OptiScaler

OptiScaler is a tool for PC gamers that lets you swap the image-sharpening technology a game uses without modifying the game itself. Modern PC games often include one upscaling option built in, such as DLSS (from Nvidia), FSR (from AMD), or XeSS (from Intel). These technologies take a lower-resolution image and produce a sharper, higher-resolution result, which improves performance. The problem is that many games only include one of these options, locking out players whose GPU works better with a different technology.

OptiScaler sits between the game and the graphics card and intercepts those upscaling calls. When the game asks for, say, DLSS, OptiScaler can redirect that request to FSR or XeSS instead, using whichever backend you choose through an in-game overlay. The overlay opens by pressing the Insert key while playing. This means AMD or Intel GPU owners can get upscaling working in games that shipped with Nvidia-only options, and vice versa.

Beyond swapping upscalers, OptiScaler also handles frame generation, which is a newer technique that inserts synthetic frames between real ones to make motion appear smoother. It can enable frame generation in games that do not natively support it, and it supports several frame generation formats including FSR 3, FSR 4, and XeFG. An experimental feature called OptiFG can add frame generation to DirectX 12 games that have no built-in support at all.

Additional features include sharpening filters you can tune manually, output scaling controls, integration with a companion tool called Fakenvapi for input latency improvements, and support for Nukem's dlssg-to-fsr3 mod. The project warns users that fake websites have impersonated it: the only official sources are the GitHub page, the Discord server, and the developer's NexusMods page. OptiScaler is free.