SharePoint Online: How to Change Site Logo using PowerShell?

#Add PowerShell Module for SharePoint Online
Import-Module Microsoft.Online.SharePoint.Powershell -DisableNameChecking

##Configuration variables
$SiteUrl = "https://crescent.sharepoint.com/"
$LogoURL="/SiteAssets/Logo.png" #Existing file

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

    #Setup the context
    $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteUrl)
    $Ctx.Credentials = $Credentials
    $Web = $Ctx.Web

    #Change Logo
    $Web.SiteLogoUrl = $LogoURL
    $Web.Update()
    $Ctx.ExecuteQuery()

    Write-host "Logo Updated Successfully!" -ForegroundColor Green
}
Catch {
    write-host -f Red "Error updating Logo!" $_.Exception.Message
} 

#Add PowerShell Module for SharePoint Online
Import-Module Microsoft.Online.SharePoint.Powershell -DisableNameChecking

##Configuration variables
$SiteUrl = "https://crescent.sharepoint.com/Sites/Sales"
$LogoURL="/SiteAssets/Logo.png"

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

    #Setup the context
    $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteUrl)
    $Ctx.Credentials = $Credentials

    #Get the Root web
    $Web = $Ctx.Web
    $Ctx.Load($Web)
    $Ctx.ExecuteQuery()

    #Function to change Logo for the given web
    Function Update-Logo($Web)
    {
        #Update Logo
        $Web.SiteLogoUrl = $LogoURL
        $Web.Update()
        $Ctx.ExecuteQuery()
        Write-host "Updated Logo for Web:" $Web.URL

        #Process each subsite in the site
        $Subsites = $Web.Webs
        $Ctx.Load($Subsites)
        $Ctx.ExecuteQuery()        
        Foreach ($SubSite in $Subsites)
        {
            #Call the function Recursively
            Update-Logo($Subsite)
        }
    }
    
    #Call the function to change the logo of the web
    Update-Logo($Web)
}
Catch {
    write-host -f Red "Error updating Logo!" $_.Exception.Message
}

#Function to set site Logo
Function Set-PnPSiteLogo
{
[cmdletbinding()]

    param(
    [parameter(Mandatory = $true, ValueFromPipeline = $false)]$Web,
    [parameter(Mandatory = $true, ValueFromPipeline = $false)][String] $LogoFilePath
    )
  
    Try {
        Write-host "Updating Logo on Site '$($Web.URL)'"

        #Ensure "Site Assets" library in the site
        $SiteAssets = Get-PnPList -Web $Web -Identity "Site Assets" -ErrorAction SilentlyContinue 
        If($SiteAssets -eq $Null)
        {
            New-PnPList -Web $Web -Title "Site Assets" -Template DocumentLibrary -Url "SiteAssets" -ErrorAction SilentlyContinue | Out-Null
        }

        #Upload Logo File to 'Site Assets' library of the current web
        Add-PnPFile -Web $Web -Path $LogoFilePath -Folder "SiteAssets" | Out-Null
 
        #Get File Name from Logo File's Full Path
        $LogoFileName = Split-Path $LogoFilePath -leaf

        #Set Site Logo
        Set-PnpWeb -Web $Web -SiteLogoUrl "$($Web.ServerRelativeUrl)/SiteAssets/$($LogoFileName)"
 
        #Get All Subwebs
        $SubWebs = Get-PnPSubWebs -web $Web
        Foreach ($web in $SubWebs)
        {
            #Call the function recursively
            Set-PnPSiteLogo -Web $Web -LogoFilePath $LogoFilePath
        }
    }
    catch {
        write-host "Error: $($_.Exception.Message)" -foregroundcolor Red
    }
}
#Parameters
$SiteURL = "https://crescent.sharepoint.com/sites/Marketing"
$LogoPath = "C:\Temp\Logo.jpg"

#Connect to Site
Connect-PnPOnline -Url $SiteURL -UseWebLogin
$Web = Get-PnPWeb

#Call the function to change site logo
Set-PnPSiteLogo -Web $Web -LogoFilePath $LogoPath
    

$SiteURL = "https://crescent.sharepoint.com/sites/Purchase"
$LogoPath = "C:\Temp\Logo.jpg"

#Connect to Site
Connect-PnPOnline -Url $SiteURL -UseWebLogin

#Set Site Logo
Set-PnPSite -LogoFilePath $LogoPath

#Parameters
$Domain =  "Crescent" #Your Domain Name in SharePoint Online. E.g. https://Crescent.SharePoint.com
$LogoFilePath = "C:\Temp\SPLogo.jpg"
$Cred = Get-Credential

#Frame Tenant URL and Tenant Admin URL
$TenantURL = "https://$Domain.SharePoint.com"
$TenantAdminURL = "https://$Domain-Admin.SharePoint.com"

#Function to set site Logo
Function Set-PnPSiteLogo
{
    [cmdletbinding()]

   param(
    [parameter(Mandatory = $true, ValueFromPipeline = $True)]$Web,
    [parameter(Mandatory = $true, ValueFromPipeline = $False)][String] $LogoFilePath
    )
  
    Try {
        #Ensure "Site Assets" library in the site
        $SiteAssets = Get-PnPList -Web $Web -Identity "Site Assets" -ErrorAction SilentlyContinue 
        If($SiteAssets -eq $Null)
        {
            New-PnPList -Web $Web -Title "Site Assets" -Template DocumentLibrary -Url "SiteAssets" -ErrorAction SilentlyContinue | Out-Null
        }

        #Upload Logo File to 'Site Assets' library of the current web
        Add-PnPFile -Web $Web -Path $LogoFilePath -Folder "SiteAssets" | Out-Null
 
        #Get File Name from Logo File's Full Path
        $LogoFileName = Split-Path $LogoFilePath -leaf

        #Set Site Logo
        Set-PnpWeb -Web $Web -SiteLogoUrl "$($Web.ServerRelativeUrl)/SiteAssets/$($LogoFileName)"
        Write-host "`n`tUpdated Logo on Web '$($Web.URL)'" -f Green

        #Get All Subwebs
        $SubWebs = Get-PnPSubWebs -web $Web
        Foreach ($web in $SubWebs)
        {
            #Call the function recursively
            Set-PnPSiteLogo -Web $Web -LogoFilePath $LogoFilePath
        }
    }
    catch {
        write-host "Error: $($_.Exception.Message)" -foregroundcolor Red
    }
}

#Connect to Admin Center
Connect-PnPOnline -Url $TenantAdminURL -Credentials $Cred
    
#Get All Site collections - Exclude BOT, Video Portals and MySites
$Sites = Get-PnPTenantSite -Filter "Url -like $TenantURL -and Url -notlike '-my.sharepoint.com/' -and Url -notlike '/portals/'"
   
#Iterate through all site collections
$Sites | ForEach-Object {
    #Connect to each site collection
    $SiteConn = Connect-PnPOnline -Url $_.URL -Credentials $Cred -ReturnConnection
    
    Write-host "Processing Site Collection:"$_.URL -f Yellow -NoNewline
    #Check if its a Group site
    If($_.Template -like 'GROUP*')
    {
        Set-PnPSite -LogoFilePath $LogoFilePath
        Write-host "`n`tUpdated Logo on Group Site!" -f Green
    }
    Else
    {   
        #Call the Function for site & all Subwebs
        Get-PnPWeb -Connection $SiteConn | Set-PnPSiteLogo -LogoFilePath $LogoFilePath
    }
    Disconnect-PnPOnline -Connection $SiteConn
}