Use a dash for a range and commas between them. Page 1 is the first page of the file.
After it runs you are told exactly which pages were removed and how many are left, so you can check the count against what you expected. Your original file on your phone is untouched — a new file is created with "-cleaned" added to the name.
Page numbers here are counted from the start of the file. They are not the numbers printed on the paper. A scan that begins with a cover sheet will have its printed "page 1" as file page 2.
Two cases come up again and again. The first is scanning: phone scanners often catch a blank back side, so a ten-page contract arrives as fifteen pages, half of them empty. The second is privacy — an office asks for the pay slip pages of a document, and the rest is nobody's business. Sending only the pages that were asked for is simply good practice.
Scans pick up blank pages, duplicate sheets and cover pages nobody needs. Removing them makes a document shorter, lighter and easier to read. Type the pages to drop and everything else is kept in its original order and quality.
For sorting and keeping the finished documents:
Als Amazon-Partner verdiene ich an qualifizierten Verkäufen.Your original file is untouched, so simply start again.
Does the quality change?No. The remaining pages are copied exactly.
Is anything uploaded?No, everything happens on your device.