Video adapters and converters connect a computer, laptop or games console to a monitor, projector or TV when the ports on each side do not match. The main types are HDMI, DisplayPort, USB-C, DVI and VGA adapters, plus active converters that change the signal itself. They suit home users, offices and anyone linking new equipment to older screens.
How to choose a video adapter or converter
Connectors on both ends. Check the exact video output on your device and the input on your screen before anything else. A laptop with USB-C and a monitor with HDMI needs a different product from a desktop with DisplayPort and an older VGA projector.
Resolution and refresh rate. Look for the maximum resolution the adapter supports, such as Full HD, 1440p or 4K at 60 Hz. A cheap adapter that tops out at 4K at 30 Hz will work, but the mouse and window movement feel noticeably choppy.
Active or passive. Passive adapters only rewire the connection, which is enough for DisplayPort to HDMI on most devices. Going from HDMI to VGA, or from HDMI to DisplayPort, needs an active converter because the signal type or direction changes.
Audio and power. VGA carries no sound, so a converter to VGA usually needs a separate 3.5 mm audio output. Some active converters draw power from a USB port, so check that a free port is available near your device.
USB-C support. A USB-C port only sends video if it supports DisplayPort Alt Mode or Thunderbolt. Where it does not, a USB graphics adapter with its own chip is the alternative.
Adapter types to look for
- HDMI adapters: the most common choice for laptops, TVs and consoles, available for connecting to DVI, VGA and USB-C sources.
- DisplayPort adapters: used on graphics cards and business monitors, often to reach HDMI or DVI screens or to run extra displays.
- USB-C video adapters: allow slim laptops and some tablets to drive an external display over a single port.
- VGA and DVI converters: keep older monitors and projectors in use with newer digital outputs.
Frequently asked questions
Do I need an active or passive video adapter?
It depends on the conversion. Passive adapters are enough for DisplayPort to HDMI or DVI on most devices. Converting a digital signal to analogue VGA, or HDMI to DisplayPort, requires an active converter with a chip inside.
Can I connect an HDMI laptop to a VGA monitor?
Yes, with an HDMI to VGA converter. A simple cable will not work, because HDMI is digital and VGA is analogue. Since VGA does not carry sound, you will need a separate audio cable if the monitor or projector has speakers.
Will a USB-C to HDMI adapter work with my laptop?
It works only if the laptop's USB-C port supports video output through DisplayPort Alt Mode or Thunderbolt. The port is often marked with a DisplayPort or Thunderbolt symbol, and the laptop's specification sheet will confirm it. If not, a USB graphics adapter is the alternative.
Does a video adapter reduce picture quality?
A good digital adapter does not reduce quality within its supported resolution and refresh rate. Converting to analogue VGA can make the picture slightly softer, especially at higher resolutions. Match the adapter's rated resolution to your screen to avoid limits such as 4K at only 30 Hz.
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