Look for a fast duplicate file finder for Windows 11/10

You can use  PowerShell and Get-FileHash command to find duplicate files in Windows 11, Windows 10 and Windows 7. There is no need to install extract duplicate file finder in Windows or this task.

Step 1: Open Windows Terminal or PowerShell as an administrator.

Step 2: Run a one-liner that walks a folder tree, calculates a SHA-256 hash for every file, groups identical hashes, and prints anything with more than one match:

Get-ChildItem "D:\Data" -Recurse -File |
  Get-FileHash -Algorithm SHA256 |
  Group-Object Hash | Where-Object { $_.Count -gt 1 } |
  ForEach-Object {
    "`n### Duplicate set (`$($_.Count) files, hash=$($_.Name))"
    $_.Group | Select-Object Path, Length
  }

Redirect the output to a text file if you want a report: ... | Out-File Duplicates.txt.

Because the check is content-based, it doesn't matter if file names differ. When you're comfortable the list is correct, you can pipe the duplicates to Remove-Item instead of printing them without 3rd-party duplicate file finder software.