Connecting an Android Device to an HDMI Display over USB-C

Before you start

This process runs locally between your Android device, a USB-C to HDMI adapter, an HDMI cable, and a display. It does not require an online service or account. Check that your Android device supports sending video over its USB-C port. This capability may be called DisplayPort Alternate Mode or HDMI Alternate Mode, and it is not present on every phone or tablet. Also make sure the adapter matches your intended use: a simple USB-C to HDMI adapter does not need external power, while a multiport hub that includes HDMI, USB ports, or power delivery may require a charger for reliable operation. Prepare the HDMI display and set it to the correct input before testing.

Step-by-step instructions

Connect the HDMI cable to the display, then connect the other end to the adapter. Plug the adapter into the Android device's USB-C port. If you are using a powered hub or dock, connect its power source according to the manufacturer's instructions.

Turn on or wake the display and select the HDMI input that matches the port you used. Unlock the Android device. Some devices show a notification or on-screen prompt about the external display or screen mirroring; if a prompt appears, follow it.

If the screen does not appear automatically, open the display or screen mirroring settings. The exact name and location vary by Android version and manufacturer. Look for an option such as screen cast, external display, connected display, or HDMI. Select the external display and choose the desired mode, such as mirroring or desktop mode, when offered.

On devices where the connected display appears in settings, you can change how the screen is used. Common options include mirroring the phone screen or using a desktop-like interface. If rotation, resolution, or aspect ratio settings are available, adjust them only after confirming that the basic picture is present.

To disconnect, close any active desktop or presentation mode if required, then unplug the adapter from the phone. Reversing the connection order is usually safe, but avoid removing power from a powered hub while it is still carrying data if the hub documentation advises against it.

Check the output

Confirm that the Android screen or its desktop interface appears on the HDMI display. Play a short video or move through the home screen to check that motion is smooth enough for your use. If you are presenting or watching video, check that audio comes from the expected output. Some devices send audio to the HDMI display automatically, while others keep audio on the phone or require a separate audio output choice.

Be aware of resolution and format limits. The output resolution may not match the phone's native resolution, and the display may use letterboxing or scaling. Some devices produce a desktop mode with different app behavior, while others simply mirror the screen. These limitations depend on the Android version and the adapter, so verify them on your own hardware rather than assuming a specific maximum resolution or frame rate.

Common problems and next steps

If the display stays black or shows no signal, first check that the adapter is fully inserted into the phone and that the HDMI input on the display matches the cable connection. Try another HDMI cable if available. The most common cause beyond these checks is a phone that does not support video output over USB-C. A USB-C port can transfer power and data without supporting the video signaling required by a passive HDMI adapter.

Some cheap or data-only USB-C adapters cannot carry HDMI video. If possible, test the adapter with another device that is known to support USB-C video output, or consult the phone and adapter documentation. For a multiport hub, connect its required power source if video is intermittent or absent.

If the picture appears but audio is missing, check the Android media output or connected devices menu. Depending on the device, you may need to switch audio from the phone speaker to the HDMI display, or the adapter may not support audio pass-through.

If the display shows an image but it is stretched, cropped, or low resolution, look for display scaling or resolution options in the Android external display settings and on the HDMI display itself. On some devices, the orientation or aspect ratio is controlled by the app or by desktop mode settings rather than by the main screen settings.