Convert PDF base 64 to image base64

.cs

static List<string> ConvertPdfToImages(string documento)
{
    var images = Conversion.ToImages(documento, null, 150);

    var result = new List<string>();
    foreach (var image in images)
    {
        SKImage imagen = SKImage.FromPixels(image.PeekPixels());
        SKData encoded = imagen.Encode();
        Stream stream = encoded.AsStream();
        stream.Position = 0;
        using MemoryStream ms = new MemoryStream();
        stream.CopyTo(ms);

        var base64 = ms.ToArray();
        result.Add(Convert.ToBase64String(base64));
    }

    return result;
}

Using library PDFtoImage https://www.nuget.org/packages/PDFtoImage