Disable Sync Host

Overview

About this script

This script improves your privacy on Windows.

These changes use Windows system commands to update your settings.

This script turns off the Sync Host (OneSyncSvc) service.

This service syncs mail, contacts, calendars, and other user data across devices and apps 1.

Disabling this service stops the automatic sharing of personal information, enhancing privacy.

This script is recommended for individuals prioritizing the security of their personal data over the functionality of data synchronization.

Caution

Mail and other applications relying on synchronized data may not perform as intended without this service 1.

This script uses Batch (batchfile) scripting language.

Use with Caution

This script is only recommended if you understand its implications. Some non-critical or features may no longer function correctly after running this script.

Implementation Details

• Language: batch

• Required Privileges: Administrator rights

• Compatibility: Windows only

• Reversibility: Can be undone using provided revert script

Explore Categories

Disable synchronization of mail, contacts, calendar, and user data

This action belongs to Disable synchronization of mail, contacts, calendar, and user data category. This category contains scripts that improve privacy by turning off services that synchronize mail, contacts, calendars, and other user data. Turning off these services stops the automatic sharing and storing of personal information across devices and apps, crucial for privacy. Read more on category page ▶

Disable non-essential services

This action belongs to Disable non-essential services category. This category contains scripts designed to enhance privacy by disabling system services that are not essential for your operating system's core functions. A Windows service is a program that runs in the background, automatically starting and operating without direct user interaction, even when... Read more on category page ▶

Remove bloatware

This action belongs to Remove bloatware category. This category configures Windows using 215 scripts. These scripts are organized in 35 categories. The category includes 1 subscripts and 9 subcategories that include more scripts and categories. Read more on category page ▶

Apply now

Choose one of three ways to apply:

1. Automatically via privacy.sexy: The easiest and safest option.
2. Manually by downloading: Requires downloading a file.
3. Manually by copying: Advanced flexibility.

Alternative 1. Apply with Privacy.sexy

privacy.sexy is free and open-source application that lets securely apply this action easily.

Open privacy.sexy

You can fully restore this action (revert back to the original behavior) using the application.

privacy.sexy instructions

1. Open or download the desktop application
2. Search for the script name: Disable Sync Host.
3. Check the script by clicking on the checkbox.
4. Click on Run button at the bottom of the page.

Alternative 2. Download

Irreversible Changes

This script is irreversible, meaning there is no straightforward method to restore changes once applied. Exercise caution before running, restoring it may not be possible.

1. Download the script file by clicking on the button below:

   Download script

2. Run the script file by clicking on it.

Download revert script

This file restores your system to its original state, before this script is applied.

Download restore script

Alternative 3. Copy

This is for advanced users. Consider automatically applying or downloading the script for simpler way.

1. Open Command Prompt as administrator.

HELP: Step-by-step guide

1. Click on Start menu

   Windows 11

   

   Windows 10

   

2. Type cmd

   Windows 11

   

   Windows 10

   

3. Right click on Command Prompt select Run as administrator

   Windows 11

   

   Windows 10

   

4. Click on Yes to run Command Prompt

   Windows 11

   

   Windows 10

   

---

Windows 11

Windows 10

2. Copy the following code:

Code to apply changes

:: Disable per-user "OneSyncSvc" service for all users
:: Disable the service `OneSyncSvc` 
PowerShell -ExecutionPolicy Unrestricted -Command "$serviceQuery = 'OneSyncSvc'; $stopWithDependencies= $false; <# -- 1. Skip if service does not exist #>; $service = Get-Service -Name $serviceQuery -ErrorAction SilentlyContinue; if(!$service) { Write-Host "^""Service query `"^""$serviceQuery`"^"" did not yield any results, no need to disable it."^""; Exit 0; }; $serviceName = $service.Name; Write-Host "^""Disabling service: `"^""$serviceName`"^""."^""; <# -- 2. Stop if running #>; if ($service.Status -eq [System.ServiceProcess.ServiceControllerStatus]::Running) { Write-Host "^""`"^""$serviceName`"^"" is running, attempting to stop it."^""; try { Write-Host "^""Stopping the service `"^""$serviceName`"^""."^""; $stopParams = @{ Name = $ServiceName; Force = $true; ErrorAction = 'Stop'; }; if (-not $stopWithDependencies) { $stopParams['NoWait'] = $true; }; Stop-Service @stopParams; Write-Host "^""Stopped `"^""$serviceName`"^"" successfully."^""; } catch { if ($_.FullyQualifiedErrorId -eq 'CouldNotStopService,Microsoft.PowerShell.Commands.StopServiceCommand') { Write-Warning "^""The service `"^""$serviceName`"^"" does not accept a stop command and may need to be stopped manually or on reboot."^""; } else { Write-Warning "^""Failed to stop service `"^""$ServiceName`"^"". It will be stopped after reboot. Error: $($_.Exception.Message)"^""; }; }; } else { Write-Host "^""`"^""$serviceName`"^"" is not running, no need to stop."^""; }; <# -- 3. Skip if service info is not found in registry #>; $registryKey = "^""HKLM:\SYSTEM\CurrentControlSet\Services\$serviceName"^""; if (-Not (Test-Path $registryKey)) { Write-Host "^""`"^""$registryKey`"^"" is not found in registry, cannot enable it."^""; Exit 0; }; <# -- 4. Skip if already disabled #>; if( $(Get-ItemProperty -Path "^""$registryKey"^"").Start -eq 4) { Write-Host "^""`"^""$serviceName`"^"" is already disabled from start, no further action is needed."^""; Exit 0; }; <# -- 5. Disable service #>; try { Set-ItemProperty -LiteralPath $registryKey -Name "^""Start"^"" -Value 4 -ErrorAction Stop; Write-Host 'Successfully disabled the service. It will not start automatically on next boot.'; } catch { Write-Error "^""Failed to disable the service. Error: $($_.Exception.Message)"^""; Exit 1; }"
:: Disable per-user "OneSyncSvc" service for individual user accounts
:: Disable the service `OneSyncSvc_*` 
PowerShell -ExecutionPolicy Unrestricted -Command "$serviceQuery = 'OneSyncSvc_*'; $stopWithDependencies= $false; <# -- 1. Skip if service does not exist #>; $service = Get-Service -Name $serviceQuery -ErrorAction SilentlyContinue; if(!$service) { Write-Host "^""Service query `"^""$serviceQuery`"^"" did not yield any results, no need to disable it."^""; Exit 0; }; $serviceName = $service.Name; Write-Host "^""Disabling service: `"^""$serviceName`"^""."^""; <# -- 2. Stop if running #>; if ($service.Status -eq [System.ServiceProcess.ServiceControllerStatus]::Running) { Write-Host "^""`"^""$serviceName`"^"" is running, attempting to stop it."^""; try { Write-Host "^""Stopping the service `"^""$serviceName`"^""."^""; $stopParams = @{ Name = $ServiceName; Force = $true; ErrorAction = 'Stop'; }; if (-not $stopWithDependencies) { $stopParams['NoWait'] = $true; }; Stop-Service @stopParams; Write-Host "^""Stopped `"^""$serviceName`"^"" successfully."^""; } catch { if ($_.FullyQualifiedErrorId -eq 'CouldNotStopService,Microsoft.PowerShell.Commands.StopServiceCommand') { Write-Warning "^""The service `"^""$serviceName`"^"" does not accept a stop command and may need to be stopped manually or on reboot."^""; } else { Write-Warning "^""Failed to stop service `"^""$ServiceName`"^"". It will be stopped after reboot. Error: $($_.Exception.Message)"^""; }; }; } else { Write-Host "^""`"^""$serviceName`"^"" is not running, no need to stop."^""; }; <# -- 3. Skip if service info is not found in registry #>; $registryKey = "^""HKLM:\SYSTEM\CurrentControlSet\Services\$serviceName"^""; if (-Not (Test-Path $registryKey)) { Write-Host "^""`"^""$registryKey`"^"" is not found in registry, cannot enable it."^""; Exit 0; }; <# -- 4. Skip if already disabled #>; if( $(Get-ItemProperty -Path "^""$registryKey"^"").Start -eq 4) { Write-Host "^""`"^""$serviceName`"^"" is already disabled from start, no further action is needed."^""; Exit 0; }; <# -- 5. Disable service #>; try { Set-ItemProperty -LiteralPath $registryKey -Name "^""Start"^"" -Value 4 -ErrorAction Stop; Write-Host 'Successfully disabled the service. It will not start automatically on next boot.'; } catch { Write-Error "^""Failed to disable the service. Error: $($_.Exception.Message)"^""; Exit 1; }"

3. Right click on command prompt to paste it.
4. Press Enter to apply remaining code.

Copy restore code

Copy and run the following code to restore changes:

Revert code

:: Restore per-user "OneSyncSvc" service to its default configuration for all users
:: Restore the service `OneSyncSvc` 
PowerShell -ExecutionPolicy Unrestricted -Command "$serviceQuery = 'OneSyncSvc'; $defaultStartupMode = 'Automatic'; <# -- 1. Skip if service does not exist #>; $service = Get-Service -Name $serviceQuery -ErrorAction SilentlyContinue; if (!$service) { Write-Warning "^""Service query `"^""$serviceQuery`"^"" did not yield and results. Revert cannot proceed."^""; Exit 1; }; $serviceName = $service.Name; Write-Host "^""Restoring registry settings for service `"^""$serviceName`"^"" to default startup mode `"^""$defaultStartupMode`"^""."^""; <# -- 2. Skip if service info is not found in registry #>; $registryKey = "^""HKLM:\SYSTEM\CurrentControlSet\Services\$serviceName"^""; if (-Not (Test-Path $registryKey)) { Write-Warning "^""`"^""$registryKey`"^"" is not found in registry. Revert cannot proceed."^""; Exit 1; }; <# -- 3. Enable if not already enabled #>; $defaultStartupRegValue = switch ($defaultStartupMode) { 'Boot'      { 0 }; 'System'    { 1 }; 'Automatic' { 2 }; 'Manual'    { 3 }; 'Disabled'  { 4 }; default { Write-Error "^""Error: Unknown startup mode specified: `"^""$defaultStartupMode`"^"". Revert cannot proceed."^""; return; }; }; if ($(Get-ItemProperty -Path "^""$registryKey"^"").Start -eq $defaultStartupRegValue) { Write-Host "^""`"^""$serviceName`"^"" is has already default startup mode: `"^""$defaultStartupMode`"^""."^""; } else { try { Set-ItemProperty $registryKey -Name Start -Value $defaultStartupRegValue -Force; Write-Host "^""Successfully restored `"^""$serviceName`"^"" with `"^""$defaultStartupMode`"^"" start, this may require restarting your computer."^""; } catch { Write-Error "^""Could not enable `"^""$serviceName`"^"": $_"^""; Exit 1; }; }; <# -- 4. Start if not running (must be enabled first) #>; if ($defaultStartupMode -eq 'Automatic' -or $defaultStartupMode -eq 'Boot' -or $defaultStartupMode -eq 'System') { if ($service.Status -ne [System.ServiceProcess.ServiceControllerStatus]::Running) { Write-Host "^""`"^""$serviceName`"^"" is not running, trying to start it."^""; try { Start-Service -Name $serviceName -ErrorAction Stop; Write-Host 'Service started successfully.'; } catch { Write-Warning "^""Failed to restart service. It will be started after reboot. Error: $($_.Exception.Message)"^""; }; } else { Write-Host "^""`"^""$serviceName`"^"" is already running, no need to start."^""; }; }"
:: Restore per-user "OneSyncSvc" service to its default configuration for individual user accounts
:: Restore the service `OneSyncSvc_*` 
PowerShell -ExecutionPolicy Unrestricted -Command "$serviceQuery = 'OneSyncSvc_*'; $defaultStartupMode = 'Automatic'; <# -- 1. Skip if service does not exist #>; $service = Get-Service -Name $serviceQuery -ErrorAction SilentlyContinue; if (!$service) { Write-Warning "^""Service query `"^""$serviceQuery`"^"" did not yield and results. Revert cannot proceed."^""; Exit 1; }; $serviceName = $service.Name; Write-Host "^""Restoring registry settings for service `"^""$serviceName`"^"" to default startup mode `"^""$defaultStartupMode`"^""."^""; <# -- 2. Skip if service info is not found in registry #>; $registryKey = "^""HKLM:\SYSTEM\CurrentControlSet\Services\$serviceName"^""; if (-Not (Test-Path $registryKey)) { Write-Warning "^""`"^""$registryKey`"^"" is not found in registry. Revert cannot proceed."^""; Exit 1; }; <# -- 3. Enable if not already enabled #>; $defaultStartupRegValue = switch ($defaultStartupMode) { 'Boot'      { 0 }; 'System'    { 1 }; 'Automatic' { 2 }; 'Manual'    { 3 }; 'Disabled'  { 4 }; default { Write-Error "^""Error: Unknown startup mode specified: `"^""$defaultStartupMode`"^"". Revert cannot proceed."^""; return; }; }; if ($(Get-ItemProperty -Path "^""$registryKey"^"").Start -eq $defaultStartupRegValue) { Write-Host "^""`"^""$serviceName`"^"" is has already default startup mode: `"^""$defaultStartupMode`"^""."^""; } else { try { Set-ItemProperty $registryKey -Name Start -Value $defaultStartupRegValue -Force; Write-Host "^""Successfully restored `"^""$serviceName`"^"" with `"^""$defaultStartupMode`"^"" start, this may require restarting your computer."^""; } catch { Write-Error "^""Could not enable `"^""$serviceName`"^"": $_"^""; Exit 1; }; }; <# -- 4. Start if not running (must be enabled first) #>; if ($defaultStartupMode -eq 'Automatic' -or $defaultStartupMode -eq 'Boot' -or $defaultStartupMode -eq 'System') { if ($service.Status -ne [System.ServiceProcess.ServiceControllerStatus]::Running) { Write-Host "^""`"^""$serviceName`"^"" is not running, trying to start it."^""; try { Start-Service -Name $serviceName -ErrorAction Stop; Write-Host 'Service started successfully.'; } catch { Write-Warning "^""Failed to restart service. It will be started after reboot. Error: $($_.Exception.Message)"^""; }; } else { Write-Host "^""`"^""$serviceName`"^"" is already running, no need to start."^""; }; }"

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