Is it a Virus?
✔ NO - Safe
Must be in C:\Program Files\Resilio Sync\resilio-sync.exe or C:\Program Files (x86)\Resilio Sync\resilio-sync.exe
Warning
Many processes normal
Resilio Sync uses multiple worker processes for folder synchronization and network I/O
Can I Disable?
✔ YES
You can stop syncing, exit the app, or disable startup; network sharing will pause while the app is closed
What is resilio-sync.exe?
resilio-sync.exe is the executable for the Resilio Sync peer-to-peer file synchronization client. It runs in the background to continuously sync chosen folders with peers, using a distributed BitTorrent-based protocol to transfer file blocks securely and efficiently across devices.
Resilio Sync operates without central servers, using peer-to-peer connections to distribute file blocks among devices. It maintains a catalog of shared folders and uses LAN/WAN discovery to locate peers and sync updates efficiently.
Quick Fact: Resilio Sync popularized encrypted peer-to-peer folder synchronization and works with both local networks and the internet.
Types of Resilio Sync Processes
- Core Service: Main synchronization engine and UI (1 instance)
- Worker Threads: Background tasks and network I/O per shared folder
- Discovery Process: LAN and WAN device discovery for peers
- Web UI Process: Local web UI for remote management (if enabled)
- Scheduler/Update: Scheduled tasks and automatic updates
- Cache/Storage: Local cache and metadata storage
Is resilio-sync.exe Safe?
Yes, resilio-sync.exe is safe when downloaded from the official Resilio website or trusted distributors (resilio.com, or Microsoft Store).
Is resilio-sync.exe a Virus or Malware?
The real resilio-sync.exe is NOT a virus. However, malware can disguise itself with similar names. Verify file location and digital signature.
How to Tell if resilio-sync.exe is Legitimate or Malware
- File Location:: Must be in
C:\Program Files\Resilio Sync\resilio-sync.exe or C:\Program Files (x86)\Resilio Sync\resilio-sync.exe. Any other location is suspicious.
- Digital Signature:: Right-click the file → Properties → Digital Signatures. Should show a signature from "Resilio, Inc." or official certificates.
- Resource Usage:: Normal usage is 1-12% CPU per core and 60-300 MB memory. Constant high usage when idle is suspicious.
- Behavior:: Resilio Sync should launch on user action or at system startup if configured. Unexpected background behavior warrants malware scan.
Red Flags: If resilio-sync.exe is located in Temp, AppData, or other unusual folders, lacks a valid digital signature, or runs without user action, scan your system with antivirus software and consider reinstallation from official sources.
Why Is resilio-sync.exe Running on My PC?
Resilio Sync runs to keep your shared folders synchronized with peers. It also uses background services to monitor folder changes and re-establish connections as devices come online.
Reasons it's running:
- Active Folder Sync: You have one or more folders selected for synchronization with peers; the client runs to monitor and transfer changes.
- Background Monitoring: The app watches for file updates and handles changes with minimal user action.
- Startup/Auto-Launch: Resilio Sync is configured to start with Windows or your OS login.
- Peer Discovery: LAN or WAN discovery enables connections to other devices sharing the same folders.
- Network Changes: When network state changes (new adapter, VPN, or firewall), it re-establishes peer connections.
Can I Disable or Remove resilio-sync.exe?
Yes, you can disable resilio-sync.exe. You can pause syncing, quit the app, or disable startup. Uninstall if you no longer need file synchronization.
How to Stop resilio-sync.exe
- Pause or Quit: Use the system tray icon to pause syncing or quit the application.
- Close UI: Close the Resilio Sync window to stop foreground activity.
- Disable Startup: In Windows Task Manager → Startup, disable Resilio Sync.
- Pause Shared Folders: In the app, uncheck shared folders or pause synchronization for each folder.
- Stop Background Service: On some systems, disable the background service named 'Resilio Sync' via Services.msc.
How to Uninstall Resilio Sync
- ✔ Windows Settings → Apps → Apps & Features → Resilio Sync → Uninstall
- ✔ Control Panel → Programs → Uninstall a program → Resilio Sync → Uninstall
- ✔ Restart your computer after removal
Common Problems: High CPU, Disk, or Network Usage
If resilio-sync.exe is using excessive system resources, try targeted steps below to optimize performance.
Common Causes & Solutions
- Large number of shared folders: Limit the number of folders synchronized or adjust per-folder bandwidth limits in the app settings.
- Active file transfers: Pause non-essential transfers or schedule syncs during off-peak hours.
- Disk I/O contention: Ensure drives have sufficient I/O bandwidth; exclude the sync folder from antivirus real-time scanning when safe.
- Network congestion: Set per-folder bandwidth limits and enable local LAN discovery to reduce external traffic.
- Outdated Resilio Sync: Update to the latest version from official site to fix performance bugs.
- Antivirus interference: Add Resilio Sync folders to antivirus exclusions to avoid scanning every file change.
Quick Fixes:
1. Quick Fixes:
2. 1. Open Resilio Sync → Settings → Bandwidth to set limits
3. Pause non-essential folders
4. Disable real-time antivirus scanning of sync folders if safe
5. Restart the Resilio Sync service or app
6. Check for updates and install the latest version
Frequently Asked Questions
Is resilio-sync.exe safe to run on Windows?
Yes, when downloaded from the official Resilio site or verified distributors; ensure the file is located at C:\Program Files\Resilio Sync\resilio-sync.exe and signed by Resilio, Inc.
Is resilio-sync.exe a virus?
No, the legitimate Resilio Sync executable is not a virus. If you see it in unexpected locations or without a signature, run a security scan.
How do I disable Resilio Sync?
From the app tray icon choose Pause, then in Task Manager disable startup, or stop the Resilio Sync service. You can also uninstall if needed.
How do I uninstall Resilio Sync?
Use Windows Settings → Apps → Apps & Features → Resilio Sync → Uninstall. Reboot afterward.
How do I add folders to sync with Resilio Sync?
Open the app, click Add Folder, choose a local folder, and specify a peer or device to sync with, adjusting permissions as needed.
Why does Resilio Sync use bandwidth even when idle?
It monitors a folder for changes and may perform metadata syncing; ensure sleep/idle settings and per-folder bandwidth are configured to minimize idle traffic.