PDF Diff Tool

The tool compares two PDF documents to identify content, layout, and object-level differences. It extracts text, fonts, images, and vector shapes per page, aligns pages by index or content cues, and computes diffs at multiple levels including textual changes, font shifts, image differences, and layout movements. It outputs a structured diff report, per-page diffs, and optional visual previews. Inputs can be GitHub file URLs or direct uploads, enabling integration into CI pipelines and code reviews. Unique value lies in multi-layer diffs with automation-friendly exports (JSON, HTML, CSV) and deterministic reporting even for large documents. Use cases include tracking contract amendments, versioned policy documents, and technical specs in development workflows. Core features include robust PDF parsing, page alignment, multi-level diff scoring, and export options. Advanced capabilities include visual diffs, metadata filtering, password handling for protected PDFs, and batch processing via API. The approach emphasizes reproducible results by normalizing non-substantive metadata and reporting only meaningful changes.