4K vs Full HD Streaming Explained
4K vs Full HD (1080p) streaming compared: resolution, bandwidth, data use, screen size and what your TV, device and internet need for true 4K.
Quick answerFull HD is 1920 × 1080 pixels; 4K Ultra HD is 3840 × 2160 — four times as many pixels. 4K looks sharper on large screens but needs 4K content, a 4K TV and device, and roughly 25 Mbps of stable bandwidth per stream.
The numbers
| Full HD (1080p) | 4K Ultra HD (2160p) | |
|---|---|---|
| Resolution | 1920 × 1080 | 3840 × 2160 |
| Total pixels | About 2.1 million | About 8.3 million |
| Suggested bandwidth per stream | About 10 Mbps | About 25 Mbps |
| Approximate data per hour | About 3 GB | About 7 GB |
Bandwidth and data figures are typical ranges; actual values depend on the codec and how much motion is on screen.
When does 4K make a visible difference?
4K is most noticeable on large screens viewed from a normal couch distance — around 55 inches and up. On a 32-inch bedroom TV or a phone, most people cannot see the difference from Full HD.
What you need for real 4K
All four must be true; if any one is missing, you will see HD:
- 4K source content. Many live channels are broadcast in HD; 4K is more common for select sports and films.
- A 4K screen.
- A 4K-capable streaming device, such as a Fire TV Stick 4K, a 4K Android TV device or a 4K Smart TV app.
- A fast, stable connection — around 25 Mbps for that stream alone.
Also check that the HDMI port and cable support 4K (look for HDMI 2.0 or later and a "Premium High Speed" cable).
What about HDR?
HDR (High Dynamic Range) improves brightness and color range, and is separate from resolution. A 1080p HDR picture can look more impressive than 4K without HDR. HDR needs support from the content, device and TV.
Should you choose 4K or HD?
- Choose HD for smaller TVs, phones, slower connections or multiple simultaneous streams on a limited connection.
- Choose 4K when you have a large 4K TV, a 4K device and the bandwidth to spare.
Sonix streams in Full HD and, where the source and your device support it, 4K. If your speed is borderline, read How Internet Speed Affects Streaming Quality.