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From "Ranganathan, Balaji" <Balaji.Ranganat...@apria.com>
Subject pdf to image conversion Web
Date Sat, 23 Nov 2013 02:34:19 GMT

I am developing a java web application where use will upload a pdf file and the web application
will convert the pdf to png images and send embedded html email.

The pdf is around 6 pages, the application takes around 9 sec to convert the pdf to png using
PDPage.convertToImage method.

When I do a load test of the application with 10 concurrent users the page.convertToImage
take around 60 secs.,
The performance decreases further if the concurrent users are more.

I am using pdfbox 1.8.2

Below is the code I am using to convert to image

PDDocument document = PDDocument.loadNonSeq(new File(pdfFileName), scratchFile);
List<PDPage> pageList = document.getDocumentCatalog().getAllPages();
int pageSize = pageList.size();
String[] retVal = new String[pageSize];
int imgType = BufferedImage.TYPE_BYTE_BINARY;
int i = 0;

for (PDPage page : pageList) {
            BufferedImage image = page.convertToImage(imgType, 133);
            if (image.getGraphics() != null) {
            ImageIOUtil.writeImage(image, "png", prefix + i, imgType, 133);

Let me know if there is any problem with the code. Below is the response out from profiling
web app

I user uploading 10 docs only by one (avg response around 9 sec)


10 users uploading a doc at same time (avg response 66 secs)


Let me know if I am doing any mistakes or converToImage can only be used in desktop applications?

Balaji Ranganathan
Java developer

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