When to rotate a PDF
- Scanned documents — pages scanned the wrong way round.
- Landscape pages — tables or charts that appear sideways.
- Mixed documents — fix just the pages that need it.
How rotation works
Each PDF page has a rotation setting. The converter adds your chosen angle to the current rotation of each selected page and saves the file, leaving the page content untouched.
What is a PDF file?
PDF (Portable Document Format) was created by Adobe and is now an open ISO standard (ISO 32000). A PDF fixes the exact layout of every page — fonts, images and positions — so a document looks the same on every screen and printer. That makes it the standard for contracts, invoices, manuals, papers and forms.
Inside, a PDF stores each page as drawing instructions. Text written by a program is stored as real characters (a “text layer”) and can be selected and extracted. Scanned documents usually store only a picture of each page, so their text cannot be extracted without OCR.