Quick Answer
lifesize-rtc.exe is safe. It is Lifesize's desktop Real-Time Communication client responsible for calls, screen sharing, and background tasks in a multi-process architecture.
Is it a Virus?
YES
Must be in C:\Program Files\Lifesize\lifesize-rtc.exe or C:\Program Files (x86)\Lifesize\lifesize-rtc.exe
Can I Disable?
NO
Disabling lifesize-rtc.exe may stop automatic launch, notifications, and in-call features
Why is it Running?
Lifesize runs to manage calls, audio/video streams, and notifications
Lifesize may start a call or background service when needed
What is lifesize-rtc.exe?
lifesize-rtc.exe is the core executable for Lifesize's desktop Real-Time Communication client. It launches to enable video calls, screen sharing, and collaboration features. Lifesize uses multiple processes to isolate media handling, UI tasks, and background services for stability and security during conferences.
This architecture isolates media streams and UI tasks so a single problematic tab or call won't crash the entire app, while tight sandboxing helps protect system resources during conferences.
Quick Fact: Lifesize assigns dedicated processes for media capture, encoding/decoding, and signaling to maintain call quality even if one component encounters issues.
Types of Lifesize Processes
- Main Process: User interface, lifecycle management, and settings
- Call Engine Process: Handles audio/video capture, encoding/decoding, and media transport
- Renderer / UI Process: Renders in-call overlays and UI components
- Audio Subsystem Process: Manages microphone and speaker interactions
- Screen Sharing Process: Manages screen capture and broadcast streams
- Update / Background Service: Checks for updates and maintains background tasks
Is lifesize-rtc.exe Safe?
Yes, lifesize-rtc.exe is safe when it's the legitimate Lifesize desktop client file downloaded from lifesize.com or authenticated installers.
Is lifesize-rtc.exe a Virus or Malware?
The real lifesize-rtc.exe is NOT a virus and is digitally signed by Lifesize, Inc. Malware may disguise itself with similar names.
How to Tell if lifesize-rtc.exe is Legitimate or Malware
- File Location:: Must be in
C:\Program Files\Lifesize\lifesize-rtc.exe or C:\Program Files (x86)\Lifesize\lifesize-rtc.exe. Any lifesize-rtc.exe elsewhere is suspicious.
- Digital Signature:: Right-click the file in its directory > Properties > Digital Signatures. Should show "Lifesize, Inc.".
- Resource Usage:: Normal usage is 2-15% CPU per active call, 120-350 MB total memory when idle. Unusually high usage when idle is suspicious.
- Behavior:: Lifesize should launch when you start the application or join a meeting. Background persistence when Lifesize isn't installed is suspicious.
Red Flags: If lifesize-rtc.exe is located in unusual folders (like Temp, AppData\Roaming, or System32), runs when Lifesize isn't open, has no digital signature, or uses excessive resources constantly, scan your system with antivirus software immediately. Be wary of similarly named files like "lifesize-rtc32.exe" from untrusted sources.
Why Is lifesize-rtc.exe Running on My PC?
lifesize-rtc.exe runs when you start Lifesize's desktop client or when a call is initiated, and it may stay active to manage ongoing conferences and background notifications.
Reasons it's running:
- Active Call or Meeting: You're currently in a Lifesize call or meeting; the process handles media streams and call signaling.
- Background Notifications: The app maintains background services for chat, presence, and call alerts even when minimized.
- Startup or Auto-Launch: Lifesize is configured to start when Windows starts for quick access to meetings.
- Screen Sharing or Recording: Starting screen share or recording engages dedicated media components that run within lifesize-rtc.exe.
- Background Sync: Lifesize may sync settings, history, and preferences with your Lifesize account, keeping the client active.
Can I Disable or Remove lifesize-rtc.exe?
Yes, you can disable lifesize-rtc.exe. Disabling may stop you from joining meetings, receiving notifications, or using core Lifesize features.
How to Stop lifesize-rtc.exe
- End Individual Sessions: In Lifesize, end ongoing calls; if needed, use Task Manager to end the lifesize-rtc.exe process.
- Close the Application: Exit Lifesize completely via the system tray icon or by closing all windows.
- Disable Startup: Task Manager > Startup tab > Disable Lifesize
- Quit Background Services: In Lifesize settings, navigate to System > Background and disable non-essential background tasks.
- Prevent Background Launch: Uncheck options like 'Start Lifesize on Windows startup' to prevent automatic launching.
How to Uninstall Lifesize
- ✔ Windows Settings → Apps → Apps & Features → Lifesize → Uninstall
- ✔ Control Panel → Programs → Uninstall a program → Lifesize → Uninstall
- ✔ If you need Lifesize features again, reinstall from lifesize.com or the official store
Common Problems: High CPU or Memory Usage
If lifesize-rtc.exe is consuming excessive resources:
Common Causes & Solutions
- Multiple active calls or large meeting with many participants: Each active call consumes CPU and bandwidth. Leave idle meetings and close unnecessary sessions.
- Background notifications and chat activity: Disable non-critical notifications in Lifesize Settings → Notifications.
- Outdated Lifesize version: Update to the latest Lifesize client from the official site.
- Hardware acceleration issues: Toggle Settings → System → Use hardware acceleration when available; restart Lifesize.
- Corrupted cache or profile data: Clear Lifesize cache and, if needed, sign out and back in to refresh profile data.
- Third-party peripherals or drivers: Update audio/video drivers and disconnect problematic devices to test behavior.
Quick Fixes:
1. Open Lifesize Task Manager (or Windows Task Manager) to identify heavy processes, and end the problematic session if needed.
2. Clear local cache in Lifesize settings and reload the client.
3. Disable non-essential background features (auto-record, persistent notifications).
4. Update Lifesize to the latest version.
5. Ensure hardware acceleration is enabled in Lifesize settings if supported by your GPU.
Frequently Asked Questions
Is lifesize-rtc.exe safe?
Yes. The legitimate lifesize-rtc.exe is Lifesize's desktop client and should be signed by Lifesize, Inc. If you find it outside the standard install paths or lacking a valid signature, scan for malware.
Why is lifesize-rtc.exe running in the background when I’m not in a meeting?
Lifesize can run background services for notifications, presence updates, and quick-start capabilities. You can disable startup and background features if you don’t use them.
Can I uninstall Lifesize without losing meeting history?
Uninstalling Lifesize will remove the client locally. If you rely on cloud history, sign in after reinstall to sync meetings and settings.
How do I stop Lifesize from starting at startup?
Open Task Manager → Startup tab → Find Lifesize and disable it. This prevents lifesize-rtc.exe from launching on login.
How do I update Lifesize to fix performance issues?
In Lifesize, go to Settings → Help → Check for updates. Install the latest version to benefit from performance improvements and bug fixes.
Why are there multiple Lifesize processes like lifesize-rtc.exe, media.exe, and update.exe?
Lifesize uses a multi-process architecture to isolate media handling, UI tasks, and background services to improve stability and security during calls.