Specify the maximum log file size (KB): registry value MaxSize (Application)ComputerHKLM\Software\Policies\Microsoft\Windows\EventLog\Application

Policy ID: Channel_LogMaxSize_1
Scope: Computer Configuration
Supported on: At least Windows Vista
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: Windows Components › Event Log Service › Application

Registry

MaxSize

REG_DWORDComputer

HKLM\Software\Policies\Microsoft\Windows\EventLog\Application Current key

Enabled value: Depends on the option value
Element: Maximum Log Size (KB)
Value type: REG_DWORD
Required: true
Minimum value: 1024
Maximum value: 2147483647

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\EventLog\Application]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"MaxSize"=dword:<enter value>

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKLM\Software\Policies\Microsoft\Windows\EventLog\Application" /v "MaxSize" /t REG_DWORD /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKLM:\Software\Policies\Microsoft\Windows\EventLog\Application' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\EventLog\Application' -Name 'MaxSize' -PropertyType DWord -Value '<enter value>' -Force | Out-Null