diff --git a/README.md b/README.md
index a8c1584..57e1e81 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,9 @@ Packer by default works off a command line. Listed below are the arguments requr
 
 ## Usage example
 ```commandline
-Usage: pe-packer <input> <output> mutations_count -mba ... -noaslr -fpack 0x00401040 0x00401072
+pe-packer.exe <input.exe> <output.exe> <mutations> [flags...]
+
+pe-packer.exe file.exe file_packed.exe 5 -mba -senc -fpack 0x401040 0x401072
 ```
 
 > [!NOTE]
@@ -46,3 +48,4 @@ I am going to periodically update the functionality, add new tricks that I find,
 
 * [AsmJit](https://github.com/asmjit/asmjit)
 * [PeBliss](https://github.com/BackupGGCode/portable-executable-library)
+* [Dear ImGui](https://github.com/ocornut/imgui)
diff --git a/pe-packer/gui/gui_app.cpp b/pe-packer/gui/gui_app.cpp
new file mode 100644
index 0000000..98f95ed
--- /dev/null
+++ b/pe-packer/gui/gui_app.cpp
@@ -0,0 +1,670 @@
+#define WIN32_LEAN_AND_MEAN
+#include "gui_app.hpp"
+
+#include <Windows.h>
+#include <d3d11.h>
+#include <tchar.h>
+#include <commdlg.h>
+#include <windowsx.h>
+#include <dwmapi.h>
+
+#include <array>
+#include <algorithm>
+#include <cstdio>
+#include <cstdlib>
+#include <filesystem>
+#include <memory>
+#include <string>
+#include <sstream>
+#include <utility>
+#include <vector>
+#include <iomanip>
+#include <cstring>
+
+#include "../core/core.hpp"
+#include "../handler/handler.hpp"
+#include "../utils/arguments.hpp"
+#include "../utils/utils.hpp"
+
+#include "../../vendor/imgui/imgui.h"
+#include "../../vendor/imgui/backends/imgui_impl_dx11.h"
+#include "../../vendor/imgui/backends/imgui_impl_win32.h"
+
+extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
+
+#pragma comment(lib, "d3d11.lib")
+#pragma comment(lib, "dxgi.lib")
+#pragma comment(lib, "d3dcompiler.lib")
+#pragma comment(lib, "dwmapi.lib")
+
+static constexpr int kGuiWidth = 800;
+static constexpr int kGuiHeight = 600;
+
+struct GuiState {
+    std::array<char, MAX_PATH> input{};
+    std::array<char, MAX_PATH> output{};
+    std::array<char, 32> fpackStart{};
+    std::array<char, 32> fpackEnd{};
+    int mutationBase = 1;
+    bool removeAslr = false;
+    bool obfuscateOep = false;
+    bool antiDisasm = false;
+    bool mba = false;
+    bool encryptSections = false;
+    bool fakeInstructions = false;
+    bool packFunctions = false;
+    bool outputCustomized = false;
+    std::vector<std::pair<std::string, bool>> logEntries;
+};
+
+static ID3D11Device*           g_pd3dDevice = nullptr;
+static ID3D11DeviceContext*    g_pd3dDeviceContext = nullptr;
+static IDXGISwapChain*         g_pSwapChain = nullptr;
+static ID3D11RenderTargetView* g_mainRenderTargetView = nullptr;
+
+static bool CreateDeviceD3D(HWND hWnd);
+static void CleanupDeviceD3D();
+static void CreateRenderTarget();
+static void CleanupRenderTarget();
+static LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
+static bool ExecutePacking(const GuiState& state, std::string& statusMessage);
+static void RenderGui(GuiState& state, std::string& statusMessage, bool& lastSuccess);
+static bool BrowseInputFile(GuiState& state);
+static bool BrowseOutputFile(GuiState& state);
+static void SetDefaultOutputFromInput(GuiState& state);
+static void CopyStringToBuffer(const std::string& value, std::array<char, MAX_PATH>& buffer);
+static void ApplyBorderlessWindow(HWND hwnd, int width, int height);
+static void ApplyCustomTheme(ImGuiStyle& style);
+
+int run_gui() {
+    WNDCLASSEX wc = {
+        sizeof(WNDCLASSEX),
+        CS_CLASSDC,
+        WndProc,
+        0L,
+        0L,
+        GetModuleHandle(nullptr),
+        nullptr,
+        nullptr,
+        nullptr,
+        nullptr,
+        _T("pe-packer-gui"),
+        nullptr
+    };
+    RegisterClassEx(&wc);
+
+    HWND hwnd = CreateWindow(
+        wc.lpszClassName,
+        _T("pe-packer"),
+        WS_POPUP,
+        100, 100,
+        kGuiWidth, kGuiHeight,
+        nullptr,
+        nullptr,
+        wc.hInstance,
+        nullptr);
+
+    ApplyBorderlessWindow(hwnd, kGuiWidth, kGuiHeight);
+
+    if (!CreateDeviceD3D(hwnd)) {
+        CleanupDeviceD3D();
+        UnregisterClass(wc.lpszClassName, wc.hInstance);
+        return EXIT_FAILURE;
+    }
+
+    ShowWindow(hwnd, SW_SHOWDEFAULT);
+    UpdateWindow(hwnd);
+
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+    ImGuiIO& io = ImGui::GetIO();
+    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+
+    ApplyCustomTheme(ImGui::GetStyle());
+
+    ImGui_ImplWin32_Init(hwnd);
+    ImGui_ImplDX11_Init(g_pd3dDevice, g_pd3dDeviceContext);
+
+    GuiState state{};
+    std::string statusMessage;
+    bool lastSuccess = false;
+
+    MSG msg{};
+    bool done = false;
+    while (!done) {
+        while (PeekMessage(&msg, nullptr, 0U, 0U, PM_REMOVE)) {
+            TranslateMessage(&msg);
+            DispatchMessage(&msg);
+            if (msg.message == WM_QUIT) {
+                done = true;
+            }
+        }
+        if (done) {
+            break;
+        }
+
+        ImGui_ImplDX11_NewFrame();
+        ImGui_ImplWin32_NewFrame();
+        ImGui::NewFrame();
+
+        RenderGui(state, statusMessage, lastSuccess);
+
+        ImGui::Render();
+        ImVec4 windowColor = ImGui::GetStyle().Colors[ImGuiCol_WindowBg];
+        const float clear_color_with_alpha[4] = { windowColor.x, windowColor.y, windowColor.z, 1.0f };
+        g_pd3dDeviceContext->OMSetRenderTargets(1, &g_mainRenderTargetView, nullptr);
+        g_pd3dDeviceContext->ClearRenderTargetView(g_mainRenderTargetView, clear_color_with_alpha);
+        ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());
+
+        g_pSwapChain->Present(1, 0);
+    }
+
+    ImGui_ImplDX11_Shutdown();
+    ImGui_ImplWin32_Shutdown();
+    ImGui::DestroyContext();
+
+    CleanupDeviceD3D();
+    DestroyWindow(hwnd);
+    UnregisterClass(wc.lpszClassName, wc.hInstance);
+
+    return EXIT_SUCCESS;
+}
+
+bool ExecutePacking(const GuiState& state, std::string& statusMessage) {
+    std::string inputPath(state.input.data());
+    std::string outputPath(state.output.data());
+    std::string fpackStart(state.fpackStart.data());
+    std::string fpackEnd(state.fpackEnd.data());
+
+    if (inputPath.empty()) {
+        statusMessage = "Input file path is required.";
+        return false;
+    }
+    if (outputPath.empty()) {
+        statusMessage = "Output file path is required.";
+        return false;
+    }
+    if (state.mutationBase < 1) {
+        statusMessage = "Mutations must be at least 1.";
+        return false;
+    }
+    if (state.packFunctions && (fpackStart.empty() || fpackEnd.empty())) {
+        statusMessage = "Provide both start and end addresses for -fpack.";
+        return false;
+    }
+
+    std::vector<std::string> args;
+    args.emplace_back("pe-packer");
+    args.emplace_back(inputPath);
+    args.emplace_back(outputPath);
+    args.emplace_back(std::to_string(state.mutationBase));
+
+    auto append_flag = [&args](bool enabled, const char* flag) {
+        if (enabled) {
+            args.emplace_back(flag);
+        }
+    };
+
+    append_flag(state.removeAslr, "-noaslr");
+    append_flag(state.obfuscateOep, "-oep_call");
+    append_flag(state.antiDisasm, "-adasm");
+    append_flag(state.mba, "-mba");
+    append_flag(state.encryptSections, "-senc");
+    append_flag(state.fakeInstructions, "-finstr");
+
+    if (state.packFunctions) {
+        args.emplace_back("-fpack");
+        args.emplace_back(fpackStart);
+        args.emplace_back(fpackEnd);
+    }
+
+    std::vector<char*> argv;
+    argv.reserve(args.size());
+    for (auto& arg : args) {
+        argv.push_back(const_cast<char*>(arg.data()));
+    }
+
+    arguments::init(static_cast<int>(argv.size()), argv.data());
+
+    try {
+        const auto mutations = static_cast<uint32_t>(state.mutationBase * 10);
+        print_info("Mutations count: %u\n", mutations);
+        auto packer = std::make_unique<c_core>(inputPath, outputPath, mutations);
+        packer->process();
+        statusMessage = "Packing completed successfully.";
+        return true;
+    }
+    catch (const std::exception& ex) {
+        statusMessage = ex.what();
+        return false;
+    }
+}
+
+void RenderGui(GuiState& state, std::string& statusMessage, bool& lastSuccess) {
+    ImGuiIO& io = ImGui::GetIO();
+    ImGui::SetNextWindowPos(ImVec2(0.0f, 0.0f), ImGuiCond_Always);
+    ImGui::SetNextWindowSize(io.DisplaySize, ImGuiCond_Always);
+    ImGuiWindowFlags windowFlags = ImGuiWindowFlags_NoTitleBar |
+        ImGuiWindowFlags_NoResize |
+        ImGuiWindowFlags_NoMove |
+        ImGuiWindowFlags_NoCollapse |
+        ImGuiWindowFlags_NoBringToFrontOnFocus;
+
+    if (ImGui::Begin("pe-packer GUI", nullptr, windowFlags)) {
+        ImGui::PushStyleColor(ImGuiCol_Text, ImVec4(0.82f, 0.88f, 0.95f, 1.0f));
+        ImGui::Text("pe-packer");
+        ImGui::PopStyleColor();
+        ImGui::SameLine();
+        ImGui::TextDisabled("| Version 1.0.1");
+        ImGui::Spacing();
+
+        const float browseWidth = 110.0f;
+        const float minFieldWidth = 160.0f;
+        ImGuiStyle& style = ImGui::GetStyle();
+
+        auto fileInputRow = [&](const char* label, std::array<char, MAX_PATH>& buffer, auto&& browseFn) -> bool {
+            ImGui::PushID(label);
+            ImGui::AlignTextToFramePadding();
+            ImGui::TextUnformatted(label);
+            ImGui::SameLine();
+            float avail = ImGui::GetContentRegionAvail().x;
+            float fieldWidth = avail - browseWidth - style.ItemSpacing.x;
+            if (fieldWidth < minFieldWidth) {
+                fieldWidth = minFieldWidth;
+            }
+            ImGui::SetNextItemWidth(fieldWidth);
+            bool edited = ImGui::InputText("##path", buffer.data(), buffer.size());
+            ImGui::SameLine();
+            if (ImGui::Button("Browse", ImVec2(browseWidth, 0.f)) && browseFn()) {
+                edited = true;
+            }
+            ImGui::PopID();
+            return edited;
+        };
+
+        if (fileInputRow("Input file", state.input, [&]() { return BrowseInputFile(state); })) {
+            SetDefaultOutputFromInput(state);
+        }
+
+        if (fileInputRow("Output file", state.output, [&]() { return BrowseOutputFile(state); })) {
+            state.outputCustomized = true;
+        }
+
+        ImGui::Spacing();
+        ImGui::Separator();
+        ImGui::Spacing();
+
+        ImGui::SliderInt("Mutations", &state.mutationBase, 1, 100);
+        ImGui::SameLine();
+        ImGui::TextDisabled("=> %d iterations", state.mutationBase * 10);
+
+        ImGui::Spacing();
+        ImGui::Text("Options");
+        ImGui::PushStyleVar(ImGuiStyleVar_CellPadding, ImVec2(6.f, 4.f));
+        if (ImGui::BeginTable("OptionsFlags", 2, ImGuiTableFlags_SizingStretchProp)) {
+            auto checkbox = [](const char* label, bool* value) {
+                ImGui::TableNextColumn();
+                ImGui::Checkbox(label, value);
+            };
+            checkbox("Remove ASLR", &state.removeAslr);
+            checkbox("OEP call obfuscation", &state.obfuscateOep);
+            checkbox("Anti-disassembly", &state.antiDisasm);
+            checkbox("Mixed Boolean Arithmetic obfuscation", &state.mba);
+            checkbox("Encrypt sections", &state.encryptSections);
+            checkbox("Generate fake instructions", &state.fakeInstructions);
+            ImGui::EndTable();
+        }
+        ImGui::PopStyleVar();
+
+        ImGui::Spacing();
+        if (ImGui::Checkbox("Encrypt function", &state.packFunctions)) {
+            if (!state.packFunctions) {
+                state.fpackStart.fill(0);
+                state.fpackEnd.fill(0);
+            }
+        }
+
+        if (state.packFunctions) {
+            ImGui::Indent();
+            ImGui::InputText("Start address (hex)", state.fpackStart.data(), state.fpackStart.size());
+            ImGui::InputText("End address (hex)", state.fpackEnd.data(), state.fpackEnd.size());
+            ImGui::Unindent();
+        }
+
+        ImGui::Spacing();
+        ImGui::Spacing();
+        ImGui::Separator();
+        ImGui::Spacing();
+
+        const float packWidth = 150.0f;
+        const float exitWidth = 110.0f;
+        float buttonSpacing = style.ItemSpacing.x;
+        float availableWidth = ImGui::GetContentRegionAvail().x;
+        float totalWidth = packWidth + exitWidth + buttonSpacing;
+        float offset = (availableWidth - totalWidth) * 0.5f;
+        if (offset < 0.0f) {
+            offset = 0.0f;
+        }
+        float startX = ImGui::GetCursorPosX() + offset;
+        ImGui::SetCursorPosX(startX);
+
+        if (ImGui::Button("Pack", ImVec2(packWidth, 0.0f))) {
+            lastSuccess = ExecutePacking(state, statusMessage);
+            std::ostringstream line;
+            SYSTEMTIME st{};
+            GetLocalTime(&st);
+            line << "[" << std::setfill('0') << std::setw(2) << st.wHour << ":"
+                 << std::setfill('0') << std::setw(2) << st.wMinute << ":"
+                 << std::setfill('0') << std::setw(2) << st.wSecond << "] "
+                 << statusMessage;
+            state.logEntries.emplace_back(line.str(), lastSuccess);
+            if (state.logEntries.size() > 100) {
+                state.logEntries.erase(state.logEntries.begin());
+            }
+        }
+        ImGui::SameLine(0.0f, buttonSpacing);
+        if (ImGui::Button("Exit", ImVec2(exitWidth, 0.0f))) {
+            PostQuitMessage(0);
+        }
+
+        ImGui::Spacing();
+        ImGui::Spacing();
+
+        ImDrawList* drawList = ImGui::GetWindowDrawList();
+        ImVec2 min = ImGui::GetCursorScreenPos();
+        ImVec2 avail = ImGui::GetContentRegionAvail();
+        ImVec2 max = ImVec2(min.x + avail.x, min.y + 160.0f);
+        ImVec4 headerColor = ImVec4(0.16f, 0.18f, 0.22f, 0.95f);
+        drawList->AddRectFilled(min, max, ImGui::ColorConvertFloat4ToU32(headerColor), 16.0f);
+        ImGui::Dummy(ImVec2(0.0f, 8.0f));
+        ImGui::SetCursorScreenPos(ImVec2(min.x + 12.0f, min.y + 10.0f));
+        ImGui::TextDisabled("Activity");
+        ImGui::SetCursorScreenPos(ImVec2(min.x + 10.0f, min.y + 36.0f));
+
+        ImGui::PushStyleVar(ImGuiStyleVar_ChildRounding, 12.0f);
+        if (ImGui::BeginChild("log_region", ImVec2(avail.x - 20.0f, 110.0f), false, ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoBackground)) {
+            if (state.logEntries.empty()) {
+                ImGui::TextDisabled("Logs will appear here.");
+            } else {
+                for (auto it = state.logEntries.rbegin(); it != state.logEntries.rend(); ++it) {
+                    ImVec4 color = it->second ? ImVec4(0.45f, 0.82f, 0.53f, 1.0f) : ImVec4(0.91f, 0.48f, 0.40f, 1.0f);
+                    ImGui::PushStyleColor(ImGuiCol_Text, color);
+                    ImGui::TextWrapped("%s", it->first.c_str());
+                    ImGui::PopStyleColor();
+                }
+            }
+        }
+        ImGui::EndChild();
+        ImGui::PopStyleVar();
+    }
+    ImGui::End();
+}
+
+bool CreateDeviceD3D(HWND hWnd) {
+    DXGI_SWAP_CHAIN_DESC sd{};
+    sd.BufferCount = 2;
+    sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+    sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
+    sd.OutputWindow = hWnd;
+    sd.SampleDesc.Count = 1;
+    sd.Windowed = TRUE;
+    sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
+    sd.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH;
+
+    UINT createDeviceFlags = 0;
+#ifdef _DEBUG
+    createDeviceFlags |= D3D11_CREATE_DEVICE_DEBUG;
+#endif
+
+    D3D_FEATURE_LEVEL featureLevel;
+    const D3D_FEATURE_LEVEL featureLevelArray[2] = {
+        D3D_FEATURE_LEVEL_11_0,
+        D3D_FEATURE_LEVEL_10_0,
+    };
+
+    HRESULT res = D3D11CreateDeviceAndSwapChain(
+        nullptr,
+        D3D_DRIVER_TYPE_HARDWARE,
+        nullptr,
+        createDeviceFlags,
+        featureLevelArray,
+        2,
+        D3D11_SDK_VERSION,
+        &sd,
+        &g_pSwapChain,
+        &g_pd3dDevice,
+        &featureLevel,
+        &g_pd3dDeviceContext);
+
+    if (res == DXGI_ERROR_UNSUPPORTED) {
+        res = D3D11CreateDeviceAndSwapChain(
+            nullptr,
+            D3D_DRIVER_TYPE_WARP,
+            nullptr,
+            createDeviceFlags,
+            featureLevelArray,
+            2,
+            D3D11_SDK_VERSION,
+            &sd,
+            &g_pSwapChain,
+            &g_pd3dDevice,
+            &featureLevel,
+            &g_pd3dDeviceContext);
+    }
+
+    if (FAILED(res)) {
+        return false;
+    }
+
+    CreateRenderTarget();
+    return true;
+}
+
+void CleanupDeviceD3D() {
+    CleanupRenderTarget();
+    if (g_pSwapChain) { g_pSwapChain->Release(); g_pSwapChain = nullptr; }
+    if (g_pd3dDeviceContext) { g_pd3dDeviceContext->Release(); g_pd3dDeviceContext = nullptr; }
+    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = nullptr; }
+}
+
+void CreateRenderTarget() {
+    ID3D11Texture2D* pBackBuffer = nullptr;
+    if (g_pSwapChain && SUCCEEDED(g_pSwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer)))) {
+        g_pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &g_mainRenderTargetView);
+        pBackBuffer->Release();
+    }
+}
+
+void CleanupRenderTarget() {
+    if (g_mainRenderTargetView) {
+        g_mainRenderTargetView->Release();
+        g_mainRenderTargetView = nullptr;
+    }
+}
+
+LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) {
+    if (ImGui_ImplWin32_WndProcHandler(hWnd, msg, wParam, lParam)) {
+        return true;
+    }
+
+    switch (msg) {
+    case WM_NCHITTEST: {
+        POINT cursor{ GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
+        ScreenToClient(hWnd, &cursor);
+        RECT rc{};
+        GetClientRect(hWnd, &rc);
+        if (cursor.y >= rc.top && cursor.y < rc.top + 32) {
+            return HTCAPTION;
+        }
+        return HTCLIENT;
+    }
+    case WM_SIZE:
+        if (g_pd3dDevice != nullptr && wParam != SIZE_MINIMIZED) {
+            CleanupRenderTarget();
+            g_pSwapChain->ResizeBuffers(0, LOWORD(lParam), HIWORD(lParam), DXGI_FORMAT_UNKNOWN, 0);
+            CreateRenderTarget();
+        }
+        return 0;
+    case WM_DESTROY:
+        PostQuitMessage(0);
+        return 0;
+    case WM_DPICHANGED:
+        if (const RECT* const prcNewWindow = reinterpret_cast<RECT*>(lParam)) {
+            SetWindowPos(hWnd, nullptr,
+                prcNewWindow->left,
+                prcNewWindow->top,
+                prcNewWindow->right - prcNewWindow->left,
+                prcNewWindow->bottom - prcNewWindow->top,
+                SWP_NOZORDER | SWP_NOACTIVATE);
+        }
+        return 0;
+    default:
+        break;
+    }
+    return DefWindowProc(hWnd, msg, wParam, lParam);
+}
+
+std::string BuildDefaultOutputPath(const std::string& input) {
+    if (input.empty()) {
+        return {};
+    }
+
+    std::filesystem::path inputPath(input);
+    auto parent = inputPath.parent_path();
+    std::string stem = inputPath.stem().string();
+    if (stem.empty()) {
+        stem = "packed";
+    }
+
+    std::filesystem::path outName = stem + "_packed.exe";
+    if (!parent.empty()) {
+        outName = parent / outName;
+    }
+    return outName.string();
+}
+
+void CopyStringToBuffer(const std::string& value, std::array<char, MAX_PATH>& buffer) {
+    strncpy_s(buffer.data(), buffer.size(), value.c_str(), buffer.size() - 1);
+}
+
+void SetDefaultOutputFromInput(GuiState& state) {
+    if (state.outputCustomized) {
+        return;
+    }
+
+    std::string defaultPath = BuildDefaultOutputPath(state.input.data());
+    if (!defaultPath.empty()) {
+        CopyStringToBuffer(defaultPath, state.output);
+    }
+}
+
+bool BrowseInputFile(GuiState& state) {
+    OPENFILENAMEA ofn{};
+    ofn.lStructSize = sizeof(ofn);
+    ofn.hwndOwner = GetForegroundWindow();
+    ofn.lpstrFile = state.input.data();
+    ofn.nMaxFile = static_cast<DWORD>(state.input.size());
+    ofn.lpstrFilter = "Executable Files (*.exe)\0*.exe\0All Files (*.*)\0*.*\0\0";
+    ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
+
+    if (GetOpenFileNameA(&ofn) == TRUE) {
+        state.outputCustomized = false;
+        SetDefaultOutputFromInput(state);
+        return true;
+    }
+    return false;
+}
+
+bool BrowseOutputFile(GuiState& state) {
+    OPENFILENAMEA ofn{};
+    ofn.lStructSize = sizeof(ofn);
+    ofn.hwndOwner = GetForegroundWindow();
+    ofn.lpstrFile = state.output.data();
+    ofn.nMaxFile = static_cast<DWORD>(state.output.size());
+    ofn.lpstrFilter = "Executable Files (*.exe)\0*.exe\0All Files (*.*)\0*.*\0\0";
+    ofn.lpstrDefExt = "exe";
+    ofn.Flags = OFN_OVERWRITEPROMPT;
+
+    if (GetSaveFileNameA(&ofn) == TRUE) {
+        state.outputCustomized = true;
+        return true;
+    }
+    return false;
+}
+
+void ApplyBorderlessWindow(HWND hwnd, int width, int height) {
+    if (!hwnd) {
+        return;
+    }
+
+    RECT rect{};
+    GetWindowRect(hwnd, &rect);
+
+    LONG style = GetWindowLong(hwnd, GWL_STYLE);
+    style &= ~(WS_CAPTION | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_SYSMENU);
+    style |= WS_POPUP;
+    SetWindowLong(hwnd, GWL_STYLE, style);
+
+    LONG exStyle = GetWindowLong(hwnd, GWL_EXSTYLE);
+    exStyle &= ~(WS_EX_CLIENTEDGE | WS_EX_DLGMODALFRAME);
+    SetWindowLong(hwnd, GWL_EXSTYLE, exStyle);
+
+    SetWindowPos(
+        hwnd,
+        nullptr,
+        rect.left,
+        rect.top,
+        width,
+        height,
+        SWP_FRAMECHANGED | SWP_NOZORDER | SWP_NOACTIVATE);
+
+    const int radius = 24;
+    HRGN region = CreateRoundRectRgn(0, 0, width + 1, height + 1, radius, radius);
+    if (region) {
+        SetWindowRgn(hwnd, region, TRUE);
+    }
+
+#if defined(DWMWA_WINDOW_CORNER_PREFERENCE)
+    const DWM_WINDOW_CORNER_PREFERENCE pref = DWMWCP_ROUND;
+    DwmSetWindowAttribute(hwnd, DWMWA_WINDOW_CORNER_PREFERENCE, &pref, sizeof(pref));
+#endif
+}
+
+// Some styles xD
+void ApplyCustomTheme(ImGuiStyle& style) {
+    style.WindowPadding = ImVec2(20.0f, 16.0f);
+    style.FramePadding = ImVec2(12.0f, 6.0f);
+    style.ItemSpacing = ImVec2(10.0f, 8.0f);
+    style.WindowRounding = 20.0f;
+    style.FrameRounding = 10.0f;
+    style.ScrollbarRounding = 12.0f;
+    style.GrabRounding = 10.0f;
+    style.WindowBorderSize = 0.0f;
+    style.FrameBorderSize = 0.0f;
+    style.ChildBorderSize = 0.0f;
+
+    ImVec4 bg = ImVec4(0.11f, 0.13f, 0.17f, 1.0f);
+    ImVec4 panel = ImVec4(0.16f, 0.18f, 0.24f, 1.0f);
+    ImVec4 accent = ImVec4(0.29f, 0.47f, 0.83f, 1.0f);
+    ImVec4 accentHover = ImVec4(0.36f, 0.55f, 0.91f, 1.0f);
+    ImVec4 accentActive = ImVec4(0.24f, 0.40f, 0.75f, 1.0f);
+
+    style.Colors[ImGuiCol_WindowBg] = bg;
+    style.Colors[ImGuiCol_ChildBg] = ImVec4(bg.x + 0.01f, bg.y + 0.01f, bg.z + 0.02f, 1.0f);
+    style.Colors[ImGuiCol_PopupBg] = panel;
+    style.Colors[ImGuiCol_FrameBg] = panel;
+    style.Colors[ImGuiCol_FrameBgHovered] = accentHover;
+    style.Colors[ImGuiCol_FrameBgActive] = accentActive;
+    style.Colors[ImGuiCol_Button] = accent;
+    style.Colors[ImGuiCol_ButtonHovered] = accentHover;
+    style.Colors[ImGuiCol_ButtonActive] = accentActive;
+    style.Colors[ImGuiCol_Header] = accent;
+    style.Colors[ImGuiCol_HeaderHovered] = accentHover;
+    style.Colors[ImGuiCol_HeaderActive] = accentActive;
+    style.Colors[ImGuiCol_CheckMark] = ImVec4(0.92f, 0.95f, 0.98f, 1.0f);
+    style.Colors[ImGuiCol_SliderGrab] = ImVec4(0.88f, 0.92f, 1.0f, 1.0f);
+    style.Colors[ImGuiCol_SliderGrabActive] = accentActive;
+    style.Colors[ImGuiCol_Separator] = ImVec4(0.25f, 0.27f, 0.32f, 1.0f);
+    style.Colors[ImGuiCol_Text] = ImVec4(0.90f, 0.94f, 0.98f, 1.0f);
+    style.Colors[ImGuiCol_TextDisabled] = ImVec4(0.60f, 0.64f, 0.70f, 1.0f);
+}
\ No newline at end of file
diff --git a/pe-packer/gui/gui_app.hpp b/pe-packer/gui/gui_app.hpp
new file mode 100644
index 0000000..8e949cb
--- /dev/null
+++ b/pe-packer/gui/gui_app.hpp
@@ -0,0 +1,4 @@
+#pragma once
+
+int run_gui();
+
diff --git a/pe-packer/pe-packer.cpp b/pe-packer/pe-packer.cpp
index e7084af..984a4be 100644
--- a/pe-packer/pe-packer.cpp
+++ b/pe-packer/pe-packer.cpp
@@ -1,16 +1,90 @@
+#include <windows.h>
+#include <shellapi.h>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <ctime>
+#include <iostream>
+#include <memory>
+#include <sstream>
+#include <string>
+#include <vector>
+
 #include "core/core.hpp"
+#include "gui/gui_app.hpp"
 #include "utils/utils.hpp"
 
 c_core* packer = nullptr;
 
-int main(int argc, char* argv[])
-{
-    if (argc < 4) {
-        print_error("Invalid arguments");
+// using only on cli mode
+void ensure_cli() {
+    if (GetConsoleWindow() != nullptr) {
+        return;
     }
 
-    arguments::init(argc, argv);
+    auto hook_streams = []() {
+        FILE* fp = nullptr;
+        freopen_s(&fp, "CONOUT$", "w", stdout);
+        freopen_s(&fp, "CONOUT$", "w", stderr);
+        freopen_s(&fp, "CONIN$", "r", stdin);
+    };
 
+    if (AttachConsole(ATTACH_PARENT_PROCESS)) {
+        hook_streams();
+        return;
+    }
+
+    if (AllocConsole()) {
+        hook_streams();
+    }
+}
+
+int WINAPI wWinMain(HINSTANCE, HINSTANCE, PWSTR, int)
+{
+    int argc = 0;
+    LPWSTR* argvWide = CommandLineToArgvW(GetCommandLineW(), &argc);
+    if (!argvWide) {
+        return run_gui();
+    }
+
+    std::vector<std::string> args;
+    args.reserve(argc);
+    for (int i = 0; i < argc; ++i) {
+        int requiredSize = WideCharToMultiByte(CP_UTF8, 0, argvWide[i], -1, nullptr, 0, nullptr, nullptr);
+        std::string utf8(requiredSize, '\0');
+        WideCharToMultiByte(CP_UTF8, 0, argvWide[i], -1, utf8.data(), requiredSize, nullptr, nullptr);
+        utf8.pop_back();
+        args.push_back(std::move(utf8));
+    }
+    LocalFree(argvWide);
+
+    bool runGui = args.size() < 4;
+    if (!runGui) {
+        for (size_t i = 1; i < args.size(); ++i) {
+            if (args[i] == "--gui") {
+                runGui = true;
+                break;
+            }
+        }
+    }
+
+    if (runGui) {
+        HWND console = GetConsoleWindow();
+        if (console) {
+            ShowWindow(console, SW_HIDE);
+            FreeConsole();
+        }
+        return run_gui();
+    }
+
+    auto argv = std::make_unique<char*[]>(args.size());
+    for (size_t i = 0; i < args.size(); ++i) {
+        argv[i] = args[i].data();
+    }
+
+    arguments::init(static_cast<int>(args.size()), argv.get());
+
+    ensure_cli();
     enable_virtual_terminal_processing();
 
     time_t ctime = 0;
@@ -35,5 +109,6 @@ int main(int argc, char* argv[])
         return EXIT_FAILURE;
     }
 
-    return 0;
+    return EXIT_SUCCESS;
 }
+
diff --git a/pe-packer/pe-packer.vcxproj b/pe-packer/pe-packer.vcxproj
index 7b166e8..bdc8750 100644
--- a/pe-packer/pe-packer.vcxproj
+++ b/pe-packer/pe-packer.vcxproj
@@ -49,10 +49,12 @@
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>WIN32;ASMJIT_STATIC;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>$(ProjectDir)..\vendor\imgui;$(ProjectDir)..\vendor\imgui\backends;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies>d3d11.lib;dxgi.lib;d3dcompiler.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
@@ -66,13 +68,15 @@
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <LanguageStandard>stdcpp20</LanguageStandard>
+      <AdditionalIncludeDirectories>$(ProjectDir)..\vendor\imgui;$(ProjectDir)..\vendor\imgui\backends;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
-      <SubSystem>Console</SubSystem>
+      <SubSystem>Windows</SubSystem>
       <EnableCOMDATFolding>true</EnableCOMDATFolding>
       <OptimizeReferences>true</OptimizeReferences>
       <GenerateDebugInformation>false</GenerateDebugInformation>
       <RandomizedBaseAddress>true</RandomizedBaseAddress>
+      <AdditionalDependencies>d3d11.lib;dxgi.lib;d3dcompiler.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
@@ -177,6 +181,14 @@
     <ClCompile Include="pe_lib\version_info_editor.cpp" />
     <ClCompile Include="pe_lib\version_info_viewer.cpp" />
     <ClCompile Include="pe-packer.cpp" />
+    <ClCompile Include="gui\gui_app.cpp" />
+    <ClCompile Include="..\vendor\imgui\imgui.cpp" />
+    <ClCompile Include="..\vendor\imgui\imgui_demo.cpp" />
+    <ClCompile Include="..\vendor\imgui\imgui_draw.cpp" />
+    <ClCompile Include="..\vendor\imgui\imgui_tables.cpp" />
+    <ClCompile Include="..\vendor\imgui\imgui_widgets.cpp" />
+    <ClCompile Include="..\vendor\imgui\backends\imgui_impl_dx11.cpp" />
+    <ClCompile Include="..\vendor\imgui\backends\imgui_impl_win32.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="asmjit\src\asmjit\a64.h" />
@@ -321,6 +333,14 @@
     <ClInclude Include="pe_lib\version_info_types.h" />
     <ClInclude Include="pe_lib\version_info_viewer.h" />
     <ClInclude Include="utils\utils.hpp" />
+    <ClInclude Include="gui\gui_app.hpp" />
+    <ClInclude Include="..\vendor\imgui\imgui.h" />
+    <ClInclude Include="..\vendor\imgui\imgui_internal.h" />
+    <ClInclude Include="..\vendor\imgui\imstb_rectpack.h" />
+    <ClInclude Include="..\vendor\imgui\imstb_textedit.h" />
+    <ClInclude Include="..\vendor\imgui\imstb_truetype.h" />
+    <ClInclude Include="..\vendor\imgui\backends\imgui_impl_dx11.h" />
+    <ClInclude Include="..\vendor\imgui\backends\imgui_impl_win32.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
diff --git a/pe-packer/pe-packer.vcxproj.filters b/pe-packer/pe-packer.vcxproj.filters
index c7256e7..f492c0d 100644
--- a/pe-packer/pe-packer.vcxproj.filters
+++ b/pe-packer/pe-packer.vcxproj.filters
@@ -113,6 +113,30 @@
     <ClCompile Include="pe_lib\version_info_viewer.cpp">
       <Filter>pe_lib</Filter>
     </ClCompile>
+    <ClCompile Include="gui\gui_app.cpp">
+      <Filter>gui</Filter>
+    </ClCompile>
+    <ClCompile Include="..\vendor\imgui\imgui.cpp">
+      <Filter>external\imgui</Filter>
+    </ClCompile>
+    <ClCompile Include="..\vendor\imgui\imgui_demo.cpp">
+      <Filter>external\imgui</Filter>
+    </ClCompile>
+    <ClCompile Include="..\vendor\imgui\imgui_draw.cpp">
+      <Filter>external\imgui</Filter>
+    </ClCompile>
+    <ClCompile Include="..\vendor\imgui\imgui_tables.cpp">
+      <Filter>external\imgui</Filter>
+    </ClCompile>
+    <ClCompile Include="..\vendor\imgui\imgui_widgets.cpp">
+      <Filter>external\imgui</Filter>
+    </ClCompile>
+    <ClCompile Include="..\vendor\imgui\backends\imgui_impl_dx11.cpp">
+      <Filter>external\imgui</Filter>
+    </ClCompile>
+    <ClCompile Include="..\vendor\imgui\backends\imgui_impl_win32.cpp">
+      <Filter>external\imgui</Filter>
+    </ClCompile>
     <ClCompile Include="core\core.cpp">
       <Filter>core</Filter>
     </ClCompile>
@@ -328,6 +352,15 @@
     <Filter Include="asmjit\arm">
       <UniqueIdentifier>{58f80216-0243-4830-9429-a333fcb1247e}</UniqueIdentifier>
     </Filter>
+    <Filter Include="gui">
+      <UniqueIdentifier>{3b5dfb57-1686-46aa-9cad-b97cc1519e92}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="external">
+      <UniqueIdentifier>{fabae0e3-f392-43a5-8dbd-071d377b2f3c}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="external\imgui">
+      <UniqueIdentifier>{b8271a30-af6b-4fa7-9dcd-8d67076fa493}</UniqueIdentifier>
+    </Filter>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="pe_lib\entropy.h">
@@ -468,6 +501,30 @@
     <ClInclude Include="utils\utils.hpp">
       <Filter>utils</Filter>
     </ClInclude>
+    <ClInclude Include="gui\gui_app.hpp">
+      <Filter>gui</Filter>
+    </ClInclude>
+    <ClInclude Include="..\vendor\imgui\imgui.h">
+      <Filter>external\imgui</Filter>
+    </ClInclude>
+    <ClInclude Include="..\vendor\imgui\imgui_internal.h">
+      <Filter>external\imgui</Filter>
+    </ClInclude>
+    <ClInclude Include="..\vendor\imgui\imstb_rectpack.h">
+      <Filter>external\imgui</Filter>
+    </ClInclude>
+    <ClInclude Include="..\vendor\imgui\imstb_textedit.h">
+      <Filter>external\imgui</Filter>
+    </ClInclude>
+    <ClInclude Include="..\vendor\imgui\imstb_truetype.h">
+      <Filter>external\imgui</Filter>
+    </ClInclude>
+    <ClInclude Include="..\vendor\imgui\backends\imgui_impl_dx11.h">
+      <Filter>external\imgui</Filter>
+    </ClInclude>
+    <ClInclude Include="..\vendor\imgui\backends\imgui_impl_win32.h">
+      <Filter>external\imgui</Filter>
+    </ClInclude>
     <ClInclude Include="core\mba.hpp">
       <Filter>core</Filter>
     </ClInclude>