Rotation without re-encoding
A PDF page carries a rotation attribute — a number the reader applies when drawing the page. Changing it does not touch the page content at all: no pixels are re-encoded, no text is rewritten, nothing is compressed a second time. The file that comes out is the file that went in, with one instruction changed.
This matters because it means rotating is completely lossless. You can rotate a scan a dozen times and the hundredth save will be identical in quality to the first.
Why scans come out sideways
Scanners and phone cameras record an orientation flag rather than physically rotating the image. Different software honours that flag differently, which is why a page can look upright in one reader and sideways in another. Setting the rotation explicitly, as this tool does, removes the ambiguity — every reader will then agree.
Mixed orientations in one document
Documents assembled from several sources frequently contain a mix: portrait text pages with a landscape table or a photographed receipt among them. Select only the pages that need turning rather than rotating everything, otherwise you will fix one problem and create another.
Related tasks
- Need only some pages? Use the split tool to extract them first.
- Assembling several documents? The merge tool can reorder and rotate as it combines.
- Building a PDF from photographs? The images to PDF tool lets you rotate each image before it becomes a page.
Frequently asked questions
Does rotating a PDF reduce its quality?
No. Rotation changes an attribute the reader applies when drawing the page. The page content is never re-encoded, so the result is identical in quality to the original.
Can I rotate only some pages?
Yes. Click the pages you want to select them, then rotate. Documents that mix portrait and landscape pages usually need exactly this.
Why does my scan look upright in one program and sideways in another?
Scanners record an orientation flag rather than rotating the image itself, and programs honour that flag inconsistently. Setting the rotation explicitly makes every reader agree.
Is my PDF uploaded anywhere?
No. The file is read and rewritten inside your browser. Nothing is transmitted or stored.
Does the file size change?
Barely. Only a rotation value is altered, so the output is essentially the same size as the input.