Tips
For website thumbnails, 1.5x at JPG is usually enough. For print or detailed reading, use 3x or higher with PNG to keep text crisp.
PDF to Image
Extract every page of a PDF as a high-resolution PNG or JPG image.
Extract every page of a PDF as a high-resolution PNG or JPG image.
Higher = larger, sharper images.
For website thumbnails, 1.5x at JPG is usually enough. For print or detailed reading, use 3x or higher with PNG to keep text crisp.