Clipboard Sync Between Devices: What Works in a Browser

Short answer

Browser-based clipboard sync works while the syncing website is open. It saves what you copy inside the site and, in Chrome and Edge, what you copied in other apps when you return to the tab. On your other devices it puts the new item on the clipboard when the tab is in front. With no tab open, a website cannot sync — on a computer, MyClipCloud's free Chrome extension does that part.

The pieces involved

Copy events. The page listens for copy inside its own editor and reads the selected text. In Chrome and Edge, once you allow clipboard access, it also reads the clipboard when the tab gains focus, to pick up what you copied elsewhere.
A private API. The text is sent over HTTPS to your account, encrypted at rest and assigned an ordered sequence number.
Delivery. Signed-in sessions get a notification over a WebSocket where the server provides one, or check for new events every few seconds otherwise. Both paths use the same ordered event list.
Catch-up. A device that was offline asks for everything after the last sequence it saw, so nothing is missed or applied twice.
Local clipboard. A new text or photo is written to the device's clipboard when its MyClipCloud tab is in front. Where the browser blocks that, Copy latest does it with one click.

Supported browsers

The intended targets are current Chrome, Edge, Firefox and Safari on desktop, Chrome on Android, and Safari on iPhone and iPad. Each browser has its own permission behaviour for reading the clipboard; see the table on the home page.

Browser sync vs. system-wide sync

Need	Browser (MyClipCloud)	Native app / extension
Install required	No	Yes
Captures copies in any app	Chrome and Edge: when you return to the tab. Firefox and Safari: only inside MyClipCloud	Usually yes, at any time
Updates other device clipboard automatically	Yes, while the tab is in front	Often yes, at any time
Works on locked-down or borrowed computers	Yes, in a browser	Often not

Read the full browser vs desktop comparison.

How Clipboard Sync Works: Events, WebSockets and Device Sessions

A look inside a browser-based clipboard sync: copy events, ordered events, realtime delivery, polling fallback and catch-up.

Browser Clipboard Sharing vs Native Clipboard Sync: Feature Comparison

A feature-by-feature comparison of browser-based clipboard sharing and installed clipboard sync apps.

Cross-Device Copy and Paste on Windows, Mac, Linux, Android and iPhone

What each platform offers for copying between devices, and how a browser clipboard fills the gaps between ecosystems.