PDF merging challenges explained: why naive methods fail and proper techniques

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Merging PDF files is complex because PDFs are structured as object graphs rather than simple text streams. Many implementations incorrectly convert PDF pages to raster images, which destroys text searchability, increases file size, and degrades print quality. Proper merging requires treating PDFs as collections of objects with unique identifiers that must be remapped to avoid conflicts. This process involves parsing cross-reference tables and rewriting object references to combine documents while preserving all original features. Modern browser runtimes can now perform this complex merging locally without uploading files to external servers.

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