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Viewer for Java

Render & display documents
using Java API

Powerful Viewer API to render 180+ document formats into PDF, HTML, and Image with versatile configuration options.

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Version 25.6 released

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// Instantiate Viewer 
try (Viewer viewer = new Viewer("resume.pdf"))
{
    // Set output HTML options, one file per page  
    HtmlViewOptions viewOptions = 
    HtmlViewOptions.forEmbeddedResources();

    // Render PDF to HTML with embedded resources
    viewer.view(viewOptions);
}

<dependencies>
<dependency>
<groupId>com.groupdocs</groupId>
<artifactId>groupdocs-viewer</artifactId>
<version>24.12</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>repository.groupdocs.com</id>
<name>GroupDocs Repository</name>
<url>https://repository.groupdocs.com/repo/</url>
</repository>
</repositories>

GroupDocs.Viewer at a glance

API to render, display, convert documents, slides, diagrams, and many other document types in Java applications

View documents efficiently & reliably

With GroupDocs.Viewer API you can efficiently render documents of any supportable formats to HTML, JPEG, PNG, and PDF with flexible and powerful options while maintaining content and document structure integrity. GroupDocs.Viewer works on Windows and Linux platforms.

Most popular file and document formats are supported

We support rendering over the 180 most popular file and document formats that include Word, Excel, PDF, PowerPoint, OpenDocument formats family, Archives, Raster and Vector images, e-Books, programming languages and markups, and many other file types, including encrypted files with password protection.

Customizable output

GroupDocs.Viewer allows not only to render the document, but also to control how exactly, which parts of the document should be rendered or now, how they should be rendered, and to apply different transformations to the rendered output.

Web UI for Spring framework

We provide an open source UI package for Spring framework that can be added to your project in a couple of minutes. The Viewer.UI package contains an Angular-based web-UI and delivers a set of useful APIs and data storage providers.

Platform independence

GroupDocs.Viewer for Java supports the following operating systems, frameworks and package managers

Supported file formats

GroupDocs.Viewer for Java supports operations with the following file formats.

Microsoft Office, OpenDocument and text formats

Word: DOC, DOCX, DOCM, DOT, DOTX, DOTM, RTF, TXT
Excel: XLS, XLSX, XLSM, XLSB, XLTM, XLT, XLTM, XLTX
PowerPoint: PPT, PPTX, PPS, PPSX, PPSM, POT, POTM, POTX, PPTM
Project: MPP, MPT, MPX
Outlook: MSG, EML, EMLX, PST, OST
OneNote: ONE
OpenDocument: ODT, OTT, ODS, ODP, OTP, OTS, ODG
Fixed Page Layout: PDF, TEX, XPS, OXPS
e-Books: EPUB, MOBI, DjVu
Delimiter-Separated Values: CSV, TSV

Images, Graphics & Diagrams

Raster images: BMP, GIF, JPG, PNG, TIFF, WebP, DNG, DIB, Jpeg2000 family
Windows Icon: ICO
Scalable Vector Graphics: SVG, CDR, CMX, IGS, SVGZ
Adobe Photoshop: PSD, PSB
Stereo Lithography (3D Printing): STL
Medical Imaging: DICOM
Plotter Documents: PLT, HPG
Autodesk Design Web Formats: DWF, DWG
AutoCAD Drawing: DWT, IFC, STL, CF2

Other

Web: HTML, MHT, MHTML, XML
Metafile: WMF, EMF, CGM, EMZ, WMZ
Visio: VSD, VDX, VSS, VSSX, VSX, VST, VSTX, VTX, VSDX, VDW, VSTM, VSSM, VSDM
Project: MPP, MPT, MPX
PostScript: PS, EPS
Archives: ZIP, TAR, BZ2, GZ, RAR, RAR5
Other: VCF, VCARD, NUMBERS, NSF, OBJ
C/C++/C# Files: C, CC, C# , CPP, CXX, CS, H, HH, M, MM
Java/JavaScript Files: JAVA, JS, JSON, PROPERTIES

GroupDocs.Viewer features

Seamlessly render, display, and convert PDF and Office Documents

View documents in HTML

Convert document of any type into a HTML document with CSS and SVG, which can be displayed in any modern web-browser.

Rasterize documents

Rasterize any supportable document format to the raster image, with adjustable image format and compression quality.

Render and highlight programming codes

Support of all popular programming, scripting, and markup languages, with ability to parse and highlight their syntax.

Convert to PDF

Document of any supportable format can be easily converted and saved to the PDF with adjustable options.

Apply transformations

Output document can be transformed during rendering - pages can be rotated and/or rearranged, and text watermark may be placed atop of them.

HTML output adjustment

Output HTML documents, generated by the GroupDocs.Viewer, can be tuned very finely: it is allowed to save to the stream or file, with external or embedded resources, callbacks and so on.

Support of complex document structures

GroupDocs.Viewer supports not only the single documents, but also files, which internally contain a list or hierarchical structure of documents, like email messages with attachments, ZIP archives with internal files within folders, multi-page TIFF images, and so on.

Optimization options

GroupDocs.Viewer contains an adjustable cache subsystem, which can fasten the loading time by using the cached versions of the documents. Also a set of different options for different formats allows to exclude some unnecessary parts or aspects of documents from the rendering (fonts, hidded worksheets, email attachments) to optimize the overall performance

Support of password-protected documents

GroupDocs.Viewer allows to open the encrypted documents of different types: PDF, WordProcessing, Spreadsheet, Presentation, and other, by specifying a password in the loading options.

Code samples

Some use cases of typical GroupDocs.Viewer for Java operations

Render DOCX to HTML

The HtmlViewOptions class properties allow you to control the conversion process, more on that here. For instance, you can embed all external resources in the output HTML file, minify the output file, and optimize it for printing.

Java

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

// Instantiate Viewer
try (Viewer viewer = new Viewer("resume.docx"))
{
    // Set output HTML options
    HtmlViewOptions options = 
    HtmlViewOptions.forEmbeddedResources();

    // Render DOCX to HTML with embedded resources
    viewer.view(options);
}

Export PPTX to PDF

Create a PdfViewOptions class instance and pass it to the Viewer.View method to convert a PowerPoint PPTX file to PDF. The PdfViewOptions class properties allow you to control the conversion process. For instance, you can protect the output PDF file, reorder its pages, and specify the quality of document images. Refer to the following documentation section for details.

Java

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

// Instantiate Viewer
try (Viewer viewer = new Viewer("presentation.pptx"))
{            
    // Set output PDF options
    PdfViewOptions viewOptions = new PdfViewOptions();

    // Export PPTX to PDF
    viewer.view(viewOptions);
}