Can I just turn my DisplayPort to HDMI adapter around?

No, and it is the most common mistake made with these two connectors. Those adapters are uni-directional: they lean on the DisplayPort source doing the conversion itself through dual-mode, so there is no conversion hardware in the dongle to work the other way. An HDMI source has no comparable ability, so it needs a converter built specifically for HDMI in and DisplayPort out.

Why does a passive HDMI to DisplayPort adapter not exist?

Because the standard only reaches in one direction. DisplayPort's dual-mode feature gives a DisplayPort output a documented method of emitting HDMI-compatible signalling through a passive cable. Nothing in either specification gives a DisplayPort input a way to accept an HDMI signal. Without that, the translation has to be done by a chip, which by definition makes the device active.

Does the converter need to be plugged into power?

Frequently, yes. Many carry a short USB-A lead because the HDMI source is not required to provide enough current for the conversion chip. If yours has one, use it. An underpowered converter usually shows up as a screen that stays black, or an image that appears at boot and then cuts out once the resolution changes.

What resolution and refresh rate should I expect from one?

The common HDMI 2.0 to DisplayPort 1.2 class works within about 18Gbps, which covers 4K at 60Hz, 1440p at higher refresh rates and 1080p at 120Hz. An HDMI 1.4 source caps 4K at 30Hz no matter what the converter claims. Buy on the stated HDMI and DisplayPort version numbers rather than a headline resolution.

Will G-Sync or FreeSync still work through the conversion?

Often not, or only in a reduced form - some converters restrict G-Sync operation to 1080p, and many simply do not pass variable refresh at all. If tear-free frame pacing is the reason you bought the monitor, use a native output on the source instead of converting into it.

Does sound reach the monitor's speakers through the adapter?

Multi-channel LPCM generally travels through without issue, as long as the source is actually set to output audio over its HDMI port rather than to an internal or USB device. Compressed bitstream formats such as Dolby and DTS passthrough are the ones most likely to be stripped, and the display still has to have speakers or a headphone output to use it.

Is USB-C DisplayPort Alt Mode a better route than converting?

If the source has it, yes. A USB-C port with DisplayPort Alt Mode carries a native DisplayPort signal, so a USB-C to DisplayPort cable delivers it to the monitor with nothing translating in between. Worth knowing: Alt Mode does not include the dual-mode capability, so a passive USB-C to HDMI cable is a different animal and depends on the host implementing it.

Which devices most often need this direction of conversion?

Handheld and small-form-factor PCs, games consoles, streaming boxes, older laptops with a single HDMI output, and capture or KVM hardware that only emits HDMI. The pattern is almost always the same: the source has one video socket and it is HDMI, while the free input left on the monitor is DisplayPort.

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HDMI to DisplayPort Adapter SA

Active HDMI to DisplayPort converter connecting an HDMI source to a DisplayPort monitor

HDMI Source to DisplayPort Display - Read This First

These two directions are not the same product and they are not interchangeable. A DisplayPort output can be talked into emitting an HDMI-style signal on its own, through the optional dual-mode feature written into the DisplayPort standard, which is why a cheap passive dongle works that way round. No equivalent exists for a DisplayPort input receiving HDMI. Sending HDMI into a DisplayPort screen requires a converter with a chip inside that rebuilds the signal.

So if the picture is coming out of a laptop, a console, a mini PC, a set-top box or a capture device with only an HDMI socket, and the screen in front of you only has a free DisplayPort socket, this is the page you want. If it is the other way around, you need a DisplayPort-to-HDMI adapter instead, and turning one around will not work in either case.

How an Active HDMI to DisplayPort Converter Works

HDMI and DisplayPort are not two names for the same electrical signal. HDMI carries a TMDS signal descended from DVI, while DisplayPort sends packetised data over lanes. The DisplayPort specification includes an optional dual-mode capability that lets a compliant source transmit HDMI-compatible signalling down a passive cable, which is the trick every cheap DisplayPort-to-HDMI dongle relies on. The specification never defined the reverse, so a DisplayPort input has no way to interpret an HDMI stream on its own.

The HDMI plug goes into whatever is producing the picture, and the DisplayPort end feeds the screen. Get that backwards and you will see nothing at all - no signal, no error, no setting on either device that recovers it. Product listings label this as uni-directional or state the direction as HDMI in, DisplayPort out, and that wording is the part to read before checkout.

The conversion chip draws current that an HDMI source is not obliged to supply, so many converters include a USB-A pigtail for a 5V feed. Leave it unplugged and the symptoms are a black screen, a picture that appears then drops, or flicker under load. Any spare USB port on the source, a monitor's downstream USB port or a phone charger will do the job.

The mainstream class of converter takes HDMI 2.0 in and puts DisplayPort 1.2 out, giving roughly 18Gbps of headroom. That is enough for 3840x2160 at 60Hz, 2560x1440 at higher rates, or 1920x1080 at 120Hz. Older HDMI 1.4 sources drop 4K to 30Hz regardless of the converter. Anything faster needs a unit that names both HDMI and DisplayPort versions on the specification, not just a resolution.

Multi-channel LPCM audio normally passes through provided the source is set to output sound over HDMI; compressed bitstream formats are the ones that tend to be dropped. HDCP 2.2 is supported by most current converters, which matters for protected streaming. Variable refresh is where the conversion is weakest - G-Sync and FreeSync are often unsupported or restricted, sometimes only functioning at 1080p.

Check the display's input menu first. Plenty of DisplayPort monitors also carry an HDMI socket that is simply occupied by something else or switched off in the on-screen menu, and a direct cable always beats a converted signal. If the source has a USB-C port with DisplayPort Alt Mode, a USB-C to DisplayPort cable is the cleaner answer - that path carries a native DisplayPort signal with no conversion in it.

That gap is filled by silicon. An active converter receives the HDMI stream, decodes it, then generates a fresh DisplayPort stream for the monitor, which is why these units cost more than a passive dongle, run slightly warm, and frequently carry a short USB lead for power. The conversion is one-way by design and locked to one direction in hardware.

How an Active HDMI to DisplayPort Converter Works

HDMI Source to DisplayPort Display - Read This First

HDMI to DisplayPort Adapter SA(0)

HDMI to DisplayPort Adapter SA(0)

How an Active HDMI to DisplayPort Converter Works

How an Active HDMI to DisplayPort Converter Works