How to Connect Iriun Webcam Over USB

Iriun Webcam turns a smartphone into a webcam for a computer. It pairs an app on the phone with a companion program on the computer. It is often used over Wi-Fi, but a USB cable can carry the video instead, which avoids depending on the local network. This guide covers the USB route, how to tell whether it is working and what to check when it isn't.

The short answer

Install Iriun on both the phone and the computer, then connect them with a cable that carries data, not just power. On Android, you also need to turn on USB debugging and accept the authorization prompt on the phone. On an iPhone, the computer must recognize and trust the phone over USB; on Windows, that means Apple's device drivers must be present. Then open both apps and choose the Iriun camera in your video-call program or browser.

The exact steps depend on the phone platform, so check which case applies to you. Menu names and supported options can also change between app versions and phone models. If a step below doesn't match your screen, Iriun's current setup instructions for your platform are the authoritative reference. This article draws on general Android, iOS and desktop behavior rather than confirmed, version-specific Iriun documentation.

Before you start

• The Iriun Webcam app installed on the phone, from the phone's official app store.
• The Iriun Webcam desktop program installed on the computer. Restart the computer if the installer asks you to.
• A USB cable that supports data transfer. Many cheap or bundled cables only charge, and a charge-only cable will power the phone without creating a connection.
• A free USB port on the computer, preferably directly on the machine rather than through an unpowered hub.
• Both apps updated to their latest available versions.

Connecting an Android phone over USB

Android only lets a computer talk to an app over USB in this way when USB debugging is enabled. USB debugging is a developer setting that allows a trusted computer to communicate with the phone over the cable. It sits in a hidden Developer options menu that you unlock first.

• 1. Open Settings, go to About phone (on some phones it is under System or Software information), and find Build number.
• 2. Tap Build number repeatedly, usually seven times, until a message says you are now a developer. You may be asked for your PIN.
• 3. Go back to Settings and open Developer options. It is often under System, or at the bottom of the main Settings list.
• 4. Turn on USB debugging and confirm the warning.
• 5. Connect the phone to the computer with the data cable.
• 6. Watch the phone screen for a prompt asking whether to allow USB debugging from this computer. Tap Allow. If you use this computer regularly, you can tick the option to always allow it.
• 7. Open the Iriun app on the phone and the Iriun program on the computer.
• 8. Check the result: the phone's camera image should appear in the Iriun window on the computer.

If the authorization prompt never appears, unplug and replug the cable. Some phones also ask what the USB connection is for. If charging-only is selected, try switching to file transfer, which on many phones makes the data link available.

Leaving USB debugging on is a minor security consideration, because it lets authorized computers access the phone more deeply. If you don't plan to use it again soon, you can switch it off in Developer options. You will need to turn it back on next time.

Connecting an iPhone over USB

iPhones have no USB debugging switch. Instead, the computer has to recognize the phone as a trusted device.

• 1. On Windows, make sure Apple's mobile device drivers are installed. They come with Apple's iTunes or Apple Devices app. If the computer doesn't show the iPhone as a connected device at all, this is the usual missing piece. Macs don't need a separate driver.
• 2. Unlock the iPhone and connect it with a data-capable cable.
• 3. When the iPhone asks whether to trust this computer, tap Trust and enter your passcode.
• 4. Open the Iriun app on the iPhone and the Iriun program on the computer.
• 5. Check the result: the iPhone's camera image should appear in the Iriun window on the computer.

Confirm in Iriun's current instructions that USB is supported for your combination of iPhone and computer before spending time troubleshooting. Supported platforms and connection methods can change, and this has not been verified here.

How to confirm the video is actually going over USB

A picture in the Iriun window proves the phone and computer are connected. It doesn't prove the cable is carrying the video, because Iriun can also connect over Wi-Fi. To check, turn off Wi-Fi on the phone while the image is showing. If the picture continues after a brief pause, the USB link is working. If the picture stops and doesn't return, the connection was relying on the network, so revisit the USB steps above. Turn Wi-Fi back on afterward if you need it.

Using the Iriun camera in calls and the browser

Once Iriun shows a picture, the phone is available to the computer as a webcam. Your call software still has to be told to use it.

• 1. In the video-call app's settings, open the video or camera section and select the Iriun camera from the list. Built-in or other webcams may be chosen by default.
• 2. In a browser-based call, select the Iriun camera in the site's device settings. When the browser asks for camera permission, allow it.
• 3. On macOS, also check System Settings, Privacy & Security, Camera, and make sure the app or browser you are using is allowed. On Windows, check Settings, Privacy & security, Camera, and make sure camera access is on for the apps you need.
• 4. Check the result: the call app's preview should show the phone's view.

These checks establish three different things. A camera name in the device list means the computer has detected the virtual camera. A moving preview means video is being captured and delivered to that app. Neither tells you how the image will look to others during a live call, because that also depends on lighting, the call service's compression and everyone's connection. A short test call with someone else, or the platform's own test feature if it has one, covers that last part.

Microphone audio is a separate question. Whether Iriun can also route the phone's microphone, and how, has not been verified here. Assume your call app is still using the computer's own microphone unless you deliberately select another input. In the call app's audio settings, confirm which microphone is selected and that its level indicator moves when you speak. A moving indicator shows input activity, not that your voice will sound clear to others.

If there's no picture

• Try a different cable. A charge-only cable is the most common cause of a USB connection that never forms.
• Try a different USB port, directly on the computer.
• On Android, check that USB debugging is still on. In Developer options, use the option to revoke USB debugging authorizations, then reconnect and accept the prompt again.
• On iPhone with Windows, confirm the computer recognizes the iPhone, and reinstall Apple's device software if it doesn't.
• Close other programs that may be holding the camera, such as another call app, then restart the Iriun program on the computer and the app on the phone.
• Update both the phone app and the desktop program, so neither is out of date relative to the other.
• If Iriun shows a picture but your call app doesn't list the camera, fully quit and reopen the call app or browser. Many programs only look for cameras when they start.
• Restart the computer, particularly if you just installed the desktop program.

What this guide doesn't cover

No confirmed, version-specific information about Iriun was available for this article. That includes exact menu labels, supported resolutions, Linux USB requirements and audio features. There are also no recommended thresholds or input-level targets that apply to this setup. If a step fails in a way not covered above, compare it with Iriun's own current instructions for your phone and computer.