SharePoint Online: Find All Large Files using PowerShell

Requirement: Find all large files in SharePoint Online site collection.

How to Find Large Files in SharePoint Online?

To find large files in SharePoint Online, you can use “Storage Metrics” page.

  • Navigate to your SharePoint Online site collection >> Click on Settings Gear >> Site Settings
  • On the Site Settings page, click on the “Storage Metrics” link under “Site Collection Administration” (
  • The Storage Metrics page gives you the current Storage consumption of the site. You can navigate to each site/folder object to get the storage stats of the particular object.
    sharepoint online find large files

You can also include the OOTB “File Size” column in your document library views to get the size of individual files! Explorer view also helps!!

SharePoint Online: PowerShell to Get All Large Files in a Site Collection

Getting large files by navigating into each folder from the above Storage metrics page is cumbersome, So let’s use PowerShell to fetch all larger files in a SharePoint Online site collection.

#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
#Function to find large files of the web
Function Find-SPOLargeFiles([String]$SiteURL, [Microsoft.SharePoint.Client.Folder]$Folder)
    Write-host -f Yellow "Processing Folder: $($SiteCollURL)$($Folder.ServerRelativeURL)"
    Try {
            $LargeFileResult = @()
            #Get all Files from the folder
            $FilesColl = $Folder.Files
            #Iterate through each file and check the size
            Foreach($File in $FilesColl)
                If($File.length -gt 50MB)
                    $FileURL= $SiteCollURL+$File.ServerRelativeURL
                    $Result = New-Object PSObject
                    $Result | Add-Member NoteProperty FileName($File.Name)
                    $Result | Add-Member NoteProperty FileURL($FileURL)
                    $Result | Add-Member NoteProperty Size-MB([math]::Round($File.Length/1MB))
                    #Add the result to an Array
                    $LargeFileResult += $Result
                    Write-host -f Green "Found a File '$($File.Name)' with Size $([math]::Round($File.Length/1MB))MB"

                    #Export the result to CSV file
                    $LargeFileResult | Export-CSV $ReportOutput -NoTypeInformation -Append
            #Process all Sub Folders
            $SubFolders = $Folder.Folders
            Foreach($Folder in $SubFolders)
                #Exclude "Forms" and Hidden folders
                If( ($Folder.Name -ne "Forms") -and (-Not($Folder.Name.StartsWith("_"))))
                    #Call the function recursively
                    Find-SPOLargeFiles -SiteURL $SiteURL -Folder $Folder
    Catch {
        write-host -f Red "Error Finding Large Files!" $_.Exception.Message

#Function to Generate Report on Large Files in a SharePoint Online Site Collection
Function Get-SPOLargeFilesRpt($SiteURL)
    #Setup the context
    $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
    $Ctx.Credentials = $Credentials
    #Get the web from given URL and its subsites
    $Web = $Ctx.web

    #Call the function to get large files of the web
    Find-SPOLargeFiles -SiteURL $SiteURL -Folder $Web.RootFolder

    #Iterate through each subsite of the current web and call the function recursively
    foreach ($Subweb in $web.Webs)
        #Call the function recursively to process all subsites underneath the current web

#Config Parameters

#Setup Credentials to connect
$Cred= Get-Credential
$Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)

#Delete the Output Report, if exists
if (Test-Path $ReportOutput) { Remove-Item $ReportOutput }

#Call the function 
Get-SPOLargeFilesRpt $SiteCollURL

This script gets you the list of all files which are larger than 50MB into a CSV file with “File Name”, “File URL” and “Size in MB” columns!

PnP PowerShell: Find Large Files in SharePoint Online Site

Let’s find large files >100 MB in a given SharePoint Online site with PnP PowerShell

#Config Variables
$SiteURL = ""
$CSVFilePath = "C:\Temp\LargeFiles.csv"

#Connect to PnP Online
Connect-PnPOnline -Url $SiteURL -Credentials (Get-Credential)

#Get all document libraries
$FileData = @()
$DocumentLibraries = Get-PnPList | Where-Object {$_.BaseType -eq "DocumentLibrary" -and $_.Hidden -eq $False}

#Iterate through document libraries
ForEach ($List in $DocumentLibraries)
    Write-host "Processing Library:"$List.Title -f Yellow
    #Get All Files of the library with size > 100MB 
    $Files = Get-PnPListItem -List $List -PageSize 500 | Where {($_.FieldValues.FileLeafRef -like "*.*") -and ($_.FieldValues.SMTotalFileStreamSize/1MB -gt 100)}
    #Collect data from each files
    ForEach ($File in $Files) 
        $FileData += [PSCustomObject][ordered]@{
            Library         = $List.Title
            FileName        = $File.FieldValues.FileLeafRef
            URL              = $File.FieldValues.FileRef
            Size            = [math]::Round(($File.FieldValues.SMTotalFileStreamSize/1MB),2)
#Export Files data to CSV File
$FileData | Sort-object Size -Descending
$FileData | Export-Csv -Path $CSVFilePath -NoTypeInformation

Salaudeen Rajack

Salaudeen Rajack is a SharePoint Architect with Two decades of SharePoint Experience. He loves sharing his knowledge and experiences with the SharePoint community, through his real-world articles!

2 thoughts on “SharePoint Online: Find All Large Files using PowerShell

  • I am getting an error, when I try to use Microsoft.SharePoint.Client.Folder constructor:

    $Folder = New-Object -TypeName Microsoft.SharePoint.Client.Folder
    A constructor was not found. Cannot find an appropriate constructor for type Microsoft.SharePoint.Client.Folder

    I am using SharePoint Online Client Components version 16 and I load the same libraries as in the script. Here: I read that Folder constructor is inside Microsoft.SharePoint.Client.Portable.dll library, but that didn’t help and I am getting the same error. What do I miss ?

  • This was very useful, Thanks!!


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