Quick Answer
notes-sync-ui.exe is safe. It is the Notion desktop component that coordinates note syncing, local caching, and UI updates, while delegating cloud sync to a background service.
Is it a Virus?
NO - Safe
Must be located at C:\Program Files\Notion Labs\NotesSync\notes-sync-ui.exe
Can I Disable?
YES - You can disable syncing from Notion's Settings, but cross-device updates will stop until re-enabled.
Notes Sync UI runs multiple background syncing tasks and the UI thread.
Should I Remove?
YES - If you no longer use Notion across devices, you can uninstall notes-sync-ui.exe without harming other apps.
Disabling or removing will stop sync and may impact data consistency across devices.
What is notes-sync-ui.exe?
notes-sync-ui.exe is the executable that powers the Notion Desktop Notes Sync UI. It presents the user with sync status, initiates and coordinates local note changes, and communicates with the background sync engine to keep your notebooks aligned across devices, even when offline.
Notes Sync UI coordinates with the cloud and a local cache to merge edits from multiple devices. It separates UI, storage, and syncing tasks into distinct processes to improve reliability and responsiveness.
Quick Fact: The Notes Sync UI relies on a background daemon to push edits to Notion's cloud and to fetch updates from other devices, ensuring consistency.
Types of Notes Sync Processes
- Main UI Process: Renders the Notion interface and handles user input (1 instance)
- Sync Engine Process: Manages upload/download of note changes to the cloud
- Conflict Resolver Process: Detects conflicting edits and resolves them automatically or via prompts
- Cache/Storage Process: Maintains local note cache and indexes for fast search
- Update Service Process: Checks for and applies updates from Notion servers
- Notification Service Process: Shows sync status alerts and conflict notifications to the user
Is notes-sync-ui.exe Safe?
Yes, notes-sync-ui.exe is safe when it's the legitimate Notion Desktop file from official sources or installed via the Notion app.
Is notes-sync-ui.exe a Virus or Malware?
The real file is NOT a virus. Malware may masquerade with similar names; always verify digital signatures and location.
How to Tell if notes-sync-ui.exe is Legitimate or Malware
- File Location:: Must be in
C:\Program Files\Notion Labs\NotesSync\notes-sync-ui.exe or C:\Program Files (x86)\Notion Labs\NotesSync\notes-sync-ui.exe. Any other path is suspicious.
- Digital Signature:: Right-click the file in Explorer → Properties → Digital Signatures. Should show "Notion Labs, Inc." as the signer.
- Resource Usage:: Idle CPU typically 2-5%; memory in the 60-200 MB range. Constant high usage or spikes during idle is suspicious.
- Behavior:: The process should start with Notion and run in background. If it runs when Notion is closed for long periods, investigate.
Red Flags: If notes-sync-ui.exe is located in unusual folders (like Temp or AppData), runs when Notion isn't open, has no digital signature, or uses excessive resources constantly, scan with antivirus. Be wary of similarly named files.
Why Is notes-sync-ui.exe Running on My PC?
notes-sync-ui.exe runs when you open Notion Desktop or when a background sync is scheduled to keep your local notes in sync with your Notion workspace. It manages the UI and delegates syncing tasks to the background services for continuous updates.
Reasons it's running:
- Active UI Use: You're actively using Notion on the desktop; the UI process remains active to render pages and respond to input.
- Background Sync Engine: The sync engine runs in the background to upload changes and fetch remote updates.
- Startup Launch: Notion is configured to start with Windows, launching notes-sync-ui.exe on login.
- Offline Cache Sync: The app maintains a local cache to support offline edits and rapid re-opening of notes.
- Notifications & Alerts: Status, conflicts, and update notifications may appear in the system tray or UI, indicating ongoing sync.
Can I Disable or Remove notes-sync-ui.exe?
Yes, you can disable notes-sync-ui.exe. Disabling stops syncing and UI updates, but you can re-enable later. Uninstalling removes the Notion desktop app entirely.
How to Stop notes-sync-ui.exe
- End Sync in Settings: Notion Settings → Sync → turn off automatic syncing
- Close Notion: Exit the Notion app to stop active UI sessions
- Disable Startup: Task Manager → Startup tab → Disable Notion
- Stop Background Apps: Not applicable; Notion handles background tasks within the app. Turning off Sync suffices.
- Uninstall Notion: Windows Settings → Apps → Notion → Uninstall
How to Uninstall Notion Desktop
- ✔ Windows Settings → Apps → Apps & Features → Notion → Uninstall
- ✔ Notion's own uninstaller (if present) and follow prompts
- ✔ Restart the computer after uninstall
Common Problems: High CPU or Memory Usage
If notes-sync-ui.exe is consuming excessive resources or behaving oddly:
Common Causes & Solutions
- Large number of active pages or databases: Large notes collections trigger syncing. Close unused pages or split into smaller workspaces.
- Frequent edits on multiple devices: Conflicts can cause repeated syncing; ensure offline edits are reconciled.
- Outdated Notion version: Update Notion Desktop to the latest release.
- Background sync disabled: Re-enable in Settings or re-run initial setup to re-enable caches.
- Corrupted cache: Clear cache via Notion Settings or reinstall Notion after backing up data.
- Third-party security software interference: Whitelisting Notion in antivirus and firewall settings can prevent blocks.
Quick Fixes:
1. Quick Fixes:
2. 1. Open Notion Task Manager or Settings to identify syncing tasks consuming resources
3. 2. Clear local cache or reset sync settings in Notion
4. 3. Disable unnecessary integrations and extensions
5. 4. Update Notion Desktop to the latest version
6. 5. If issues persist, restart the app or computer
Frequently Asked Questions
Is notes-sync-ui.exe safe?
Yes, notes-sync-ui.exe is safe when it is the legitimate Notion Desktop file from official Notion sources or installed via the Notion app. Verify the path and digital signature.
Why is notes-sync-ui.exe using so much CPU?
Notes Sync UI may use CPU during active syncing. Use Notion's built-in Task Manager to identify heavy pages, and limit offline edits if needed.
Can I uninstall notes-sync-ui.exe?
You can uninstall Notion Desktop from Windows Settings → Apps → Notion → Uninstall. Your local data is associated with Notion account; data may re-sync if you reinstall.
Can I disable notes-sync-ui.exe?
Yes, you can disable or stop syncing via Notion Settings. You can re-enable later. Uninstalling is an option if you no longer use Notion.
Why does notes-sync-ui.exe start with Windows?
Notes Sync UI can start at Windows login if Notion is configured to launch on startup. Disable this in Task Manager > Startup or Notion settings.
Why are there multiple notes-sync processes?
Notes Sync UI uses a multi-process architecture: UI, sync engine, and cache work separately to improve reliability. You can view related processes in Task Manager when Notion is running.