Download YouTube to USB free
Install free software
Download and run free Freemake Video Downloader.
Copy YouTube URL
Go to YouTube video you want to download to USB and copy its URL. Paste the link into Free YouTube Downloader. Choose a necessary video or audio format and quality.
Save YouTube to USB
Choose "Download" or "Convert to...". Select your flash drive as destination folder. Click "Download" to start the process.
You can also download YouTube to MP3 with the help of Freemake software.