An all-in-one (AIO) computer is a desktop computer that builds the processor, memory, storage, and other components into the same housing as the display. Most models also include speakers, microphones, and a webcam, so one unit and a keyboard and mouse make a complete setup. The design saves space and cuts cable clutter, but it limits upgrades compared with a tower.
All-in-One Computer Essentials at a Glance
Combines the computer and display in a single unit
Usually includes a built-in webcam, speakers, and microphones
Needs only one power cable, plus a keyboard and mouse
Takes up less desk space than a tower and separate monitor
Offers fewer upgrade options than a tower desktop, depending on the model
How Is an All-in-One Computer Built?
An all-in-one packs a full desktop into the thin space behind the screen. To make that work, the design differs from a tower in a few ways:
Compact components: Many all-in-ones use low-power processors and compact boards designed for thin devices. This keeps heat and power use manageable inside the display housing.
Integrated or dedicated graphics: Most models rely on graphics built into the processor. Select models, such as some HP OmniStudio X All-in-One configurations, add a dedicated graphics processor.
Built-in cooling: Small fans and heat pipes move heat to vents, usually on the back or top of the unit.
Stand: The stand supports the whole computer. Most tilt, and some models also adjust in height.
Port placement: Ports usually sit on the back or side of the display. Some models add easy-access USB ports on the side or base.
Because the parts are tightly packed and often fixed in place, an all-in-one's configuration matters more at purchase than a tower's does.
Built-In Display and Design Features
The display is the part of an all-in-one you can't swap later, so its features deserve the closest look.
All-in-one screen size
Common sizes include 23.8-inch, 27-inch, and 31.5-inch displays. Larger screens give you more room for side-by-side windows but need a deeper desk to view comfortably. Our HP All-in-One desktops come in 23.8-inch and 27-inch sizes, and HP OmniStudio X All-in-One models are available in 27-inch and 31.5-inch sizes.
All-in-one display resolution
Many all-in-ones use Full HD (FHD) resolution, which is 1920 x 1080 pixels. Select models offer 4K Ultra HD (UHD) at 3840 x 2160 pixels for sharper text and more detail in photo and video work. Learn more about display resolution.
Touch screen all-in-ones
Some all-in-ones offer a touch screen, which is handy for drawing, browsing photos, or using apps designed for touch. Touch is usually a configuration option, so check the model details.
All-in-one webcam and privacy camera
Most all-in-ones include a webcam for video calls. Many HP All-in-One and HP OmniStudio X models use a pop-up privacy camera that retracts into the display when you're not using it. Learn more about webcams.
All-in-one speakers and microphones
Built-in speakers and dual microphones let you take calls and stream media without extra accessories. Some HP OmniStudio X models feature Poly Studio speakers.
All-in-one keyboard and mouse
Many all-in-ones ship with a matching keyboard and mouse, either wired or wireless. If yours doesn't, see our guides to keyboards and mice.
Advantages and Trade-Offs of All-in-One Computers
An all-in-one trades flexibility for simplicity. Here's how that balance plays out.
All-in-one advantages
Space saving: One unit on a stand takes up less room than a tower and a separate monitor.
Fewer cables: A single power cable is often all you need, especially with a wireless keyboard and mouse.
Ready for calls: The built-in webcam, microphones, and speakers handle video calls out of the box.
Easy to relocate: Moving to another room means carrying one unit instead of several pieces.
Clean look: A slim design suits kitchens, living rooms, reception desks, and other visible spaces.
All-in-one trade-offs
Limited upgrades: Memory and storage access varies by model, and the processor and graphics are usually fixed. Plan for the specs you'll need for years.
Display and computer share a fate: You can't keep the screen and replace only the computer, or the other way around.
More involved repairs: Tightly packed parts can make service more complex than on a tower.
Less cooling headroom: The thin housing limits sustained performance for heavy workloads like long renders or demanding games.
Price per spec: An all-in-one often costs more than a tower with similar internal specs, because the display and accessories are part of the price.
For a deeper side-by-side look, read our comparison of desktop PCs, all-in-ones, and workstations.
All-in-One Computers vs. Other Desktop Form Factors
A tower desktop offers more upgrade room and cooling, and it lets you pick any monitor, but it takes more space and cables. A mini PC is even smaller than an all-in-one but needs a separate monitor, speakers, and webcam. An all-in-one sits between the two: compact and complete in one unit, with less flexibility. See more desktop comparisons.
Who Should Choose an All-in-One Computer?
An all-in-one is a strong fit when a tidy, ready-to-use setup matters more than future upgrades.
Families and shared spaces: One unit in the kitchen or living room handles homework, browsing, streaming, and video calls.
Home offices: A large built-in screen, camera, and microphones cover everyday work with minimal setup. Learn why an all-in-one works well for a home office.
Businesses with visible workstations: Reception desks, front counters, and shared offices benefit from a clean, compact design. Learn more about business desktops.
Anyone short on desk space: A single unit leaves more room to work.
If you plan to upgrade components over time or need sustained high performance for gaming or 3D work, a tower desktop is usually the better choice. To match a desktop to your tasks, see desktops by use.
What to Check Before Buying an All-in-One Computer
Since most of an all-in-one's hardware is fixed, choose the configuration carefully.
Screen size and resolution: Match the screen to your desk depth and tasks. Consider 4K UHD if you work with photos, video, or detailed documents.
Touch or non-touch: Decide up front, because touch usually can't be added later.
Processor and memory: Buy enough performance and random access memory (RAM) for the next several years, since upgrades may be limited.
Storage: Pick a solid-state drive (SSD) large enough for your files, or plan for external storage.
Ports: Count the USB ports, display outputs, and wired network options you need, and note where they sit on the unit.
Camera and audio: Look for a privacy camera and noise-reducing microphones if you take frequent video calls.
Stand adjustability: Check the tilt range and whether the height adjusts, especially for long workdays.
AI features: Some newer all-in-ones include a neural processing unit (NPU) for on-device AI features. Learn what makes a PC an AI PC.
Our desktop specs guide explains each line of a spec sheet. When you're ready to compare models, browse HP all-in-one desktops for current configurations and pricing.
Frequently Asked Questions About All-in-One Computers
Can you upgrade an all-in-one computer?
Some all-in-one computers allow memory or storage upgrades through an access panel, but the processor and graphics are usually fixed. Upgrade options vary by model, so check the product's service documentation on HP Support before opening the unit.
Can an all-in-one computer be used as a monitor?
An all-in-one computer can work as a monitor for another device only if it has a video input port and a display mode that supports it. Many all-in-one computers have video output ports only, so check the port specifications before you buy.
Can you connect a second monitor to an all-in-one computer?
Many all-in-one computers support a second monitor through an HDMI output or a USB-C port with display support. Check the model's ports to confirm. Learn more about multi-monitor setups.
Are all-in-one computers good for gaming?
Most all-in-one computers handle casual and less demanding games well with integrated graphics. Select models with dedicated graphics can run more demanding titles. For high-end gaming and future upgrades, a tower desktop is usually the stronger choice. Learn more about gaming desktops.
Related Desktop Topics
Desktop computers: the main types of desktops and how they work
Budget desktops: getting the most value for your money
Desktop upgrades: what you can add or replace on a desktop
The 10 best HP desktops for everyday use: tower and all-in-one picks for home and work
