Every CCTV camera lists a resolution in megapixels: 2MP, 4MP, 5MP, 8MP. It is one of the first numbers on the box, but a higher number does not always mean a better system. This guide explains what resolution means, what it changes, and how to choose.
What does resolution mean?
Resolution is the number of pixels in the picture. More pixels means more detail when you zoom in on recorded footage. Common sizes are:
- 2MP: about 1920 × 1080 pixels (also called Full HD or 1080p)
- 4MP: commonly 2560 × 1440 or similar
- 8MP (4K): about 3840 × 2160 pixels
An 8MP picture has four times as many pixels as a 2MP picture.
What higher resolution gives you
- More detail on faces, clothing, and number plates, especially when you zoom in on a recording
- Wider coverage from one camera, because you can zoom into part of a large scene and still see detail
- More chance of identifying someone at a distance
What higher resolution costs
- More storage: higher resolution generally needs more bitrate, so a hard drive holds fewer days of footage. Read our CCTV storage guide.
- More network capacity: more data has to travel from the camera to the recorder and to your phone
- A more capable recorder: the NVR must support the resolution and the number of cameras
- Usually a higher camera price
Resolution is not the only thing that matters
A sharp-looking number can be spoiled by other factors:
- The lens: a wide lens covers more area but shows less detail at a distance, while a narrower lens shows more detail further away
- The sensor and night performance: a poor sensor gives noisy, blurry images after dark
- Wide dynamic range (WDR): keeps faces visible when there is bright sky or sun behind a person
- Placement: a camera that is too high, too far, or pointing into glare will not show faces, whatever its resolution
- Compression and bitrate: over-compressed video loses detail
A well-placed 4MP camera often gives more useful footage than a badly placed 8MP camera. See how to plan camera placement and our guide to night vision options.
Choosing resolution by area
| Area | Sensible choice |
|---|---|
| Gate or entrance where faces matter | 4MP or higher |
| Driveway or car park with number plates | 4MP or higher, with the right lens |
| Large open areas such as a yard | 4MP to 8MP, often with a narrower lens |
| Indoor room or corridor | 2MP to 4MP |
| General overview of a small area | 2MP is often enough |
For most homes and small businesses, 4MP is a good balance of detail, storage, and cost.
A quick checklist before you choose
- List each camera position and what you need to see there: a face, a number plate, or just movement.
- Choose the lens to match the distance, not only the megapixels.
- Check that your recorder supports the resolution on every channel.
- Work out the storage you need for the number of days you want to keep. Higher resolution means a bigger hard drive for the same number of days.
- Test the night footage of the exact model before you buy, because night performance often matters more than daytime sharpness.
Common mistakes
- Buying the highest resolution everywhere, then running out of storage within days
- Ignoring the lens, so faces at the gate are too small to identify
- Pointing cameras at glare, which washes out detail whatever the resolution
- Forgetting that remote viewing on a phone uses a lower-quality stream, so the phone picture does not show the full resolution
Frequently asked questions
Is 4K (8MP) worth it?
For wide areas where you need to zoom in, such as yards and car parks, it can be. For most homes and shops, 4MP is enough and uses much less storage.
Does a higher resolution camera see farther?
It captures more detail, but how far you can identify someone also depends on the lens, lighting, and where the camera is placed.
Will a high-resolution camera work with my recorder?
Only if the recorder supports that resolution. Check the maximum resolution per channel and the total number of cameras it can handle. See NVR vs DVR.
Get help choosing
We recommend the right resolution for each camera position after a free site survey. See our CCTV installation service, compare IP and analogue cameras, or contact us.