You have a 30-page PDF but only need to send 25 of them. Maybe the last five pages are blank from double-sided scanning. Maybe the first page is a cover sheet that's not relevant. Maybe there are pages with information that shouldn't go to this particular person.
How to do it
Go to pdfmerger.io/remove-pages. Upload your PDF. The tool shows thumbnails of every page. Click the pages you want to remove — they'll be marked for deletion. Click "Remove Pages" and a new PDF is created without those pages. Download it.
Your original file is never touched. The download is a new document with the selected pages gone.
Removing blank pages from scanned documents
This is the most common use. When you scan double-sided pages, the back of the last page often comes through as a blank. Scroll through the thumbnails, click the blanks, and remove them. Takes about 30 seconds.
When to use split instead of remove
Use the remove tool when you want to delete scattered pages throughout a document (page 3, page 8, page 15 from a 20-page document).
Use the split tool when you want to keep a contiguous block (pages 4-18 out of 30). Specifying a range to keep is faster than clicking all the pages you don't want.
What happens to the page numbering?
The file's internal page order renumbers automatically — if you delete page 3, what was page 4 becomes the new page 3. But if the pages have printed page numbers in a footer (like "Page 4"), those numbers are part of the content and won't change. That's something to be aware of before you delete pages from a document with numbered footers.
Can you undo?
There's no undo button after you download — but you don't need one. The original file is always still on your device. Just re-upload it and start again if you removed the wrong pages.