diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index fbafbc6..6487079 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -28,6 +28,19 @@ set_directory_properties(PROPERTIES CORRADE_USE_PEDANTIC_FLAGS ON)
 
 corrade_add_resource(Assets assets.conf)
 
+add_library(Logger STATIC EXCLUDE_FROM_ALL
+    Logger/Logger.h
+    Logger/Logger.cpp
+    Logger/EntryType.h
+    Logger/MagnumLogBuffer.h
+    Logger/MagnumLogBuffer.cpp
+)
+
+target_link_libraries(Logger PRIVATE
+    Corrade::Utility
+    Magnum::Magnum
+)
+
 add_library(UESaveFile STATIC EXCLUDE_FROM_ALL
     UESaveFile/Serialisers/AbstractUnrealCollectionPropertySerialiser.h
     UESaveFile/Serialisers/AbstractUnrealPropertySerialiser.h
@@ -108,6 +121,7 @@ target_link_libraries(UESaveFile PRIVATE
     Corrade::Containers
     Corrade::Utility
     Magnum::Magnum
+    Logger
 )
 
 add_executable(MassBuilderSaveTool WIN32
@@ -196,6 +210,7 @@ target_link_libraries(MassBuilderSaveTool PRIVATE
     Magnum::GL
     Magnum::Sdl2Application
     MagnumIntegration::ImGui
+    Logger
     UESaveFile
     efsw
     zip
diff --git a/src/Logger/EntryType.h b/src/Logger/EntryType.h
new file mode 100644
index 0000000..ac34d5c
--- /dev/null
+++ b/src/Logger/EntryType.h
@@ -0,0 +1,23 @@
+#pragma once
+
+// MassBuilderSaveTool
+// Copyright (C) 2021-2022 Guillaume Jacquemin
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+enum class EntryType {
+    Info,
+    Warning,
+    Error,
+};
diff --git a/src/Logger/Logger.cpp b/src/Logger/Logger.cpp
new file mode 100644
index 0000000..6715886
--- /dev/null
+++ b/src/Logger/Logger.cpp
@@ -0,0 +1,118 @@
+// MassBuilderSaveTool
+// Copyright (C) 2021-2022 Guillaume Jacquemin
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifdef SAVETOOL_DEBUG_BUILD
+#include <iostream>
+#endif
+#include <mutex>
+
+#include <Corrade/Containers/GrowableArray.h>
+#include <Corrade/Utility/Debug.h>
+
+#include <Magnum/Types.h>
+
+#include "Logger.h"
+
+using Containers::Array;
+using Utility::Debug;
+using Utility::Warning;
+using Utility::Error;
+
+using namespace Magnum;
+
+Logger&
+Logger::instance() {
+    static Logger logger;
+    return logger;
+}
+
+void
+Logger::initialise() {
+#ifndef SAVETOOL_DEBUG_BUILD
+    _logFile.open("SaveToolLog.txt", std::ios::trunc);
+    _logFile << "In case you encounter a bug:\n" <<
+                "1. Do not run the Save Tool again, as this log will be cleared.\n" <<
+                "2. Go to either the official Sekai Project Discord guild, or the community M.A.S.S. Builder one.\n" <<
+                "3. Mention me (William JCM#2301) to get my attention, with a description of the bug.\n"
+                "   Please include as many details as possible, I don't want to play \"20 questions\", and neither do you.\n" <<
+                "4. Send me this file _when I ask for it_, preferably in DMs.\n" <<
+                std::endl;
+#endif
+}
+
+void
+Logger::indent() {
+    _indentLevel++;
+}
+
+void
+Logger::unindent() {
+    if(_indentLevel > 0) {
+        _indentLevel--;
+    }
+}
+
+void
+Logger::log(EntryType type, StringView location, StringView message) {
+    Debug d{
+        #ifndef SAVETOOL_DEBUG_BUILD
+        &_logFile
+        #else
+        &std::cout
+        #endif
+    };
+
+    #ifdef SAVETOOL_DEBUG_BUILD
+    #define COLOURED_TEXT(colour, text) Debug::color(Debug::Color::colour) << (text) << Debug::resetColor
+    #else
+    #define COLOURED_TEXT(colour, text) (text)
+    #endif
+    switch(type) {
+        case EntryType::Info:
+            d << COLOURED_TEXT(Default, "[   INFO]"_s);
+            break;
+        case EntryType::Warning:
+            d << COLOURED_TEXT(Yellow, "[WARNING]"_s);
+            break;
+        case EntryType::Error:
+            d << COLOURED_TEXT(Red, "[  ERROR]"_s);
+            break;
+    }
+    #undef COLOURED_TEXT
+
+    d << "["_s << Debug::nospace << location << Debug::nospace << "]";
+
+    for(UnsignedInt i = 0; i < _indentLevel; i++) {
+        d << Debug::nospace << "    "_s << Debug::nospace;
+    }
+
+    d << ((message.back() == '\n') ? message.exceptSuffix(1) : message);
+}
+
+void
+Logger::lockMutex() {
+    _logMutex.lock();
+}
+
+void
+Logger::unlockMutex() {
+    _logMutex.unlock();
+}
+
+Logger&
+logger() {
+    return Logger::instance();
+}
diff --git a/src/Logger/Logger.h b/src/Logger/Logger.h
new file mode 100644
index 0000000..75d0f2d
--- /dev/null
+++ b/src/Logger/Logger.h
@@ -0,0 +1,88 @@
+#pragma once
+
+// MassBuilderSaveTool
+// Copyright (C) 2021-2022 Guillaume Jacquemin
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include <ctime>
+
+#include <mutex>
+#include <fstream>
+
+#include <Corrade/Containers/String.h>
+#include <Corrade/Containers/ArrayView.h>
+#include <Corrade/Utility/Format.h>
+
+#include <Magnum/Types.h>
+
+#include "EntryType.h"
+
+using namespace Corrade;
+
+using Containers::ArrayView;
+using Containers::String;
+using Containers::StringView;
+
+using namespace Magnum;
+
+using namespace Containers::Literals;
+
+class Logger {
+    public:
+        Logger(const Logger&) = delete;
+        Logger& operator=(const Logger&) = delete;
+
+        Logger(Logger&&) = delete;
+        Logger& operator=(Logger&&) = delete;
+
+        static auto instance() -> Logger&;
+
+        void initialise();
+
+        void indent();
+        void unindent();
+
+        void log(EntryType type, StringView location, StringView message);
+
+        void lockMutex();
+        void unlockMutex();
+
+    private:
+        Logger() = default;
+
+        #ifndef SAVETOOL_DEBUG_BUILD
+        std::ofstream _logFile;
+        #endif
+
+        UnsignedInt _indentLevel = 0;
+
+        std::mutex _logMutex{};
+};
+
+auto logger() -> Logger&;
+
+#define LOG(entry_type, message) logger().lockMutex(); \
+                                 logger().log(EntryType::entry_type, \
+                                              Utility::format("{}:{}", StringView{__builtin_FILE()}.find("src"_s).data() + 4, __builtin_LINE()), \
+                                              message); \
+                                 logger().unlockMutex()
+
+#define LOG_INFO(message) LOG(Info, message)
+#define LOG_WARNING(message) LOG(Warning, message)
+#define LOG_ERROR(message) LOG(Error, message)
+
+#define LOG_INFO_FORMAT(message, ...) LOG_INFO(Utility::format(message, __VA_ARGS__))
+#define LOG_WARNING_FORMAT(message, ...) LOG_WARNING(Utility::format(message, __VA_ARGS__))
+#define LOG_ERROR_FORMAT(message, ...) LOG_ERROR(Utility::format(message, __VA_ARGS__))
diff --git a/src/Logger/MagnumLogBuffer.cpp b/src/Logger/MagnumLogBuffer.cpp
new file mode 100644
index 0000000..e2e3df9
--- /dev/null
+++ b/src/Logger/MagnumLogBuffer.cpp
@@ -0,0 +1,30 @@
+// MassBuilderSaveTool
+// Copyright (C) 2021-2022 Guillaume Jacquemin
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "MagnumLogBuffer.h"
+
+MagnumLogBuffer::MagnumLogBuffer(EntryType type): std::stringbuf(std::ios_base::out), _type{type} {}
+
+MagnumLogBuffer::~MagnumLogBuffer() = default;
+
+int
+MagnumLogBuffer::sync() {
+    logger().lockMutex();
+    logger().log(_type, "Corrade/Magnum"_s, str().c_str());
+    logger().unlockMutex();
+    str({});
+    return 0;
+}
diff --git a/src/Logger/MagnumLogBuffer.h b/src/Logger/MagnumLogBuffer.h
new file mode 100644
index 0000000..ea7888c
--- /dev/null
+++ b/src/Logger/MagnumLogBuffer.h
@@ -0,0 +1,34 @@
+#pragma once
+
+// MassBuilderSaveTool
+// Copyright (C) 2021-2022 Guillaume Jacquemin
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include <sstream>
+
+#include "Logger.h"
+
+#include "EntryType.h"
+
+class MagnumLogBuffer : public std::stringbuf {
+    public:
+        explicit MagnumLogBuffer(EntryType type);
+        ~MagnumLogBuffer();
+
+    private:
+        int sync() override;
+
+        EntryType _type;
+};