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ByJordan Brown

YouTube is the world‘s most popular video sharing platform with billions of videos available to watch on nearly any topic imaginable. While primarily designed for streaming, there are many reasons you might want to download YouTube videos for offline viewing – for example, if you have a slow or unreliable internet connection, will be traveling to an area with limited connectivity, or simply want to archive a favorite video before it gets taken down.

In this tutorial, we‘ll walk through how to build your own basic YouTube video downloader application using Python. With just a few dozen lines of code, you‘ll be able to download individual videos, entire playlists, or even all the videos from a channel. We‘ll also add options for downloading only the audio track or video without audio.

Let‘s get started!

What You‘ll Need

The two main Python libraries we‘ll be using are:

  1. pytube – for parsing YouTube URLs and downloading the video content
  2. tkinter – for building a simple graphical user interface (GUI) to make the downloader easy to use

You can install pytube with pip:

pip install pytube

tkinter comes pre-installed with Python, so you shouldn‘t need to install it separately.

We‘ll also use Python‘s built-in os and sys libraries for interacting with the operating system and retrieving command-line arguments.

Downloading Individual Videos

Let‘s start by writing a function to download a single YouTube video when given its URL. We‘ll use pytube to handle all the heavy lifting:

from pytube import YouTube

def download_video(url):
try:
yt = YouTube(url)
print(f"Downloading: {yt.title}")


stream = yt.streams.get_highest_resolution()
stream.download()

print("Video downloaded successfully!")


except Exception as e:

print(f"An error occurred: {e}")


This function takes a YouTube video URL as a parameter. It creates a YouTube object, retrieves the video‘s title for display purposes, then grabs the video stream with the highest available resolution and downloads it to the current directory. Basic error handling is included to catch any issues that may arise.


You can call this function and pass it a valid YouTube URL to download that video:


download_video("https://www.youtube.com/watch?v=dQw4w9WgXcQ")



Downloading Playlists and Channels


Downloading an individual video is straightforward, but what if you want to grab an entire playlist or download all videos from a channel? pytube makes this easy too.


Here‘s a function to download a YouTube playlist:


from pytube import Playlist

def download_playlist(url):
try:
playlist = Playlist(url)
print(f"Downloading: {playlist.title}")


for video in playlist.videos:
  print(f"Downloading: {video.title}")
  video.streams.get_highest_resolution().download()

print("Playlist downloaded successfully!")  


except Exception as e:

print(f"An error occurred: {e}")


The process is similar to downloading a single video. We create a Playlist object from the URL, then iterate through all the videos it contains, downloading each one at the best available quality.


Downloading an entire channel works much the same way:


from pytube import Channel

def download_channel(url):
try:
channel = Channel(url)
print(f"Downloading videos from {channel.channel_name}")


for video in channel.videos:
  print(f"Downloading: {video.title}")
  video.streams.get_highest_resolution().download() 


print(f"Channel videos downloaded successfully!")

except Exception as e:

print(f"An error occurred: {e}")


Call these functions with a playlist or channel URL to download all the videos they contain:


download_playlist("https://www.youtube.com/playlist?list=PL8A83A276F0D85E77")
download_channel("https://www.youtube.com/user/YouTubeCreators")  



Audio-Only and Video-Only Downloads


In some cases, you may only want to download the audio track from a YouTube video, such as if you just want to save a music video as an MP3 for listening. Or you might want to download the video without any audio. 


pytube lets you filter the available streams to get just what you need. Here are a couple helper functions to handle that:


def download_audio(url):
  try:
    yt = YouTube(url) 
    print(f"Downloading audio: {yt.title}")

stream = yt.streams.filter(only_audio=True).first()
stream.download()

print("Audio downloaded successfully!")


except Exception as e:

print(f"An error occurred: {e}")


def download_video_only(url):

try:

yt = YouTube(url)

print(f"Downloading video: {yt.title}") 


stream = yt.streams.filter(only_video=True).get_highest_resolution()
stream.download()

print("Video-only downloaded successfully!")


except Exception as e:

print(f"An error occurred: {e}")  


The download_audio function grabs the first stream that contains only an audio track. The download_video_only function filters for only video streams and selects the one with the best resolution.


Building a Simple GUI


We now have functions to handle downloading YouTube videos in a few different ways. Let‘s make them easier to use by building a basic GUI with tkinter. This will let the user simply paste in a URL, select some options, and click a button to perform the download.


Here‘s the code for a minimal downloader GUI:


import tkinter as tk
from tkinter import ttk

def download_clicked():
url = url_entry.get()


if audio_only.get():
download_audio(url)
elif video_only.get():
download_video_only(url)

elif download_type.get() == "Video":
download_video(url)
elif download_type.get() == "Playlist":

download_playlist(url)
elif download_type.get() == "Channel":
download_channel(url)



root = tk.Tk()
root.title("YouTube Downloader")
root.geometry("300x200")



url_label = ttk.Label(root, text="URL:")
url_label.pack()
url_entry = ttk.Entry(root)
url_entry.pack()



download_type = tk.StringVar()
download_type_choices = ("Video", "Playlist", "Channel")

download_type.set("Video")
type_dropdown = ttk.OptionMenu(root, download_type, *download_type_choices)
type_dropdown.pack()



audio_only = tk.BooleanVar()

audio_check = ttk.Checkbutton(root, text="Audio only", variable=audio_only)
audio_check.pack()


video_only = tk.BooleanVar()
video_check = ttk.Checkbutton(root, text="Video only (no audio)", variable=video_only)

video_check.pack()



download_button = ttk.Button(root, text="Download", command=download_clicked)
download_button.pack()


root.mainloop()




This sets up a small window with a field to enter the YouTube URL, a dropdown to select whether you want to download a single video, playlist, or channel, and a couple checkboxes for audio-only or video-only downloads.


When the "Download" button is clicked, it checks which options are selected and calls the appropriate function to start the download process. Errors will be printed to the console.


The GUI isn‘t fancy, but it provides an easy interface for our downloader functionality. Feel free to expand on it!


Legal and Ethical Considerations


Before you go off and start downloading terabytes of YouTube videos, there are some important things to keep in mind:


    

  1. 

    Downloading YouTube videos may violate the YouTube Terms of Service, even if you‘re only downloading videos for personal use. 
    

    2. 

  2. 

    Selling or redistributing videos you download, unless you have explicit permission from the copyright owner, is illegal in most jurisdictions.
    

    3. 

  3. 

    Use your downloader responsibly. Don‘t download videos you haven‘t been given the right to save or reproduce.
    

    4. 



Building the tool is fine, but be aware of how you use it and respect intellectual property rights.


Ideas for Improvements


We‘ve built a basic but functional YouTube downloader in a relatively small amount of Python code. There are a number of ways you could expand on it:


    

  • Add support for downloading captions/subtitles along with the video
    • 

  • Let the user choose the resolution to download rather than always grabbing the highest available  
    • 

  • Implement playlist/channel downloading in the GUI
    • 

  • Automatically convert downloaded videos to other formats like MP3
    • 

  • Integrate a library like moviepy for basic video editing capabilities
    • 

  • Add a progress bar and cancel button for long-running downloads
    • 



The possibilities are endless! Hopefully this gives you a good foundation for building a customized YouTube downloader to fit your specific needs.


Conclusion


You now have a working YouTube downloader built in Python! With a few key libraries and a bit of elbow grease, it‘s relatively straightforward to put together a tool for saving your favorite videos, playlists, and channels for offline access.


Just remember to use it ethically and respect the intellectual property rights of content creators. Download responsibly!


The complete code for this project can be found on GitHub: [link to example code repo]

What will you build with these newfound YouTube downloading powers? Share your creations in the comments!


      
          
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