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YouTube Downloader Using C# .NET

, 7 Feb 2015 CPOL
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Full C# code to download videos from YouTube in any quality.

Thanks everyone for your help in this project, your comments and suggests were very helpful for the project.

A new version of YouTube Downloader is released on 08 Feb 2015


This tip shows how to download YouTube videos using C# code only. The code is very simple to understand and anyone can easily integrate it in their solution or project.

I didn't use any third party library to do this task. All you need is to take two .cs files and integrate them to your project.

Using the Code

There are two main classes in this project:

YouTubeVideoQuality Class

This is the entity that describes the video.

 public class YouTubeVideoQuality
        /// <summary>
        /// Gets or Sets the file name
        /// </summary>
        public string VideoTitle { get; set; }
        /// <summary>
        /// Gets or Sets the file extention
        /// </summary>
        public string Extention { get; set; }
        /// <summary>
        /// Gets or Sets the file url
        /// </summary>
        public string DownloadUrl { get; set; }
        /// <summary>
        /// Gets or Sets the youtube video url
        /// </summary>
        public string VideoUrl { get; set; }
        /// <summary>
        /// Gets or Sets the youtube video size
        /// </summary>
        public long VideoSize { get; set; }
        /// <summary>
        /// Gets or Sets the youtube video dimension
        /// </summary>
        public Size Dimension { get; set; }
        /// <summary>
        /// Gets the youtube video length
        /// </summary>
        public long Length { get; set; }
        public override string ToString()
            string videoExtention = this.Extention;
            string videoDimension = formatSize(this.Dimension);
            string videoSize = String.Format
            (new FileSizeFormatProvider(), "{0:fs}", this.VideoSize);

            return String.Format
            ("{0} ({1}) - {2}", videoExtention.ToUpper(), videoDimension, videoSize);

        private string formatSize(Size value)
            string s = value.Height >= 720 ? " HD" : "";
            return ((Size)value).Width + " x " + value.Height + s;

YouTubeDownloader Class

This class downloads YouTube videos:

  public static class YouTubeDownloader
        public static List<YouTubeVideoQuality> GetYouTubeVideoUrls(string VideoUrl)
            var list = new List<YouTubeVideoQuality>();

            var id = YouTubeDownloader.GetVideoIDFromUrl(VideoUrl);
            var infoUrl = string.Format
            {0}&el=detailpage&ps=default&eurl=&gl=US&hl=en", id);
            var infoText = new WebClient().DownloadString(infoUrl);
            var infoValues = HttpUtility.ParseQueryString(infoText);
            var title = infoValues["title"];
            var videoDuration = infoValues["length_seconds"];
            var videos = infoValues["url_encoded_fmt_stream_map"].Split(',');
            foreach (var item in videos)
                    var data = HttpUtility.ParseQueryString(item);
                    var server = Uri.UnescapeDataString(data["fallback_host"]);
                    var url = Uri.UnescapeDataString(data["url"]) + 
                    "&fallback_host=" + server;
                    var size = getSize(url);
                    var videoItem = new YouTubeVideoQuality();
                    videoItem.DownloadUrl = url;
                    videoItem.VideoSize = size;
                    videoItem.VideoTitle = title;
                    var tagInfo = new ITagInfo(Uri.UnescapeDataString(data["itag"]));
                    videoItem.Dimension = tagInfo.VideoDimensions;
                    videoItem.Extention = tagInfo.VideoExtentions;
                    videoItem.Length = long.Parse(videoDuration);
                catch { }

            return list;

        private static long getSize(string videoUrl)
            HttpWebRequest fileInfoRequest = (HttpWebRequest)HttpWebRequest.Create(videoUrl);
            fileInfoRequest.Proxy = Helper.InitialProxy();
            HttpWebResponse fileInfoResponse = (HttpWebResponse)fileInfoRequest.GetResponse();
            long bytesLength = fileInfoResponse.ContentLength;
            return bytesLength;

        /// <summary>
        /// Get the ID of a youtube video from its URL
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static string GetVideoIDFromUrl(string url)
            url = url.Substring(url.IndexOf("?") + 1);
            char[] delimiters = { '&', '#' };
            string[] props = url.Split(delimiters, StringSplitOptions.RemoveEmptyEntries);

            string videoid = "";
            foreach (string prop in props)
                if (prop.StartsWith("v="))
                    videoid = prop.Substring(prop.IndexOf("v=") + 2);

            return videoid;

ITagInfo struct

This struct defines the itag information for videos:

 public struct ITagInfo
        const string itagExtentions = "5=flv,6=flv,17=3gp,18=mp4,22=mp4,34=flv,
        const string itagWideDimensions = "5=320x180,6=480x270,17=176x99,18=640x360,
        const string itagDimensions = "5=320x240,6=480x360,17=176x144,18=640x480,

        public ITagInfo(string iTag)
            : this()
            iTag = (iTag + "").Trim();
            foreach (var item in itagExtentions.Split(','))
                var nameValue = item.Split('=');
                if (nameValue[0] != iTag) continue;
                VideoExtentions = nameValue[1];
            foreach (var item in itagWideDimensions.Split(','))
                var nameValue = item.Split('=');
                if (nameValue[0] != iTag) continue;
                var widthAndHeight = nameValue[1].Split('x');
                VideoDimensions = new Size(int.Parse(widthAndHeight[0]), 
        /// <summary>
        /// Gets the Video Extentions that belong to itag
        /// </summary>
        public string VideoExtentions { get; private set; }
        /// <summary>
        /// Gets the Video Dimensions that belong to itag
        /// </summary>
        public Size VideoDimensions { get; private set; }

Points of Interest

Using this code, you can select the video quality depending on your internet connection speed to start download.

Many people have slow internet connections and they cannot watch videos from YouTube, so I made this code to help those people to download YouTube videos to their PCs so they can watch the videos offline.


Thanks to Motaz Alnuweiri, the downloader works again. Added self download videos.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Software Developer Desktop Team
Palestinian Territory (Occupied) Palestinian Territory (Occupied)
I have advanced skills in desktop apps development, i have built many apps for many corporations.

i'm using the follow languages in my work:
1- C# Language.
2- VB6 Language.
3- using C#.
4- Crystal Reports.

i have more than 7 experience years in coding and programming.

Systems and apps Developed by Us:
1-E-Archive System (VB6,Supports multi DataBase Engins).
2-SMS System (Multi languages such VB6,C#,Asp.Net and Gizmox).
3-Multi Camera Monitor System-Motion Detection and record(C#).
4-Administrative Evaluation System (
5-E-Clinic System (C#-using my business layer generator,Supports multi DataBase Engines).
6-Data Access Layer Generator Framework(C#).
7-Sip Provider -VOIP- Softphone (C#- for Italian company).
8-Training course Manager System(C#-for UCAS).
9-Computer Exam System (VB6,Oracle DataBase).
10-Dialer System (VB6).
11-Implement Google API using C# (Translation and web Search).
12-Print Management Enterprise(C#)
13-Elections System (C#- using my business layer generator).
14-Advanced English competition (VB6).
15-Remote USB Sharing (C/C++,VB6).
16-Watch Attendance (C/C++,VB6).
17-Tube Spy (C#).
18-AdminYourTube (C#)
19- Transport Reservation System (C#,,Ajax,Jquery)

Please visit my elance URL

Comments and Discussions

QuestionMessage Removed Pin
Dev Enthusiast20-Apr-15 16:39
memberDev Enthusiast20-Apr-15 16:39 
QuestionEasy 5, thanks & a question Pin
Franc Morales19-Mar-15 11:40
memberFranc Morales19-Mar-15 11:40 
QuestionAnother Test Case that Failed Pin
Dev Enthusiast17-Mar-15 9:23
memberDev Enthusiast17-Mar-15 9:23 
AnswerRe: Another Test Case that Failed Pin
ahmet_uzun18-Mar-15 1:12
memberahmet_uzun18-Mar-15 1:12 
BugRe: Another Test Case that Failed Pin
Dev Enthusiast18-Mar-15 11:30
memberDev Enthusiast18-Mar-15 11:30 
Questionwhy can't get the 1080p url Pin
Member 1152579114-Mar-15 22:54
memberMember 1152579114-Mar-15 22:54 
QuestionNot able to some youtube videos Pin
mkmurali14-Mar-15 8:24
membermkmurali14-Mar-15 8:24 
AnswerRe: Not able to some youtube videos Pin
Johann Krenn14-Mar-15 10:27
memberJohann Krenn14-Mar-15 10:27 
GeneralRe: Not able to some youtube videos Pin
Dev Enthusiast15-Mar-15 6:12
memberDev Enthusiast15-Mar-15 6:12 
GeneralMy vote of 1 Pin
St.Object12-Mar-15 15:56
memberSt.Object12-Mar-15 15:56 
GeneralGood job! Pin
Member 112479849-Mar-15 5:07
memberMember 112479849-Mar-15 5:07 
GeneralRe: Good job! Pin
Dev Enthusiast15-Mar-15 22:40
memberDev Enthusiast15-Mar-15 22:40 
GeneralRe: Good job! Pin
akramKamal15-Mar-15 23:45
memberakramKamal15-Mar-15 23:45 
QuestionIt's working Pin
TailBoy1-Mar-15 7:08
memberTailBoy1-Mar-15 7:08 
AnswerRe: It's working Pin
Dev Enthusiast1-Mar-15 16:16
memberDev Enthusiast1-Mar-15 16:16 
QuestionProxy Support in existing code Pin
Member 1108914326-Feb-15 19:03
memberMember 1108914326-Feb-15 19:03 
AnswerRe: Proxy Support in existing code Pin
Dev Enthusiast27-Feb-15 5:13
memberDev Enthusiast27-Feb-15 5:13 
GeneralRe: Proxy Support in existing code Pin
Member 1108914328-Feb-15 5:37
memberMember 1108914328-Feb-15 5:37 
Question403 - Forbiden Pin
EduardoMello23-Feb-15 9:32
memberEduardoMello23-Feb-15 9:32 
AnswerRe: 403 - Forbiden Pin
Dev Enthusiast23-Feb-15 16:50
memberDev Enthusiast23-Feb-15 16:50 
GeneralRe: 403 - Forbiden Pin
EduardoMello24-Feb-15 2:25
memberEduardoMello24-Feb-15 2:25 
AnswerRe: 403 - Forbiden Pin
Dev Enthusiast24-Feb-15 7:14
memberDev Enthusiast24-Feb-15 7:14 
GeneralRe: 403 - Forbiden Pin
EduardoMello24-Feb-15 13:45
memberEduardoMello24-Feb-15 13:45 
AnswerRe: 403 - Forbiden Pin
Dev Enthusiast26-Feb-15 3:42
memberDev Enthusiast26-Feb-15 3:42 
GeneralRe: 403 - Forbiden Pin
Member 114158241-Mar-15 11:36
memberMember 114158241-Mar-15 11:36 

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