Show your design on a TV — cast or screen-mirror

RoomSketch3D doesn't have its own Cast button — but your browser and your phone already know how to put any screen on a TV. Here's the quickest way on each device, plus the app's full-screen button and the 3D walk-through so the picture fills the TV.

5 min readUpdated 2026-11-02

Walking a family member through a new kitchen is easier on the living-room TV than huddled around a laptop. RoomSketch3D doesn't need a special feature for this: Chrome can cast a browser tab, and phones, tablets, and Macs can mirror their whole screen. Whatever you see on your device — the plan, the 3D view, a walk-through — appears on the TV.

These are features of your browser and your device, not of RoomSketch3D, so the exact menu names can differ a little between versions and brands. The steps below follow Google's and Apple's own help pages (listed under Sources). What RoomSketch3D adds is a full-screen button that hides everything but your design, and a walk-through that shows each room at eye level — the two things that make a design read well on a big screen.

What you'll need

•A TV that accepts casting or screen mirroring (Chromecast, Google TV, a TV with Chromecast built-in, Apple TV or an AirPlay-compatible TV) — or an HDMI cable
•Your device and the TV on the same Wi-Fi network

Step by step

1
Open your design and the view you want to show
Open the design, then click View in 3D (the cube button in the toolbar above the plan). Tick Dollhouse for a view of the whole home, or walk inside to show a room at eye level. This is what your TV will show — the 3D view fills the browser window.
The 3D view fills the window — this is what you'll see on the TV.
2
On a computer: go full screen first
In the editor, click the full-screen button — four corner brackets at the end of the toolbar, next to Fit (its tooltip reads Enter fullscreen — bigger workspace). The browser's address bar, tabs and bookmarks — and RoomSketch3D's own top bar — disappear, and the design gets the whole screen, so the TV shows your plan rather than your browser. Open View in 3D after going full screen and the 3D view fills the TV too.
The full-screen button sits at the end of the toolbar, next to Fit.
3
Leave full screen when you're done
While you're in full screen an Exit Fullscreen button floats at the top right of the plan. Click it, press Esc, or click the toolbar button again to get your browser back.
In full screen only the design shows; Exit Fullscreen (or Esc) brings the browser back.
4
On a computer: cast the tab from Chrome
In Google Chrome, open the ⋮ menu at the top right and choose Cast… (in newer versions it's under Cast, save, and share → Cast…). Pick your TV from the list. If Chrome offers Sources, choose Cast tab so only the RoomSketch3D tab goes to the TV. To stop, open the same menu and click Stop casting — or click the Cast icon to the right of the address bar and choose Stop casting. This works with Chromecast, Google TV, and TVs with Chromecast built-in (Google Cast). Your computer and the TV must be on the same Wi-Fi network, and Chrome should be up to date.
5
On an iPhone or iPad: Screen Mirroring
Open Control Center (swipe down from the top-right corner), tap Screen Mirroring, and choose your Apple TV or AirPlay-compatible TV. If a code appears on the TV, type it on your iPhone or iPad. Your whole screen appears on the TV, so it works in the RoomSketch3D app and in Safari alike. Turn your device sideways for a wider picture. To stop, open Control Center, tap Screen Mirroring, then Stop Mirroring. On a Mac, use Control Center → Screen Mirroring the same way.
6
On a phone or tablet: hide the top bars
Phones and tablets can't hide the browser the way a computer can, so RoomSketch3D has its own maximize button — the four corner brackets at the end of the toolbar row. Tap it and the top bars (design name, floor selector, Plan settings) fold away so the plan gets the whole screen; tap it again to bring them back. Then open 3D — the 3D view already fills the screen. With screen mirroring on, the TV shows the same thing.
On a phone, the maximize button hides the top bars so the plan fills the screen you're mirroring.
7
On Android: Cast or Screen cast
Swipe down from the top of the screen to open Quick Settings and tap Cast or Screen cast (Samsung calls it Smart View; you may need to edit Quick Settings to add the tile). Choose your TV. Your whole screen, including the RoomSketch3D app, appears on the TV.
8
Walk through it together
Keep controlling everything from your own device — orbit, zoom, tap a room's beacon to jump into it, or walk through with the joystick. Everyone in the room follows along on the TV. For a tour at eye level, tap the walk-through button (footprints, bottom right of the 3D view). On a computer move with W A S D, drag to look, hold Shift to go faster and press Esc to stop; on a touch screen, drag to look and use the joystick to move. Tick High quality for sharper materials and lighting on a big screen — or untick it if the picture on the TV stutters.
Walk-through shows each room at eye level, which reads well on a TV. High quality sharpens materials.

Tips

No casting device? Use a cable

An HDMI cable from your laptop to the TV is the most reliable option and has no delay — the TV simply becomes a second screen.

Fill the TV

Make the browser window full screen before you open the 3D view — RoomSketch3D's full-screen button does this in one click — and turn phones and tablets sideways, so the picture uses the whole TV.

Choppy on the TV?

Casting sends live video over Wi-Fi, so fast movement can look less smooth on the TV than on your device. Move a little slower, turn off High quality, or close other tabs and apps.

Plan the tour before you start

Decide the order of rooms first — front door, kitchen, living room, bedrooms — and walk it once on your own. A tour that follows the way people actually move through the home is far easier to follow on a TV than jumping between rooms.

Common mistakes

Looking for a Cast button inside RoomSketch3D

There isn't one — casting and mirroring come from your browser or your device, as shown above.

Device and TV on different networks

If your TV doesn't appear in the list, check that both are on the same Wi-Fi network (not a guest network) and that the TV is switched on.

Showing the whole browser on the TV

Casting a non-full-screen window puts your tabs, address bar and bookmarks on the TV and shrinks the design. Click the full-screen button first.

Frequently asked questions

Does RoomSketch3D have a Cast button?

No. Use Chrome's Cast on a computer, or your phone, tablet, or Mac's own screen mirroring. Both show exactly what's on your screen, including the 3D view.

Can I cast from the iPhone, iPad, or Android app?

Use your device's screen mirroring — Screen Mirroring in Control Center on iPhone and iPad, Cast or Screen cast in Quick Settings on Android. It mirrors the whole screen, so the app appears on the TV.

Which browser should I use on a computer?

Chrome, which has Cast built in. On a Mac you can also mirror the whole screen to an Apple TV or AirPlay-compatible TV from Control Center, whichever browser you use.

Can someone else control the design from the TV?

No — the TV only shows your screen. You control everything from your own device.

Can I show a picture instead of casting live?

Yes. Save a picture of the 3D view (see Save a picture of your 3D view) and open it on the TV, or share a read-only link to your design.

Does the full-screen button work on an iPad?

Safari on iPad can't make a web page truly full screen, so on an iPad the button does the next best thing: it hides RoomSketch3D's top bars so the plan gets as much of the screen as possible.

Sources

Google Chromecast Help — Cast from Chrome to your TV — Chrome's More → Cast, save, and share → Cast… path, Stop casting from the Cast icon, and the same-Wi-Fi requirement.
Apple Support — Use AirPlay to stream video or mirror the screen of your iPhone or iPad — Control Center → Screen Mirroring, the on-screen code, Stop Mirroring, and the same-Wi-Fi requirement.

Start designing your room

Put this into practice in the floor plan maker: draw it, furnish it, walk through it in 3D — on web, iOS, and Android.

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