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Fix · a common PDF problem

PDF pages sideways or upside down?

Short answer. Each PDF page stores a rotation value. Fix it by rotating the affected pages and saving the file, not only the view, so every viewer and portal shows them upright.
Page checkRead in this tab, never run
Drop a PDF anywhere on this pageThe instant X-ray reads the raw bytes; the full inspector then parses every object in a Web Worker. Nothing is uploaded or executed.
What you’ll see
  • Every page’s size and saved rotation
  • Which pages have a text layer and which are only images
  • The fix for each: rotate, organize or OCR
Requests since you added a file: 0Counted by this page · check it without trusting us

Causes and fixes

  1. 1
    Scanner fed the page in another directionThe image itself is sideways; set the page rotation to turn it upright.
    Rotate and save
  2. 2
    Rotated only in the viewerView → Rotate in most viewers isn’t saved into the file.
    Save the rotation
  3. 3
    Mixed page order and orientationSeveral pages need turning and moving.
    Organize pages

What is going on

Every page in a PDF has a rotation value of 0, 90, 180 or 270 degrees that tells viewers how to turn it for display. Scanners and phone apps sometimes save a page with the image sideways and rotation 0, or with a rotation that only makes sense on the device that made it. The page check above lists each page’s size and saved rotation.

Rotating in a viewer usually changes only your view. The next person, or the upload portal, sees the original orientation. Rotating here writes the new value into each page, without re-rendering or re-compressing anything, so the file stays the same size and text stays selectable.

If a scan is slightly crooked rather than sideways, rotation won’t help; that needs straightening, which the scanner tool does for new captures.

Checked 2026-10-05. The diagnostic above runs in this tab; your file is not uploaded.