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Cast screen (device-to-device screen sharing)

Runs in your browserNothing is uploadedThis runs entirely in your browser. Nothing is uploaded.

Show this computer's screen, a window, or a single tab on another device's browser. Share a six-digit number and that is the whole setup. The picture never passes through a server — it goes straight between the devices.

Role
Disconnected
This device cannot send its screen: phone and tablet browsers are not given a way to capture the display. It works as the receiving side.

Your number

Give this number to the other device and your screen appears there.

Press Choose a screen and cast; it will appear here

Picture and sound flow directly between the devices. The server relays only what is needed to open the connection.

1Share the numberSix digits, shownon this page2They enter itSame page,same number3The screen appearsPicture and soundarrive directlyOnly a computer can send. Any device can receive.
Only connection details pass through the server. Picture and sound go straight between the devices.

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Why this one

The picture never reaches a server
The signalling server relays only the few kilobytes needed to open a connection. Picture and sound travel directly between the two devices, so nothing you show is ever held by us. Internal material stays between the people looking at it.
Nothing to install
A browser on each end is the whole requirement. A meeting-room television, the machine at the next desk, a tablet in your hand — open the page, type six digits, and the screen is there. Nobody has to be talked through an installer.
Pick a window, not everything
You can share one window or a single tab rather than the whole screen, so notifications and unrelated work stay private. Choosing a tab also carries that tab audio along with the picture.

How to use it

  1. Share the number

    Give the six digits shown on this page to whoever should see your screen.

  2. They enter it

    They open this same page, type the number and press Connect.

  3. Choose what to show

    Press Cast and pick a screen, a window, or a tab.

Worth knowing

A phone screen cannot be sent
Neither iOS nor Android exposes screen capture to the browser. Capturing the display is an operating-system capability that is not offered to web pages, which is exactly why AirPlay and Android casting are separate native mechanisms. The sending side has to be a computer; the receiving side can be anything.
It will not always connect
Devices on the same Wi-Fi connect essentially every time. Devices on different networks sometimes cannot, depending on the equipment between them. This tool keeps no relay server, so in that case it simply says it cannot connect — the trade for that is that your picture never travels through anyone else machine.
Sound travels too
Choosing a browser tab carries that tab audio with the picture. For a whole screen or a window, whether audio is included depends on the operating system and browser. The sending side is muted locally so you do not hear yourself echoed back.
Quality and delay
Both adapt to the connection. On the same Wi-Fi the delay is barely noticeable. Fast-moving content can soften small text; when text is the point, sharing a window or a tab looks considerably sharper than sharing the whole screen.

Questions

Do I need an account?
No. Both sides just open this page.
Is what I show stored anywhere?
No. Picture and sound go directly between the devices; the server relays only connection details.
Can I cast a phone screen?
No — browsers are not given access to the device display. A phone works fine as the receiving side.
How many people can watch?
Everyone in the same numbered room. Each additional viewer uses more of the sender upload.
How do I stop?
Press Stop casting, or use the stop-sharing control your browser shows. Either works.
Is the number reused?
A fresh one is made each time the page opens, and it stops working once you close it.
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