Top 3 Tools to Download YouTube Videos in HD for Free:

1. Y2Meta

Y2Meta is a web-based YouTube downloader that allows you to convert and download YouTube videos into MP3 or MP4 files for free in hd quality. It offers users multiple high resolutions options for video and audio formats. It works seamlessly on all devices like computer, mobile and tablet without installing apps, extensions or software. There are no limits on video and audio download from YouTube. You can download unlimited YouTube content for free of cost.

Key features:

• Browser-based access without installing software or apps.
• Simple video-link input process.
• Offer different resolution options.
• Provide audio and video format options.
• Compatible with mobile, tablets and desktop.
• No registrations required.

How to download YouTube videos in HD:

1. Open YouTube and copy the link to a video you like to download.
2. Visit the Y2Meta website and paste the link into its input field.
3. Select the resolution and format options.
4. Click on the download button and save the file on your device.

2. SaveTube

SaveTube is an online YouTube video downloader that allows users to convert youtube videos and download in the hd quality for free. It allows users to convert and download unlimited video and audio from Youtube without any cost. Just paste a video URL, select the quality and format and download the files. You can download YouTube videos on Android, macOS, windows and linux. 

Key features:

• Web-based YouTube downloader on all browsers.
• Offer high video quality choices, including 1080p.
• Support different output formats.
• Compatible with smartphones, tablets and computers.
• Work without installing an application.

How to download YouTube videos in HD:

1. Copy the URL of a YouTube video you want to download.
2. Open the SaveTube website.
3. Paste the URL into the provided search field.
4. Choose HD quality and format. 
5. Hit the download button to save the file.

3. Y2Mate

Y2Mate is a free online YouTube downloader that enables users to easily download YouTube videos in MP3 or MP4 format for free in high resolutions. It is an online tool that works on all devices without installing apps, extensions or software. However, users can use any devices like Android, macOS, Windows and iOS. Y2Mate is 100% free and secure youtube downloader that allows you to download unlimited youtube videos in 720p, 14080p, 2k and even 4K highest quality.

Key features:

• Online access through all popular browsers.
• Provide different video quality options.
• Support audio and video conversion.
• Convenient for mobile devices and computers.
• Not requiring an app installation.

How to download YouTube videos in HD:

1. Copy the link of a YouTube video.
2. Open the Y2Mate website.
3. Paste the video URL into its search or input box.
4. Select a suitable format and HD option.
5. Click the download to save the file.