diff --git a/Telegram/Resources/default_kotato-settings-custom.json b/Telegram/Resources/default_kotato-settings-custom.json
new file mode 100644
index 000000000..46fa536b5
--- /dev/null
+++ b/Telegram/Resources/default_kotato-settings-custom.json
@@ -0,0 +1,11 @@
+// This is a list of your own settings for Kotatogram Desktop
+// You can see full list of settings in the 'kotato-settings-default.json' file
+
+{
+	// "fonts": {
+	//	   "main": "Open Sans",
+	//	   "semibold": "Open Sans Semibold",
+	//	   "semibold_is_bold": false,
+	//	   "monospaced": "Consolas"
+	// }
+}
diff --git a/Telegram/Resources/qrc/telegram/telegram.qrc b/Telegram/Resources/qrc/telegram/telegram.qrc
index 87ee77587..25ab0b68a 100644
--- a/Telegram/Resources/qrc/telegram/telegram.qrc
+++ b/Telegram/Resources/qrc/telegram/telegram.qrc
@@ -56,5 +56,6 @@
   </qresource>
   <qresource prefix="/misc">
     <file alias="default_shortcuts-custom.json">../../default_shortcuts-custom.json</file>
+    <file alias="default_kotato-settings-custom.json">../../default_kotato-settings-custom.json</file>
   </qresource>
 </RCC>
diff --git a/Telegram/SourceFiles/core/application.cpp b/Telegram/SourceFiles/core/application.cpp
index 74454a300..e3d24bfa5 100644
--- a/Telegram/SourceFiles/core/application.cpp
+++ b/Telegram/SourceFiles/core/application.cpp
@@ -19,6 +19,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "core/sandbox.h"
 #include "core/local_url_handlers.h"
 #include "core/launcher.h"
+#include "core/kotato_settings.h"
 #include "core/core_ui_integration.h"
 #include "chat_helpers/emoji_keywords.h"
 #include "storage/localstorage.h"
@@ -157,10 +158,12 @@ Application::~Application() {
 	Global::finish();
 	ThirdParty::finish();
 
+	KotatoSettings::Finish();
 	Instance = nullptr;
 }
 
 void Application::run() {
+	KotatoSettings::Start();
 	if (!cMainFont().isEmpty()) {
 		style::internal::SetMainFont(cMainFont());
 	}
diff --git a/Telegram/SourceFiles/core/kotato_settings.cpp b/Telegram/SourceFiles/core/kotato_settings.cpp
new file mode 100644
index 000000000..237cffd7e
--- /dev/null
+++ b/Telegram/SourceFiles/core/kotato_settings.cpp
@@ -0,0 +1,205 @@
+/*
+This file is part of Kotatogram Desktop,
+the unofficial app based on Telegram Desktop.
+
+For license and copyright information please follow this link:
+https://github.com/kotatogram/kotatogram-desktop/blob/dev/LEGAL
+*/
+#include "core/kotato_settings.h"
+
+#include "mainwindow.h"
+#include "mainwidget.h"
+#include "window/window_controller.h"
+#include "core/application.h"
+#include "base/parse_helper.h"
+#include "facades.h"
+
+#include <QtCore/QJsonDocument>
+#include <QtCore/QJsonObject>
+#include <QtCore/QJsonArray>
+
+namespace KotatoSettings {
+namespace {
+
+class Manager {
+public:
+	void fill();
+	void clear();
+
+	const QStringList &errors() const;
+
+private:
+	void writeDefaultFile();
+	bool readCustomFile();
+
+	QStringList _errors;
+
+};
+
+QString DefaultFilePath() {
+	return cWorkingDir() + qsl("tdata/kotato-settings-default.json");
+}
+
+QString CustomFilePath() {
+	return cWorkingDir() + qsl("tdata/kotato-settings-custom.json");
+}
+
+bool DefaultFileIsValid() {
+	QFile file(DefaultFilePath());
+	if (!file.open(QIODevice::ReadOnly)) {
+		return false;
+	}
+	auto error = QJsonParseError{ 0, QJsonParseError::NoError };
+	const auto document = QJsonDocument::fromJson(
+		base::parse::stripComments(file.readAll()),
+		&error);
+	file.close();
+
+	if (error.error != QJsonParseError::NoError || !document.isObject()) {
+		return false;
+	}
+	const auto settings = document.object();
+
+	const auto version = settings.constFind(qsl("version"));
+	if (version == settings.constEnd() || (*version).toInt() != AppKotatoVersion) {
+		return false;
+	}
+
+	return true;
+}
+
+void WriteDefaultCustomFile() {
+	const auto path = CustomFilePath();
+	auto input = QFile(":/misc/default_kotato-settings-custom.json");
+	auto output = QFile(path);
+	if (input.open(QIODevice::ReadOnly) && output.open(QIODevice::WriteOnly)) {
+		output.write(input.readAll());
+	}
+}
+
+void Manager::fill() {
+	if (!DefaultFileIsValid()) {
+		writeDefaultFile();
+	}
+	if (!readCustomFile()) {
+		WriteDefaultCustomFile();
+	}
+}
+
+void Manager::clear() {
+	_errors.clear();
+}
+
+const QStringList &Manager::errors() const {
+	return _errors;
+}
+
+bool Manager::readCustomFile() {
+	QFile file(CustomFilePath());
+	if (!file.exists()) {
+		return false;
+	}
+	const auto guard = gsl::finally([&] {
+		if (!_errors.isEmpty()) {
+			_errors.push_front(qsl("While reading file '%1'..."
+			).arg(file.fileName()));
+		}
+	});
+	if (!file.open(QIODevice::ReadOnly)) {
+		_errors.push_back(qsl("Could not read the file!"));
+		return true;
+	}
+	auto error = QJsonParseError{ 0, QJsonParseError::NoError };
+	const auto document = QJsonDocument::fromJson(
+		base::parse::stripComments(file.readAll()),
+		&error);
+	file.close();
+
+	if (error.error != QJsonParseError::NoError) {
+		_errors.push_back(qsl("Failed to parse! Error: %2"
+		).arg(error.errorString()));
+		return true;
+	} else if (!document.isObject()) {
+		_errors.push_back(qsl("Failed to parse! Error: object expected"));
+		return true;
+	}
+	const auto settings = document.object();
+
+	if (settings.isEmpty()) {
+		return true;
+	}
+
+	const auto settingsFontsIterator = settings.constFind(qsl("fonts"));
+
+	if (settingsFontsIterator != settings.constEnd() && (*settingsFontsIterator).isObject()) {
+		const auto settingsFonts = (*settingsFontsIterator).toObject();
+
+		const auto settingsFontsMain = settingsFonts.constFind(qsl("main"));
+		if (settingsFontsMain != settingsFonts.constEnd() && (*settingsFontsMain).isString()) {
+			cSetMainFont((*settingsFontsMain).toString());
+		}
+
+		const auto settingsFontsSemibold = settingsFonts.constFind(qsl("semibold"));
+		if (settingsFontsSemibold != settingsFonts.constEnd() && (*settingsFontsSemibold).isString()) {
+			cSetSemiboldFont((*settingsFontsSemibold).toString());
+		}
+
+		const auto settingsFontsSemiboldIsBold = settingsFonts.constFind(qsl("semibold_is_bold"));
+		if (settingsFontsSemiboldIsBold != settingsFonts.constEnd() && (*settingsFontsSemiboldIsBold).isBool()) {
+			cSetSemiboldFontIsBold((*settingsFontsSemiboldIsBold).toBool());
+		}
+
+		const auto settingsFontsMonospace = settingsFonts.constFind(qsl("monospaced"));
+		if (settingsFontsMonospace != settingsFonts.constEnd() && (*settingsFontsMonospace).isString()) {
+			cSetMonospaceFont((*settingsFontsMonospace).toString());
+		}
+	}
+	return true;
+}
+
+void Manager::writeDefaultFile() {
+	auto file = QFile(DefaultFilePath());
+	if (!file.open(QIODevice::WriteOnly)) {
+		return;
+	}
+	const char *defaultHeader = R"HEADER(
+// This is a list of default options for Kotatogram Desktop
+// Please don't modify it, its content is not used in any way
+// You can place your own options in the 'kotato-settings-custom.json' file
+
+)HEADER";
+	file.write(defaultHeader);
+
+	auto settings = QJsonObject();
+	settings.insert(qsl("version"), QString::number(AppKotatoVersion));
+
+	auto settingsFonts = QJsonObject();
+	settingsFonts.insert(qsl("main"), qsl("Open Sans"));
+	settingsFonts.insert(qsl("semibold"), qsl("Open Sans Semibold"));
+	settingsFonts.insert(qsl("semibold_is_bold"), false);
+	settingsFonts.insert(qsl("monospaced"), qsl("Consolas"));
+
+	settings.insert(qsl("fonts"), settingsFonts);
+
+	auto document = QJsonDocument();
+	document.setObject(settings);
+	file.write(document.toJson(QJsonDocument::Indented));
+}
+
+Manager Data;
+
+} // namespace
+
+void Start() {
+	Data.fill();
+}
+
+const QStringList &Errors() {
+	return Data.errors();
+}
+
+void Finish() {
+	Data.clear();
+}
+
+} // namespace KotatoSettings
diff --git a/Telegram/SourceFiles/core/kotato_settings.h b/Telegram/SourceFiles/core/kotato_settings.h
new file mode 100644
index 000000000..84cffc5e2
--- /dev/null
+++ b/Telegram/SourceFiles/core/kotato_settings.h
@@ -0,0 +1,17 @@
+/*
+This file is part of Kotatogram Desktop,
+the unofficial app based on Telegram Desktop.
+
+For license and copyright information please follow this link:
+https://github.com/kotatogram/kotatogram-desktop/blob/dev/LEGAL
+*/
+#pragma once
+
+namespace KotatoSettings {
+
+void Start();
+void Finish();
+
+const QStringList &Errors();
+
+} // namespace KotatoSettings
diff --git a/Telegram/gyp/telegram/sources.txt b/Telegram/gyp/telegram/sources.txt
index 38d9d0e64..143adcca5 100644
--- a/Telegram/gyp/telegram/sources.txt
+++ b/Telegram/gyp/telegram/sources.txt
@@ -157,6 +157,8 @@
 <(src_loc)/core/event_filter.h
 <(src_loc)/core/file_utilities.cpp
 <(src_loc)/core/file_utilities.h
+<(src_loc)/core/kotato_settings.cpp
+<(src_loc)/core/kotato_settings.h
 <(src_loc)/core/launcher.cpp
 <(src_loc)/core/launcher.h
 <(src_loc)/core/local_url_handlers.cpp