Reversing a PDF flips the entire page order so the last page becomes the first. This is surprisingly useful for documents scanned back-to-front, or for certain printing and binding workflows that expect reversed order.
ColaPDF reverses the sequence instantly and entirely in your browser, producing a new file while leaving the original untouched.
The last page becomes page 1, and page 1 becomes the last. All pages are kept, just in reversed order.
No. Everything runs in your browser.
Yes — reversing is one of the fastest operations, taking under a second for most PDFs.