Fullscreenizer 1.0

Free Download KasumiL5x Fullscreenizer for Windows PC. It is a handy tool that lets you turn windowed games into full-screen without borders in just a few clicks.

Overview of Fullscreenizer

It is a simple yet powerful utility designed for gamers seeking a cleaner and more immersive display experience. Whether you’re tired of window borders, taskbars popping up, or alt-tabbing ruining your gameplay, this software solves that problem. It works by making games appear as if they’re running in fullscreen mode—even when they technically aren’t.

The tool is lightweight, supports hotkeys, and stores your configuration for future sessions. It works smoothly with multiple monitors, and its user-friendly filter keeps things neat by showing only the apps you want to manage.

How It Works

When launched, the tool scans your open applications and shows only those that can be full-screened based on the filter. You can instantly switch to full screen by clicking on the app, hitting the hotkey, or using the interface. The best part? It’s fully reversible. You can bring it back to its original windowed state anytime you want.

This flexibility makes it especially useful for games that don’t offer proper full-screen options or where switching modes causes issues.

Hotkey Integration

One of the coolest features is the hotkey support. You can assign a key combo that instantly triggers fullscreenizing, even without opening the interface. It saves time and works like magic in mid-game. If you prefer automation, the tool also supports auto-start and hotkey activation as soon as Windows boots up.

Configuration and Ease of Use

All your settings are saved, so you don’t have to reconfigure anything every time. Whether it's the selected apps, hotkeys, or startup behavior, everything sticks until you decide to change it. The interface is minimal but practical, making the whole experience easy for beginners and pros alike.

The built-in filter keeps the display clean by only showing relevant applications, avoiding distractions. It’s beneficial when you have many windows open but only want to tweak a specific game or app.

Multiple Monitor Support

If you’re a multitasker or a streamer with dual monitors, you’ll love how this utility handles multiple screens. It doesn’t interfere with your secondary display while switching your main game window to full screen. You can also select which monitor the app should occupy.

This makes it a perfect fit for people who play on one screen and stream or monitor tools on another.

Lightweight and Portable

There’s no installation required. Just launch and go. It’s super lightweight and doesn’t hog system resources, so even low-end PCs benefit from it. It runs quietly in the background, and you won’t even notice it—until you need it.

This makes it great for travel or shared systems where you can’t install permanent apps.

System Requirements

• Operating System: Windows 11 / 10 / 8.1 / 7
• Processor: Minimum 1 GHz Processor (2.4 GHz recommended)
• RAM: 2GB (4GB or more recommended)
• Free Hard Disk Space: 200MB or more is recommended

Conclusion

This tool provides a hassle-free way to make windowed games and apps feel like native full-screen without requiring any settings adjustments or impacting performance. It’s clean, reliable, and works—perfect for gamers and multitaskers alike.