Pull the images embedded in a PDF out as separate files. This recovers the pictures as they were stored in the document, at their original resolution, rather than rendering the page and cropping - so an image placed small on the page still comes out at whatever resolution it was embedded with.
This pulls out pictures that were embedded in the document. PDF to Image renders whole pages into new image files. If you want the photograph from page four, use this; if you want a picture of page four, use that.
A single visible picture is sometimes stored as several tiles, and background elements, logos and rules count as images too. Documents produced by certain design tools are especially prone to this.
That is the resolution actually stored in the file. If the document was compressed at some point, the original quality is gone and cannot be recovered by extracting.
Files are uploaded over an encrypted connection and processed on CoonTool's own server, not in your browser. The working copy is deleted automatically once the job is done, and in any case within 24 hours. Nothing is stored permanently and no account is required.