What Is the Difference Between HDMI and Mini HDMI?

HDMI and Mini HDMI are the same video and audio interface in two plug sizes. Standard HDMI, formally called Type A, is the full-size port on TVs, monitors, laptops and capture devices. Mini HDMI, or Type C, is a scaled-down version found on some cameras, camcorders and other compact devices. A third size, Micro HDMI or Type D, is smaller still and often appears on very small devices such as action cameras. The plug size determines which cable fits. It does not change the type of signal: a picture from a Mini or Micro HDMI port is ordinary HDMI video and audio.

One common mix-up can change the answer. Mini HDMI is not the same as Mini DisplayPort, which is a different interface found on some older computers. The two are not interchangeable without a converter. Also, some people say "mini HDMI" loosely to mean any small HDMI port. If a cable labeled Mini HDMI will not fit your camera, the port may be Micro HDMI.

How the three connectors compare

Connector | Also called | Relative size | Where it typically appears

HDMI | Type A, full-size | Largest | TVs, monitors, laptops, capture devices, some larger cameras

Mini HDMI | Type C | Noticeably narrower and thinner than full-size | Some camcorders and interchangeable-lens cameras, some tablets and small computers

Micro HDMI | Type D | Smallest, close to the width of a micro USB plug | Action cameras, some compact cameras, some single-board computers

All three are defined in the HDMI specification and have the same number of contacts. The smaller versions arrange those contacts in a more compact layout. The device uses the same video and audio signals whichever plug size it has.

Why smaller HDMI connectors exist

A full-size HDMI port is too tall and wide for a slim camera body or a thumb-sized action camera. Mini HDMI was introduced first as a smaller option. Micro HDMI came later for devices where even Mini HDMI took up too much room. The signal itself stayed the same. That is why a simple passive adapter or a cable with a different plug on each end can join a Micro or Mini HDMI port to a full-size one. No conversion electronics are needed.

A smaller plug does not mean lower quality. The resolutions and frame rates a camera can send depend on the camera's own HDMI output capabilities and on the cable's rating, not on the plug size. Your camera's specifications or manual list the output modes it supports.

Mini HDMI vs Micro HDMI

These two are the easiest to confuse because both are small. Mini HDMI is clearly wider and keeps the tapered shape of full-size HDMI: the opening is wider along one long edge than the other. Micro HDMI is much narrower and looks closer to a tiny rectangle. Its size can also make it look like a micro USB port. Micro USB is flatter, though, and has far fewer contacts. Never force a plug into a port where it does not slide in easily. Small ports can be damaged by the wrong connector.

How to identify the HDMI port on your camera

• Look for a label next to the port or under the port cover. Many cameras print "HDMI" or the HDMI logo there. Some also print the connector type.
• Check the camera's manual or specification sheet. Look for "Type C" (Mini HDMI) or "Type D" (Micro HDMI) in the connections or interface section.
• Compare the port with a full-size HDMI plug. If the port is close to the plug's width, it may be a full-size port. If it is clearly narrower but still tapered, it is likely Mini HDMI. If it is about the width of a micro USB plug, it is likely Micro HDMI.
• Rule out other small ports. USB-C is oval with rounded ends. Micro USB is very flat. If the camera has more than one small port, the manual's labeled diagram is the most reliable guide.
• If the camera has no HDMI-shaped port at all, it may offer video only over USB. If so, the HDMI cable question does not apply.

Choosing a cable or adapter for an action camera

Once you know the camera's port type, you need a path to the full-size HDMI port on a monitor or capture device. You have two main options.

• A single cable with the camera's plug type on one end and full-size HDMI on the other. This is usually the better choice for a camera that will stay connected. It avoids a rigid adapter acting as a lever on a small port.
• A short adapter that turns your camera's port into a full-size HDMI socket. This is convenient if you already own standard HDMI cables. A bulky adapter can strain a Micro HDMI port, though, especially if the cable gets bumped or the camera is mounted.
• For a mounted or moving camera, a cable with a right-angle plug or a thin, flexible lead puts less sideways force on the port.
• If you plan to use a high resolution or frame rate, choose a cable rated for that mode. An older or uncertified cable may work at lower settings and fail at higher ones.

Using an action camera's HDMI output in a video call

The right cable alone usually does not get the picture into a call. The HDMI port on most laptops and desktops is an output that sends the computer's screen to a display. It cannot receive video from a camera. To use a camera's HDMI output as a webcam, you typically need an HDMI capture device. It accepts the camera's HDMI signal and connects to the computer by USB. The computer then treats it as a video source that calling apps can select.

Several camera settings decide whether the result is usable. Many cameras overlay status information, such as recording time or battery level, on the HDMI output unless a "clean" output option is turned on. Some cameras power off automatically after a period of inactivity. A long call can also drain the battery or warm the camera. Some action cameras offer a built-in USB webcam mode that skips HDMI and a capture device altogether. Your camera's manual will confirm which of these apply. This guide cannot tell you which models offer clean output, external power during use or a webcam mode.

How to check that it worked

Each check below confirms one link in the chain. A successful check does not prove the next link works, so go through them in order.

• Fit: the plug slides fully into the camera port without force and does not wobble loosely. This confirms the connector type only.
• Signal: connect the camera directly to a TV or monitor and select that HDMI input. A live image confirms the camera is sending HDMI output. It does not confirm your capture device works.
• Capture: connect the camera through the capture device and open your operating system's camera app or the capture device's preview. A live, moving image confirms the computer can receive and display the camera's video.
• Call app: in your video-calling app's settings, choose the capture device as the camera and check the self-view. This confirms the app has camera permission and is using the right source.
• Call quality: a test call with someone else, or the app's test feature if it has one, shows how the picture looks after compression and network transfer. The earlier checks cannot show this.

If the TV shows nothing, the problem is likely between the camera and the cable. Reseat both ends, confirm the camera's HDMI output is enabled in its settings, and try another cable if you have one. If the TV works but the computer shows nothing, focus on the capture device: its connection, and whether the computer and the calling app detect it.