PDF Compare Tool

This tool compares two PDF documents to identify textual and visual differences. It aligns pages by index and generates per-page diff data with highlights for added, removed, or changed content. It supports text-based PDFs and, when OCR is enabled, scanned documents are processed to extract readable text. The core value is to accelerate review cycles for legal, QA, and content teams by producing a reliable diff narrative and exportable reports.\n\nConceptually, the system extracts text from the PDFs or OCR layers, compares content using sequence alignment to detect insertions, deletions, and modifications, and aggregates results into metrics such as pages changed and words altered. For images and graphics, a region-based diff highlights visual differences within a defined tolerance. The output includes a per-page diff, a total summary, and optional export formats that integrate with downstream workflows.\n\nWho benefits include contract attorneys validating revisions, editors validating version history, researchers auditing translations, and product teams tracking specification changes. The tool is designed for pairwise comparisons, supports encrypted inputs via password, and can be integrated into automated pipelines via API. Its unique value lies in combining textual and image diffs in a single report, reducing manual inspection and enabling precise revision tracking.