Script to convert a PDF to a PNG using imagemagick and ghostscript

pdf2png.ps1

function Command-Exists {
    param($command)
    $oldPreference = $ErrorActionPreference
    $ErrorActionPreference = 'SilentlyContinue'
    $exists = Get-Command $command -ErrorAction SilentlyContinue
    $ErrorActionPreference = $oldPreference
    return $exists -ne $null
}

function Check-ImageMagick {
    if (-not (Command-Exists 'magick')) {
        Write-Host "❌ ImageMagick is not installed or not in PATH. Please install it from https://imagemagick.org/script/download.php"
        return $false
    }
    return $true
}

function Check-Ghostscript {
    if (-not (Command-Exists 'gswin64c')) {
        Write-Host "❌ Ghostscript 64-bit is not installed or not in PATH. Please install it from https://ghostscript.com/releases/gsdnld.html"
        return $false
    }
    return $true
}

function ConvertPDFtoPNG() {
    #Check for required software
    $imagemagickInstalled = Check-ImageMagick
    $ghostscriptInstalled = Check-Ghostscript
    
    # Exit if either dependency is missing
    if (-not $imagemagickInstalled -or -not $ghostscriptInstalled) { 
        Write-Host "`nPlease install the missing dependencies and restart Powershell." -ForegroundColor Red
        exit 1
    }

    # Change to the folder containing ImageMagick if not in PATH
    # $imageMagickPath = "C:\Program Files\ImageMagick-7.0.10-Q16-HDRI"  # Update to your install path
    # $env:Path += ";$imageMagickPath"

    # Set output folder (optional: uncomment to use a subfolder for PNGs)
    $outputFolder = "$PWD\ConvertedPNGs"
    if (!(Test-Path $outputFolder)) { New-Item -ItemType Directory -Path $outputFolder }

    # Loop through all PDFs in the current folder
    Get-ChildItem -Filter "*.pdf" | ForEach-Object {
        $pdfPath = $_.FullName
        $pdfName = $_.BaseName

        # Set output pattern for PNGs (one PNG per page)
        $outputPattern = "$outputFolder\$pdfName" + "_page_%d.png"

        # Run ImageMagick's convert command
        Write-Host "Processing: $pdfName.pdf..."
        magick convert -density 300 $pdfPath $outputPattern

        if ($?) {
            Write-Host "✅ Successfully converted $pdfPath.pdf to PNGs in $outputFolder"
        } else {
            Write-Host "❌ Failed to convert $pdfPath.pdf" -ForegroundColor Red
        }
    }
}


# Short alias function
function pdf2png {
    ConvertPDFtoPNG
}

function makepng {
    ConvertPDFtoPNG
}