Chromecast needs WiFi to work, but you have options if yours is down or unavailable

Chromecast requires a WiFi connection to cast content from your phone or computer to your TV. The device itself connects to your wireless network, receives the video stream over that connection, and displays it on your screen. If your WiFi is off, broken, or you do not have internet access, standard casting will not work.

That said, there are two real workarounds: you can set up a mobile hotspot from your phone, or you can use a wired connection through a USB adapter if you have the right hardware. Neither is as seamless as WiFi, but both let you cast when your home network is unavailable.

Key Takeaways

  • Chromecast requires WiFi to receive and display video; it cannot work over Bluetooth or a direct cable connection.
  • A mobile hotspot from your phone creates a temporary WiFi network that Chromecast can join, letting you cast as long as your phone has cellular data.
  • Chromecast with Google TV and some other models support wired ethernet through a USB-C adapter, which bypasses WiFi entirely.
  • Guest mode on Chromecast lets someone cast to your TV without knowing your WiFi password, but they still need to be on the same network.
  • Older Chromecast models do not support ethernet adapters, so a hotspot is your only option if WiFi is unavailable.

Using your phone as a hotspot to cast

The simplest workaround is to turn your phone into a WiFi hotspot. Your phone broadcasts its own wireless network using cellular data, and Chromecast can connect to it just like any other WiFi network. This works on any Chromecast model and requires no extra hardware.

On an iPhone, go to Settings > Personal Hotspot and toggle it on. On Android, go to Settings > Network & Internet > Hotspot and turn on WiFi hotspot. Your phone will display a network name and password. On your Chromecast, go to Settings > Network and select your phone's hotspot network, then enter the password. Once connected, you can cast normally from any device on that same hotspot.

The catch is that your phone is now doing double duty: it is broadcasting the network and running the app you are casting from. This drains the battery faster than normal. If you are casting video for more than an hour or two, plug your phone in. Also, if you lose cellular signal, the hotspot disappears and casting stops.

Connecting Chromecast directly with ethernet

Chromecast with Google TV and the newer Chromecast HD model support a USB-C ethernet adapter, which connects your device to your router with a cable instead of WiFi. This is the most stable option if you have the hardware and your router is within cable distance of your TV.

You will need a USB-C to ethernet adapter — Google sells an official one, but third-party adapters work as long as they support data transfer, not just charging. Plug the adapter into the USB-C port on the back of your Chromecast, connect an ethernet cable from your router to the adapter, and the device will automatically detect the wired connection. No setup required.

Older Chromecast models (the original Chromecast, Chromecast Audio, and Chromecast Ultra) do not have USB-C ports and cannot use ethernet adapters. If you own one of those, a mobile hotspot is your only option.

What does not work: Bluetooth and direct connections

Chromecast does not support Bluetooth casting. Even if your phone and Chromecast are both Bluetooth-capable, you cannot pair them and cast that way. Bluetooth does not have the bandwidth to stream video reliably, and Chromecast was never designed to use it.

You also cannot connect your phone directly to Chromecast with a cable. Chromecast is a receiver, not a display adapter. It needs a network — WiFi or ethernet — to receive the video stream from your casting device.

Guest mode when you do not want to share your WiFi password

Guest mode lets someone cast to your Chromecast without knowing your WiFi password. They still need to be on your WiFi network, but they do not need to ask you for the password or connect to it themselves. Instead, they open the Google Home app, tap your Chromecast, and select "Cast my screen" or "Cast media." A code appears on your TV, they enter it in their app, and casting begins.

This is useful when friends visit or you want to let someone cast without giving them permanent access to your network. Guest mode works on all Chromecast models and does not require any setup beyond having your Chromecast already connected to WiFi. If your WiFi is down, guest mode is not available.

Troubleshooting when casting stops working

If you were casting over a hotspot and it suddenly stopped, your phone may have lost signal or the hotspot turned off automatically. Check your phone's hotspot settings and make sure it is still on. If your phone is in low-power mode, it may have disabled the hotspot; turn off low-power mode and reactivate it.

If you are using ethernet and casting stops, unplug the adapter for 10 seconds and plug it back in. Check that the ethernet cable is fully seated in both the adapter and your router. If the cable is loose, the connection drops even though it looks plugged in.

If your Chromecast is not finding your hotspot network, make sure your phone's hotspot is on and that your Chromecast is in range. Hotspot networks sometimes have shorter range than home WiFi routers. Move your phone closer to the TV if possible.

When to replace your WiFi router instead

If your WiFi goes down frequently or you are considering a hotspot or ethernet adapter as a permanent solution, it may be time to replace your router. A new router costs between $50 and $150 and is more reliable than working around WiFi problems with workarounds.

If your router is more than five years old, it may not support modern WiFi standards and could be dropping connections. If you have a large home and Chromecast is far from the router, a mesh WiFi system (which uses multiple units to cover more area) is more effective than an adapter. If your internet service itself is unstable, contact your provider before buying new equipment.

Frequently Asked Questions

Can I cast to Chromecast if my internet is completely down?

Yes, if you use a mobile hotspot from your phone. Your phone does not need home internet to create a hotspot — it uses cellular data. Both your phone and Chromecast connect to the hotspot network, and casting works as long as your phone has signal and data.

Does Chromecast with Google TV work better with ethernet than WiFi?

Ethernet is more stable because it is not affected by interference or distance from the router. If your WiFi is slow or drops frequently, ethernet will improve streaming quality. For most homes with decent WiFi, the difference is not noticeable.

Can I use a USB-C ethernet adapter on the original Chromecast?

No. The original Chromecast, Chromecast Audio, and Chromecast Ultra do not have USB-C ports. Only Chromecast with Google TV and Chromecast HD support ethernet adapters. For older models, a mobile hotspot is your only option.

Will casting over a hotspot use a lot of my phone's data?

Yes. Streaming video uses the same amount of data whether it comes from WiFi or a hotspot. A one-hour HD video uses roughly 3 gigabytes. If your phone plan has a data cap, casting over a hotspot will count against it.

What if my Chromecast keeps disconnecting from the hotspot?

Make sure your phone's hotspot is set to stay on even when the screen locks. On iPhone, go to Settings > Personal Hotspot and check that it is enabled. On Android, some phones turn off the hotspot after a period of inactivity; disable this in your hotspot settings if the option exists.