PowerShell Script to update Company logos across all SharePoint Online Sites

We apply Company logos across all SharePoint Online Site Collections and subsites. When a new logo is designed, I receive requests to update them. The PowerShell script below simplifies this process.

While running this script, you will get a window prompt to login with your Global Admin/SharePoint Admin account. Enter credentials and proceed forward.

# --------------------------

# Configuration

# --------------------------

$clientId = "12a34567-f123-4567-890e-1cch23456789"

$SiteCollectionUrl = "https://yourtenant.sharepoint.com/sites/company"

$LogoUrl = "https://yourtenant.sharepoint.com/sites/BrandGuide/Images/Company_Logo.png"

# Connect to root once (to enumerate subsites)

Connect-PnPOnline -Url $SiteCollectionUrl -Interactive -ClientId $clientId

# Get root + all subsites (recursive)

$webs = Get-PnPSubWeb -Recurse -IncludeRootWeb

# ---- Count of all sites (webs) ----

$totalSites = $webs.Count

Write-Host "Total sites (root + all subsites) found: $totalSites" -ForegroundColor Cyan

# Detect if your Connect-PnPOnline supports -ReturnConnection

$hasReturnConnection = (Get-Command Connect-PnPOnline).Parameters.ContainsKey("ReturnConnection")

$success = 0

$failed  = 0

foreach ($w in $webs) {

    try {

        Write-Host "[$success/$totalSites] Updating logo for: $($w.Title) -> $($w.Url)" -ForegroundColor White

        if ($hasReturnConnection) {

            $conn = Connect-PnPOnline -Url $w.Url -Interactive -ClientId $clientId -ReturnConnection

            Set-PnPWeb -Connection $conn -SiteLogoUrl $LogoUrl   # Set-PnPWeb works on current web / via -Connection

        }

        else {

            Connect-PnPOnline -Url $w.Url -Interactive -ClientId $clientId

            Set-PnPWeb -SiteLogoUrl $LogoUrl                    #

        }

        $success++

        Write-Host "SUCCESS: $($w.Url)" -ForegroundColor Green

    }

    catch {

        $failed++

        Write-Host "FAILED: $($w.Url) | $($_.Exception.Message)" -ForegroundColor Red

    }

}

Write-Host "Logo update process complete." -ForegroundColor Cyan

Write-Host "Summary: Total=$totalSites | Success=$success | Failed=$failed" -ForegroundColor Yellow

The result shows as below.