You pay for the premium tier, you own a 4K television, and the picture still says HD in the corner. Everything on the checklist looks right, so you assume something is broken.
Usually nothing is broken. 4K is a chain rather than a checklist, and it fails silently at whichever link is weakest.
Who offers 4K in the UK
The services carrying 4K HDR content here are Netflix, Prime Video, Disney+, Apple TV+ and Rakuten TV.
Not everything on them is in 4K. Each holds a subset of its catalogue in the format, generally its own productions and recent big titles, with older and licensed material still in HD.
The HDR formats differ too. Prime Video supports both HDR10+ and Dolby Vision. Netflix has backed Dolby Vision. Whether your television handles one, both or neither affects what you actually see.
The six links in the chain
All six have to hold. Any one of them failing drops you to HD, usually with no explanation on screen.
| Link | What has to be true |
|---|---|
| 1. Your plan | Netflix requires its Premium tier. Cheaper tiers cap at lower resolutions |
| 2. Your connection | Netflix asks for 25 Mbps or more for 4K |
| 3. The title | It has to exist in 4K. Most catalogues do not |
| 4. The source device | TV app, stick or console must be 4K capable |
| 5. The cable and ports | HDCP 2.2 certified, end to end |
| 6. The display | An actual 4K panel with HDCP 2.2 inputs |
The link that catches everyone
Number five, and it is invisible.
HDCP 2.2 is copy protection built into the connection between your source and your screen. Netflix, Prime Video and Disney+ all require it for 4K. If any part of that path is not certified, the service quietly refuses to send 4K and gives you HD instead.
That means the HDMI cable, the port on the streaming device, and the port on the television all have to comply. An older cable will happily carry HD and silently block 4K.
The usual culprits:
- An older HDMI cable left in place from a previous setup
- The wrong HDMI port. Many televisions have only one or two HDCP 2.2 ports, often labelled differently from the rest
- Anything in between. Switches, splitters and KVM boxes break the chain regularly
- Soundbars and AV receivers passing video through, if they predate the standard
How to test it in two minutes
- Plug the streaming device straight into the television. Bypass the soundbar, receiver, switch or anything else in the path.
- Use a different HDMI port, ideally one labelled for 4K or HDR.
- Swap the cable for a newer one.
- Then check the picture quality indicator in the app or the television’s information panel.
If 4K appears when the device is connected directly, you have found your broken link.
Bandwidth
Netflix asks for 25 Mbps for 4K. That sounds demanding until you set it against what British homes actually have, where the median connection runs somewhere around 80 to 100 Mbps.
So bandwidth is rarely the problem here. If your picture is dropping, the issue is far more likely to be the Wi-Fi link between router and device than the broadband itself, which our guide to internet speed for streaming in the UK works through with the arithmetic.
The question nobody selling you a subscription will ask
Is 4K worth paying for?
Two things are worth weighing before you upgrade a tier for it.
You may not be able to see it. The visible difference between good HD and 4K depends on screen size and how far away you sit. At the distances most British living rooms actually use, on the screen sizes most people own, the gap is far smaller than the gap between subscription tiers. Sitting closer or buying a larger screen changes that. Paying more does not, on its own.
It costs data. Netflix’s own figures put 4K at up to 7 GB an hour, against roughly 3 GB for HD. On a capped connection, a mobile broadband package or a rural line, that is a real constraint rather than a technicality.
When it genuinely is worth it
- A large screen, roughly 55 inches upward
- You sit reasonably close to it
- You watch a lot of recent, big-budget material, which is where 4K catalogues are deepest
- Your connection is uncapped
- You care about HDR, which on many titles makes more visible difference than the resolution does
HDR is worth separating out. Better contrast and colour are often more noticeable on ordinary viewing than the extra pixels, and the two usually arrive together.
Checking what you are actually getting
Most televisions show the incoming signal in an information panel, and streaming apps generally mark 4K or Ultra HD titles in their listings. Netflix also shows the playback quality on the title’s own page.
If the badge says 4K and the picture still looks soft, that is a different problem. A stream that has dropped quality to keep playing is covered in our guide to fixing Netflix buffering and poor picture quality, which separates the two faults properly.
Common questions
Which UK services stream in 4K?
Netflix, Prime Video, Disney+, Apple TV+ and Rakuten TV, though only part of each catalogue is available in the format.
Why is my 4K TV showing HD?
Usually the HDCP chain. An older cable, the wrong HDMI port, or a device in between such as a soundbar or switch will block 4K while passing HD.
What speed do I need for 4K?
Netflix asks for 25 Mbps. Most UK connections clear that comfortably, so Wi-Fi coverage is the more common problem.
How much data does 4K use?
Up to around 7 GB an hour, against roughly 3 GB for HD.
Is 4K worth the extra cost?
On a large screen watched from close up, often. On a smaller screen across a room, frequently not. HDR tends to be more visible than the resolution itself.
The short version
Six links, and it breaks at the weakest. If everything looks right and you are still getting HD, plug the device straight into the television with a newer cable before assuming anything else. And before paying more for a tier, be honest about whether you would see the difference from where you sit.
For how the tiers differ more broadly, see our guide to UK streaming services compared.
