Developer builds script to verify all 8,556 PDF links in 871-page digital planner

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A software developer created a Python-generated 871-page hyperlinked PDF planner containing 8,556 internal link annotations spanning daily, weekly, and monthly pages. To ensure quality, they wrote a verification script using pypdf that checks every link annotation, resolves its destination, and flags anything broken or out of bounds. Beyond basic link resolution, the script performs semantic checks — confirming, for example, that a calendar cell for March 14 actually lands on the correct page — and walks the full 105-week prev/next chain to catch year-boundary off-by-one errors. The shipped build passed with zero broken links out of 8,556 checked, though the script proved its value earlier in development by catching bugs caused by page insertions that silently remapped link destinations. The developer notes that on-device testing in apps like GoodNotes and Notability remains an outstanding gap not covered by the automated checks.

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