Blank, cover and signature pages
Most pages people remove fall into a few groups. A duplex scan of single-sided paper leaves a blank back after every sheet. A report starts with a cover sheet that a portal does not want. A contract ends with a signature page that goes to someone else. A document has a page of notes you wrote for yourself. In each case the rest of the file is fine, and you want it back without those pages.
ClipLime does not look for blank pages. It shows every page as a thumbnail, and you decide. If every second page is blank, Even pages marks them together, and if it is the odd pages, Odd pages does. Check the thumbnails first: a page that looks empty may hold a faint stamp, a page number or a scanner mark that someone expects to see.
If you only want the signature page, or only a few pages, the tool for extracting PDF pages saves just the pages you tick.
Before you share the new file
The pages you mark are not copied into the new file. Their text and pictures are left out when the file is written, they are not just hidden, and the original keeps them untouched. This holds even when a page you keep has a link or button that points at a removed page: that pointer is cut, and the removed page does not come along with it. That also means the original still contains everything, so attach the new file, not the old one.
Removing a page does not edit what is on the pages that stay. If page 12 says "see the figures on page 7" and you removed page 7, the sentence is still there. A printed table of contents still lists the old pages. A name, an account number or a comment on a remaining page stays on it. And whatever is stored inside the remaining pages is copied unchanged, such as the camera details inside a photo or the text of comments and highlights. Search the new file for what matters before you send it. Two traces can stay. A font that several pages share is copied whole, so if the font in the original also holds letters that only a removed page used, those letters are still in the font file; it is the list of letters the font can draw, never the words or their order. And a layer that is switched off but sits on a page you keep is still in the file, just not shown.
The title, author and other document information of the original are not copied, and the new file lists ClipLime as its producer. The private data that some editing programs keep inside a page, so that they can reopen it for editing, is left out. Layers keep the setting they had: a layer that was hidden stays hidden, and a layer that only a removed page used is not in the new file. Some PDF programs list every image of a document in one shared place. ClipLime copies only the pictures, fonts and patterns the remaining pages draw, including the ones used inside the drawings those pages contain, which means a picture that only a removed page used stays out. If it cannot read a page's drawing instructions, it keeps the whole shared list for that page and the result card says so, so open the result and check the file size before you rely on it.
Page numbers, links and bookmarks afterwards
A viewer counts pages from the start of the file, so the new file has pages 1 to N whatever they were called before. Numbers printed in the footer are part of the page's drawing and do not change: the page that was 9 and is now 7 still says 9. The special page labels some PDFs use, such as roman numerals for a preface, are not carried over either, so a viewer shows plain 1 to N.
Bookmarks are not copied. Links that jump to another page of the document are dropped, including the ones whose target stayed, because ClipLime does not rewrite links to follow pages to their new places. Links to websites, highlights and comments stay on their pages. Form fields keep their look and their typed values, but the new file is no longer a form you can fill in.
If a document depends on its bookmarks or internal links, remove pages in a program that edits PDFs in place and keep them, or accept that the new file is a plain list of pages.