Drop in a PDF, turn the pages the right way up, and download it with the rotation baked in for good. Everything happens in your browser, your file is never uploaded, so it is safe for confidential drawings. No signup, no email, no watermark.
Each page below is rendered from your own file, in your browser. Use the arrows on a page to turn it 90 degrees; the preview turns with it, so you can see exactly how it will sit. Then download.