The counterpart of Extract pages. Here you say what to throw away instead of what to keep, which is handier when there are only a few pages to remove: the cover, a blank page the scanner slipped in, the attachment that shouldn't circulate.
The syntax is the same: single numbers separated by commas and ranges with a hyphen, for example 2, 5-6. The rest of the document stays as it was, in its original order and with the same quality.
If you try to delete every page, the tool stops and tells you so, instead of producing an empty file.