Rotate PDF

Rotating a page in a viewer and rotating it in the file are different things. A viewer rotation is a display preference — open the same PDF elsewhere and the page is sideways again. This tool writes the rotation into the page dictionary itself, so every reader, every print dialog and every other tool sees the corrected orientation permanently.

All pages start selected, which covers the common case of a document that was scanned or exported sideways as a whole. Click pages to deselect them when only a few need turning — a landscape table on page 7 of an otherwise upright report is the classic example. Rotation applies in 90-degree steps because that is what the PDF format stores; 45-degree rotation is not a thing a page can carry.

Rotation is stored as a single number per page, so nothing is re-rendered or re-compressed. A 300-page document rotated and saved keeps every image and every font byte identical — only the orientation metadata changed. The preview turns instantly while you work because the display uses the same number that will be written.

Rotation here is metadata, the cheapest operation a PDF supports: the engine writes one number per page and hands back a file. That is why even large documents rotate and save in a blink, and why the output is byte-conservative — the images, fonts and text inside are untouched. The whole loop, read to download, runs in the worker on this machine with outbound connections blocked by policy.

Two cautions come with the simplicity. Sideways-but-straight is fixable here; skewed is not — a page photographed at an angle needs deskew, which lives in the Android app's scanner. And rotated pages stay rotated: the number is written permanently, so verify the preview grid shows every page upright before saving, since un-rotating means running the tool again in the other direction.

The landscape-table document is the everyday case: forty upright pages and one wide table photographed sideways at page 27. Every page arrives selected; click all but page 27 to deselect, turn the one page right, save. The forty upright pages are rewritten with identical orientation numbers — nothing visually changes for them — and page 27 now opens correctly in every reader, prints correctly, and stays correct in the Android app that reads the file next week. The result card confirms how many pages were written, so a forty-one page fix cannot quietly become forty. If a second page turns out sideways later, the same run takes seconds — the original is still on disk, untouched by the first fix.