Does rotating change quality?
No. Rotation is stored as a page attribute, not applied to pixels, so the original content is untouched.
Rotate a PDF that is sideways
Turn every page 90 degrees clockwise. The fix is written into the page, so nothing is re-rendered.
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Why rotation usually ruins the quality
A common failure: you rotate a scan, save it, and the text now looks slightly soft. That happens when a tool rasterises each page — renders it to an image at some DPI, rotates the pixels, and rebuilds a PDF from that image. You lose the text layer, and often sharpness with it.
PDFKit does not do that. A PDF page has a rotation attribute in its page dictionary. Changing that number is what a viewer uses to decide how to draw the page. Text stays text, images stay untouched, and the file size barely changes.
Rotation details
Enough to know exactly what you are getting.
| Detail | Behaviour | What it means |
|---|---|---|
| Direction | 90 degrees clockwise | The tool applies one rotation per run. Three runs equals one counter-clockwise turn. |
| Scope | Every page in every input | There is no per-page rotation. Drop only the pages that need turning. |
| Mechanism | Page dictionary, not pixels | No rasterisation. Text stays selectable and the original resolution is untouched. |
| Existing rotation | Added, not replaced | A page already at 90 degrees becomes 180. The tool respects what was already set. |
| File size | Essentially unchanged | The content stream is not rewritten, only the page attribute. |
| Annotations | Rotate with the page | Highlights and comments follow the page orientation. |
Five things people get wrong
Rotating a page that only looks sideways in one viewer
Check in a second viewer first. Some mobile previewers ignore the rotation attribute.
Rotating upside-down documents
Upside down needs 180 degrees, this tool does 90. Run it twice.
Assuming rotation fixes a photo shot at an angle
Rotation only handles multiples of 90. A skewed photo needs a deskew step, not a rotate.
Rotating an already-correct PDF by mistake
Run it three more times to return to zero, or redo from the original file.
Expecting the rotation to survive a rasterising step elsewhere
If another tool renders the PDF to an image it should honour page rotation, but verify before publishing.
Questions
Can I rotate only one page?
Not in one pass. Every page in every dropped file is rotated. Split the document first if only one page needs it.
Does it rotate counter-clockwise?
No, only clockwise. Three runs equals one counter-clockwise rotation.
Will the text still be selectable?
Yes. The rotation is metadata, so the text layer is intact.
Is my file uploaded?
No. Everything happens in the browser tab; no network requests after page load.
Can I rotate a password-protected PDF?
No. The document must be decryptable to change its page dictionaries.
Why does my scan look sideways in one app but fine in another?
Some viewers ignore the rotation attribute. The PDF is right; the viewer is wrong.
Does the output keep annotations?
Yes, they move with the page.
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