4-Heights® PDF Web Viewer - advanced JavaScript PDF Viewer

PDF Web Viewer: The 4-Heights® PDF Web Viewer is a compact, high-performance, high-quality JavaScript PDF viewer. It offers a multitude of navigational and display options to view and annotate PDF documents using JavaScript or TypeScript. This JS PDF Viewer is mainly characterized by its high rendering quality, performance and its uniform and simple interface. The 4-Heights® generation rendering is even faster and more accurate in displaying complicated PDF pages.

Viewing SDK: The 4-Heights® PDF Viewing SDK is a developer component for integrating PDF viewing and annotation functionality into your application. Currently available in C/C++ and soon to be available in JavaScript and TypeScript.

PDF Viewing and Annotation

Extend your application with PDF viewing and annotation capability. Add images, text or more to your PDF documents.

Seamless Integration

Seamless and efficient integration in your corporate browser and web applications.

Mobile-friendly PDF Viewer

View your PDF documents in high quality in browsers and on mobile devices.


Solution for repairing defective character information

A customer of AXS-One faces the problem of migrating an enormous amount of PDF documents with defective character information to be imported from an old system. PDF Tools made it possible to handle the technical problems posed by migrating a huge volume and to correct defective character information.

Efficient mobile access to information for on-board staff at Deutsche Lufthansa AG

The so-called Electronic Flight Bag (EFB) in use at Lufthansa provides flight personnel with all general, personal and flight-related information on a single end device. Deutsche Lufthansa AG decided to use the 3-Heights™ PDF Viewer by PDF Tools AG.
4-Heights® PDF Web Viewer - Product image

PDF Web Viewer - Features

  • Navigate manually (user action) or programmatically through a document
  • Select between different fit modes: actual size, fit to width, fit to height
  • Rotate and display the page
  • Show thumbnails and use them for navigation
  • Show outlines (Bookmarks)
  • Change language of the GUI (currently English and German supported)
  • Create, edit and delete annotations
    • Text annotations
    • Ink annotations (free hand drawings)
    • Stamp annotations (Draft, Approved, etc.)
    • Freetext annotations
    • Highlight annotations (highlight, strike out, underline, squiggly)
  • Touch handling for mobile devices
  • Enter password to decrypt PDF documents
  • Read document from file or memory or from a blob
  • Supports the Forms Data Format (FDF) file format
  • Basic support for printing PDF files directly from the web browser
  • Viewing-only version for customers who do not use annotations
4-Heights® PDF Web Viewer - Product preview


  • ISO 32000-1 (PDF 1.7)
  • ISO 32000-2 (PDF 2.0)
  • ISO 19005-1 (PDF/A-1)
  • ISO 19005-2 (PDF/A-2)
  • ISO 19005-3 (PDF/A-3)

Supported formats

Input formats

  • PDF 1.0 to 1.7
  • PDF 2.0
  • PDF/A-1, PDF/A-2, PDF/A-3
  • FDF (Form Data Format)

Output formats

  • PDF 1.0 to 1.7
  • PDF 2.0
  • PDF/A-1, PDF/A-2, PDF/A-3
  • FDF (Form Data Format)

Areas of use - mobile-friendly viewer from desktop to mobile devices

Document viewing via browser

Get industry leading rendering quality for high fidelity document presentation. Usable in all corporate areas and in every modern browser. Runs indepently and efficient on every device with corresponding browser.


While viewing and reading the PDF documents in the browser the user is able to add and share notes. Apply pictures, text or more in the PDF documents.

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The versatility of a PDF viewer

The versatility of a PDF viewer

Almost every user knows: a PDF viewer is not just a display tool for a well known document format. It provides many more functions, runs on many platforms, offers interfaces in many technologies and serves as an important component of many applications. When you look closer it is a true miracle.


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