PDF Tool on Mac

Purpose: The tool provides a set of PDF management operations tailored for macOS users. It accepts one or more PDF inputs, applies a chosen sequence of actions, and produces a new PDF or a set of PDFs that preserve document content while enabling efficient workflows. It serves professionals in legal, finance, education, publishing, and design who need consistent, repeatable adjustments without relying on bulky desktop software or manual reassembly.
Core Logic & Features: The core engine supports required operations such as compressing PDFs (downsampling images and optional font embedding), merging multiple PDFs into a single document, splitting by pages or ranges, extracting selected pages, rotating and reordering pages, and applying or removing password protection. Optional advanced controls include DPI targets, PDF/A compliance toggles, metadata handling, and batch processing for multiple files in a run.
Inputs & Outputs: Inputs include one or more PDF files, optional input passwords, page range specifications, operation presets, and an output naming strategy. Outputs provide one or more PDF files, with metadata about total size and page counts; formats can be single consolidated PDF or multiple PDFs if a split or batch is chosen.
Algorithms & Calculations: Compression uses DPI-based downsampling and selective image recompression to achieve target file sizes while maintaining legibility. Merging concatenates document streams; splitting and extraction use explicit page-range logic; rotation and reordering apply page-level transforms. Encryption uses standard PDF 256-bit AES when passwords are provided; output naming is deterministic given user settings. Error & Edge Cases: Handles missing inputs, invalid page ranges, unsupported file formats, and password mismatches with clear validation signals. Detects zero-output results, insufficient disk space, and mixed encrypted/unencrypted inputs. Industry/Region & Localization: Aligns with ISO 32000 PDF standards; supports optional PDF/A-1a/b compliance; units are points for page calculations; uses UTC for timestamps. Assumptions & Exclusions: Assumes input PDFs are well-formed; not a full editor of content; cannot recover passwords if forgotten; does not OCR or edit embedded media; external data sources may be required for format conversions.