Use the YouTube app and tap Download on eligible videos with YouTube Premium
Open the video in the YouTube app
Tap Download below the video
Choose the download quality if prompted
Wait for the video to finish downloading
Watch it later in Library or Downloads inside the YouTube app
Use a browser-based video downloader only if it complies with YouTube’s terms and local laws
Paste the video link into a trusted downloader website
Select the desired format and quality
Download the file to your iPhone
Save it to Files or Photos if needed
Use the Files app to manage downloaded videos
Use AirDrop from another device if the video is already downloaded there
Transfer the file to your iPhone via AirDrop and save it locally