USB-C explained: charging, data and video over one port

What USB-C can do

A USB-C port can carry: power (charging), data, and video - but not every port does all three. The capabilities are set by the silicon inside the device, not the cable.

For video output (DP Alt Mode)

If you want to connect a USB-C port to a DisplayPort or HDMI display, the source device needs to support DisplayPort Alternate Mode. Most modern laptops do; a phone or tablet is less reliable - check the spec sheet. A USB-C to DisplayPort cable only works source-to-display, one direction. The Cable Finder flags this and links here for context.

For charging (wattage and e-markers)

USB-C charging wattage is limited by the cable as well as the charger. Cables up to 60W (USB PD) work with any good USB-C cable. Above 60W you need a cable with an e-marker chip inside one of the plugs - this chip tells the charger that the cable is rated for high wattage. The Cable Finder restricts to e-marked cables automatically when you enter wattage above 60W.

For data speed

USB-C ports run at USB 2.0 (480Mbps) up to USB 3.2 Gen 2x2 (20Gbps) or Thunderbolt 4 (40Gbps), depending on the host. The cable needs to match - a USB 2.0 cable limits a USB 3.2 port. Always check the cable's rated data speed against your port's spec.