How to Block Websites From Accessing Your Clipboard in Chrome

Chrome's clipboard settings explained

Chrome has built-in clipboard permission controls, but they're easy to overlook and have gaps that a dedicated extension fills more completely.

Here's what the native settings offer and where they fall short.

Chrome's built-in clipboard permissions

Go to: Settings → Privacy and Security → Site Settings → scroll down to "Clipboard."

You'll see a list of sites that have been granted clipboard read access, along with a global default (usually "Ask when a site wants to see text and images copied to the clipboard").

• From here you can:
• Revoke clipboard access from sites that have it
• Change the default to "Block" (which prevents the permission prompt from appearing at all)
• Add specific sites to allow or block lists

This is a good first step. Go through the existing grants and remove anything you don't recognize or actively use.

Limitations of the built-in settings

Chrome's clipboard controls only manage the 'navigator.clipboard.readText()' API path — the modern async clipboard API.

They don't fully govern all clipboard interaction methods. Some legacy methods using 'document.execCommand' behave differently. And the permission model has historically had edge cases around focus state and same-origin frames.

More importantly: even with "Block" as the default, you have to manually manage the list. Sites you've previously granted access to retain that access until you manually revoke it. There's no notification when a site tries to read your clipboard and gets blocked.

For most users, the built-in controls are a starting point but not a complete solution.

Using Clipboard Guard for active protection

Clipboard Guard adds active interception on top of Chrome's native controls.

Install it from the Chrome Web Store. When any site attempts a clipboard read or write operation, the extension intercepts the call before it reaches the browser's permission layer.

What this gives you that the native settings don't:

• Notifications when clipboard access is attempted, even if it's blocked
• A log of which sites have tried to access your clipboard
• Separate controls for read vs. write access
• Protection for clipboard writes (which Chrome's native settings don't block)

Setting it up

After installing, open the extension settings (click the icon, then the gear):

1. Set "Clipboard Reads" to "Block All" or "Ask Each Time" depending on your preference
2. Set "Clipboard Writes" to "Block All" or "Ask Each Time"
3. Add any sites you trust to the whitelist — your password manager, your email client, any tool where clipboard paste is core to the workflow

For maximum protection: block all reads and writes by default, whitelist only sites where you actively use clipboard paste.

For convenience: allow reads on trusted sites, block on all others, and always block writes.

Verifying it's working

Visit a site that tests clipboard API access (search "clipboard API test" — several exist). With Clipboard Guard active, a clipboard read attempt should trigger a notification from the extension rather than the browser's permission dialog, and the read should return empty or be blocked.

Conclusion

Locking down clipboard access in Chrome takes two steps: update the native settings to revoke existing grants and set a restrictive default, then add Clipboard Guard for active interception and logging. Together they close the gap between what Chrome's built-in controls offer and what a full privacy posture requires.