Copy and Paste Not Working on Mac? How to Fix It

You press ⌘C. You click where you want it. You press ⌘V — and nothing happens. Or worse, something from twenty minutes ago appears instead. When copy and paste is not working on your Mac, it's one of those failures that makes the whole machine feel untrustworthy, because you can't tell whether the copy failed, the paste failed, or the thing in between quietly lost your content.

The good news is that this almost never means something serious is broken. macOS runs a small background service that holds whatever you copy, and when copy-paste stops working it's usually that service getting stuck, a keyboard problem masquerading as a clipboard problem, or an app that refuses to hand over its content. Here's how to work through it, cheapest fix first.

Step 1: Find Out What's Actually Broken

Before you restart anything, spend fifteen seconds narrowing it down. Copy a line of plain text from a different app — say, from Notes — and paste it into TextEdit.

• Works everywhere except one app → the app is the problem, not macOS. Skip to the app-specific section below.
• Fails everywhere → the system pasteboard is stuck. Step 2 fixes this most of the time.
• ⌘V does nothing, but Edit → Paste in the menu bar works → it's your keyboard or a shortcut conflict, not the clipboard at all.

That last one catches a lot of people. If the menu command pastes fine, nothing is wrong with what you copied — the keystroke just isn't arriving.

Step 2: Restart the Pasteboard Server

macOS holds copied content in a background process called pboard. It's tiny, it's invisible, and occasionally it hangs — usually after an app crashes mid-copy or after you copy something unusually large. When it hangs, every copy and paste on the machine fails at once.

Restarting it takes one command. Open Terminal and run:

killall pboard

You won't see any output, and nothing will visibly happen. That's normal — macOS relaunches the service immediately. Copy something and try again.

Prefer not to use Terminal? Open Activity Monitor, search for pboard, select it, and click the ⊗ button to quit it. Same result.

This single step resolves the majority of "copy and paste suddenly stopped working" cases, and it costs you nothing — no restart, no lost work, no open documents closed.

Step 3: Restart the App, Then the Mac

If the pasteboard restart didn't do it, quit the app you're pasting into and reopen it. Apps cache a surprising amount about the clipboard, and one that has been running for days can lose track.

Still stuck? Restart the Mac. It's the unsatisfying advice, but copy-paste failures are one of the genuine cases where it works, because a restart clears not just pboard but WindowServer and the input stack too — and a wedged input stack produces exactly these symptoms.

Step 4: Rule Out the Keyboard

If Edit → Paste works but ⌘V doesn't, the clipboard is fine. Check these:

A stuck modifier key. A ⌘, ⌥ or ⌃ key that's physically or logically stuck breaks every shortcut on the machine. Open System Settings → Accessibility → Keyboard and check whether Sticky Keys is on. Tapping each modifier once also clears a logically stuck one.

A remapped or hijacked shortcut. Another app may have claimed ⌘V globally. Check System Settings → Keyboard → Keyboard Shortcuts, and quit recently installed utilities one at a time — text expanders, window managers and macro tools are the usual suspects.

The wrong keyboard layout. If you've switched input sources, the key you think is V may not be. Try Edit → Paste to confirm.

An external keyboard. Unplug it, or disconnect it over Bluetooth, and test on the built-in keyboard. Wireless keyboards with low batteries drop modifier keys before they drop ordinary ones, which produces this exact symptom.

Step 5: The App-Specific Causes

If copy-paste only fails in one place, the cause is almost always one of these.

The source app won't let you copy. Some apps deliberately block copying — DRM-protected documents, certain banking portals, video players, and some enterprise-managed apps. The copy silently does nothing, so the paste has nothing to deliver.

Formatting is the problem, not the clipboard. Copying from a web page into a design tool or a code editor sometimes fails because the app rejects the rich-text version while plain text would have worked. Try ⌥⇧⌘V (Paste and Match Style) — and if that's a daily annoyance, how to always paste as plain text covers making it permanent.

Remote desktop sessions and virtual machines. Screen sharing, Windows VMs and remote-access tools each maintain their own clipboard bridge, and those bridges break often. Look in the tool's own settings for a "shared clipboard" or "clipboard redirection" option and toggle it off and on; usually that's faster than restarting the session.

Secure Input is on. When an app tells macOS it is capturing keystrokes securely — a password field, or Terminal with Secure Keyboard Entry enabled — other utilities are blocked from seeing the keyboard. Ordinary ⌘V still works, but clipboard managers, text expanders and anything that pastes on your behalf will appear dead. If a helper app stopped working but the system clipboard is fine, check Terminal's menu for Secure Keyboard Entry and turn it off.

Missing Accessibility permission. Any app that pastes for you needs permission in System Settings → Privacy & Security → Accessibility. A macOS update can silently revoke it. Toggle the app off and back on in that list, then restart it.

Step 6: If It Pastes the Wrong Thing

A paste that produces old or unexpected content isn't a failure — it's a different feature getting in the way. Universal Clipboard shares whatever you copied on a nearby iPhone or iPad with your Mac, and the timing can surprise you. If pastes on your Mac keep arriving from another device, this Universal Clipboard checklist explains how the handoff works and how to stop it.

The Failure Nobody Fixes

Work through the steps above and copy-paste will come back. What won't come back is whatever you copied before it broke — and that's the part that actually costs you time. The pasteboard holds exactly one item, and every failure, restart and killall wipes it.

macOS 26 Tahoe softened this. There's now a built-in clipboard history in Spotlight: press ⌘Space, then ⌘4, and your recent copies appear. It's a real improvement over the single slot. It also has limits — items expire after roughly eight hours, there's no way to pin or organise anything, and it lives on that one Mac.

Copaste is the version that doesn't forget. Everything you copy — text, images, files — stays in a searchable history you can tag and pin, for as long as you want it, on macOS and Windows both. When the pasteboard wedges and you restart it, your history is still there. And because a Chrome extension carries the same history into the browser, the content survives the app that lost it.

The Short Version

1. Test in a second app to find out whether it's macOS or one app.
2. Run killall pboard in Terminal — this fixes most cases instantly.
3. Restart the app, then the Mac.
4. If Edit → Paste works but ⌘V doesn't, it's the keyboard or a shortcut conflict.
5. For single-app failures, check formatting, remote-desktop clipboard bridges, Secure Input and Accessibility permissions.

Five minutes of that covers essentially every cause. The remaining question is what you lost while you were troubleshooting — and that's the one worth solving permanently.