You hit Ctrl and C, went to paste, and got nothing. Or you got whatever you copied twenty minutes ago. It is a small thing that stops your whole day, and there is no obvious place to look.
Most of these clear in seconds once you know which one you have. I have put them in the order that actually solves them.
The last one is a genuine long-running fault with no confirmed fix. I would rather tell you that than pretend the list ends tidily.
1. Press each modifier key once
Two seconds, and it is the commonest cause nobody suspects.
If Windows believes Ctrl is held down, your Ctrl and C does something else entirely. It happens after unplugging a keyboard, undocking a laptop, or alt-tabbing out of a game.
Press Ctrl, then Shift, then Alt, each once on its own. Then try again.
⭐ Test with the menu rather than the shortcut. Right-click the text and choose Copy. If that works and Ctrl and C does not, the fault is the key, not the clipboard.
⚡ That distinction saves the rest of this page. A stuck modifier has its own short list. None of the clipboard steps below will touch it.
2. Check you are not fighting a size limit
Windows has two limits and neither is announced when you cross them.
Documented by Microsoft on its using the clipboard page: "Your size limitations are 4 MB per item. Text, HTML, and Bitmap file formats are supported."
And the second one: "Your clipboard history is limited to 25 copied entries."
⭐ Four megabytes goes quickly with an image. A screenshot of a large monitor, a scanned page, a big block of formatted spreadsheet. Over the limit, the paste simply does nothing.
⚡ Try the same action with a short line of plain text. If that pastes fine, you have your answer. Move the big thing as a file instead.
⚠️ Only three formats are supported by the history. Anything more exotic is not held for you, even when a straight copy and paste works.
3. Restart Windows Explorer
The single most effective step on this page, and it takes fifteen seconds.
Press Ctrl + Shift + Esc to open Task Manager. Find Windows Explorer in the Processes list, right-click it, and choose Restart.
Your taskbar blinks and comes back. Nothing you have open closes.
⭐ An owner on Microsoft's board found a cruder version of the same thing. Opening File Explorer repeatedly with Windows key and E, four or five times, brought their clipboard back without signing out.
⚡ That detail is more useful than it looks. It means the fault sits in the shell rather than in a third-party app, which narrows things considerably.
4. Turn clipboard history on and look at what is in it
Half the time nothing is broken and the copy never happened.
Microsoft's instruction: "To turn your clipboard on for the first time, select Windows logo key + V, and then select Turn on."
Press Windows key + V now. If a panel opens with your recent copies in it, the clipboard is working and something else is going on.
⭐ An empty panel right after you copied something means the copy failed. That points at the app you copied from, not at Windows.
⚡ Pin the things you paste all day. Anything pinned survives a restart, which is genuinely useful for an address or an account number.
The settings page is Start, Settings, System, Clipboard.
5. Clear the clipboard data
A stuck item can block everything behind it, and there is a button for exactly this.
Microsoft's route: on that same Clipboard settings page, "In the Clear clipboard data area, select Clear."
⚠️ That removes everything unpinned, so check the history first if there is something in there you still need.
⚡ The command line version does the same job. Open Command Prompt and run:
echo off | clip⭐ That writes an empty value over the clipboard, which clears whatever was jammed in it. Advisers on Microsoft's board recommend it and it is faster than opening Settings.
6. If you are on Remote Desktop, restart rdpclip
A whole separate cause, and it only affects people connecting to another machine.
Copy and paste across a Remote Desktop session runs through a program called rdpclip.exe on the far end. When it stops, the clipboard stops with it.
Reported by advisers on Microsoft's board. End rdpclip.exe in Task Manager on the remote machine, then relaunch it from File, Run new task, typing `rdpclip`.
⭐ That resets the clipboard channel without disconnecting. You keep your session and everything you had open.
⚠️ Do it on the machine you are connected to, not the one in front of you. That is the half people get wrong.
7. If it is one app only
Narrow it before you touch anything system-wide.
Copy from Notepad, paste into Notepad. If that works, Windows is fine and the fault belongs to whichever app was failing.
⭐ Office keeps its own clipboard alongside the Windows one. That is why Word and Excel sometimes behave differently from everything else.
⚡ A browser will refuse a paste that a page itself blocks. Some sites do exactly that on password and account number fields.
⚠️ A clipboard manager app can hold the clipboard open and stop everything else getting a look in. If you installed one, quit it and test.
⚡ And if the whole shell is misbehaving rather than just the clipboard, the notification panel is the other thing that stops responding and the same Explorer restart covers both.
8. The long-running session fault, which has no confirmed fix
Now the one I promised, and it is worth reading before you spend a day on this.
There is a fault where copy and paste works after a fresh start, then stops several hours later. It hits machines left logged in for a long time, which yours may well be. Signing out and back in restores it, without a restart.
An owner described it on Microsoft's board in June 2023, having already tried everything on this page: "I've tried the sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth fixes, I've cleared the clipboard data in Start > Settings >Clipboard, I've killed and restarted the RDP Clipboard Monitor service and Windows Explorer."
Another, in November 2023, was blunter about the advice you have probably already been given: "And please, no stupid advises with restarting explorer, dism, sfc and all the generic stuff – IT DOESN'T HELP".
A third in February 2024 took it as far as it goes: "I have been working with Microsoft Level 2 support for the past week. Reloaded Windows 11 and Office 3 times and created a new profile and still no success."
And a fourth, days later: "After working with level 1 support for 4 weeks, level 2 support for 2 weeks, I have now been escalated to level 3 support… Loading Windows 11 and Microsoft Office 3 times it still fails, it might run several hours or several days, can't seem to identify what is causing the failure."
⛔ No root cause was ever named and no fix was confirmed. The thread runs from 2023 into 2024, and your report would be the same shape as theirs.
⭐ So the practical answer for that shape is the workaround, not a repair. Sign out and back in, which costs less than a restart, or use the Explorer trick in step three.
⚠️ And the failure is not yours to feel bad about. People on that thread reinstalled Windows three times over this.
What to do if none of it helps
Being straight about where that leaves you.
⚡ Test a second user account on the same PC. If copy and paste is solid there, the fault lives in your profile rather than in Windows. Worth knowing before any reinstall.
⭐ Ours, and marked as ours: a machine that is never shut down is the shape most of these reports share. Restart it properly once a day for a week and see whether the fault stops appearing.
⚠️ On a work machine, mention it to whoever manages it. Several of the reports above are from business fleets, and yours may already be a known case there.
Status: read and measured 23 August 2026, both versions. The Windows key plus V route, the Clipboard settings page, the 4 MB per item and 25 entry limits, the supported formats and the Clear button all come from Microsoft's own page. The rdpclip and echo off routes are adviser answers from Microsoft Q&A. The long-running session fault is quoted from owners across 2023 and 2024 and has no confirmed fix.
Why has copy and paste stopped working on Windows 11?
Most often a modifier key Windows thinks is held down, or the shell needing a restart. Press Ctrl, Shift and Alt each once, then restart Windows Explorer from Task Manager. Between them those two settle the large majority in under a minute.
How do I reset the clipboard in Windows?
Go to Settings, System, Clipboard and select Clear under Clear clipboard data. That removes everything unpinned. The command line version is echo off followed by a pipe and clip, run in Command Prompt. It does the same job faster.
Why does copy and paste stop working after a few hours?
That is a known long-running fault with no confirmed cause. Owners on Microsoft's board reported it from 2023 into 2024. One escalated to Level 3 support and reinstalled Windows three times without success. Signing out and back in restores it without a full restart.
Why can I not paste into a website?
Because some pages block it deliberately, usually on password and account number fields. Test by pasting into Notepad. If that works, Windows and your clipboard are both fine and the site is the one refusing.
The Short Version
- Press Ctrl, Shift and Alt each once. A stuck modifier is the commonest cause.
- Right-click and Copy tests the menu instead of the shortcut. That splits key from clipboard.
- Windows holds 4 MB per item and 25 entries. A large image can silently exceed it.
- Restart Windows Explorer from Task Manager. Fifteen seconds and nothing closes.
- Windows key and V shows what is actually on the clipboard. An empty panel means the copy failed.
- Clear the clipboard data, or run echo off piped to clip.
- On Remote Desktop, restart rdpclip.exe on the machine you are connected to.
- The hours-later fault has no confirmed fix. Sign out and back in rather than reinstalling.
Where to Next
Press Ctrl, Shift and Alt each once, then restart Windows Explorer. Those two together take under a minute and they cover most of these.
If it comes back an hour later, stop troubleshooting and sign out instead. That shape is the known fault and nobody has fixed it by trying harder.
If only one app is affected, test with Notepad before anything else. It tells you in ten seconds whether Windows is involved at all.
And if this fault stopped for good on your machine after a specific change, tell me what it was in the comments. That thread ran two years without an answer and I would genuinely like one.
Isaac Smith is the founder and editor of PC Glance, a website that covers computers, laptops, and technology. He is a tech enthusiast and a computer geek who loves to share his insights and help his readers make smart choices when buying tech gadgets or laptops. He is always curious and updated about the latest tech trends.