qpdf

Active

qpdf.sourceforge.io

Country: United States (US)
Founded: 2001
Developer: Jay Berkenbilt
Pricing: Free (open-source)
Open source: Yes
Platforms: Linux, macOS, Windows

Indexes

PDF Tools

Overview

QPDF is a command-line program and C++ library that performs content-preserving transformations on PDF files, such as linearization, encryption, decryption, merging, splitting, and inspection of PDF structure.¹²⁴ It is designed for developers working with PDF-producing software and users needing low-level programmatic or command-line manipulation of PDF internals, without rendering, text extraction, or conversion to other formats.²⁴

Key Features

Linearization - Optimizes PDFs for fast web viewing by reorganizing file structure.
Encryption/Decryption - Adds or removes PDF encryption while preserving content.
Merging/Splitting - Copies objects and manipulates page lists to combine or divide PDFs.
Object Stream Handling - Converts PDFs to or from compressed object streams.
JSON Representation - Generates unambiguous JSON of PDF structure for inspection or editing.
PDF Creation - Builds PDFs from scratch, handling syntax, cross-references, and streams.
Inspection - Exposes PDF internals for analysis by developers.
Rotation - Supports rotating pages in PDF files.

Pricing

Plan	Price	Includes
Community	Free	Full access to all features via source or binaries.

Platforms & Requirements

QPDF runs on Linux, macOS, and Windows as a command-line tool and C++ library; requires a C++17-compliant compiler for building.² Binaries available via package managers like Chocolatey on Windows, AppImage on Linux, and Homebrew on macOS; no mobile or web support.

Integrations & Ecosystem

C++ library for programmatic use
pkg-config (libqpdf)
CMake integration
JSON import/export for PDF structure
Object copying between PDFs
GitHub source repository
ReadTheDocs manual
Package managers (Chocolatey, AppImage)

Alternatives

App	Difference
Poppler	Focuses on PDF rendering and utilities like pdftotext, unlike qpdf's structural transformations.
MuPDF	Emphasizes lightweight rendering and conversion, not low-level structure manipulation.
pdftk	Provides simpler command-line PDF operations but lacks qpdf's library and advanced features like JSON.
Ghostscript	Full PostScript/PDF interpreter for rendering and conversion, heavier than qpdf's lightweight approach.

Reputation

QPDF is regarded as a reliable, lightweight tool for precise PDF structure manipulation, praised by developers for its content-preserving transformations and library utility.¹²³ It has been actively maintained since 2001 with regular releases up to version 12.3.2, hosted on GitHub and SourceForge.²⁷ Criticisms include its command-line nature limiting accessibility for non-technical users and lack of high-level page content interfaces or rendering.²

Sources (8)