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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

GeneralMy vote of 5 PinmemberĐinh Công Thắng20-Feb-13 16:31 
GeneralMy vote of 5 PinmemberRoss Kyle rawlins19-Feb-13 20:38 
Questionaprriciation Pinmembermrk vishal19-Feb-13 7:56 
GeneralMy vote of 5 PinmvpMichael Haephrati מיכאל האפרתי19-Feb-13 7:20 
Questioncan't download the source code Pinmemberitronen18-Feb-13 11:47 
BugReplacement getQuality() function [modified] PinmemberCircleDock17-Feb-13 22:47 
SuggestionA codes for clicking download button... Pinmemberlllqqq16-Feb-13 16:05 
QuestionMy vote of 5 PinmemberNoel Buenaventura16-Feb-13 15:54 
Thank you very much for keeping up to date the source. Big Grin | :-D
BugResolution displayed incorectly in Quality setting PinmemberLogi Guna16-Feb-13 11:56 
GeneralRe: Resolution displayed incorectly in Quality setting PinmemberCircleDock17-Feb-13 22:33 
GeneralRe: Resolution displayed incorectly in Quality setting PinmemberLogi Guna18-Feb-13 0:40 
GeneralRe: Resolution displayed incorectly in Quality setting PinmemberCircleDock18-Feb-13 4:29 
GeneralMy vote of 5 PinmemberJohann Krenn16-Feb-13 0:08 
QuestionMy vote of 5 Pinmemberbandi.ramesh15-Feb-13 21:46 
QuestionMy solution for the constant YouTube changes. PinmemberTheFigmo15-Feb-13 6:20 
AnswerRe: My solution for the constant YouTube changes. PinmemberCircleDock15-Feb-13 8:12 
GeneralRe: My solution for the constant YouTube changes. PinmemberTheFigmo15-Feb-13 8:42 
GeneralRe: My solution for the constant YouTube changes. PinmemberCircleDock15-Feb-13 23:37 
GeneralRe: My solution for the constant YouTube changes. PinmemberTheFigmo16-Feb-13 4:20 
GeneralRe: My solution for the constant YouTube changes. PinmemberRiz Thon25-Feb-13 18:02 
QuestionYouTubes' new changes break this code PinmemberCircleDock14-Feb-13 8:47 
AnswerRe: YouTubes' new changes break this code PinmemberakramKamal14-Feb-13 10:10 
AnswerRe: YouTubes' new changes break this code [modified] PinmemberCircleDock14-Feb-13 21:50 
QuestionHow to get filesize ? Pinmemberjeffingeorge31-Jan-13 1:13 
QuestionTargetInvocationException was unhandled PinmemberMember 978351625-Jan-13 8:23 

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