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Right-click the image.
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Select Rotate and choose an option:
 Rotate Right 90°  Rotate Left 90°   Flip Horizontal   Flip Vertical
To crop before rotating, see Crop an image.
Note: File attachments can't be rotated. For a workaround, see Rotate a file.
Rotating an image isn't currently possible in OneNote for the web. You can, however, rotate an image in the OneNote desktop app.
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To open the desktop app, at the top of the ribbon, select Editing > Open in Desktop App.
Don't have the app? Get it for free in the Microsoft Store.
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Control+click the image.
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Select Rotate and choose an option:
• Rotate Right 90° • Rotate Left 90° • Flip Horizontal • Flip Vertical
To crop before rotating, see Crop an image.
Note: File attachments can't be rotated. For a workaround, see Rotate a file.