Explainer

Exclusive fullscreen vs borderless: which should you use?

Every game's video settings offer some flavor of exclusive fullscreen vs borderless, most people pick whatever was default, and almost nobody knows what the setting actually changes. But it's the single switch that decides whether anything — a picture-in-picture video, a second app, a terminal overlay running your coding agent — can appear over your game. Here's what each mode really does.

Which should you use?

Use borderless (windowed) fullscreen unless you have a specific reason not to. On Windows 10 and 11, a borderless window covering the screen is promoted to the same direct presentation path as exclusive fullscreen, so performance is effectively identical — while alt-tab, notifications, and overlays keep working. Exclusive fullscreen still matters mainly for DX9-era games and some VRR edge cases.

Exclusive fullscreen: the game owns the display

In exclusive (or "true") fullscreen, the game takes direct control of the display. Its frames go more or less straight to the screen, bypassing the operating system's compositor — the part of the OS that normally stacks all your windows into one picture. That bypass was the whole point: in the 2000s it meaningfully reduced latency and raised frame rates, which is why "fullscreen = faster" became gospel.

The cost is that the OS is locked out of its own screen. Nothing else can be drawn — no notifications, no volume popup, no overlay windows. Alt-tab forces a jarring mode switch: black screen, resolution flicker, sometimes a crashed game.

Borderless: a window in a trench coat

Borderless fullscreen is just a normal borderless window with no title bar, sized exactly to your screen. It looks identical to fullscreen, but it lives inside the compositor like every other window. If you've seen this setting called borderless windowed, borderless windowed mode, windowed fullscreen, or just borderless screen — those are all the same thing, only the wording differs between games. That means:

• Instant alt-tab — no mode switch, no black flash.
• Notifications and popups work — the OS can draw over the game.
• Always-on-top windows work — which is the mechanism overlays like Backgrind use.
• Multi-monitor behaves — your mouse can leave the screen without minimizing the game.

The performance myth

The "exclusive is faster" rule is mostly a fossil. Since Windows 10's fullscreen optimizations and the DXGI flip presentation model, a borderless game that covers the whole screen gets promoted to an "independent flip" path — effectively the same direct route to the display that exclusive mode used, while still letting the compositor interject when something needs to draw on top. On Windows 11 this is the default behavior, and for most modern titles the difference in frame rate and input latency is within noise.

The exceptions are old DX9-era games and some edge cases with VRR/G-Sync, where exclusive mode can still behave differently. If you play one of those competitively, test both. For everything else, borderless costs you nothing you can measure.

Why overlays only work over borderless

An always-on-top window is drawn by the compositor: when the OS assembles the screen, it stacks that window above the others. In exclusive fullscreen there is no stack — the game's frames bypass composition entirely, so there's nowhere for another window to go. That's why a plain overlay window simply can't appear over exclusive fullscreen, no matter what it does.

The alternative — injecting code into the game to draw inside its frames, the way the Steam overlay works — does function in exclusive mode, but it means entering the game process, which is exactly the behavior anti-cheat watches for. We covered that trade-off in "Will a coding overlay get me banned?" — short version: Backgrind stays a plain window on purpose, and asks for borderless instead.

How to switch (ten seconds)

1. Open your game's Video / Graphics / Display settings.
2. Find Display Mode (sometimes "Window Mode").
3. Pick Borderless — naming varies: "Borderless Window" (most games), "Windowed Fullscreen" (WoW, Overwatch), "Borderless Windowed" (Cyberpunk).
4. Confirm the resolution matches your display's native resolution.

Practically every modern title has the option — WoW, League, Dota 2, Fortnite, Baldur's Gate 3, Path of Exile, Elden Ring. Many newer games don't even offer exclusive mode anymore, which tells you where the industry landed.

Minecraft: fullscreen or windowed?

Minecraft Java Edition is the odd one out: F11 toggles an exclusive-style fullscreen, and there's no built-in borderless option. If you want anything drawn over the game, either play in a maximized window or add a borderless mod (Cubes Without Borders and Borderless Fullscreen are the current picks); Bedrock on Windows runs borderless by default. Full setup in coding while playing Minecraft.

Dota 2: exclusive fullscreen or borderless window?

Dota 2's video settings offer all three: Exclusive Fullscreen, Borderless Window, and Windowed. Borderless Window is what most players run — tabbing between matches is instant, and on modern Windows the frame-rate difference is negligible. Exclusive shaves a sliver of input latency that only matters at a seriously competitive level. Pick Borderless Window; per-game setup in coding while playing Dota 2.

Escape from Tarkov: fullscreen or borderless?

Tarkov offers Fullscreen and Borderless in its graphics settings, and it's one of the games where the old rule inverts: plenty of players report equal or better frame rates in Borderless. Given how much of Tarkov is queue time and stash management, Borderless plus an overlay is an easy pick. More games are covered in the code-while-gaming hub.

The takeaway

Borderless gives you the same picture, near-identical performance on modern Windows, instant tabbing — and a screen the OS can actually draw on. That last part is what makes it possible to keep an AI coding agent running while you game, visible in the corner via an always-on-top terminal over any app. See it in action in the live demo.

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