What Is a Fuser? HDMI Overlay Devices Explained
What Is a Fuser?
A Fuser (also called an HDMI Fuser or hardware overlay device) is a piece of hardware that takes the video output from two computers and merges them into a single display. In a DMA setup, it combines your gaming PC's video with the overlay from your reading PC, so you only need one monitor.
Before Fusers existed, DMA users had to either use two separate monitors (one for the game, one for the overlay) or rely on software overlays that added latency and created detection risks. The Fuser eliminates both problems entirely.
How Does It Work?
The concept is simple. You plug your gaming PC's HDMI output into the Fuser, and your reading PC's HDMI output into the Fuser. The Fuser then outputs a single combined image to your gaming monitor.
The device uses RGB cutout technology — it only displays the non-black pixels from the reading PC's output on top of your game. So if your reading PC is showing ESP boxes and lines on a black background, only those boxes and lines appear on your gaming screen, perfectly overlaid on top of the gameplay.
Why Use a Fuser Instead of a Software Overlay?
- Zero detection risk — Nothing runs on your gaming PC. The overlay happens purely in hardware.
- Low latency — Hardware processing is near-instant compared to software overlays that add frame delay.
- One monitor setup — No need for a second monitor taking up desk space.
- Clean and seamless — The overlay looks like it's part of the game itself.
Pro Tip: A Fuser works best when paired with a DMA card and proper firmware. The DMA card reads the game data, the reading PC processes it into an overlay, and the Fuser merges everything onto your screen. It's the complete package.
Who Needs a Fuser?
If you're running a DMA setup and want a clean, single-monitor experience with zero added risk, a Fuser is essential. It's especially popular with competitive gamers who need real-time overlay information without any performance hit or extra detection vectors.
Check out our Fuser collection to find the right one for your setup.