Scanners feed pages sideways, phones photograph documents upside down, and a landscape chart lands in a portrait report the wrong way up. Tilting your head — or hunting for the rotate button in every viewer, every time — is not a fix. This tool turns the pages inside the file itself, so the corrected PDF opens the right way up everywhere, for everyone, forever.
Rotation that is stored in the file
Every PDF page carries a rotation value written into the document. Viewers have their own temporary “rotate view” buttons, but those change only what you see on your screen, in that app, for that session — send the file on and it is sideways again. This tool uses pdf-lib (running locally in your browser) to rewrite the pages' stored rotation, adding your chosen turn to whatever rotation a page already has. The saved file therefore opens correctly in any reader, on any device, and stays that way. Page content is not re-rendered or recompressed: text stays selectable, images keep their quality, and the file size barely changes, because only the rotation instruction changes.
Choosing the angle
90° clockwise is the everyday fix for pages scanned or photographed sideways with the top of the page pointing left. 180° is for pages that are simply upside down — the text reads, but inverted. 270° clockwise (the same as 90° counter-clockwise) fixes sideways pages whose top points right. If you pick the wrong one, nothing is harmed: run the tool again on the rotated file with the opposite turn — 90° one way is undone by 270° the other way — or simply start again from your untouched original, which this tool never modifies.
Rotating only some pages
Mixed documents are the norm: nine upright pages and one sideways appendix. Leave the pages box blank to turn the whole document, or name exactly the pages to fix — singles like 5, ranges like 1-3, combinations like 1-3, 5, and open ranges like 8- for “page 8 to the end”. Only the named pages are turned; every other page keeps its existing rotation, and the order of pages never changes.
Private by design
Like every CalcViso file tool, this one runs entirely in your browser. The file you choose is read by this page, processed on your device, and offered back as a download — it is never uploaded to a server, never stored, and never seen by anyone else. Close the tab and it is gone from memory.
Worked example
Press the sample button to load a 3-page sample PDF created in your browser. Leave the pages box blank, keep 90° clockwise, and press Rotate PDF: every page in rotated.pdf is turned a quarter-turn — open it and the text runs sideways, proving the rotation is saved in the file. Then load the sample again, type “2” in the pages box and choose 180°: this time only the middle page flips, upside down, while pages 1 and 3 stay upright.
How to use this tool
- Drop your PDF onto the box (or create the sample).
- Leave the pages box blank to rotate everything, or type the pages to fix — e.g. 1-3, 5 or 8-.
- Choose the angle: 90° clockwise for sideways pages, 180° for upside-down pages, 270° for sideways the other way.
- Press Rotate PDF and download rotated.pdf.
- Open the download and flick through it — the fix is in the file, so it will look right in every reader.
Fixing a whole scanned batch
Scanner mistakes are usually consistent: if page 1 came out sideways because the stack went into the feeder rotated, the whole document did. Rotate the file once with the pages box left blank rather than page by page. The mixed case — a document assembled from several sources — is where ranges earn their keep: rotate each wrong group in its own pass, feeding each rotated output back in as the next input if the groups need different angles. And because rotations add up inside the file, a page that started at 90° and is turned by another 90° ends at 180°; if a document has been rotated several times before it reaches you, judge by how it looks, not by its history, and turn it by whatever amount makes it read upright.