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List all large files within a SharePoint Site

Author: Veronique Lengelle

The following script will help you find every files in a specific SharePoint Online site that are over a certain size. It iterates through all libraries and identifies all files larger than the set threshold.

param (
    [Parameter(Mandatory = $true, HelpMessage = "URL of the target site", Position = 0)]
    [string]$SiteUrl,
    [Parameter(Mandatory = $true, HelpMessage = "Size in MB", Position = 1)]
    [int]$SizeInMB,
    [Parameter(HelpMessage = "Show progress messages", Position = 2)]
    [switch]$ShowProgress
)

$m365Status = m365 status --output text

if ($m365Status -eq "Logged Out") {
  # Connection to Microsoft 365
  m365 login
}

#Declare variables
$site = $SiteUrl
$results = @()
$allLibs = m365 spo list list --webUrl $site --query "[?BaseTemplate == ``101``]" -o json | ConvertFrom-Json

foreach ($lib in $allLibs) {
    # Counters
    $i++
    if ($ShowProgress) { Write-Host "Processing '$($lib.Title)' - ($i/$($allLibs.length))" }

    $allFiles = m365 spo file list --webUrl $site --folder $lib.Url --recursive -o json | ConvertFrom-Json

    foreach ($file in $allFiles) {
        if ($ShowProgress) { Write-Host "Processing file '$($file.ServerRelativeUrl)'" }

        #Cast as [long] in case some are above 1GB
        $fileSizeToNum = [long]($file.Length)

        if (($fileSizeToNum -ge ($SizeInMB * 1000000)) -and ($file.name -like "*.*")) {
            $results += [pscustomobject]@{
                libraryName      = $lib.Title
                fileName         = $file.Name
                filePath         = $file.ServerRelativeUrl
                normalSize       = $file.Length
                SizeInMB         = ($fileSizeToNum / 1MB).ToString("N")
                LastModifiedDate = [DateTime]$file.TimeLastModified
            }
        }
    }
}

$results
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