#pymupdf

📄The Invisible Text Layer of a Searchable PDF Is Misaligned in Vertical Text — Identifying the Cause (the Source PDF's /Rotate) and Fixing It Without Re-OCR

For a searchable PDF that overlays an OCR invisible text layer on a scanned image, this article identifies the cause of the invisible text drifting on a vertically written document (a double rotation of the coordinate system caused by the source PDF's /Rotate, plus an offset in the line origin) and summarizes how to fix only the invisible text layer without re-running OCR.