARCH_SLEEP,
-             public ARCH_STRING,
+             public ArchString,
              public ARCH_TIME
 {
 public:
diff --git a/src/lib/arch/IArchString.cpp b/src/lib/arch/ArchString.cpp
similarity index 89%
rename from src/lib/arch/IArchString.cpp
rename to src/lib/arch/ArchString.cpp
index 164ed2745..a1ea335e8 100644
--- a/src/lib/arch/IArchString.cpp
+++ b/src/lib/arch/ArchString.cpp
@@ -5,9 +5,8 @@
  * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
  */
 
-#include "arch/IArchString.h"
+#include "arch/ArchString.h"
 #include "arch/Arch.h"
-#include "common/Common.h"
 
 #include <climits>
 #include <cstdlib>
@@ -19,7 +18,7 @@ static ArchMutex s_mutex = nullptr;
 // use C library non-reentrant multibyte conversion with mutex
 //
 
-IArchString::~IArchString()
+ArchString::~ArchString()
 {
   if (s_mutex != nullptr) {
     ARCH->closeMutex(s_mutex);
@@ -27,7 +26,7 @@ IArchString::~IArchString()
   }
 }
 
-int IArchString::convStringWCToMB(char *dst, const wchar_t *src, uint32_t n, bool *errors)
+int ArchString::convStringWCToMB(char *dst, const wchar_t *src, uint32_t n, bool *errors) const
 {
   ptrdiff_t len = 0;
 
@@ -81,7 +80,16 @@ int IArchString::convStringWCToMB(char *dst, const wchar_t *src, uint32_t n, boo
   return static_cast<int>(len);
 }
 
-int IArchString::convStringMBToWC(wchar_t *dst, const char *src, uint32_t n, bool *errors)
+ArchString::EWideCharEncoding ArchString::getWideCharEncoding() const
+{
+#ifdef SYSAPI_WIN32
+  return EWideCharEncoding::kUTF16;
+#else
+  return EWideCharEncoding::kUCS4;
+#endif
+}
+
+int ArchString::convStringMBToWC(wchar_t *dst, const char *src, uint32_t n, bool *errors) const
 {
   ptrdiff_t len = 0;
   wchar_t dummy;
diff --git a/src/lib/arch/IArchString.h b/src/lib/arch/ArchString.h
similarity index 68%
rename from src/lib/arch/IArchString.h
rename to src/lib/arch/ArchString.h
index cf679b746..495bf4928 100644
--- a/src/lib/arch/IArchString.h
+++ b/src/lib/arch/ArchString.h
@@ -18,16 +18,16 @@
 This interface defines the string operations required by
 deskflow.  Each architecture must implement this interface.
 */
-class IArchString : public IInterface
+class ArchString : public IInterface
 {
 public:
-  IArchString() = default;
-  IArchString(const IArchString &) = delete;
-  IArchString(IArchString &&) = delete;
-  ~IArchString() override;
+  ArchString() = default;
+  ArchString(const ArchString &) = delete;
+  ArchString(ArchString &&) = delete;
+  ~ArchString() override;
 
-  IArchString &operator=(const IArchString &) = delete;
-  IArchString &operator=(IArchString &&) = delete;
+  ArchString &operator=(const ArchString &) = delete;
+  ArchString &operator=(ArchString &&) = delete;
 
   //! Wide character encodings
   /*!
@@ -46,13 +46,13 @@ public:
   //@{
 
   //! Convert multibyte string to wide character string
-  virtual int convStringMBToWC(wchar_t *, const char *, uint32_t n, bool *errors);
+  int convStringMBToWC(wchar_t *, const char *, uint32_t n, bool *errors) const;
 
   //! Convert wide character string to multibyte string
-  virtual int convStringWCToMB(char *, const wchar_t *, uint32_t n, bool *errors);
+  int convStringWCToMB(char *, const wchar_t *, uint32_t n, bool *errors) const;
 
   //! Return the architecture's native wide character encoding
-  virtual EWideCharEncoding getWideCharEncoding() = 0;
+  EWideCharEncoding getWideCharEncoding() const;
 
   //@}
 };
diff --git a/src/lib/arch/CMakeLists.txt b/src/lib/arch/CMakeLists.txt
index 1f590e517..b7a441d52 100644
--- a/src/lib/arch/CMakeLists.txt
+++ b/src/lib/arch/CMakeLists.txt
@@ -18,8 +18,6 @@ if(WIN32)
     win32/ArchNetworkWinsock.h
     win32/ArchSleepWindows.cpp
     win32/ArchSleepWindows.h
-    win32/ArchStringWindows.cpp
-    win32/ArchStringWindows.h
     win32/ArchTimeWindows.cpp
     win32/ArchTimeWindows.h
     win32/XArchWindows.cpp
@@ -38,8 +36,6 @@ elseif(UNIX)
     unix/ArchNetworkBSD.h
     unix/ArchSleepUnix.cpp
     unix/ArchSleepUnix.h
-    unix/ArchStringUnix.cpp
-    unix/ArchStringUnix.h
     unix/ArchTimeUnix.cpp
     unix/ArchTimeUnix.h
     unix/XArchUnix.cpp
@@ -57,8 +53,8 @@ add_library(arch STATIC ${PLATFORM_CODE}
   IArchMultithread.h
   IArchNetwork.h
   IArchSleep.h
-  IArchString.cpp
-  IArchString.h
+  ArchString.cpp
+  ArchString.h
   IArchTime.h
   XArch.h
 )
diff --git a/src/lib/arch/unix/ArchStringUnix.cpp b/src/lib/arch/unix/ArchStringUnix.cpp
deleted file mode 100644
index 9b80178bc..000000000
--- a/src/lib/arch/unix/ArchStringUnix.cpp
+++ /dev/null
@@ -1,19 +0,0 @@
-/*
- * Deskflow -- mouse and keyboard sharing utility
- * SPDX-FileCopyrightText: (C) 2012 - 2016 Symless Ltd.
- * SPDX-FileCopyrightText: (C) 2002 Chris Schoeneman
- * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
- */
-
-#include "arch/unix/ArchStringUnix.h"
-
-#include <stdio.h>
-
-//
-// ArchStringUnix
-//
-
-IArchString::EWideCharEncoding ArchStringUnix::getWideCharEncoding()
-{
-  return EWideCharEncoding::kUCS4;
-}
diff --git a/src/lib/arch/unix/ArchStringUnix.h b/src/lib/arch/unix/ArchStringUnix.h
deleted file mode 100644
index fa65b15b6..000000000
--- a/src/lib/arch/unix/ArchStringUnix.h
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- * Deskflow -- mouse and keyboard sharing utility
- * SPDX-FileCopyrightText: (C) 2012 - 2016 Symless Ltd.
- * SPDX-FileCopyrightText: (C) 2002 Chris Schoeneman
- * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
- */
-
-#pragma once
-
-#include "arch/IArchString.h"
-
-#define ARCH_STRING ArchStringUnix
-
-//! Unix implementation of IArchString
-class ArchStringUnix : public IArchString
-{
-public:
-  ArchStringUnix() = default;
-  ~ArchStringUnix() override = default;
-
-  // IArchString overrides
-  EWideCharEncoding getWideCharEncoding() override;
-};
diff --git a/src/lib/arch/win32/ArchStringWindows.cpp b/src/lib/arch/win32/ArchStringWindows.cpp
deleted file mode 100644
index 5b3b2b551..000000000
--- a/src/lib/arch/win32/ArchStringWindows.cpp
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
- * Deskflow -- mouse and keyboard sharing utility
- * SPDX-FileCopyrightText: (C) 2025 Deskflow Developers
- * SPDX-FileCopyrightText: (C) 2012 - 2016 Symless Ltd.
- * SPDX-FileCopyrightText: (C) 2002 Chris Schoeneman
- * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
- */
-
-#include "arch/win32/ArchStringWindows.h"
-
-#define WIN32_LEAN_AND_MEAN
-#include <Windows.h>
-#include <stdio.h>
-
-//
-// ArchStringWindows
-//
-
-IArchString::EWideCharEncoding ArchStringWindows::getWideCharEncoding()
-{
-  return EWideCharEncoding::kUTF16;
-}
diff --git a/src/lib/arch/win32/ArchStringWindows.h b/src/lib/arch/win32/ArchStringWindows.h
deleted file mode 100644
index 2a204389c..000000000
--- a/src/lib/arch/win32/ArchStringWindows.h
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- * Deskflow -- mouse and keyboard sharing utility
- * SPDX-FileCopyrightText: (C) 2012 - 2016 Symless Ltd.
- * SPDX-FileCopyrightText: (C) 2002 Chris Schoeneman
- * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
- */
-
-#pragma once
-
-#include "arch/IArchString.h"
-
-#define ARCH_STRING ArchStringWindows
-
-//! Win32 implementation of IArchString
-class ArchStringWindows : public IArchString
-{
-public:
-  ArchStringWindows() = default;
-  ~ArchStringWindows() override = default;
-
-  // IArchString overrides
-  EWideCharEncoding getWideCharEncoding() override;
-};
diff --git a/src/lib/base/Unicode.cpp b/src/lib/base/Unicode.cpp
index f38230449..0289dc0d3 100644
--- a/src/lib/base/Unicode.cpp
+++ b/src/lib/base/Unicode.cpp
@@ -8,7 +8,7 @@
 #include "base/Unicode.h"
 #include "arch/Arch.h"
 
-using enum IArchString::EWideCharEncoding;
+using enum ArchString::EWideCharEncoding;
 //
 // local utility functions
 //
@@ -256,7 +256,7 @@ std::string Unicode::UTF32ToUTF8(const std::string_view &src, bool *errors)
   return doUTF32ToUTF8(reinterpret_cast<const uint8_t *>(src.data()), n, errors);
 }
 
-std::string Unicode::textToUTF8(const std::string &src, bool *errors, IArchString::EWideCharEncoding encoding)
+std::string Unicode::textToUTF8(const std::string &src, bool *errors, ArchString::EWideCharEncoding encoding)
 {
   // default to success
   resetError(errors);
@@ -312,7 +312,7 @@ wchar_t *Unicode::UTF8ToWideChar(const std::string &src, uint32_t &size, bool *e
 }
 
 std::string
-Unicode::wideCharToUTF8(const wchar_t *src, uint32_t size, bool *errors, IArchString::EWideCharEncoding encoding)
+Unicode::wideCharToUTF8(const wchar_t *src, uint32_t size, bool *errors, ArchString::EWideCharEncoding encoding)
 {
   if (encoding == kPlatformDetermined) {
     encoding = ARCH->getWideCharEncoding();
diff --git a/src/lib/base/Unicode.h b/src/lib/base/Unicode.h
index 882463a04..92eade1d4 100644
--- a/src/lib/base/Unicode.h
+++ b/src/lib/base/Unicode.h
@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include "arch/IArchString.h"
+#include "arch/ArchString.h"
 #include "common/Common.h"
 #include <string>
 
@@ -104,7 +104,7 @@ public:
   */
   static std::string textToUTF8(
       const std::string &, bool *errors = nullptr,
-      IArchString::EWideCharEncoding encoding = IArchString::EWideCharEncoding::kPlatformDetermined
+      ArchString::EWideCharEncoding encoding = ArchString::EWideCharEncoding::kPlatformDetermined
   );
 
   //@}
@@ -120,7 +120,7 @@ private:
   // encoding) to UTF8.
   static std::string wideCharToUTF8(
       const wchar_t *, uint32_t size, bool *errors,
-      IArchString::EWideCharEncoding encoding = IArchString::EWideCharEncoding::kPlatformDetermined
+      ArchString::EWideCharEncoding encoding = ArchString::EWideCharEncoding::kPlatformDetermined
   );
 
   // internal conversion to UTF8
diff --git a/src/unittests/arch/IArchStringTests.cpp b/src/unittests/arch/ArchStringTests.cpp
similarity index 72%
rename from src/unittests/arch/IArchStringTests.cpp
rename to src/unittests/arch/ArchStringTests.cpp
index 2079acd6d..1ce9d6b6b 100644
--- a/src/unittests/arch/IArchStringTests.cpp
+++ b/src/unittests/arch/ArchStringTests.cpp
@@ -5,19 +5,19 @@
  * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
  */
 
-#include "IArchStringTests.h"
+#include "ArchStringTests.h"
 
-#include "arch/IArchString.h"
+#include "arch/ArchString.h"
 
-void IArchStringTests::initTestCase()
+void ArchStringTests::initTestCase()
 {
   m_arch.init();
   m_log.setFilter(kDEBUG2);
 }
 
-void IArchStringTests::convertStringWCToMB_buffer()
+void ArchStringTests::convertStringWCToMB_buffer()
 {
-  SampleIArchString as;
+  ArchString as;
   char buff[20];
   bool errors;
 
@@ -28,9 +28,9 @@ void IArchStringTests::convertStringWCToMB_buffer()
   QVERIFY(!errors);
 }
 
-void IArchStringTests::convertStringWCToMB_noBuffer()
+void ArchStringTests::convertStringWCToMB_noBuffer()
 {
-  SampleIArchString as;
+  ArchString as;
   bool errors;
 
   auto converted = as.convStringWCToMB(nullptr, L"Hello", 6, &errors);
@@ -39,9 +39,9 @@ void IArchStringTests::convertStringWCToMB_noBuffer()
   QVERIFY(!errors);
 }
 
-void IArchStringTests::convertStringMBToWC()
+void ArchStringTests::convertStringMBToWC()
 {
-  SampleIArchString as;
+  ArchString as;
   wchar_t buff[20];
   bool errors;
 
@@ -55,4 +55,4 @@ void IArchStringTests::convertStringMBToWC()
   QVERIFY(!errors);
 }
 
-QTEST_MAIN(IArchStringTests)
+QTEST_MAIN(ArchStringTests)
diff --git a/src/unittests/arch/IArchStringTests.h b/src/unittests/arch/ArchStringTests.h
similarity index 71%
rename from src/unittests/arch/IArchStringTests.h
rename to src/unittests/arch/ArchStringTests.h
index dded25fc4..28bd02f33 100644
--- a/src/unittests/arch/IArchStringTests.h
+++ b/src/unittests/arch/ArchStringTests.h
@@ -8,16 +8,7 @@
 
 #include <QTest>
 
-class SampleIArchString : public IArchString
-{
-public:
-  EWideCharEncoding getWideCharEncoding() override
-  {
-    return EWideCharEncoding::kUTF16;
-  }
-};
-
-class IArchStringTests : public QObject
+class ArchStringTests : public QObject
 {
   Q_OBJECT
 private slots:
diff --git a/src/unittests/arch/CMakeLists.txt b/src/unittests/arch/CMakeLists.txt
index 9ba60210f..141342ce1 100644
--- a/src/unittests/arch/CMakeLists.txt
+++ b/src/unittests/arch/CMakeLists.txt
@@ -6,9 +6,9 @@ if(WIN32)
 endif()
 
 create_test(
-  NAME IArchStringTests
+  NAME ArchStringTests
   DEPENDS arch
   LIBS base ${extra_libs}
-  SOURCE IArchStringTests.cpp
+  SOURCE ArchStringTests.cpp
   WORKING_DIRECTORY "${CMAKE_BINARY_DIR}/src/lib/arch"
 )
diff --git a/src/unittests/base/UnicodeTests.cpp b/src/unittests/base/UnicodeTests.cpp
index 153179ba4..158681389 100644
--- a/src/unittests/base/UnicodeTests.cpp
+++ b/src/unittests/base/UnicodeTests.cpp
@@ -7,7 +7,7 @@
 
 #include "UnicodeTests.h"
 
-#include "arch/IArchString.h"
+#include "arch/ArchString.h"
 #include "base/Unicode.h"
 
 void UnicodeTests::initTestCase()
@@ -37,7 +37,7 @@ void UnicodeTests::UTF16ToUTF8()
 void UnicodeTests::UCS2ToUTF8_kUCS2()
 {
   bool errors;
-  auto result = Unicode::textToUTF8("hello", &errors, IArchString::EWideCharEncoding::kUCS2);
+  auto result = Unicode::textToUTF8("hello", &errors, ArchString::EWideCharEncoding::kUCS2);
 
   QVERIFY(!errors);
 #ifdef _WIN32