Convert Markdown to PDF in Java (with Advanced Settings)

Markdown is widely used for writing technical documentation, project notes, README files, and online content. Its lightweight syntax makes documents easy to create, update, and manage.

However, Markdown is not always the best format for sharing. When a document needs to be printed, archived, or distributed to users who do not use Markdown tools, PDF is usually a better choice because it provides a fixed layout and consistent appearance.

In Java applications, automating Markdown-to-PDF conversion can be useful for documentation platforms, report generation systems, and publishing workflows.

This article explains how to convert Markdown files to PDF in Java and how to customize the page settings of the generated PDF document.

Why Convert Markdown to PDF?

Markdown and PDF serve different purposes.

Markdown is convenient during content creation because:

• It is simple and readable.
• It works well with version control systems.
• It separates content from formatting.
• It is easy to maintain.

PDF is more suitable for final distribution because:

• The layout remains consistent across platforms.
• The document can be printed directly.
• It is easier to archive and share.
• Users do not need Markdown editing tools.

Common use cases include:

• Converting technical documentation into PDF manuals.
• Generating reports from Markdown templates.
• Creating downloadable documents automatically.
• Publishing articles or internal knowledge-base content.

Prerequisites

Before converting Markdown files, prepare:

• Java Development Kit (JDK).
• A Java document processing library that supports Markdown loading and PDF export.

In this example, we will use Spire.Doc for Java to handle the document conversion.

Add the Required Dependency

For Maven projects, add the following dependency to your pom.xml file:

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.doc</artifactId>
        <version>14.7.4</version>
    </dependency>
</dependencies>

Convert Markdown to PDF in Java

After adding the dependency, you can load a Markdown file and save it as PDF.

The conversion process only requires a few steps:

• Create a Document object.
• Load the Markdown file.
• Save the document using the PDF format.

import com.spire.doc.Document;
import com.spire.doc.FileFormat;

public class MarkdownToPDF {

    public static void main(String[] args) {

        Document doc = new Document();

        // Load Markdown file
        doc.loadFromFile("Sample.md");

        // Save as PDF
        doc.saveToFile(
                "output/MarkdownToPDF.pdf",
                FileFormat.PDF
        );

        doc.dispose();
    }
}

After running the code, the Markdown content will be converted into a PDF document.

Customize PDF Page Settings

For many documents, the default page layout may not be enough. Reports, manuals, and printed documents often require specific page settings, such as:

• Page size.
• Page orientation.
• Page margins.

Before exporting the PDF, you can configure these settings through the document's PageSetup object.

The following example sets the page size, orientation, and margins before conversion:

import com.spire.doc.Document;
import com.spire.doc.FileFormat;
import com.spire.doc.PageSetup;
import com.spire.doc.Section;
import com.spire.doc.documents.MarginsF;
import com.spire.doc.documents.PageOrientation;
import com.spire.doc.documents.PageSize;

public class MarkdownPageSettings {

    public static void main(String[] args) {

        Document doc = new Document();

        // Load Markdown file
        doc.loadFromFile("Sample.md");

        // Get the document section
        Section section = doc.getSections().get(0);

        // Configure page settings
        PageSetup pageSetup = section.getPageSetup();

        pageSetup.setPageSize(PageSize.A4);

        pageSetup.setOrientation(
                PageOrientation.Portrait
        );

        pageSetup.setMargins(
                new MarginsF(72, 72, 72, 72)
        );

        // Save as PDF
        doc.saveToFile(
                "output/MarkdownToPDF_Custom.pdf",
                FileFormat.PDF
        );

        doc.dispose();
    }
}

With these settings, the generated PDF will use the specified page layout instead of the default configuration.

Additional Tips

• Test complex Markdown content: Documents containing tables, images, or advanced formatting should be checked after conversion.
• Configure page settings based on usage: A4 portrait may work well for articles, while landscape mode may be better for wide tables.
• Keep the original Markdown files: Markdown is easy to update, so keeping the source files makes future modifications easier.
• Release resources properly: When converting multiple files, dispose of document objects after each operation to avoid unnecessary resource usage.

Conclusion

Markdown is an efficient format for creating and maintaining structured content, while PDF is often preferred for final delivery and distribution.

By combining Markdown loading with PDF export capabilities, Java developers can automate the conversion process and integrate it into documentation systems, report generators, and publishing workflows.

Customizing page settings before export also provides more control over the final document layout, making the generated PDFs better suited for different business and publishing scenarios.