diff --git a/.codecov.yml b/.codecov.yml
index 229246c..8778dc5 100644
--- a/.codecov.yml
+++ b/.codecov.yml
@@ -4,6 +4,7 @@ codecov:
 ignore:
   - "deps"
   - "include/upa/idna.h"
+  - "include/upa/url_for_*.h"
   - "src/idna.cpp"
   - "test"
 
diff --git a/.github/workflows/test-ubuntu.yml b/.github/workflows/test-ubuntu.yml
index e54f838..6c9117b 100644
--- a/.github/workflows/test-ubuntu.yml
+++ b/.github/workflows/test-ubuntu.yml
@@ -45,6 +45,13 @@ jobs:
             cxx_standard: 20
             cmake_options: ""
 
+          - name: g++ C++17 Qt
+            os: ubuntu-24.04
+            cxx_compiler: g++
+            cxx_standard: 17
+            cmake_options: "-DUPA_TEST_URL_FOR_QT=ON"
+            install: "qt6-base-dev"
+
           - name: g++ C++17 Codecov
             os: ubuntu-latest
             cxx_compiler: g++
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3748187..3bc6b75 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -54,6 +54,7 @@ option(UPA_INSTALL "Generate the install target." ON)
 # library options
 option(UPA_AMALGAMATED "Use amalgamated URL library source." OFF)
 # tests build options
+option(UPA_TEST_URL_FOR_QT "Build tests with Qt strings" OFF)
 option(UPA_TEST_COVERAGE "Build tests with code coverage reporting" OFF)
 option(UPA_TEST_COVERAGE_CLANG "Build tests with Clang source-based code coverage" OFF)
 option(UPA_TEST_SANITIZER "Build tests with Clang sanitizer" OFF)
@@ -77,6 +78,11 @@ if (UPA_BUILD_FUZZER)
   endif()
 endif()
 
+# Tests with Qt strings
+if (UPA_TEST_URL_FOR_QT)
+  find_package(Qt6 REQUIRED COMPONENTS Core)
+endif()
+
 # Code coverage reporting
 if (UPA_TEST_COVERAGE AND CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
   # add flags for GCC & LLVM/Clang
@@ -156,6 +162,7 @@ if (UPA_BUILD_TESTS)
       test/test-url.cpp
       test/test-url-port.cpp
       test/test-url-setters.cpp
+      test/test-url_for_.cpp
       test/test-url_host.cpp
       test/test-url_percent_encode.cpp
       test/test-url_search_params.cpp
@@ -169,7 +176,14 @@ if (UPA_BUILD_TESTS)
     get_filename_component(test_name ${file} NAME_WE)
 
     add_executable(${test_name} ${file})
-    target_link_libraries(${test_name} ${upa_lib_target})
+    target_link_libraries(${test_name} PRIVATE ${upa_lib_target})
+
+    if ("${test_name}" STREQUAL "test-url_for_")
+      if (UPA_TEST_URL_FOR_QT)
+        target_compile_definitions(${test_name} PRIVATE UPA_TEST_URL_FOR_QT)
+        target_link_libraries(${test_name} PRIVATE Qt6::Core)
+      endif()
+    endif()
 
     add_test(NAME ${test_name}
       WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/test
diff --git a/Doxyfile b/Doxyfile
index bfe097d..30b6968 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -970,7 +970,8 @@ INPUT                  = include/upa/url.h \
                          include/upa/url_result.h \
                          include/upa/url_search_params.h \
                          include/upa/url_percent_encode.h \
-                         README.md
+                         README.md \
+                         doc/string_input.md
 
 # This tag can be used to specify the character encoding of the source files
 # that Doxygen parses. Internally Doxygen uses the UTF-8 encoding. Doxygen uses
diff --git a/README.md b/README.md
index cee329e..5b5282f 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ Upa URL contains features not specified in the standard:
 4. Experimental URLHost class (see proposal: https://github.com/whatwg/url/pull/288): `upa::url_host`
 5. The `upa::url_search_params` class has a few additional functions: `remove`, `remove_if`
 
-For string input, the library supports UTF-8, UTF-16, UTF-32 encodings and several string types, including `std::basic_string`, `std::basic_string_view`, null-terminated strings of any char type: `char`, `char8_t`, `char16_t`, `char32_t`, or `wchar_t`.
+For string input, the library supports UTF-8, UTF-16, UTF-32 encodings and several string types, including `std::basic_string`, `std::basic_string_view`, null-terminated strings of any char type: `char`, `char8_t`, `char16_t`, `char32_t`, or `wchar_t`. See ["String input"](doc/string_input.md) for more information.
 
 ## Installation
 
diff --git a/doc/string_input.md b/doc/string_input.md
new file mode 100644
index 0000000..322803c
--- /dev/null
+++ b/doc/string_input.md
@@ -0,0 +1,23 @@
+## String input
+
+For string input, the library supports UTF-8, UTF-16, UTF-32 encodings and several string types, including `std::basic_string`, `std::basic_string_view`, null-terminated strings of any char type: `char`, `char8_t`, `char16_t`, `char32_t`, or `wchar_t`.
+
+The ATL/MFC and Qt library string types are also supported. To use them you need to include the header files listed in the table below instead of `url.h`:
+
+| Library | Supported string types | Include instead of `url.h` |
+|-|-|-|
+| ATL/MFC | `CSimpleStringT`, `CStringT`, `CFixedStringT` | `url_for_atl.h` |
+| Qt | `QString`, `QStringView`, `QUtf8StringView` | `url_for_qt.h` |
+
+Qt example:
+```cpp
+#include "upa/url_for_qt.h"
+#include <QString>
+
+int main() {
+    QString str{"http://example.com/"};
+    upa::url url{str};
+    std::cout << url.href() << '\n';
+    return 0;
+}
+```
diff --git a/include/upa/url_for_atl.h b/include/upa/url_for_atl.h
new file mode 100644
index 0000000..979e0a9
--- /dev/null
+++ b/include/upa/url_for_atl.h
@@ -0,0 +1,63 @@
+// Copyright 2024 Rimas Misevičius
+// Distributed under the BSD-style license that can be
+// found in the LICENSE file.
+
+// This file can be included instead of url.h to allow strings of the
+// ATL/MFC classes CSimpleStringT, CStringT, CFixedStringT to be used
+// as string input in the functions of this library.
+//
+#ifndef UPA_URL_FOR_ATL_H
+#define UPA_URL_FOR_ATL_H
+
+#include "config.h"
+#include "url.h" // IWYU pragma: export
+#include <atlsimpstr.h>
+#ifdef UPA_CPP_20
+# include <concepts>
+#else
+# include <cstringt.h>
+#endif
+
+namespace upa {
+
+template<class StrT>
+struct str_arg_char_for_atl {
+    using type = typename StrT::XCHAR;
+
+    static str_arg<type> to_str_arg(const StrT& str) {
+        return { str.GetString(), static_cast<std::ptrdiff_t>(str.GetLength()) };
+    }
+};
+
+#ifdef UPA_CPP_20
+
+// CStringT and CFixedStringT are derived from CSimpleStringT
+template<class StrT>
+concept derived_from_CSimpleString =
+    std::derived_from<StrT, ATL::CSimpleStringT<char, true>> ||
+    std::derived_from<StrT, ATL::CSimpleStringT<wchar_t, true>> ||
+    std::derived_from<StrT, ATL::CSimpleStringT<char, false>> ||
+    std::derived_from<StrT, ATL::CSimpleStringT<wchar_t, false>>;
+
+template<derived_from_CSimpleString StrT>
+struct str_arg_char<StrT> : public str_arg_char_for_atl<StrT> {};
+
+#else // UPA_CPP_20
+
+template<typename CharT, bool mfcdll>
+struct str_arg_char<ATL::CSimpleStringT<CharT, mfcdll>> :
+    public str_arg_char_for_atl<ATL::CSimpleStringT<CharT, mfcdll>> {};
+
+template<typename CharT, class StringTraits>
+struct str_arg_char<ATL::CStringT<CharT, StringTraits>> :
+    public str_arg_char_for_atl<ATL::CStringT<CharT, StringTraits>> {};
+
+template<class StrT, int nChars>
+struct str_arg_char<ATL::CFixedStringT<StrT, nChars>> :
+    public str_arg_char_for_atl<ATL::CFixedStringT<StrT, nChars>> {};
+
+#endif // UPA_CPP_20
+
+} // namespace upa
+
+#endif // UPA_URL_FOR_ATL_H
diff --git a/include/upa/url_for_qt.h b/include/upa/url_for_qt.h
new file mode 100644
index 0000000..36d2eb1
--- /dev/null
+++ b/include/upa/url_for_qt.h
@@ -0,0 +1,61 @@
+// Copyright 2024 Rimas Misevičius
+// Distributed under the BSD-style license that can be
+// found in the LICENSE file.
+
+// This file can be included instead of url.h to allow strings of the
+// Qt classes QString, QStringView, QUtf8StringView to be used as string
+// input in the functions of this library.
+//
+#ifndef UPA_URL_FOR_QT_H
+#define UPA_URL_FOR_QT_H
+
+#include "url.h" // IWYU pragma: export
+#include <QString>
+#if defined(__has_include) && __has_include(<QtVersionChecks>)
+# include <QtVersionChecks>
+#else
+# include <QtGlobal>
+#endif
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
+# include <QStringView>
+#endif
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+# include <QUtf8StringView>
+#endif
+#include <cstddef> // std::ptrdiff_t
+
+namespace upa {
+
+template<class StrT, typename CharT>
+struct str_arg_char_for_qt {
+    static_assert(sizeof(typename StrT::value_type) == sizeof(CharT),
+        "StrT::value_type and CharT must be the same size");
+    using type = CharT;
+
+    static str_arg<type> to_str_arg(const StrT& str) {
+        return {
+            reinterpret_cast<const type*>(str.data()),
+            static_cast<std::ptrdiff_t>(str.length())
+        };
+    }
+};
+
+template<>
+struct str_arg_char<QString> :
+    public str_arg_char_for_qt<QString, char16_t> {};
+
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
+template<>
+struct str_arg_char<QStringView> :
+    public str_arg_char_for_qt<QStringView, char16_t> {};
+#endif
+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+template<>
+struct str_arg_char<QUtf8StringView> :
+    public str_arg_char_for_qt<QUtf8StringView, char> {};
+#endif
+
+} // namespace upa
+
+#endif // UPA_URL_FOR_QT_H
diff --git a/test/test-url_for_.cpp b/test/test-url_for_.cpp
new file mode 100644
index 0000000..149a62b
--- /dev/null
+++ b/test/test-url_for_.cpp
@@ -0,0 +1,85 @@
+// Copyright 2024 Rimas Misevičius
+// Distributed under the BSD-style license that can be
+// found in the LICENSE file.
+//
+
+#include "doctest-main.h"
+
+#ifdef _MSC_VER
+# define UPA_TEST_URL_FOR_ATL
+# include "upa/url_for_atl.h"
+# include <atlsimpstr.h>
+# include <atlstr.h>
+# include <cstringt.h>
+#endif
+
+#ifdef UPA_TEST_URL_FOR_QT
+# include "upa/url_for_qt.h"
+# include <QString>
+# if defined(__has_include) && __has_include(<QtVersionChecks>)
+#  include <QtVersionChecks>
+# else
+#  include <QtGlobal>
+# endif
+# if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
+#  include <QStringView>
+# endif
+# if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#  include <QUtf8StringView>
+# endif
+#endif
+
+
+#ifdef UPA_TEST_URL_FOR_ATL
+
+TEST_CASE("ATL::CSimpleStringA input") {
+    ATL::CStringA basestr;
+
+    ATL::CSimpleStringA str_input("http://host/", basestr.GetManager());
+    upa::url url{ str_input };
+    CHECK(url.href() == "http://host/");
+}
+
+TEST_CASE("ATL::CSimpleStringW input") {
+    ATL::CStringW basestr;
+
+    ATL::CSimpleStringW str_input(L"http://host/", basestr.GetManager());
+    upa::url url{ str_input };
+    CHECK(url.href() == "http://host/");
+}
+
+TEST_CASE_TEMPLATE_DEFINE("ATL string input", StrT, test_url_for_atl) {
+    StrT str_input("http://host/");
+    upa::url url{ str_input };
+    CHECK(url.href() == "http://host/");
+}
+
+TEST_CASE_TEMPLATE_INVOKE(test_url_for_atl,
+    ATL::CStringA, ATL::CFixedStringT<ATL::CStringA, 16>,
+    ATL::CStringW, ATL::CFixedStringT<ATL::CStringW, 16>);
+
+#endif // UPA_TEST_URL_FOR_ATL
+
+#ifdef UPA_TEST_URL_FOR_QT
+
+TEST_CASE_TEMPLATE_DEFINE("Qt string input", StrT, test_url_for_qt) {
+    StrT str_input("http://host/");
+    upa::url url{ str_input };
+    CHECK(url.href() == "http://host/");
+}
+
+TEST_CASE_TEMPLATE_INVOKE(test_url_for_qt, QString);
+
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
+TEST_CASE("QStringView input") {
+    QStringView str_input(u"http://host/");
+    upa::url url{ str_input };
+    CHECK(url.href() == "http://host/");
+}
+#endif
+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+TEST_CASE_TEMPLATE_INVOKE(test_url_for_qt, QUtf8StringView);
+#endif
+
+#endif // UPA_TEST_URL_FOR_QT