Convert a Document to PDF

The ability to easily and reliably convert documents from one format to another is a key feature of Aspose.Words. One of the most popular formats for converting is PDF – a fixed-layout format, which preserves the original appearance of a document during its rendering on various platforms. The “rendering” term is used in Aspose.Words to describe the process of converting a document into a file format that is paginated or has the concept of pages.

Convert a Word Document to PDF

Conversion from Word to PDF is a rather complex process that requires several stages of calculation. Aspose.Words layout engine mimics the way the Microsoft Word’s page layout engine works, making PDF output documents look as close as possible to what you can see in Microsoft Word.

With Aspose.Words you can programmatically convert a document from DOC or DOCX format to PDF without using Microsoft Office. This article explains how to perform this conversion.

Note that the number of pages in a document affects the conversion time.

Converting DOCX or DOC to PDF

Converting from the DOC or DOCX document format into the PDF format in Aspose.Words is very easy and can be accomplished with just two lines of code that:

Load your document into a Document object using one of its constructors by specifying the document name with its format extension.
Invoke one of the Document.Save methods on the Document object and specify the desired output format as PDF by entering a file name with the “.PDF” extension.

The following code example shows how to convert a document from DOCX into PDF using the Save method:

	// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-Java.git.
	Document doc = new Document(getMyDir() + "Document.docx");
	doc.save(getArtifactsDir() + "BaseConversions.DocxToPdf.pdf");

view raw docx-to-pdf.java hosted with ❤ by GitHub

You can download the template file of this example from Aspose.Words GitHub.

Sometimes it is necessary to specify additional options, which can affect the result of saving a document as a PDF. These options can be specified by the use of the PdfSaveOptions class, containing properties that determine how the PDF output will be displayed.

Note that with the same technique, you can convert any flow-layout format document to PDF format.

Convert to Different PDF Standards

Aspose.Words provides the PdfCompliace enumeration to support the conversion of DOC or DOCX into various PDF format standards (such as PDF 1.7, PDF 1.5, etc.).

The following code example demonstrates how to convert a document to PDF 1.7 using PdfSaveOptions with compliance to PDF17:

	// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-Java.git.
	Document doc = new Document(getMyDir() + "Rendering.docx");

	PdfSaveOptions saveOptions = new PdfSaveOptions(); { saveOptions.setCompliance(PdfCompliance.PDF_17); }

	doc.save(getArtifactsDir() + "WorkingWithPdfSaveOptions.ConversionToPdf17.pdf", saveOptions);

view raw conversion-to-pdf17.java hosted with ❤ by GitHub

Convert Images to PDF

Converting to PDF is not restricted by Microsoft Word document formats. Any format supported by Aspose.Words, including programmatically created, can also be converted to PDF. For example, we can convert single-page images, such as JPEG, PNG, BMP, EMF, or WMF, as well as multi-page images, such as TIFF and GIF, to PDF.

The following code example shows how to convert JPEG and TIFF images to PDF:

	// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-Java.git.
	convertImageToPDF(getImagesDir() + "Logo.jpg", getArtifactsDir() + "BaseConversions.JpgToPdf.pdf");
	convertImageToPDF(getImagesDir() + "Transparent background logo.png", getArtifactsDir() + "BaseConversions.PngToPdf.pdf");
	convertImageToPDF(getImagesDir() + "Windows MetaFile.wmf", getArtifactsDir() + "BaseConversions.WmfToPdf.pdf");
	convertImageToPDF(getImagesDir() + "Tagged Image File Format.tiff", getArtifactsDir() + "BaseConversions.TiffToPdf.pdf");
	convertImageToPDF(getImagesDir() + "Graphics Interchange Format.gif", getArtifactsDir() + "BaseConversions.GifToPdf.pdf");

view raw image-to-pdf.java hosted with ❤ by GitHub

	// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-Java.git.
	/**
	* Converts an image to PDF using Aspose.Words for Java.
	*
	* @param inputFileName File name of input image file.
	* @param outputFileName Output PDF file name.
	* @throws Exception
	*/
	private void convertImageToPDF(String inputFileName, String outputFileName) throws Exception {
	// Create Aspose.Words.Document and DocumentBuilder.
	// The builder makes it simple to add content to the document.
	Document doc = new Document();
	DocumentBuilder builder = new DocumentBuilder(doc);

	// Load images from the disk using the appropriate reader.
	// The file formats that can be loaded depends on the image readers available on the machine.
	ImageInputStream iis = ImageIO.createImageInputStream(new File(inputFileName));
	ImageReader reader = ImageIO.getImageReaders(iis).next();
	reader.setInput(iis, false);

	// Get the number of frames in the image.
	int framesCount = reader.getNumImages(true);

	// Loop through all frames.
	for (int frameIdx = 0; frameIdx < framesCount; frameIdx++) {
	// Insert a section break before each new page, in case of a multi-frame image.
	if (frameIdx != 0)
	builder.insertBreak(BreakType.SECTION_BREAK_NEW_PAGE);

	// Select active frame.
	BufferedImage image = reader.read(frameIdx);

	// We want the size of the page to be the same as the size of the image.
	// Convert pixels to points to size the page to the actual image size.
	PageSetup ps = builder.getPageSetup();
	ps.setPageWidth(ConvertUtil.pixelToPoint(image.getWidth()));
	ps.setPageHeight(ConvertUtil.pixelToPoint(image.getHeight()));

	// Insert the image into the document and position it at the top left corner of the page.
	builder.insertImage(
	image,
	RelativeHorizontalPosition.PAGE,
	0,
	RelativeVerticalPosition.PAGE,
	0,
	ps.getPageWidth(),
	ps.getPageHeight(),
	WrapType.NONE);
	}

	if (iis != null) {
	iis.close();
	reader.dispose();
	}

	doc.save(outputFileName);
	}

view raw convert-image-to-pdf.java hosted with ❤ by GitHub

To make this code work, you need to add references to Aspose.Words, Java.awt.image, and javax.imageio class packages to your project.

Reduce PDF Output Size

When saving to PDF, you can specify whether you want to optimize the output. To do this, you need to set the OptimizeOutput flag to true, and then redundant nested canvases and empty canvases will be removed, neighbor glyphs with the same formatting will be concatenated.

The following code example shows how to optimize the output:

	// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-Java.git.
	Document doc = new Document(getMyDir() + "Rendering.docx");

	PdfSaveOptions saveOptions = new PdfSaveOptions(); { saveOptions.setOptimizeOutput(true); }

	doc.save(getArtifactsDir() + "WorkingWithPdfSaveOptions.OptimizeOutput.pdf", saveOptions);

view raw optimize-output.java hosted with ❤ by GitHub

Using the OptimizeOutput property may affect the accuracy of content display.