The cmdlet queries the given source folder including sub-folders to find *.docx and *.doc files, converts all found files and saves them as pdf in the Destination folder. After completition, the Destination folder with the newly created PDF files will be opened with Windows Explorer.

Convert Word To PDF.ps1

function Convert-WordToPDF 
{
 
    <# 
      
    .SYNOPSIS 
     
    ConvertTo-PDF converts Microsoft Word documents to PDF files. 
      
    .DESCRIPTION 
     
    The cmdlet queries the given source folder including sub-folders to find *.docx and *.doc files, 
    converts all found files and saves them as pdf in the Destination folder. After completition, the Destination
    folder with the newly created PDF files will be opened with Windows Explorer.
      
    .PARAMETER SourceFolder
      
    Mandatory. Enter the source folder of your Microsoft Word documents.
      
    .PARAMETER DestinationFolder
     
    Optional. Enter the Destination folder to save the created PDF documents. If you omit this parameter, pdf files will
    be saved in the Source Folder.
     
    .EXAMPLE 
     
    ConvertWordTo-PDF -SourceFolder C:\Temp -DestinationFolder C:\Temp1
    ConvertWordTo-PDF -SourceFolder C:\temp
    
    #>
     
    [CmdletBinding()]
     
    param
    (
      
    [Parameter (Mandatory=$true,Position=0)]
    [String]
    $SourceFolder,
      
    [Parameter (Position=1)]
    [String]
    $DestinationFolder = $SourceFolder
     
    )
     
        $i = 0
     
        $word = New-Object -ComObject word.application 
        $FormatPDF = 17
        $word.visible = $false
        $types = '*.docx','*.doc'
     
        If ((Test-Path $SourceFolder) -eq $false) {
         
        throw "Error. Source Folder $SourceFolder not found." } 
     
        If ((Test-Path $DestinationFolder) -eq $false) {
         
        throw "Error. Destination Folder $DestinationFolder not found." } 
         
        $files = Get-ChildItem -Path $SourceFolder -Include $Types -Recurse -ErrorAction Stop
        ''
        Write-Warning "Converting Files to PDF ..."
        ''
         
        foreach ($f in $files) {
     
            $path = $DestinationFolder + '\' + $f.Name.Substring(0,($f.Name.LastIndexOf('.')))
            $doc = $word.documents.open($f.FullName) 
            $doc.saveas($path,$FormatPDF) 
            $doc.close()
            Write-Output "$($f.Name)"
            $i++
     
        }
        ''
        Write-Output "$i file(s) converted."
        Start-Sleep -Seconds 2 
        Invoke-Item $DestinationFolder
        $word.Quit()
         
         
    }

# calling function
Convert-WordToPDF -SourceFolder C:\temp