Feature Description

LEADTOOLS toolkits include comprehensive PDF reading, writing and viewing technology with advanced capabilities such as the extraction of text, images, hyperlinks and metadata, editing and updating bookmarks and annotations, updating, splitting and merging pages from existing PDF documents, converting to PDF/A as a real document, linearization, and reducing PDF document size with the LEADTOOLS PDF Optimizer. Combined with LEADTOOLS' advanced rasterization and image display technology, developers can take advantage of these properties to enhance their applications with dynamic document viewing, editing and assembly features. Furthermore, programmers using .NET (C# & VB), C/C++ and HTML5 can implement state-of-the-art OCR, OMR, ICR, Forms Recognition, Virtual Printing and scanning technologies within LEADTOOLS to create any type of document and medical imaging application that utilizes the PDF format.

Tested against thousands of PDF documents, the LEADTOOLS PDF SDK provides impeccable accuracy which tops many market-leading PDF reading applications. LEADTOOLS accounts for common errors and differences between PDF file versions to give programmers peace of mind, minimize their testing phase and create the best PDF applications on the market.

Overview of LEADTOOLS PDF SDK Technology

PDF Document Features

  • Load and view any PDF document
  • Extract text (characters, words and lines), fonts, annotations, rectangles and hyperlinks with location and size
  • Extract images from PDF documents and save to any of LEADTOOLS' 150+ file formats
  • Full support for reading, editing and writing native PDF annotations
  • Parse the document structure by reading and updating PDF bookmarks (Table of Contents) and internal links (jumps)
  • Full Unicode support including Chinese, Japanese, Arabic and Hebrew
  • Generate a raster image or thumbnail of any page

PDF File Features

  • Advanced PDF Optimizer analyzes document features to create the smallest file possible
  • Comprehensive multi-page support including
    • Merge existing PDF files into a single PDF
    • Split a single PDF into multiple PDF files
    • Extract, delete, insert or replace any page in existing PDF files
  • Convert any existing PDF to PDF/A
  • Convert (distill) postscript to PDF with optimization for eBook, Screen and Prepress
  • Convert PDF to Vector SVG
  • Linearize (optimize for web viewing) any existing PDF
  • Create Auto-print PDF files
  • Read, write and update the PDF document Table of Contents
  • Read, write and update all PDF metadata such as author, title, subject, keywords and Initial View
  • Read and write PDF Digital Signatures
  • Encrypt/decrypt documents and convert to and from any PDF version

PDF Annotations and Markup

LEADTOOLS supports reading, displaying, editing and writing native PDF annotations and markup that work seamlessly with Adobe Acrobat and other compliant PDF readers. Annotations are an important feature in document imaging, as it allows users to communicate with each other by writing comments and drawing shapes on top of the document without making any permanent changes.

  • Support for all PDF annotation and markup objects
    • Arrow
    • Comment
    • Highlight
    • Line
    • Review
    • Shapes
    • Text
  • Options to control annotation rendering when loading PDF as raster with support for No Appearance Stream annotations
  • Convert PDF annotations to and from LEADTOOLS annotations for live editing
  • Fully functional sample application with source code that implements all of the PDF reading, writing, editing and annotation features

OCR PDF Output

LEADTOOLS allows developers to easily convert any image into a searchable text PDF. Searchable text PDFs are generally smaller in size than the comparable raster image and the embedded text can be searched, indexed and edited as in a word processor.

  • Convert images to searchable text PDF files with as little as three lines of code using LEADTOOLS SDK OCR technology
  • Export as text-only or image-over-text PDF to retain original formatting
  • Multiple PDF versions including 1.2 - 1.7 and PDF/A
  • Multiple compression options for images within the PDF including:
    • JPEG
    • JPEG2000
    • CCITT G3/G4
    • JBIG2
    • LZW
    • MRC
  • Convert entire file or only specified pages
  • Create and update PDF document metadata such as author, title and keywords
  • Protect sensitive data with encrypted PDF documents using RC4 40-bit and RC4 128-bit encryption
  • Control access to the PDF document with User and Owner passwords
  • Options to embed fonts in the PDF file
  • Options to create linearized PDF files for faster web viewing
  • Convert images from disk, memory, Internet or SharePoint

Raster Image PDF Features

In addition to handling text-based PDF files, LEADTOOLS fully supports loading, saving and editing raster image PDFs. This includes rasterizing any text or image-based PDF into thumbnails or full size document images, as well as converting single and multi-page image formats such as JPEG and TIFF into image-based PDF files.

  • Convert any PDF file to and from over 150 supported raster image formats
  • Multiple PDF versions including 1.2 - 1.7 and PDF/A
  • Multiple Compression options including:
    • JPEG
    • JPEG2000
    • CCITT G3/G4
    • JBIG2
    • LZW
    • MRC
  • Specify RGB or CMYK color space
  • Convert entire file or only specified pages
  • Encrypt and decrypt PDF documents using RC4 40-bit and RC4 128-bit encryption
  • Control access to the PDF document with User and Owner passwords
  • Load PDF from disk, memory, Internet and SharePoint

PDF Rasterization Options

At the heart of PDF-to-image conversion is the rasterization process. By nature, PDF documents are made up of vector objects such as text and 2d images. These objects have a relative location based on the physical, printed dimensions. This means that PDFs are dynamic documents which can be rasterized to any pixel dimension based on the DPI (Dots Per Inch) while preserving a high-quality display. LEADTOOLS provides maximum flexibility when rasterizing PDF files and allows the developer to control the quality, size, color and more.

  • Automatically detect the best rasterization options by examining the contents of the PDF
  • Load at any DPI to control overall quality and file size
  • Load at 1, 8 or 24 bits per pixel
  • Render fonts with 2 and 4-bit anti-aliasing resulting in a more readable image
  • Display CIDFonts not embedded in PDF file
  • Detect original DPI of embedded raster images
  • Rescale embedded graphics with 2 and 4-bit anti-aliasing to retain original image quality and reduced graininess

Vector PDF Features

To get the most out of viewing and converting PDF documents, LEADTOOLS provides specialized frameworks for handling PDF files as vector-based documents. Only available in the Document and Medical Imaging product families, these .NET and HTML5/JavaScript frameworks provide the ultimate experience for developing PDF applications with LEADTOOLS.

PDF Forms

LEADTOOLS provides developers everything they need to create applications to use existing PDF Forms. Any field can be read, filled, and saved with the newly entered data.

  • Read PDF form field information (location, type, etc.)
  • Enter data into PDF form fields
  • Extract data from filled forms and save as XML
  • Supports both Acrobat Forms Data (FDF) and Adobe XML Forms Architecture (XFA)

PDF Compression

Maintain quality while maximizing PDF compression with LEADTOOLS advanced image segmentation and compression technologies. The resulting compressed PDF can be loaded and viewed in any PDF viewer that supports standard PDF files. By storing complex mixed raster content (MRC), this process creates PDF files with better compression and quality than a standard raster PDF file.

  • Automatically segment the image with optimization options
  • Manually segment the image to take full control over file size and image quality optimization
  • Multiple compression options including:
    • JPEG
    • JPEG2000
    • CCITT G3/G4
    • JBIG2
    • LZW
    • MRC
  • Automatic background detection
  • Compress single or multi-page PDF files

Explanation of PDF File Types

In general, PDF and PDF/A files can be categorized into two basic types: raster image and searchable text. Raster Image PDFs are comprised of a complete raster image in a PDF wrapper and support multiple compression types including JPEG, JPEG2000, CCITT G3/G4, JBIG2, LZW and MRC. The greatest advantage of raster image PDFs is that they appear identical to the original document. On the other hand, searchable text PDFs are often smaller in size and the text can be searched and edited as in a word processor.

When converting from raster images to searchable text based PDFs, the formatting of the original image is often modified. To alleviate this concern, LEAD has implemented a hybrid type of PDF known as "image over text". In image over text PDFs, the text is formatted as usual, but the original raster image is overlaid on top of the text. This maintains the look and formatting of the original raster image while still allowing the text content to be searched, selected, copied and pasted.

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