Click the pages to remove and download the lighter PDF. Nothing is uploaded.
2, 5-7.The original file is not changed: you get a copy without the chosen pages.
The remaining pages are copied as they are: selectable text, full-resolution images, links. Quality does not change and the file gets lighter, especially if the removed pages contained images.
To do the opposite, keeping only certain pages, the "Split PDF" tool is more direct.
No. Everything happens in your browser: the file never leaves your device and nothing is stored.
If the PDF asks for a password to open, unlock it first with that password. A PDF that is only protected against editing can usually be processed.
Separate numbers with commas and use a hyphen for a range: "1, 4, 10-12" deletes pages 1, 4, 10, 11 and 12.