Surveillance Guide

H.264 vs H.265 Security Cameras Codec, Storage, Bandwidth, and Compatibility Explained

The short version: H.265 records the same picture at roughly half the file size and bandwidth of H.264, so it saves storage and network load, especially on 4K systems. H.264 wins on raw compatibility because almost every recorder, browser, and app can play it. For most new business installs H.265 is the smarter default, with H.264 as the safe fallback on older hardware.

Start Free Trial View Pricing

The Short Answer

Same Picture, Half the File

H.264 and H.265 are both video compression standards, the math a camera uses to shrink raw footage so it fits on a drive and travels over a network. H.264, also called AVC, has been the workhorse of security video for years and runs on practically everything. H.265, also called HEVC, is its successor. It compresses smarter, so it stores the same image quality in far less space.

The headline number is storage. At the same resolution and the same visual quality, H.265 typically uses 40 to 60 percent less data than H.264. A 4K camera that streams at about 8 Mbps in H.264 can hold the same detail at roughly 4 Mbps in H.265. Cut the bitrate in half and you either double how many days of footage a drive holds or run twice the cameras on the same upload pipe.

The catch is compatibility and processing. H.265 is newer and heavier to decode, so older NVRs, web browsers, mobile apps, and low-power devices may stutter or refuse to play it. H.264 just works. That trade, smaller files versus broader support, is the whole decision. The sections below break down storage, bandwidth, quality, and compatibility so you can match the codec to your hardware.

At a Glance

Also calledAVC / HEVC

Storage savedH.265 ~40-60%

4K bitrate~8 vs ~4 Mbps

CompatibilityH.264 widest

Decode loadH.265 higher

Best defaultH.265 (modern)

General guidance. Exact bitrates vary by camera, scene, and settings.

Side by Side

H.264 vs H.265: The Differences That Matter

Every difference below traces back to one thing: H.265 is a newer, more efficient codec. It packs the same image into less data, at the cost of more processing and narrower support.

Factor	H.264 (AVC)	H.265 (HEVC)
Compression	Efficient, the long-time standard	Roughly 40-60% smaller files at equal quality
Bandwidth (4K)	Around 8 Mbps per camera	Around 4 Mbps for the same image
Storage needed	More drive space per day	Up to twice the retention on the same disk
Compatibility	Plays on nearly every recorder, browser, app	Modern devices only; older hardware may fail
Processing load	Light; easy to decode	Heavier; needs newer chips for smooth playback
Hardware cost	Cheaper, widely available	Cameras and recorders cost a bit more
Best for	Older systems; broad playback; live web view	4K; long retention; limited upload bandwidth

Figures are typical ranges; actual bitrate and savings depend on the camera, the amount of motion in the scene, frame rate, and your quality settings. Confirm codec support against your exact recorder and viewing devices.

Under the Hood

How H.264, H.265, and H.265+ Compress Video

All three split each frame into blocks and predict what stays the same between frames so they only store what changes. The newer the codec, the smarter that prediction.

H.264 (AVC): The Standard

H.264 breaks each frame into macroblocks up to 16 by 16 pixels and reuses unchanged areas from one frame to the next. It hits a strong balance of quality, file size, and easy decoding, which is why it became the default for security cameras, DVRs, and web video. Its weakness is simply age: at 4K and high frame rates the files grow large fast.

H.265 (HEVC): The Successor

H.265 uses larger, variable coding blocks up to 64 by 64 pixels and better motion prediction, so it describes the same scene with far less data. That efficiency is what cuts bitrate and storage roughly in half. The price is computation: encoding and decoding take more horsepower, so cameras, recorders, and viewing devices all need to support it.

H.265+ and Smart Codecs

Many cameras add a "+" or "Smart" mode (H.264+ and H.265+). These watch the scene and drop the bitrate further when little is moving, then raise it when activity returns. On a mostly static view like a stockroom or a back door, H.265+ can shrink storage dramatically. Make sure your recorder supports the exact mode so playback stays smooth.

A Note on Quality and Mixing Codecs

H.265 is not "higher quality" than H.264 in the way people sometimes assume. At the same bitrate the picture looks very similar; the gain is that H.265 reaches that quality using less data. So you spend the savings one of two ways: keep the bitrate and bank the storage, or hold the storage and push to a sharper 4K stream. Either way the codec is doing the work, not adding detail that was never captured.

You can run H.264 and H.265 cameras side by side, but only if the recorder decodes both. Most current NVRs do; some older units and budget recorders do not, and a browser or phone app that cannot decode H.265 will show a black or frozen image even when the recording is fine. Before you standardize on H.265, confirm every device in the chain, the camera, the recorder, and whatever you watch it on, can play it. Choosing cameras that speak open standards like ONVIF and stream over RTSP keeps your options open as codecs evolve.

Make the Call

Which Codec Should Your Business Use?

Match the codec to your cameras, your recorder, and how long you need to keep footage. These four cases cover most business installs.

01

Running 4K or Many Cameras

High resolution and high camera counts are where H.264 storage gets expensive. Choose H.265 to halve the bitrate, fit more days on the same drives, and ease the load on your network and PoE switches.

02

Long Retention Requirements

If a regulation or insurer makes you keep 30, 60, or 90 days of video, H.265 stretches your existing storage roughly twice as far. That can be the difference between adding drives and keeping the recorder you have.

03

Older Recorder or Viewers

If your NVR, browsers, or phone apps cannot decode H.265 smoothly, stay on H.264 (or use H.265 only where every device supports it). A flawless H.264 stream beats a stuttering H.265 one every time.

04

Limited Upload Bandwidth

Sites on slow DSL or shared internet struggle to push 4K H.264 off site. H.265 cuts the upload roughly in half, which makes remote viewing and cloud backup practical without choking the connection.

Codec Choice Is a Storage Decision

The reason the codec matters so much is that it sets how much video you can keep. Halving the bitrate roughly doubles your days of retention on the same hardware, which is why the H.264 versus H.265 question runs straight into how long you actually need to store footage. Our guide on how long to keep security camera footage covers the retention targets by industry, and the recorder side of the same decision is in our NVR vs DVR comparison.

Surveillant works with the IP cameras and recorders you already run, whatever codec they use. It adds real-time threat detection and natural-language video search on top, and stores footage with cloud video surveillance so an efficient codec turns directly into longer, searchable history off site. For very high camera counts, edge AI video analytics keeps the heavy processing local.

FAQ

Common Questions About H.264 vs H.265

What is the difference between H.264 and H.265?

H.264 and H.265 are both video compression standards, but H.265 is newer and more efficient. At the same resolution and quality, H.265 stores the same footage in roughly 40 to 60 percent less data than H.264, which saves storage and bandwidth. The trade-off is that H.265 needs more processing power and is not supported on some older recorders, browsers, and apps, where H.264 plays on almost everything.

Which is better for security cameras, H.264 or H.265?

For most new business installs, H.265 is better because it cuts storage and bandwidth roughly in half, which matters most on 4K systems and long retention. H.264 is the better choice when your recorder, browsers, or phone apps cannot decode H.265 reliably, or when you want the widest possible playback support. Match the codec to the oldest device that has to play the video.

Does H.265 use less storage than H.264?

Yes. H.265 typically uses 40 to 60 percent less storage than H.264 for the same image quality and resolution. A 4K camera that records around 8 Mbps in H.264 can hold the same detail at roughly 4 Mbps in H.265. In practice that can nearly double how many days of footage a given drive holds, or let you run more cameras on the same storage.

Is H.265 better quality than H.264?

Not exactly. At the same bitrate the picture quality is very similar; H.265 simply reaches that quality using less data. So the benefit shows up as smaller files and lower bandwidth rather than a sharper image. You can spend the efficiency either by keeping more days of footage or by pushing a higher-resolution stream within the same storage and bandwidth budget.

Can I mix H.264 and H.265 cameras on the same NVR?

Yes, as long as the NVR supports both codecs, and most modern recorders do. The recorder decodes each stream according to its codec, so you can add H.265 cameras to a system that already has H.264 ones. Before mixing, confirm the NVR and every viewing device, including browsers and mobile apps, can decode H.265, or those streams may appear black or frozen.

Does H.265 use less bandwidth than H.264?

Yes. H.265 uses roughly 45 to 50 percent less bandwidth than H.264 at the same resolution and quality. That makes it the practical choice for remote viewing, cloud backup, and sites with limited upload speed, because a 4K stream that needs about 8 Mbps in H.264 drops to around 4 Mbps in H.265. Lower bandwidth also eases the load on network switches in large deployments.

What is H.265+ or Smart codec?

H.265+ (and H.264+) are enhanced modes that lower the bitrate further by adapting to the scene. When little is moving, the camera drops the data rate; when activity returns, it raises it again. On mostly static views like a stockroom or back door, H.265+ can shrink storage dramatically. Confirm your recorder supports the specific Smart codec mode so playback and search stay reliable.

Explore More

Get More Days Out of the Footage You Capture

Whether your cameras record in H.264 or H.265, Surveillant connects to them and adds AI detection, natural-language search, and cloud retention from one console. Start a free 14-day trial and see your footage become searchable.