Why does Cmd+C stop working in every app at once?

Usually the macOS pasteboard server (pboard) has hung. Quit it in Activity Monitor, or run killall pboard in Terminal — macOS relaunches it automatically and copy starts working again.

Cmd+C works in TextEdit but not my other app. Why?

That points to the specific app — a frozen window or a special text field. Restart that app; if it persists, it is an app bug rather than a system issue.

Could another app be stealing the Cmd+C shortcut?

Yes. Check System Settings > Keyboard > Keyboard Shortcuts and any text expanders or macro tools, which can reassign or intercept copy.

Does a clipboard manager fix Cmd+C itself?

No, but ClipHistory keeps a history of your last 150 clips so a flaky or doubled copy never loses your text — you can paste the earlier clip from the list.

Fix Command-C Not Working on Mac

How to Fix Command-C Not Working on Mac

When Cmd+C suddenly stops copying, it is almost always one of a handful of causes. Work through these in order — they go from most common to least.

1. Confirm something is actually selected

Cmd+C does nothing if nothing is highlighted. It sounds obvious, but a lost selection (a click that deselected your text) is the number one reason copy "fails." Select the text again, watch for the highlight, then press Cmd+C.

2. Check which app has focus

Keyboard shortcuts go to the frontmost app. If a background window, a notification, or the desktop has focus, your Cmd+C lands somewhere with nothing to copy. Click directly into the text first, then copy.

3. Rule out a stuck modifier key

If the Command key is physically stuck or a previous shortcut left a modifier "down," copy behaves oddly. Test it:

Open System Settings > Accessibility > Display and toggle nothing — just confirm keys respond elsewhere.
Press and release both Command keys firmly.
Try the other Command key (left vs right) — one may be failing.

You can also use Keyboard Viewer (enable it in System Settings > Keyboard) to see if Command lights up when you press it.

4. Look for a shortcut conflict

A utility, browser extension, or app may have hijacked Cmd+C. Check:

System Settings > Keyboard > Keyboard Shortcuts for a reassigned copy command.
Any text-expander, macro, or automation tools you run at login.

Quitting recently installed utilities and testing again isolates the culprit fast.

5. Restart the pasteboard server

macOS runs a background process, pboard, that manages copy and paste. If it hangs, copy silently fails system-wide. Restart it:

Open Activity Monitor, search for pboard, select it, and quit it. macOS relaunches it automatically.
If you prefer Terminal: killall pboard then try copying again.

This fixes the case where copy stops working in every app at once.

6. Test in another app

Try Cmd+C in TextEdit or Notes. If it works there but not in your problem app, the issue is that app (a frozen window, a bug, or a special text field). Restart that app.

7. Restart the Mac

A full restart clears stuck processes and key states. If everything above fails, this resolves the stubborn cases.

A safety net so a missed copy costs you nothing

Here is the frustrating part: even after Cmd+C works again, the text you tried to copy earlier is gone, because the macOS clipboard only ever holds the last item. If a flaky copy made you copy twice, the first item was overwritten.

ClipHistory keeps a running history of your last 150 clips, so a missed or doubled copy is not a dead end — you press Cmd+Shift+V and grab the clip from the list. You can also pin clips you need to keep around indefinitely.

It will not repair a stuck key, but it removes the worst consequence of clipboard trouble: losing the thing you were trying to copy. Everything is stored locally on your Mac — no account, no cloud.

Special cases worth knowing

A few situations look like "Cmd+C is broken" but have their own causes:

Remote desktop and virtual machines. Inside a VM or a remote session, copy may be governed by that environment's own clipboard sharing setting, not macOS. Check the VM's shared-clipboard option.
Secure fields. Password fields and some banking inputs deliberately block copy for security. That is by design, not a fault.
Web apps. A few browser-based editors override Cmd+C with their own handler. If copy fails on one site but works everywhere else, the site is the cause — try the page's own copy button if it has one.
Terminal. In Terminal, plain Cmd+C may send an interrupt rather than copy, depending on what is running. Select text first; copying selected text still works.

Confirm the fix without losing data

After you get copy working again, test it on throwaway text rather than the important paragraph you have been fighting with — that way a remaining glitch does not cost you. Better still, if you run a clipboard history, the test copy is saved anyway, so there is no risk either way.

Quick checklist

Is text actually selected?
Is the right app in focus?
Is a Command key stuck or failing?
Did another tool reassign Cmd+C?
Restart pboard, then the app, then the Mac.

Stop losing clips and digging through documents. Get ClipHistory for macOS — $19.99 (one-time payment, 12-month license, no auto-renewal). Signed and notarized by Apple, runs on macOS 12+, and everything stays local on your Mac.