Top Free HD YouTube Video Downloader 1. YT1s YT1s is a browser-based YouTube video downloader designed to convert and download Youtube videos in high quality MP3 or MP4 formats for free. It supports formats such as MP4, MP3, M4A, WEBM, and 3GP, with high quality options. It does not require users to create an account or install any apps or software. YT1s works on all devices computers,...