Aspose.PDF FOSS
Java
Developer Guide
PDF File Operations

PDF File Operations

PdfFileEditor

PdfFileEditor provides methods for high-level PDF file manipulation: concatenating documents, extracting page subsets, splitting into individual pages, and inserting pages.

PdfFileEditor editor = new PdfFileEditor();
editor.concatenate("first.pdf", "second.pdf", "merged.pdf");
editor.extract("source.pdf", 2, 5, "pages2to5.pdf");
editor.splitToPages("document.pdf", "output/");

Content Resizing

Use ContentsResizeParameters with ContentsResizeValue to scale page content within existing page boundaries. The six-argument constructor takes values in order: leftMargin, contentsWidth, rightMargin, topMargin, contentsHeight, bottomMargin.

ContentsResizeParameters params = new ContentsResizeParameters(
    ContentsResizeValue.percents(5),
    ContentsResizeValue.percents(90),
    ContentsResizeValue.percents(5),
    ContentsResizeValue.percents(5),
    ContentsResizeValue.percents(90),
    ContentsResizeValue.percents(5)
);
PdfFileEditor editor = new PdfFileEditor();
editor.resizeContents(doc, params);

Large File Handling

For large documents, enable disk buffering to avoid heap exhaustion:

PdfFileEditor editor = new PdfFileEditor();
editor.setUseDiskBuffer(true);
editor.concatenate(inputFiles, "output.pdf");

Related APIs

See also: PdfPageEditor, ContentsResizeParameters, Document.

See Also

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