Rotate PDF Pages only turns a page in 90-degree steps, wrapping back to 0 after passing 270, so there is no option for a custom angle like 45 degrees.
Adobe's online rotation tool applies a rotate-clockwise or rotate-counterclockwise action with each click, then requires selecting Save to keep the change in the file. Rotate PDF pages - Acrobat - Adobe
Rotate PDF PagesRotate PDF by 45 Degrees
Upload the PDF file to the Rotate PDF Pages interface.
Select the clockwise rotation icon to apply a 90-degree turn.
Click the counterclockwise icon to reverse the rotation direction.
Working Within Quarter-Turn Constraints
Review the page orientation after each rotation step.
Download the file to check the final alignment.
Addressing Skewed Scan Limitations
Open a separate image editing application for custom angle adjustments.
Export the corrected image as a PDF file.
Continue with Rotate PDF Pages Without Uploading or Rotate PDF Pages Single Page Only.
Frequently Asked Questions about Rotate PDF by 45 Degrees: What to Expect
How do I rotate a page in this tool?
Click the rotate clockwise or counterclockwise icon in the toolbar.
Where do I find the rotation options?
Select the rotation icons located in the top toolbar area.
How do I save the rotated document?
Save the rotated file after applying the quarter-turn.
What should I do if the page is still skewed?
Use a dedicated image editor to apply a custom rotation angle.