You open the PDF. The content is landscape but the page is portrait, so half the content is missing off the side. Or every page is rotated 90 degrees and you're reading sideways.
The orientation metadata in the file doesn't match the content. Quick fix.
What's actually going wrong
PDFs store page dimensions and a rotation flag separately. A landscape-content page exported with portrait dimensions and zero rotation displays its content crammed sideways into a portrait frame. A correctly-sized page with the wrong rotation flag displays sideways.
Most orientation problems come from scanners that don't auto-detect feed direction, or source apps that exported page metadata incorrectly.
The quick fix
Rotate the pages permanently. Drop the PDF into rotate PDF pages, select the affected pages, rotate to the right orientation, save. The new file displays correctly in every viewer because the metadata now matches.
If only specific pages have the issue, use the page selector. The rest of the document stays untouched.
If that didn't work
If the page dimensions are wrong (landscape content on portrait page), rotation alone won't help. You need to resize the page. Convert to Word, set the page to landscape in Word, then convert back to PDF. The new file has correct dimensions.
Alternatively, convert to JPG (which produces images at their displayed orientation), rotate the JPGs if needed, then convert image to PDF with the right page size.
Prevent it next time
Check page orientation in your source app before exporting. For scans, use auto-rotate. When exporting landscape pages, confirm the export preset uses landscape page size. And test the first page of any new export workflow on a different device — if it displays right on your machine but sideways on a phone, the file has a metadata issue.
FAQ
Why does my PDF look right on screen but landscape when printed?
The page dimensions are landscape but rotation makes it display as portrait on screen. Printers ignore rotation metadata and use raw dimensions. Rotate the pages permanently in Flint to align both.
Can I rotate just one page?
Yes. Flint's rotate pages tool lets you pick exactly which pages to rotate. The rest stay as-is.
Will rotation hurt quality?
No. Rotation is metadata, not content. The page data is untouched; only the displayed orientation changes. There's zero quality impact.
Why does iPhone show my PDF rotated but Mac doesn't?
Different viewers respect rotation metadata differently. Permanently rotating the pages in Flint fixes display everywhere because the metadata becomes consistent with the content.
Orientation problems are metadata problems. Rotate the pages permanently in Flint and the file displays right everywhere.