Function keys on your computer keyboard explained

The F1 through F12 keys are probably the most ignored real estate on your keyboard. A few of them will save you real time every day, and a couple explain mysterious behavior you’ve already run into. This is the home-user version, minus the trivia.

What each key actually does

These are the Windows defaults; programs can assign their own meanings, but these hold in daily use.

• F1 opens the help window in most programs. Rarely the help you wanted, but it’s there.
• F2 renames whatever file or folder you have selected. Faster than the right-click menu.
• F3 opens search in many programs. In a web browser, Ctrl+F is the one to memorize instead: it finds any word on the page.
• F4 matters mostly in one combination: Alt+F4 closes the program you’re in.
• F5 is refresh. It reloads the web page or the folder you’re looking at, and it’s the most useful key in the row.
• F6 jumps your cursor to the browser’s address bar so you can type a web address without the mouse.
• F7 runs the spelling and grammar check in Word and Outlook.
• F8 is mostly retired. It once opened Windows startup menus; on a modern computer you can ignore it.
• F9 tells classic Outlook to send and receive mail right now instead of waiting for the next automatic check.
• F10 activates the menu bar. The better trick is Shift+F10, which opens the right-click menu without a mouse.
• F11 puts your browser in full-screen mode. If your tabs and toolbars ever vanished, you brushed this key; press it again to bring them back.
• F12 is Save As in Microsoft Office. In a browser it opens developer tools, a wall of code that alarms people every time. Press F12 again to close it.

The Fn key, or why F5 sometimes dims your screen

On laptops, the F-keys work a double shift. Manufacturers print hardware controls on the same keys (brightness, volume, mute, airplane mode), and each laptop ships with one set as the default. Some treat the F-functions as primary, so you hold the Fn key (bottom row, near the space bar) to reach the hardware controls. Others do the reverse, which is why pressing F5 on many laptops changes brightness instead of refreshing the page.

Fn-lock flips that default. On most laptops it’s Fn+Esc; look for a small padlock icon printed on the Esc key. If your function keys “stopped working” one day, an accidental Fn-lock is the usual culprit, and a single press puts things back.

One more note from that row: many laptops put airplane mode on an F-key. If your WiFi disappears out of nowhere, check the key with the little airplane icon before assuming something broke.

If you’d rather be shown than read a list

Keyboard tricks stick best when someone demonstrates them on your own computer. That’s most of what our tech training visits are: you write down your questions ahead of time, we sit down at your machine and work through the list, and we leave step-by-step notes for anything you’ll want to repeat later. Windows basics and “what does this key actually do” come up in those visits all the time.