Short version: open the free tool, drop your file, download the result. Nothing is uploaded.

Steps

Open the free WBS PDF Split tool and drop your PDF. It shows how many pages the file has.
Leave Extract pages into one PDF selected.
In Pages, type the pages you want to keep, skipping the ones to delete. To delete page 3 of a 10-page file, type 1-2, 4-10.
Press Split PDF. The new PDF, without the deleted pages, is saved to your downloads.

Quick recipes

To delete	Type in Pages (10-page example)
The first page (a cover)	`2-`
The last page	`1-9`
Pages 3 and 7	`1-2, 4-6, 8-`
Everything except pages 4 to 6	`4-6`

An open range like 8- means "page 8 to the end", so you don't need to know the exact page count.

Is anything lost?

The pages you keep are copied into the new file exactly as they are: no re-compression, and the text stays selectable and searchable. Your original PDF isn't changed, so you can always start again. Bookmarks and form fields from the original may not carry over.

Other ways

Mac: open the PDF in Preview, choose View → Thumbnails, select the pages, press Delete, then File → Save (or Export as PDF to keep the original).
Windows: printing to "Microsoft Print to PDF" with a page range works, but it re-prints the pages, which can make text unselectable and the file bigger.

Private and free

Everything runs in your browser; the PDF is never uploaded, there's no account and no watermark. Want each page as its own file instead? See how to save each page of a PDF separately. Pages the wrong way round? Rotate them.

More free guides

All tools: WBS Tools · All apps: Wood Between Studio apps