Yes, mini HDMI can support 4K resolution, but it depends on the version of HDMI it supports.

Mini HDMI (Type C) is just a smaller form factor of the regular HDMI (Type A) connector. As long as the device and the cable support a high enough HDMI version (e.g., HDMI 2.0 or HDMI 2.1), it can transmit 4K video at appropriate refresh rates.

Here’s the breakdown:

1. HDMI 2.0 (both full-size and mini HDMI) can support 4K at 60Hz with a bandwidth of 18 Gbps.

2. HDMI 2.1 (if the mini HDMI port and cable support it) can handle 4K at 120Hz or even 8K at 60Hz, with a much higher bandwidth of 48 Gbps.

In essence, mini HDMI is fully capable of transmitting 4K content as long as both the device and cable are using the appropriate HDMI version (like HDMI 2.0 or 2.1). So, if you're using a mini HDMI port on a device that supports HDMI 2.0 or 2.1, it will be able to output 4K video without issues.