Scanners get it wrong all the time. Turn one page or the whole document a quarter at a time, see the result immediately, and save.
A turned page genuinely becomes landscape in the grid, so you can see it is right before you save.
Only the rotation flag changes and the page content is copied as it is, so the result stays sharp at any zoom or print size, and its text can still be selected and searched.
Turn a portrait page and its thumbnail genuinely becomes landscape, rather than staying a portrait box with sideways contents. You can see the document is right before you write it.
Most scans already carry a rotation of their own. A quarter turn here is added to whatever the page had, which is why a scan that arrived sideways ends up where you expect rather than somewhere arbitrary.
Click one page, SHIFT+click a run, or use All Pages, which is what a whole sideways scan usually needs. Every page also has its own turn buttons in the corner.
One button undoes every turn made here and puts the document back as it arrived, without reopening the file.
Thumbnails are drawn only as they scroll into view, and the cache holding them is capped, so a long scan does not sit on hundreds of megabytes of pictures.
Only the rotation flag changes. Page content is copied across untouched, so nothing loses quality and a searchable PDF stays searchable.
Most free online PDF tools send your file to somebody else's computer, then ask you to trust that it really was deleted afterwards. Vuiso does not work that way. Everything happens inside your own device, exactly like opening a file in a program installed on your computer.
The easiest way to check: switch off your Wi‑Fi or unplug your internet, then use it as usual. Everything still works. A tool that quietly sends your file to someone else's server could not do that. As an extra safeguard, the page is locked down from the start, so your own browser blocks anything that tries to send data out.
Turning acts on the pages you have selected, or on all of them with the All Pages buttons.
Version 1.50.9 MBBest in Chrome or EdgeWindows, macOS, Linux
Launch without downloading DownloadOne file at a time. To combine several use Vuiso Merge PDF, and to drop pages use Vuiso Split & Remove PDF. Only the rotation flag is changed; page content is copied across untouched.