Make a File Read-Only (and Back) with PowerShell

Toggle the IsReadOnly attribute on any file to lock it from edits or unlock it again.

WindowsFilesattributespowershellLow risk

Run `Set-ItemProperty -Path "C:\Docs\report.xlsx" -Name IsReadOnly -Value $true` to make a file read-only; use $false to unlock.

01Command

Command

$ Set-ItemProperty -Path "C:\Docs\report.xlsx" -Name IsReadOnly -Value $true  ::  $false to undo

02What it does

Every file in NTFS carries an IsReadOnly flag; when it's true, apps that honor the attribute refuse to save over the file. Set-ItemProperty flips it directly, and Get-ItemProperty shows the current state. This is ideal for protecting template or invoice files you keep overwriting by accident.

03Risk

RiskLow risk

RequirementsWindows PowerShell; write access to the file.

!Warning: Read-only is a soft lock — a program can still delete the file or a user can clear the attribute.

04Undo

Undo

$ Set-ItemProperty -Path "C:\Docs\report.xlsx" -Name IsReadOnly -Value $false

05Sources

Set-ItemProperty (Microsoft.PowerShell.Management)
Microsoft Learn · vendor-doc · 2026-09-17
Evidence: Documents using Set-ItemProperty with -Path, -Name and -Value to change item property values.
Set-ItemProperty — Set a property value
SS64 · technical · 2026-09-17
Evidence: Lists the IsReadOnly property of files as a value settable via Set-ItemProperty.

Last verified: 2026-09-19 · Category: Files & Folders

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