Pdfcpu

pdfcpu is a Go PDF processing library and command-line interface designed for programmatically manipulating, optimizing, and validating PDF files. It provides a toolkit for document content modification and structural management.

The project distinguishes itself as an optimization tool and layout engine, capable of reducing file sizes and improving loading speeds by streamlining internal structures. It also functions as a security manager, providing password-based encryption, decryption, and digital signature verification.

Its capability surface includes page management for merging, splitting, cropping, and rotating documents, as well as the extraction of embedded assets like images and fonts. It also supports branding automation through the management of visual overlays such as stamps and watermarks, and provides utilities for managing embedded file attachments and validating document integrity.

Features

PDF Processing Libraries - Provides a comprehensive Go library for programmatically manipulating, optimizing, and validating PDF documents.

PDF Processing Libraries - Provides a comprehensive PDF processing toolkit implemented in the Go programming language.

PDF Manipulation Utilities - Provides utilities for merging, splitting, and restructuring PDF document pages and layouts.

PDF Security Management - Manages password encryption, decryption, and user permission settings to control access to PDF documents.

Document Splitting and Merging - Merges multiple PDF documents into one or divides a single file into several smaller parts.

PDF Layout Operations - Implements tools for modifying document structure, including page rotation, resizing, and content imposition.

Document Content Optimizations - Provides a programmatic interface for cleaning and compressing internal document streams to modify PDF structure.

File Size Optimizations - Rearranges internal object order to improve loading speeds and reduce overall file size through structural optimization.

Page Layout Adjustments - Resizes, rotates, crops, and trims PDF pages to adjust their physical orientation and size.

PDF Storage Optimizations - Reduces PDF file sizes and validates internal structures to improve performance and ensure standard compliance.

Command Line Interfaces - Ships a suite of terminal-based tools for PDF operations like merging, splitting, and encrypting without a graphical interface.

In-Place File Mutators - Modifies the binary structure of PDF files directly on disk to perform optimizations while preserving original formatting.

Cross-Reference Table Mappings - Implements an internal index of object offsets to enable random access and structural modification of the binary PDF document tree.

Document Encryption - Implements standard AES encryption algorithms to secure document content and restrict access via password protection.

Streamed Parsing - Reads document content as a sequence of objects and streams to process large files without loading them entirely into memory.

General PDF Analysis - Extracts and analyzes diverse information, including images and fonts, from PDF documents.

Document Branding Automation - Automates the addition and removal of watermarks and stamps across PDF pages for corporate identification.

Page Overlays - Injects new content streams into the page hierarchy to place visual overlays like watermarks and stamps.

PDF Asset Extractions - Retrieves embedded images, fonts, and metadata from PDF files for external analysis or use.

Document Performance Optimizations - Improves PDF loading speeds and performance through structural optimization and validation.

PDF Security and Signing - Manages PDF password protection, encryption, and the verification of electronic signatures.

Digital Signature Validators - Validates the integrity and authenticity of digital signatures within PDF documents.

Document Access Permissions - Controls document access and functional permissions through password-based encryption and decryption.

Document Validation - Verifies the internal organization of a PDF document to ensure it conforms to technical specifications.

File Handling - PDF processing library.

File Processing - PDF processing library.

Media and Communication - PDF processing library.

PDF Management Tools - Go-based library and tool for processing PDF files.

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Features

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