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https://issues.apache.org/jira/browse/PDFBOX-3565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15656847#comment-15656847
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Andreas Lehmkühler commented on PDFBOX-3565:
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PDFBox doesn't provides an out-of-the-box compression as it isn't that simple.
One has to san the whole pdf, indentify all uncompresses streams (a pdf may
contain a lot of streams), add a filter to that streams and save the file.
> PDF Compress using PDStream is not working.
> --------------------------------------------
>
> Key: PDFBOX-3565
> URL: https://issues.apache.org/jira/browse/PDFBOX-3565
> Project: PDFBox
> Issue Type: Bug
> Environment: PDFBox 2.0.2 version
> Reporter: Shubhangi Gojir Nipane
> Priority: Blocker
>
> We are trying compress PDF using PDFBox 2.0.2 version.
> As mentioned in PDFBox 2.0.2 migration guide we are using PDSream object with
> COSName.FLATE_DECODE which should compress the pdf.
> 1)
> {code}
> File toCompress = new File("toCompress.pdf");
> File compressedOutputFile = new File("compressedFile.pdf");
> try {
> PDDocument doc = new PDDocument();
> InputStream in = new FileInputStream(toCompress);
> OutputStream out = new FileOutputStream(compressedOutputFile);
> PDPage page = new PDPage();
> doc.addPage(page);
> PDStream stream = new PDStream(doc, in, COSName.FLATE_DECODE);
> doc.save(out);
> doc.close();
> } catch (Exception e) {
> }
> {code}
> above code snippet gives us blank compressed file with size 0.
> 2) We try to load pdf stream data on document and then compress it .
> {code}
> File toCompress = new File("toCompress.pdf");
> File compressedOutputFile = new File("compressedFile.pdf");
> try {
> PDDocument doc = new PDDocument();
> doc.load(toCompress)
> InputStream in = new FileInputStream(toCompress);
> OutputStream out = new FileOutputStream(compressedOutputFile);
> PDPage page = new PDPage();
> doc.addPage(page);
> PDStream stream = new PDStream(doc, in, COSName.FLATE_DECODE);
> doc.save(out);
> doc.close();
> } catch (Exception e) {
> }
> {code}
> here we get new compressed file which is having bigger size than original one.
> So in short for compression using PdfBox 2.0.,2 version is not working.
> Please guide us how to do compress PdfBox 2.0.,2 version.
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