F11 does not control fullscreen in OBS Studio — it controls your web browser

If you pressed F11 while OBS Studio was open and your browser went fullscreen instead, that is because F11 is a browser hotkey, not an OBS hotkey. OBS Studio does not use F11 by default. If fullscreen mode activated in your browser, you pressed F11 while the browser window had focus, not OBS.

If you want to prevent F11 from triggering fullscreen in your browser while you are streaming or recording, you have two options: change your browser's fullscreen setting, or make sure OBS has focus when you are working. Neither involves changing anything inside OBS itself.

Key Takeaways

  • F11 is a browser hotkey that makes your web browser go fullscreen — OBS Studio does not use F11 as a default hotkey.
  • If F11 triggered fullscreen, your browser window had focus when you pressed it, not OBS.
  • You can disable F11 fullscreen in most browsers through settings or by using a browser extension that blocks the hotkey.
  • The simplest fix is to click the OBS window before pressing any hotkeys to make sure OBS has focus instead of your browser.

Why F11 triggered fullscreen when OBS was open

OBS Studio sits on top of your desktop alongside other windows. When you press a hotkey, your operating system sends it to whichever window is currently active — the one you last clicked on or typed in. If you had a browser tab open behind OBS and pressed F11, the browser received the command even though you were looking at OBS.

This happens most often when you are setting up a stream or recording session. You might have a browser open to check chat, read a script, or monitor a dashboard. If you click back to OBS to adjust a setting and then press F11 thinking it will do something in OBS, the browser catches the keystroke instead because it still has focus in the background.

How to prevent F11 from triggering fullscreen in your browser

Most browsers allow you to disable fullscreen mode entirely or restrict which websites can use it. In Chrome and Edge, open Settings, go to Privacy and Security, then scroll to Permissions and find Fullscreen. You can toggle it off or set it to "Do not allow" for all sites. In Firefox, type about:config in the address bar, search for fullscreen.enabled, and set it to false.

If you want to keep fullscreen available for legitimate uses but just prevent accidental F11 presses, a browser extension is a safer choice. Extensions like "Disable Fullscreen" or "F11 Blocker" (available in the Chrome Web Store and Firefox Add-ons) intercept the F11 key and prevent it from working. This way you keep fullscreen available for websites that need it, but you cannot accidentally trigger it.

Making sure OBS has focus before you press hotkeys

The fastest fix is to click the OBS window before pressing any hotkey. When you click OBS, it becomes the active window and receives all keyboard input. Any hotkey you press after that goes to OBS, not to a browser or other program in the background.

If you are streaming or recording and switching between OBS and a browser frequently, get in the habit of clicking the OBS window after each browser task. This prevents accidental hotkey presses from triggering the wrong program. You can also minimize your browser or move it to a second monitor so you are less likely to click it by accident.

Checking if you have custom hotkeys set in OBS

Open OBS Studio and go to Settings (or Preferences on Mac). Click Hotkeys on the left side. Scroll through the list and search for any entry that mentions "fullscreen" or "F11". OBS does not assign F11 to any function by default, so if you see F11 listed here, a previous user or a plugin added it.

If you find F11 assigned to something, click the hotkey field and press Delete or Backspace to remove it. Then click Apply and OK. This will not affect your browser — it only removes the hotkey from OBS. If you do not see F11 listed anywhere, then OBS is not using it, and the fullscreen was definitely triggered by your browser.

Frequently Asked Questions

Can I remap F11 to do something else in OBS?

Yes. In OBS Settings under Hotkeys, find any action you want to assign to F11 — for example, "Start Recording" or "Mute Microphone". Click the hotkey field next to it and press F11. OBS will now use F11 for that action instead. This does not affect your browser, but it does mean F11 will trigger that OBS action whenever OBS has focus.

Why does my browser still go fullscreen even after I disabled it in settings?

Some websites can request fullscreen permission separately from the browser setting. If a website asks for fullscreen access, your browser may show a prompt. You can click "Block" on the prompt, or go back to your browser settings and set fullscreen to "Block all sites" instead of "Ask". This prevents any website from requesting fullscreen.

Does disabling fullscreen in my browser affect streaming or recording in OBS?

No. Disabling fullscreen in your browser only affects the browser itself. OBS has its own fullscreen mode (accessible through View menu or by right-clicking the preview window), which is separate from your browser settings and will not be affected.

What if I want to use fullscreen in my browser sometimes but not others?

Use a browser extension that lets you toggle F11 on and off, or use a different hotkey. Some extensions let you whitelist specific websites that are allowed to go fullscreen while blocking F11 globally. This gives you the most control without having to change browser settings every time.