diff --git a/app_settings.py b/app_settings.py
new file mode 100644
index 0000000..64ce149
--- /dev/null
+++ b/app_settings.py
@@ -0,0 +1,8 @@
+# app geometry
+height = 100
+length = 370
+# background color
+background_color = 'white'
+# bitrate massive - for more info see "moviepy.editor.VideoFileClip.write_videofile"
+bitrate = ['500k', '1000k', '5000k', '7000k', '10000k', '20000k', '30000k', '40000k', '50000k']
+
diff --git a/convert.py b/convert.py
new file mode 100644
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--- /dev/null
+++ b/convert.py
@@ -0,0 +1,68 @@
+# necessary libraries
+from moviepy.editor import VideoFileClip
+import os
+import glob
+import sys
+# import bitrate to check the entry bitrate val
+from app_settings import bitrate
+
+# dicts for return value through messagebox
+error_dict = {'en': 'Error', 'ru': 'Ошибка'}
+info_dict = {'en': 'Conversion if finished', 'ru': 'Конец конвертации'}
+path_dict = {'en': 'No path is provided in the main field', 'ru': 'В поле ввода не указан путь'}
+no_folder_dict = {'en': 'This folder does not exist, or there are no AVI files in it', 'ru': 'Данной папки нет, либо в ней нет AVI файлов'}
+bitrate_is_wrong_dict = {'en': 'Bitrate value is not taken from the list', 'ru': 'Значение битрейта взято не из списка'}
+good_convert_dict = {'en': 'Conversion of all videos was successful', 'ru': 'Конвертация всех видео прошла успешно'}
+bad_convert_dict = {'en': 'Conversion of not all videos was successful.\nFor details, see the file: ', 'ru': 'Конвертация не всех видео прошла успешно.\nДля деталей смотри файл: '}
+
+# dicts for file and folders name
+output_file_name_dict = {'en': 'output', 'ru': 'инфо'}
+folder_mp4_name_dict = {'en': 'mp4_files', 'ru': 'mp4_видео'}
+
+# main function to convert avi videos to mp4 videos using codec='libx265'
+def convert_avi_to_mp4(path, bitrate_val, language):
+    # input error checking
+    if path == '':
+        _error_ = True
+        return _error_, error_dict[language], path_dict[language]
+    if bitrate_val not in bitrate:
+        _error_ = True
+        return _error_, error_dict[language], bitrate_is_wrong_dict[language]
+
+    # massive of all avi files
+    files = glob.glob(path + '//' + '*.avi')
+
+    # if no avi files than raise error
+    if len(files) == 0:
+        _error_ = True
+        return _error_, error_dict[language], no_folder_dict[language]
+
+    # this txt file is essential for convert. VideoFileClip can not work without it
+    output = open(path + '//' + output_file_name_dict[language] + '.txt', 'wt')
+    sys.stdout = output
+    sys.stderr = output
+
+    # create a subfolder for mp4 files.
+    path_folder_mp4 = path + '//' + folder_mp4_name_dict[language]
+    os.makedirs(path_folder_mp4, exist_ok=True)
+
+    # massive of file names that have not been converted
+    missed_convert_files = False
+    # convert each video and save it to the created folder
+    for i in files:
+        try:
+            clip = VideoFileClip(i)
+            clip.write_videofile(path_folder_mp4 + '\\' + str(i.split('\\')[-1][:-3]) + 'mp4', codec='libx265',
+                                 bitrate=bitrate_val)
+        except Exception:
+            missed_convert_files = True
+
+    # closing the txt file
+    output.close()
+
+    # output message
+    _error_ = False
+    if missed_convert_files:
+        return _error_, info_dict[language], bad_convert_dict[language] + output_file_name_dict[language] + '.txt'
+    else:
+        return _error_, info_dict[language], good_convert_dict[language]
\ No newline at end of file
diff --git a/logo.ico b/logo.ico
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index 0000000..a3687b6
Binary files /dev/null and b/logo.ico differ
diff --git a/requirements.txt b/requirements.txt
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index 0000000..07a1f17
Binary files /dev/null and b/requirements.txt differ
diff --git a/tkinker_app.py b/tkinker_app.py
new file mode 100644
index 0000000..12619e6
--- /dev/null
+++ b/tkinker_app.py
@@ -0,0 +1,129 @@
+# for the tkinter application
+import tkinter as tk
+from tkinter import *
+from tkinter import ttk
+from tkinter import messagebox
+import ctypes
+# we need 'Path' for the exe file only
+from pathlib import Path
+# main function to convert avi videos to mp4 videos using codec='libx265'
+from convert import convert_avi_to_mp4
+# appearance settings
+from app_settings import *
+
+
+class App(tk.Tk):
+    def __init__(self, *args, **kwargs):
+        tk.Tk.__init__(self, *args, **kwargs)
+
+        ##############
+        # icon of the app in the app window -- we use Path(__file__) only for the exe file
+        self.iconbitmap(Path(__file__).parent / 'logo.ico')
+        # Set the icon for the taskbar
+        ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID('convertor')
+        self.set_taskbar_icon('logo.ico')  # see 'set_taskbar_icon' function
+        ##############
+
+        # app title
+        self.title('Конвертация видео из AVI в MP4')
+
+        #########
+        # geometry of the app
+        #########
+        self.geometry(str(length) + 'x' + str(height))  # see app_settings.py
+        self.minsize(length, height)  # see app_settings.py
+        self.resizable(True, False)  # allow the window to be resizable only alongside the 'x' direction
+        # make sure that our columns have the weight
+        self.columnconfigure(0, weight=1)  # Make column 0 resizable
+        self.columnconfigure(1, weight=1)  # Make column 1 resizable
+        self.columnconfigure(2, weight=1)  # Make column 2 resizable
+        self.rowconfigure(0, weight=1)  # Make row 0 resizable
+        self.rowconfigure(1, weight=1)  # Make row 1 resizable
+        self.rowconfigure(3, weight=1)  # Make row 3 resizable
+
+        # color of the background
+        self['bg'] = background_color  # see app_settings.py
+
+        #########
+        # elements of an app
+        #########
+        # main label
+        self.main_label = Label(self, text='Введите путь до папки с файлами AVI', font=('Arial', 14),
+                                background=background_color)
+        self.main_label.grid(row=0, column=0, columnspan=4, padx=5, pady=5, sticky='ew')
+
+        # area for the entry path
+        self.path_for_folder_of_avi_files = Entry(self, background=background_color)
+        self.path_for_folder_of_avi_files.grid(row=1, column=0, columnspan=4, ipadx=100, padx=5, pady=5, sticky='ew')
+
+        # bitrate label
+        self.bitrate_label = Label(self, text='Битрейт', background=background_color)
+        self.bitrate_label.grid(row=3, column=0, padx=5, pady=5)
+
+        # bitrate variable - see app_settings.py to find bitrate massive
+        self.bitrate_var = StringVar(value=bitrate[3])
+        # bitrate combobox
+        self.bitrate_combobox = ttk.Combobox(self, textvariable=self.bitrate_var, values=bitrate,
+                                             background=background_color)
+        self.bitrate_combobox.grid(row=3, column=1, padx=5, pady=5, sticky='ew')
+
+        # button to evaluate the 'convert_avi_to_mp4' function
+        self.button = tk.Button(self, text='Конвертировать', width=15, command=self.button_clicked,
+                                background=background_color)
+        self.button.grid(row=3, column=2, padx=5, pady=5)
+        #########
+        # to make ctrl-c and ctrl-v work in Russian
+        #########
+        self.language = 'ru'  # Default language is Russian
+        self.main_label.bind('<Button-1>', self.switch_language)  # pressing main_label switches the language
+        self.bind_all('<Key>', self.add_ctrl_v_and_c_to_the_russian, '+')
+
+    # function "convert_avi_to_mp4" (see convert.py) is called to convert avi files to mp4 files
+    def button_clicked(self):
+        message = convert_avi_to_mp4(self.path_for_folder_of_avi_files.get(), self.bitrate_combobox.get(),
+                                     self.language)
+        if message[0]:  # this is the _error_(True or False)
+            messagebox.showerror(message[1], message[2])
+        else:
+            messagebox.showinfo(message[1], message[2])
+
+    # function to switch the language if there was a click on the upper label, i.e., 'main_label'
+    def switch_language(self, event):
+        if self.language == 'ru':
+            self.title('Convert video from AVI to MP4')
+            self.main_label['text'] = 'Enter the path to the AVI folder'
+            self.bitrate_label['text'] = 'Bitrate'
+            self.button['text'] = 'Convert'
+            self.language = 'en'
+        else:
+            self.title('Конвертация видео из AVI в MP4')
+            self.main_label['text'] = 'Введите путь до папки с файлами AVI'
+            self.bitrate_label['text'] = 'Битрейт'
+            self.button['text'] = 'Конвертировать'
+            self.language = 'ru'
+
+    # function to make ctrl-c and ctrl-v work in Russian
+    @staticmethod
+    def add_ctrl_v_and_c_to_the_russian(event):
+        ctrl = (event.state & 0x4) != 0
+        if event.keycode == 88 and ctrl and event.keysym.lower() != 'x':
+            event.widget.event_generate('<<Cut>>')
+
+        if event.keycode == 86 and ctrl and event.keysym.lower() != 'v':
+            event.widget.event_generate('<<Paste>>')
+
+        if event.keycode == 67 and ctrl and event.keysym.lower() != 'c':
+            event.widget.event_generate('<<Copy>>')
+
+    #  setting taskbar icon
+    def set_taskbar_icon(self, icon_path):
+        try:
+            import winreg
+        except ImportError:
+            import _winreg as winreg
+
+        key = winreg.CreateKey(winreg.HKEY_CURRENT_USER,
+                               "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Taskband")
+        winreg.SetValueEx(key, "IconPath", 0, winreg.REG_SZ, icon_path)
+        winreg.SetValueEx(key, "IconIndex", 0, winreg.REG_DWORD, 0)
+        winreg.CloseKey(key)