Is it a Virus?
✔ NO - Safe
Should reside in C:\Program Files\Resilio Sync\ or C:\Program Files (x86)\Resilio Sync\
Warning
Background service running
Many processes may run in background when syncing folders; look for resilio-sync-service.exe in Task Manager
Can I Disable?
✔ YES
Disabling stops background syncing; you can stop it via Windows Services or the desktop app settings
What is resilio-sync-service.exe?
resilio-sync-service.exe is the background Windows service that powers Resilio Sync, a peer-to-peer file synchronization tool. It runs continuously to monitor configured folders, coordinate delta transfers with connected devices, and manage synchronization tasks without requiring the main UI to stay open. It enables silent syncing.
The service implements the core sync engine, using P2P protocols to negotiate peers, perform block-level transfers, and maintain folder metadata. It runs as a Windows service and communicates with the desktop application via local IPC.
Quick Fact: Resilio Sync leverages a distributed peer network; data transfers directly between devices without a central server.
Types of Resilio Sync Processes
- Service Process: resilio-sync-service.exe - Windows service that coordinates syncing
- Desktop UI Process: Resilio Sync GUI handles user configuration and status
- Worker/Worker-UI: Background workers for folder monitoring and transfer scheduling
Is resilio-sync-service.exe Safe?
Yes, resilio-sync-service.exe is safe when it's the legitimate file from Resilio Inc downloaded from official sources.
Is resilio-sync-service.exe a Virus or Malware?
The real resilio-sync-service.exe is NOT a virus. Malware may masquerade under similar names; verify the file location and signature.
How to Tell if resilio-sync-service.exe is Legitimate or Malware
- File Location:: Must be in
C:\Program Files\Resilio Sync\resilio-sync-service.exe or C:\Program Files (x86)\Resilio Sync\resilio-sync-service.exe. Any other path is suspicious.
- Digital Signature:: Right-click the file in File Explorer → Properties → Digital Signatures. Should show "Resilio Inc" as signer.
- Resource Usage:: Normal idle CPU is 0-2%, memory usage 40-180 MB. Constant high resource usage when idle is suspicious.
- Behavior:: Service should run in background and be managed by Windows Services. If you see it active when not installed, scan for malware.
Red Flags: If resilio-sync-service.exe is in unusual folders (Temp, AppData, or System32), starts without user installation, lacks a valid signature, or uses excessive resources continually, run a full antivirus and malware scan. Beware of similarly named files like "resiliosync.exe".
Why Is resilio-sync-service.exe Running on My PC?
resilio-sync-service.exe runs as a Windows service or background process to coordinate folder synchronization even when the main UI is closed or the app is minimized.
Reasons it's running:
- Active Folder Sync: You have one or more shared folders configured; the service monitors them and negotiates transfers with peers.
- Background Sync and Peer Discovery: The service keeps the peer network active, discovers new peers, and maintains connectivity for ongoing syncing.
- Startup Auto-Launch: Windows startup or user login triggers the service to start so syncing can resume promptly.
- Scheduled Sync Tasks: Sync tasks and delta transfers may be scheduled, causing periodic process wakeups and activity.
- Network and NAT Traversal: The service handles NAT traversal, UPnP, and firewall traversal to maintain peer connections.
Can I Disable or Remove resilio-sync-service.exe?
Yes, you can disable resilio-sync-service. Disabling stops background syncing; you can uninstall Resilio Sync or disable startup to prevent auto-launch.
How to Stop resilio-sync-service
- Stop via Windows Services: Open services.msc, locate 'Resilio Sync Service' and Stop
- Close Desktop UI: Exit the Resilio Sync GUI to reduce background activity
- Disable Startup: Task Manager → Startup tab → Disable 'Resilio Sync' or 'Resilio Sync Service'
- Pause Auto-Sync: In the GUI, pause synchronization or disable shared folders temporarily
- Uninstall: Windows Settings → Apps → Resilio Sync → Uninstall to remove the service and UI
How to Uninstall Resilio Sync
- ✔ Windows Settings → Apps → Apps & Features → Resilio Sync → Uninstall
- ✔ Control Panel → Programs → Uninstall a program → Resilio Sync → Uninstall
- ✔ Remove residual data at C:\ProgramData\Resilio Sync and C:\Users\Public\Documents\Resilio Sync
Common Problems: High CPU, Memory, or Network Usage
If resilio-sync-service.exe is consuming excessive resources or failing to synchronize:
Common Causes & Solutions
- Too many folders or large files: Limit shared folders or exclude large directories; schedule syncs during off-peak hours
- Slow or unstable peer network: Check firewall/NAT settings, ensure peers are reachable, and review logs for blocked connections
- Outdated Resilio Sync version: Update to the latest version from official source; restart service afterward
- Conflicting or corrupt database: Back up and repair the database via the GUI or reinstall if corruption is detected
- Misconfigured shared folders permissions: Verify folder permissions; ensure user account has access to shared directories
- Antivirus or firewall interference: Allow resilio-sync-service.exe in firewall; temporarily disable AV to test
Quick Fixes:
1. Quick Fixes:
2. 1. Open Resilio Sync Task Manager or GUI to identify heavy folders
3. Update to latest version and restart service
4. Restart router/modem to refresh connections
5. Check firewall rules and allow traffic for Resilio Sync
6. Pause or skip non-critical synchronization tasks
Frequently Asked Questions
Is resilio-sync-service.exe a virus?
No, the legitimate resilio-sync-service.exe is part of Resilio Sync. Verify the file is located in C:\Program Files\Resilio Sync\ and signed by "Resilio Inc".
Why is resilio-sync-service.exe running at startup?
The service can be configured to start automatically so your synced folders resume immediately after login. Disable it in Task Manager → Startup or via Windows Services.
Can I disable the Resilio Sync service without losing my synced folders?
Yes. Disabling the service will pause syncing, but your folders remain intact. You can re-enable it to resume syncing.
How do I uninstall Resilio Sync?
Use Windows Settings → Apps → Resilio Sync → Uninstall, or use the Control Panel to remove the program. You can also delete residual data in AppData if desired.
Why is syncing slow or stuck?
Check peer connectivity, firewall rules, and folder permissions. Look into Resilio Sync logs to identify blocked or slow connections and adjust settings accordingly.
Where are the synced files stored by Resilio Sync?
Folders you choose to sync are stored at their configured locations on your disk. The UI shows paths per folder in the Sync tab.