Convert PST to HTML, JPG, PNG, PDF Using GroupDocs.Viewer for Java

Are you looking to convert pst to html or other formats like JPG, PNG, or PDF? With the powerful GroupDocs.Viewer for Java library, this task is straightforward and efficient. In this tutorial you’ll learn how to render Outlook PST/OST files into web‑friendly HTML, image files, or a single PDF, making your email archives easy to share and archive.

Convert PST/OST to HTML, JPG, PNG, PDF with GroupDocs.Viewer for Java

What You’ll Learn

  • How to set up GroupDocs.Viewer for Java in a Maven project.
  • Step‑by‑step instructions to java convert pst files to HTML, JPG, PNG, and PDF.
  • Configuration tips for optimal performance and common pitfalls.

Quick Answers

  • What library handles PST conversion? GroupDocs.Viewer for Java.
  • Can I convert PST to PDF directly? Yes, using PdfViewOptions.
  • Is a license required for production? A valid GroupDocs license is needed.
  • Which Java version is supported? JDK 8 or higher.
  • Do I need to extract attachments manually? No, the viewer renders them automatically.

How to convert pst to html using GroupDocs.Viewer for Java

Below you’ll find a concise overview of the conversion process before diving into the detailed code examples.

Why choose GroupDocs.Viewer?

  • High fidelity rendering of email bodies, attachments, and formatting.
  • Multiple output formats (HTML, JPG, PNG, PDF) from a single API.
  • No external dependencies – everything runs inside your Java application.

Prerequisites

  • GroupDocs.Viewer for Java – version 25.2 or later.
  • Java Development Kit (JDK) – 8 or newer.
  • Maven for dependency management.
  • Basic Java knowledge and familiarity with Maven.

Setting Up GroupDocs.Viewer for Java

Add the GroupDocs repository and dependency to your pom.xml:

<repositories>
   <repository>
      <id>repository.groupdocs.com</id>
      <name>GroupDocs Repository</name>
      <url>https://releases.groupdocs.com/viewer/java/</url>
   </repository>
</repositories>
<dependencies>
   <dependency>
      <groupId>com.groupdocs</groupId>
      <artifactId>groupdocs-viewer</artifactId>
      <version>25.2</version>
   </dependency>
</dependencies>

License Acquisition

  • Free trial – explore all features without cost.
  • Temporary license – extend evaluation time if needed.
  • Full license – required for production deployments.

Basic Initialization

import com.groupdocs.viewer.Viewer;
import com.groupdocs.viewer.options.HtmlViewOptions;

public class PSTToHTML {
    public static void main(String[] args) {
        // Initialize Viewer with a sample PST file path
        try (Viewer viewer = new Viewer("YOUR_DOCUMENT_DIRECTORY/SAMPLE_PST")) {
            HtmlViewOptions options = HtmlViewOptions.forEmbeddedResources("output_directory/PST_result.html");
            viewer.view(options);
        }
    }
}

Implementation Guide

The following sections walk you through rendering PST/OST files into each supported format.

Rendering PST/OST Documents to HTML

Step 1: Set Up Output Directory

Path outputDirectory = Paths.get("YOUR_OUTPUT_DIRECTORY");
Path pageFilePathFormat = outputDirectory.resolve("PST_result.html");

Step 2: Configure Load Options

LoadOptions loadOptions = new LoadOptions();
loadOptions.setResourceLoadingTimeout(100);

Step 3: Initialize Viewer and Render HTML

try (Viewer viewer = new Viewer("YOUR_DOCUMENT_DIRECTORY/SAMPLE_PST", loadOptions)) {
    HtmlViewOptions options = HtmlViewOptions.forEmbeddedResources(pageFilePathFormat);
    viewer.view(options);
}

Rendering PST/OST Documents to JPG

Step 1: Set Up Output Directory

Path outputDirectory = Paths.get("YOUR_OUTPUT_DIRECTORY");
Path pageFilePathFormat = outputDirectory.resolve("PST_result_{0}.jpg");

Step 2: Configure Load Options

LoadOptions loadOptions = new LoadOptions();
loadOptions.setResourceLoadingTimeout(100);

Step 3: Initialize Viewer and Render JPG

try (Viewer viewer = new Viewer("YOUR_DOCUMENT_DIRECTORY/SAMPLE_PST", loadOptions)) {
    JpgViewOptions options = new JpgViewOptions(pageFilePathFormat);
    viewer.view(options);
}

Rendering PST/OST Documents to PNG

Step 1: Set Up Output Directory

Path outputDirectory = Paths.get("YOUR_OUTPUT_DIRECTORY");
Path pageFilePathFormat = outputDirectory.resolve("PST_result_{0}.png");

Step 2: Configure Load Options

LoadOptions loadOptions = new LoadOptions();
loadOptions.setResourceLoadingTimeout(100);

Step 3: Initialize Viewer and Render PNG

try (Viewer viewer = new Viewer("YOUR_DOCUMENT_DIRECTORY/SAMPLE_PST", loadOptions)) {
    PngViewOptions options = new PngViewOptions(pageFilePathFormat);
    viewer.view(options);
}

Rendering PST/OST Documents to PDF

Step 1: Set Up Output Directory

Path outputDirectory = Paths.get("YOUR_OUTPUT_DIRECTORY");
Path pageFilePathFormat = outputDirectory.resolve("PST_result.pdf");

Step 2: Configure Load Options

LoadOptions loadOptions = new LoadOptions();
loadOptions.setResourceLoadingTimeout(100);

Step 3: Initialize Viewer and Render PDF

try (Viewer viewer = new Viewer("YOUR_DOCUMENT_DIRECTORY/SAMPLE_PST", loadOptions)) {
    PdfViewOptions options = new PdfViewOptions(pageFilePathFormat);
    viewer.view(options);
}

Practical Applications

  • Email Archiving: Turn large PST archives into searchable HTML or PDF for compliance.
  • Document Management Systems: Store converted files in systems that only accept PDF, PNG, or JPG.
  • Collaboration Platforms: Share converted emails as images in Slack or Teams.
  • Legal Review: Provide courts with PDF versions of email evidence.
  • Backup Strategies: Keep lightweight PNG or JPG snapshots of critical messages.

Performance Considerations

  • Resource Management: Reuse Viewer instances when processing multiple files to reduce overhead.
  • Memory Tuning: Adjust loadOptions.setResourceLoadingTimeout based on server capacity.
  • Asynchronous Processing: Offload conversion to background threads for responsive UIs.

Frequently Asked Questions

Q: How do I convert pst to pdf with the same code base?
A: Use PdfViewOptions as shown in the PDF rendering section; the rest of the code remains identical.

Q: Can GroupDocs.Viewer handle encrypted PST files?
A: Yes, provide the password via LoadOptions.setPassword("yourPassword") before rendering.

Q: What is the difference between java convert pst to PNG vs JPG?
A: PNG preserves lossless quality, ideal for screenshots, while JPG offers smaller file sizes for email previews.

Q: Is there a way to how to convert pst files in bulk?
A: Wrap the rendering logic in a loop that iterates over a directory of PST files; reuse the same Viewer configuration for each file.

Conclusion

You now have a complete, production‑ready guide to convert pst to html, JPG, PNG, and PDF using GroupDocs.Viewer for Java. By following the steps above you can integrate email conversion into any Java‑based workflow, improve accessibility, and meet compliance requirements.

Last Updated: 2026-02-15
Tested With: GroupDocs.Viewer for Java 25.2
Author: GroupDocs