A page scanned sideways looks fine in a viewer where you can rotate the view, and wrong everywhere else — printed, attached to an email, or opened by whoever receives it. Rotating in a viewer usually does not save; this tool writes the rotation into the file so it stays.
Your file never leaves your device. The PDF is read by your browser and edited in memory by a JavaScript library served from this site. Nothing is uploaded, nothing is stored, and closing the tab discards everything. You can verify this by opening your browser's network tab while you use the tool.
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Result
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What the Rotate PDF does
Every PDF page carries a rotation property that readers apply when displaying it. This tool changes that property, which is why the operation is instant and completely lossless — no pixels are moved and nothing is re-rendered.
Rotation is added to whatever the page already had. A page already rotated 90° that you rotate another 90° ends up at 180°, exactly as you would expect.
How to use this tool
- Select your PDF and wait for the thumbnails, which show the current orientation of each page.
- Tick the pages that need rotating. Leave everything unticked to rotate the whole document.
- Choose 90° clockwise, 180°, or 90° anticlockwise.
- Press Rotate pages and download the corrected file.
How rotation is stored
Each PDF page has a /Rotate entry: 0, 90, 180 or 270 degrees.
Readers apply it when displaying the page.
New rotation = (existing rotation + chosen angle) mod 360
Because only this value changes:
• no pixels are moved
• text stays selectable and in the same order
• file size is unchanged
• the operation is instant even on large documents
Worked example
Example: a mixed-orientation scan
| Pages 1–5 | upright, left alone |
| Pages 6–7 | sideways, ticked |
| Rotation applied | 90° anticlockwise on pages 6–7 only |
| Result | all seven pages upright |
Mixed orientations are typical when a multi-page document is scanned in one pass with some sheets fed the wrong way.
What your result means
Rotation is permanent in the sense that it is saved into the file — every reader will now display the page the right way up, and it will print correctly.
File size does not change, because only a single property per page is modified.
If a page still looks wrong after rotating, it was probably at 180° rather than 90° — rotate it again by 180°.
Important considerations
- Rotating the view in a PDF reader is not the same as rotating the page. Most readers do not save the change, which is why the file still looks wrong to the next person who opens it.
- Text extraction and OCR work better on correctly oriented pages, so rotate before running either.
- A page that is upside down needs 180°, not two 90° rotations — though the result is identical.
- Rotation does not change the page dimensions recorded in the file. A rotated A4 portrait page is still A4, displayed landscape.
- If a scan is skewed by a few degrees rather than a clean 90°, rotation cannot fix it — that needs deskewing, which this tool does not do.
Limitations of this tool
- Everything runs in your device's memory, so very large documents — several hundred high-resolution scanned pages — can be slow or exhaust available memory. The tool reports a clear error rather than crashing silently.
- Password-protected PDFs cannot be opened. Remove the password in a PDF reader first and save an unprotected copy.
- Damaged or partially downloaded PDFs cannot be parsed. If a file fails, try re-downloading it from the original source.
- Only 90-degree increments are possible, because that is what the PDF format stores. Arbitrary angles would require re-rendering every page as an image and losing the text.
- Skew correction and automatic orientation detection are not included.
Frequently asked questions
Why does my PDF go back to sideways after I rotate it in a reader?
Because most readers rotate only the view, not the file. This tool writes the rotation into the document, so it persists everywhere — including when printed or emailed.
Does rotating reduce quality?
No. Only a rotation property is changed; no pixels are touched and the file size is unchanged. It is completely lossless.
Can I rotate just one page?
Yes. Tick that page in the thumbnail preview and only it will be rotated. With nothing ticked, every page is rotated.
Can I rotate by 45 degrees?
No. PDF stores rotation only in 90-degree steps. An arbitrary angle would mean re-rendering the page as an image, which would lose the selectable text.