AlphaRes is a free, lightweight Windows tool that lets you set and lock a custom resolution in Fortnite, including the popular stretched resolutions used by competitive players. Fortnite’s in-game settings menu only offers the resolutions your monitor reports natively, and the game often overwrites manual config edits the moment you launch it. AlphaRes solves both problems by letting you type in any width and height you want, apply it to Fortnite’s settings file, and mark that file as read-only so the game can’t reset it. Whether you want 1750×1080, 1440×1080, or a classic 4:3 stretched setup, download AlphaRes free and get your custom Fortnite resolution working in under a minute, without manually editing GameUserSettings.ini.

AlphaRes works by editing Fortnite’s GameUserSettings.ini configuration file directly, so there’s no guesswork with folder paths or file attributes. Open the tool, enter your desired width and height, tick the “Read-only” box, and press Apply. You can also set a custom FPS cap, or enter 0 for an uncapped frame rate, which is useful for players with high refresh rate monitors at 144Hz, 240Hz, or 360Hz. Starting with version 1.1, AlphaRes includes a Revert button that restores your settings file to its previous state, making it easy to switch back to native resolution at any time. For a true stretched look, you may also need to set scaling to “Full-screen” in the NVIDIA Control Panel or AMD Radeon Software and create a matching custom resolution there.

Stretched resolution has been a staple in competitive shooters for years, from CS:GO and CS2 to Valorant and Fortnite. Many players feel that a 4:3 or custom stretched aspect ratio makes character models appear wider and easier to track, while a lower render resolution can raise FPS and reduce input latency on mid-range gaming PCs and laptops. Others simply prefer the feel they’ve built up over thousands of hours of play. Fortnite players in Battle Royale, Zero Build, and creative box-fight maps often pair a custom resolution with performance mode, lower graphics settings, and a high frame rate for the smoothest, most responsive experience. AlphaRes makes it easy to test different resolutions and find the setup that suits your aim and your hardware.

AlphaRes is a single portable .exe with nothing to install; just download it, place it somewhere convenient like your Desktop or Documents folder, and run it. To uninstall, simply delete the file. The project is open source on GitHub and written in C++, so anyone can review the code or compile it themselves. AlphaRes doesn’t inject into the game or modify Fortnite’s executable files; it only edits the same settings file the game uses to save your options. Because it’s a small, unsigned utility, some antivirus programs may flag it as a false positive, in which case you can add it as an exception. Note that while the read-only box is checked, Fortnite won’t be able to save settings changes you make in-game, so uncheck it and press Apply whenever you want to adjust your settings normally.