A lightweight Windows utility that strips the borders from any window and places it into a region of your monitor — sized and anchored how you want, rather than only stretching it across the whole display.
Built for ultrawides. On a 7680×2160 monitor you can run a game as a 3840×2160 borderless window dead center, covering the taskbar, with 1920 px of desktop still usable on each side.
This project is a fork of ihateborders by Z1xus,
forked at commit b5bb27e (v1.1.1, 2026-02-16). All of the original window-manipulation work is
theirs — this fork adds region placement, always-on-top, persisted settings, and a number of
correctness fixes.
See NOTICE for the full list of modifications, and go star the original.
Download the latest release from the Releases
page. It's a single self-contained .exe — no installer, no dependencies. Verify it against the
SHA256SUMS.txt published alongside it if you like.
The binary is unsigned, so Windows SmartScreen will likely warn on first run — choose More info → Run anyway, or build it yourself from source (see below).
scoop install https://raw.githubusercontent.com/Alpha-Leader/UltraBorderless/main/scoop/ultraborderless.json- Run the executable.
- Pick a window from the dropdown.
- Choose a Placement mode.
- Click Make Borderless. Click Restore Borders to put it back exactly as it was.
Or set it up once and forget it: save a profile for the game and let auto-apply fix the window every time it appears, with the app sitting in the tray.
| Mode | Behavior |
|---|---|
| Region | Places the window into a sub-rectangle of the display. Set a size, pick an anchor. |
| Full display | Fills the entire monitor. |
| Leave in place | Strips borders without moving or resizing. |
In Region mode you get size fields with 4K / 1440p / 1080p presets, and an anchor of
Centered, Left, Right, or Custom (explicit x/y offset). A live preview shows exactly
where the window will land before you commit — e.g. → 3840x2160 at (1920, 0) with
sides free: 1920px | 1920px. It turns amber if the region runs past the display edge.
This is what makes taskbar coverage work. Windows only auto-hides the taskbar for a window that fills an entire monitor, so a narrower region can never cover it by position alone. Enabling this puts the window in the topmost band instead. It's on by default; restoring borders returns the window to its original z-order.
Select a window and click Save profile for <exe> in the Profiles section to remember the current placement and display for that application. With the profile's auto checkbox on, the window is fixed automatically within a few seconds of appearing — launch the game and it lands in its region, no clicking. Because some games re-take their own size shortly after launch, the placement is asserted once more two seconds after an auto-apply.
Auto-apply fires once per window: restoring a window by hand is respected, not fought. Profiles remember the monitor by device name, so they survive monitors being plugged in or removed.
The app lives in the system tray. By default the close button hides the window there — auto-apply and hotkeys keep working — and the tray menu has Show / Hide, Restore all windows, and Quit. Left-click the tray icon to bring the window back. Start minimized to tray (in Options) makes it launch straight to the tray.
Two global hotkeys work from anywhere, no alt-tabbing to the app:
Ctrl+Alt+B— toggle borderless on the focused window, using its profile if it has one and the current UI placement otherwiseCtrl+Alt+R— restore every window this app stripped
Bindings are editable in the config file (hotkey_toggle, hotkey_restore_all,
hotkey_cursor_lock) as modifier+key, e.g. ctrl+shift+f12. Modifiers: ctrl, alt, shift,
win; keys: letters, digits, f1–f12. If a binding is taken by another app, a status message
says so and everything else keeps working.
A profile's 🖱 toggle confines the mouse to that window's rectangle while it has focus — the fix
for edge-scroll or a stray click sliding the pointer into the desktop strip beside the game.
Ctrl+Alt+L toggles the lock for whatever window is focused right now, profile or not, as a
session-only override. It releases the moment focus moves elsewhere and is off by default: opt in
per profile, since a mouse that unexpectedly can't leave a window is a worse surprise than not
locking it.
Every window this app has placed is watched continuously. If something knocks it out of the topmost band or nudges it off its region — a driver overlay, a game re-asserting its own window, Windows' own z-order shuffling — it's put back automatically, usually within a quarter of a second while it has focus and at worst by the next 5-second scan. A short debounce keeps it from fighting a placement you're deliberately adjusting by hand.
Two more options for a fully immersive region, both in Options:
- Auto-hide taskbar while gaming hides the taskbar for as long as any window is managed by this app, so a notification flash can't draw over the game. It's restored exactly as it was when the last managed window closes or the app exits — and if the app is ever killed outright while this is on, the next launch notices and restores it rather than leaving your taskbar stuck.
- Dim companion windows while gaming — mark a window (Discord, a browser, a stats page) as a Companion in its own section, and it dims to a set brightness the moment a managed game gains focus, so it's visible in your peripheral vision without competing for attention. Hover a dimmed companion to bring it back to full brightness without touching the game's focus; move away and it dims again.
- [B] — borderless window
- [W] — windowed (has borders)
- System windows are filtered out, and the list refreshes every 5 seconds
- The display dropdown only appears if you have more than one monitor
In the app:
F5— refresh the window listEsc— clear the current selection
Global (work everywhere): Ctrl+Alt+B toggle focused window, Ctrl+Alt+R restore all,
Ctrl+Alt+L toggle cursor lock on the focused window — see
System tray and hotkeys.
Persisted to %APPDATA%\ultraborderless\config.txt as plain key=value text — placement,
display, tray behavior, hotkey bindings, gaming-session options, and one numbered block each for
profiles (profile.0.exe=game, profile.0.width=3840, …) and companions (companion.0.exe=discord).
Saved on exit and after each action; delete the file to reset to defaults. Unknown keys are
ignored, so files travel between versions.
Original window frames are persisted separately to frames.txt in the same folder, so
Restore Borders still works after the app restarts — even after a crash: on relaunch a saved
frame is re-attached to a window matching the same executable and window class. Entries expire
after seven days.
- Set the game to Windowed mode first, not its own borderless or exclusive-fullscreen mode — exclusive fullscreen has no border to strip.
- Set the game's internal render resolution to match the region size.
- Some games re-assert their own window size after placement or on a focus/resolution change (auto-apply re-asserts the placement once, two seconds in, which handles most of them), and a few ignore external placement entirely.
- Windows 10/11
- To modify an elevated window (Task Manager, an admin terminal), run this as administrator too — Windows blocks a normal-privilege process from restyling an elevated one.
git clone https://github.com/Alpha-Leader/UltraBorderless
cd UltraBorderless
cargo build --releaseThe binary lands in target/release/ultraborderless.exe, and is portable — no target-cpu=native,
so a build from one machine runs on any x86-64 CPU.
Run the tests with cargo test.
GPL-3.0-only — see LICENSE. As a derivative of ihateborders, which is GPL-3.0, this project remains under the same license.