You are on a train tomorrow, or going somewhere with no signal, and you want a few videos with you. The phone is what you actually watch on, so that is where the file should end up.
Good news: no app needed. Less good news, if you are on iPhone: Apple puts one extra step between you and your camera roll.
Would Premium be enough?
If you only want to watch offline inside the YouTube app, Premium does that and it is the simplest route.
What it does not give you is a file. You cannot open a Premium video in another player, send it to someone, or edit it. And it stops working when you sign out, or after 29 days without a connection. (YouTube Help)
If you want a real MP4 sitting on your phone, keep reading.
How to download to your phone in 3 steps
Copy the link in the YouTube app
Tap Share under the video, then Copy link. You get a short youtu.be address, which works just like the long one.
Open the downloader in your browser
Safari on iPhone, Chrome on Android. Paste the link and pick your quality. 1080p is the sensible choice for a phone screen.
Save the file
The download starts straight away. Where it lands depends on your phone, which is the next section.
Download to your phone now
Works in Safari and Chrome. Nothing to install, no account.
Open the downloaderOn iPhone: the extra step
Safari does not put downloads in your camera roll. It puts them in the Files app, under Downloads. That catches everyone out the first time.
Accept the prompt
The first time, Safari asks whether you allow downloads from the site. That is normal, and it comes from the browser, not the page. Accept, and a download arrow appears to the right of the address bar.
Find the file
Tap the arrow, then the file. Or open the Files app and go to On My iPhone → Downloads.
Move it to Photos, if you want it there
Long-press the file, tap Share, then Save Video. It now shows up in your camera roll and plays like anything you filmed yourself.
iPhone treats your photo library as a protected space. Only apps you have given permission can write to it. A browser download goes to the file system instead. It is a choice Apple made on purpose, not a failure.
On Android: nothing to do
Chrome saves to the Downloads folder, and Android notices it within a few seconds. The video shows up in your gallery on its own, next to your own recordings.
If it does not appear, close and reopen the gallery app. The file is already there, and any file manager will show it.
Which quality to take on a phone
A phone screen is small and storage runs out. Taking 4K onto a device that shows about 1080p is spending gigabytes on pixels you cannot see.
| Quality | Good when | Size, per 10 min |
|---|---|---|
| 720p | Podcasts, people talking, low on space | 80 – 150 MB |
| 1080p | The right default for a phone | 150 – 400 MB |
| 4K | Only if you will send it to a TV later | 1 – 3 GB |
One exception: if you plan to put the file on a television later, take the higher quality now. You cannot add it back afterwards.
What happens to the subtitles
Subtitles are not part of the picture. YouTube keeps them as separate text that the player lays over the video. That is why you can switch languages while watching.
A downloaded MP4 has the video and the sound. The subtitles stay behind. For a video in your own language that changes nothing. For a foreign talk you were relying on subtitles for, it changes everything — and it is better to find out now than on the train.
Watching it offline
Once the file is on your phone, any player opens it. The built-in one, or VLC if you want subtitle and speed controls.
Nothing checks in with a server, nothing expires, and airplane mode changes nothing. That is the real difference with a Premium download.
Watch your storage
Video eats space faster than people expect. Ten one-hour videos at 1080p will take somewhere between 15 and 25 GB.
Check your free space first, and delete the files once you have watched them. A downloaded video you will never watch again is just an expensive way to store nothing.