Use the Drupal module PDF to ImageField to generate images from PDF Files

If you use a filefield to upload PDFs you might want to display a preview thumbnail or to generate a gallery of images from the document. If so, the Drupal module PDF to ImageField is the solution you are looking for. he PDF To ImageField module provides automatic conversion of uploaded PDF files to images. The module is implemented as an additional widget for
File Field where PDFs are uploaded to. It places generated images into a Image Field on the same content type.

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