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GdPicture.NET PDF Reducer SDK

Compress any document to PDF using unrivaled optimization techniques.

The GdPicture.NET PDF Reducer SDK is probably the most complete PDF optimization engine of the market. More than 10 years of continuous research have been required to address all areas of compression and optimization, with a focus on font optimization, data compression, and image analysis.

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GdPicture.NET PDF Optimization

General compression

PDF Optimization is about serializing several compression algorithms to surpass the limitations of some compression schemes while removing unwanted or unused objects and applying several other techniques when necessary.
On this page you will find several categories of optimization, each containing different functionalities, which can be enabled or disabled depending on the document and context.

  • Unused objects removal
  • Content stream compression
  • Object streams generation

Content removal

In a PDF file, many objects can be redundant, unwanted, or unused, and therefore, be removed. This includes:

  • Blank page
  • JavaScript
  • Metadata
  • Thumbnails
  • Form fields
  • Annotations
  • Bookmarks
  • Embedded files
  • Hyperlinks

Control image compression

  • Automatic image re-compression
  • High-quality image downscaling
  • Manage compression scheme: Zlib/deflate, CCITT, JBIG2, JPEG, JPEG 2000

Advanced image compression

  • Color Detection
  • Mixed Raster Content compression (MRC)
  • Enable or disable JBIG2 encoder Pattern matching & substitution (PM&S) mechanism
  • Adjust JPEG-2000 encoding quality
  • Adjust JBIG2 PM&S engine sensitiveness

GdPicture.NET includes many hyper-compression features, check our pages for more information:

JBIG2 Codec ExtensionHyper-Compression EngineHyper-Compression Plugin

Fonts optimization

Fonts used to render the document content are an essential part of the document structure of a PDF, since its main goal is to accurately display your document regardless of software, hardware, or the operating system. Embedded fonts which are becoming mandatory in new PDF Standards are optimized using several techniques:

  • Font Data Stream Compression
  • Subsetting font programs to contain only the used glyphs
  • Font Data Table Reduction
  • Font Merging

You can read our blog articles for more information:

Pack and Optimize Fonts Fonts Optimization in PDF

Other quality enhancement features

PDF optimization also means insuring the quality of a document for optimum reading, without slowing the loading process even on large files.

  • Fast web view (linearization)
  • Repair characters

Areas of use

PDF Optimization is dependent of the context and purpose of documents. Every organization has different contexts to manage, sometimes required by the industry, sometimes by law, or simply by internal usage.
The PDF Optimization SDK allows you to address all contexts by enabling/disabling the features you need.
Below you will find a few examples where PDF optimization needs to be adapted:

Electronic document exchange
Documents must be fast to load, so anything slowing viewing and sharing should be avoided. Small and linearized PDF documents are favored to reduce response times.

Document archiving
Archiving often requires maximum compression of the files to save space. However, if a sufficient resolution is needed to keep a good quality document, redundant or unnecessary content is usually removed.

Pre-press
Printing requires to keep a high resolution for a correct reproduction, colors and transparency need to be preserved.

Example of usage

Optimizing PDF documents in general

Optimizing PDF documents by enabling MRC compression

Optimizing PDF documents by re-compressing images

Optimizing PDF documents by controlling image compressions

you will find screenshots illustrating the various compression options applied to a PDF Optimization solution, PDF Reducer Cloud:

Try our hyper-compression engine with your document

How to use

Download and install GdPicture.NET package from here.

You will find a compiled demo applications in
[Install directory]\Samples\Bin\

You will find an example of a full application (the source code of PDF Reducer) in
[Install directory]\Samples\DotNet\GdPicture.NET 14\WinForm\C#\PDF Reducer

You will find other code snippets within the online reference guide found here http://guides.gdpicture.com

GdPicture.NET - How to use

Do you want to know more about PDF optimization?

We have created an article about issues, constraints, and methods for optimizing PDF files.
The text is based on a presentation held at the PDF Day – France in April 2018.
Organized by the PDF Association, the PDF days are the meeting place of the PDF industry, where experts conduct educational (non-commercial) presentations, panel and discussion-based sessions about the format.


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