Copying And Modification

createWriterToModify opens a PDF for incremental modification, either from a file path or compatible input/output streams. Use PDFPageModifier to add content to an existing page.

appendPDFPagesFromPDF, mergePDFPagesToPage, and createFormXObjectsFromPDF provide writer-level document composition. createPDFCopyingContext creates a DocumentCopyingContext for page-level append/merge, form creation, source reader access, and advanced object copying.

mergePDFPagesToPage invokes its optional callback synchronously with no arguments and the global object (globalThis) as this, including for strict functions. Bound functions retain their bound receiver; arrow functions retain their lexical this.

Advanced copying methods include copyObject, copyDirectObjectWithDeepCopy, copyNewObjectsForDirectObject, and replaceSourceObjects.

Page append and source-page indexes in the low-level copying API are zero-based. Always finish a copying context with end() after its final operation. Form creation from a source page returns an object ID, not a placeable form object.

var writer = muhammara.createWriter("combined.pdf");
writer.appendPDFPagesFromPDF("source.pdf");
writer.end();

See Copy And Embed PDFs and Modify Existing PDFs for workflows.