diff --git a/src/inspector/main_thread_interface.cc b/src/inspector/main_thread_interface.cc
index 0a0afe8aeda0a9..c16f3451096612 100644
--- a/src/inspector/main_thread_interface.cc
+++ b/src/inspector/main_thread_interface.cc
@@ -1,8 +1,15 @@
 #include "main_thread_interface.h"
 
 #include "env-inl.h"
+#if !defined(_WIN32) || !defined(_M_ARM64)
 #include "simdutf.h"
+#endif
 #include "v8-inspector.h"
+#if defined(_WIN32) && defined(_M_ARM64)
+#include "util-inl.h"
+
+#include <unicode/unistr.h>
+#endif
 
 #include <functional>
 #include <memory>
@@ -286,12 +293,19 @@ Deletable* MainThreadInterface::GetObjectIfExists(int id) {
 }
 
 std::unique_ptr<StringBuffer> Utf8ToStringView(const std::string_view message) {
+#if defined(_WIN32) && defined(_M_ARM64)
+  icu::UnicodeString utf16 = icu::UnicodeString::fromUTF8(
+      icu::StringPiece(message.data(), message.length()));
+  StringView view(reinterpret_cast<const uint16_t*>(utf16.getBuffer()),
+                  utf16.length());
+#else
   size_t expected_u16_length =
       simdutf::utf16_length_from_utf8(message.data(), message.length());
   MaybeStackBuffer<char16_t> buffer(expected_u16_length);
   size_t utf16_length = simdutf::convert_utf8_to_utf16(
       message.data(), message.length(), buffer.out());
   StringView view(reinterpret_cast<uint16_t*>(buffer.out()), utf16_length);
+#endif
   return StringBuffer::create(view);
 }
 
diff --git a/src/inspector/node_string.cc b/src/inspector/node_string.cc
index 441d9a352eaca8..9b7ca254ab854e 100644
--- a/src/inspector/node_string.cc
+++ b/src/inspector/node_string.cc
@@ -1,7 +1,13 @@
 #include "node_string.h"
 #include "node/inspector/protocol/Protocol.h"
 #include "node_util.h"
+#if !defined(_WIN32) || !defined(_M_ARM64)
 #include "simdutf.h"
+#endif
+
+#if defined(_WIN32) && defined(_M_ARM64)
+#include <unicode/unistr.h>
+#endif
 
 namespace node {
 namespace inspector {
@@ -15,6 +21,13 @@ void builderAppendQuotedString(StringBuilder& builder,
                                const std::string_view string) {
   builder.put('"');
   if (!string.empty()) {
+#if defined(_WIN32) && defined(_M_ARM64)
+    icu::UnicodeString utf16 = icu::UnicodeString::fromUTF8(
+        icu::StringPiece(string.data(), string.length()));
+    escapeWideStringForJSON(
+        reinterpret_cast<const uint16_t*>(utf16.getBuffer()), utf16.length(),
+        &builder);
+#else
     size_t expected_utf16_length =
         simdutf::utf16_length_from_utf8(string.data(), string.length());
     MaybeStackBuffer<char16_t> buffer(expected_utf16_length);
@@ -24,6 +37,7 @@ void builderAppendQuotedString(StringBuilder& builder,
     escapeWideStringForJSON(reinterpret_cast<const uint16_t*>(buffer.out()),
                             utf16_length,
                             &builder);
+#endif
   }
   builder.put('"');
 }
@@ -31,6 +45,13 @@ void builderAppendQuotedString(StringBuilder& builder,
 std::unique_ptr<Value> parseJSON(const std::string_view string) {
   if (string.empty())
     return nullptr;
+#if defined(_WIN32) && defined(_M_ARM64)
+  icu::UnicodeString utf16 =
+      icu::UnicodeString::fromUTF8(icu::StringPiece(string.data(),
+                                                    string.length()));
+  return parseJSONCharacters(
+      reinterpret_cast<const uint16_t*>(utf16.getBuffer()), utf16.length());
+#else
   size_t expected_utf16_length =
       simdutf::utf16_length_from_utf8(string.data(), string.length());
   MaybeStackBuffer<char16_t> buffer(expected_utf16_length);
@@ -39,6 +60,7 @@ std::unique_ptr<Value> parseJSON(const std::string_view string) {
   CHECK_EQ(expected_utf16_length, utf16_length);
   return parseJSONCharacters(reinterpret_cast<const uint16_t*>(buffer.out()),
                              utf16_length);
+#endif
 }
 
 std::unique_ptr<Value> parseJSON(v8_inspector::StringView string) {
@@ -56,6 +78,26 @@ String StringViewToUtf8(v8_inspector::StringView view) {
     return std::string(reinterpret_cast<const char*>(view.characters8()),
                        view.length());
   }
+#if defined(_WIN32) && defined(_M_ARM64)
+  const uint16_t* source = view.characters16();
+  const UChar* unicodeSource = reinterpret_cast<const UChar*>(source);
+  static_assert(sizeof(*source) == sizeof(*unicodeSource),
+                "sizeof(*source) == sizeof(*unicodeSource)");
+
+  size_t result_length = view.length() * sizeof(*source);
+  std::string result(result_length, '\0');
+  icu::UnicodeString utf16(unicodeSource, view.length());
+  // ICU components for std::string compatibility are not enabled in build...
+  bool done = false;
+  while (!done) {
+    icu::CheckedArrayByteSink sink(&result[0], result_length);
+    utf16.toUTF8(sink);
+    result_length = sink.NumberOfBytesAppended();
+    result.resize(result_length);
+    done = !sink.Overflowed();
+  }
+  return result;
+#else
   const char16_t* source =
       reinterpret_cast<const char16_t*>(view.characters16());
   size_t expected_utf8_length =
@@ -65,6 +107,7 @@ String StringViewToUtf8(v8_inspector::StringView view) {
       simdutf::convert_utf16_to_utf8(source, view.length(), buffer.out());
   CHECK_EQ(expected_utf8_length, utf8_length);
   return String(buffer.out(), utf8_length);
+#endif
 }
 
 String fromDouble(double d) {
@@ -107,6 +150,11 @@ String fromUTF8(const uint8_t* data, size_t length) {
 }
 
 String fromUTF16(const uint16_t* data, size_t length) {
+#if defined(_WIN32) && defined(_M_ARM64)
+  icu::UnicodeString utf16(reinterpret_cast<const char16_t*>(data), length);
+  std::string result;
+  return utf16.toUTF8String(result);
+#else
   auto casted_data = reinterpret_cast<const char16_t*>(data);
   size_t expected_utf8_length =
       simdutf::utf8_length_from_utf16(casted_data, length);
@@ -115,6 +163,7 @@ String fromUTF16(const uint16_t* data, size_t length) {
       simdutf::convert_utf16_to_utf8(casted_data, length, buffer.out());
   CHECK_EQ(expected_utf8_length, utf8_length);
   return String(buffer.out(), utf8_length);
+#endif
 }
 
 const uint8_t* CharactersUTF8(const std::string_view s) {
@@ -122,8 +171,14 @@ const uint8_t* CharactersUTF8(const std::string_view s) {
 }
 
 size_t CharacterCount(const std::string_view s) {
+#if defined(_WIN32) && defined(_M_ARM64)
+  icu::UnicodeString utf16 =
+      icu::UnicodeString::fromUTF8(icu::StringPiece(s.data(), s.length()));
+  return utf16.countChar32();
+#else
   // TODO(@anonrig): Test to make sure CharacterCount returns correctly.
   return simdutf::utf32_length_from_utf8(s.data(), s.length());
+#endif
 }
 
 }  // namespace StringUtil