How Can Pdf Files Join Using Command-Line Tools?

2025-09-03 20:09:00 312

4 Answers

Micah
Micah
2025-09-04 16:41:40
I like to script merges when I have a folder full of PDFs. If you prefer a tiny, cross-platform script, Python libraries are handy: pip install pikepdf or PyPDF2. A pikepdf snippet looks like this:

from pikepdf import Pdf
from pathlib import Path
pdf = Pdf.new()
for p in sorted(Path('.').glob('*.pdf')):
pdf.pages.extend(Pdf.open(p).pages)
pdf.save('merged.pdf')

That preserves vector content and is robust for most files. For one-liners, qpdf --empty --pages *.pdf -- merged.pdf works if your shell expands files in the right order. I usually combine a sorted filename scheme (001-, 002-) with a shell glob or a small Python script to get predictable ordering. If files are encrypted you'll need to supply passwords — pikepdf can open them if you pass credentials. For huge batches, chunk your work to avoid high memory use and consider Ghostscript for streamed processing.
Violet
Violet
2025-09-06 00:45:30
If you want a no-fuss way to merge PDFs on the command line, I usually reach for small, dedicated tools first because they do exactly one thing well. On Linux or macOS, 'pdfunite' (part of Poppler) is the simplest: pdfunite file1.pdf file2.pdf merged.pdf — done. If you need more control, 'pdftk' is ancient but powerful: pdftk a=first.pdf b=second.pdf cat a b output merged.pdf, and it supports page ranges like a1-3 b2-5. Both commands are fast, scriptable, and safe for preserving vector content and text.

When I need advanced compression, metadata tweaks, or to repair weird PDFs, I switch to Ghostscript: gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=merged.pdf file1.pdf file2.pdf. You can also add -dPDFSETTINGS=/ebook or /screen to reduce size. On Windows I often use WSL or a native build for these tools. For quick concatenation with modern behavior, qpdf works great: qpdf --empty --pages file1.pdf file2.pdf -- merged.pdf. Each tool has trade-offs (speed vs features vs size), so I pick one depending on whether I care about bookmarks, compression, or fixing broken files.
Hattie
Hattie
2025-09-07 06:53:47
Lately I had to merge hundreds of scanned lecture handouts, and the way I approached it changed depending on whether they were scanned images or generated PDFs. First step: identify if pages are vector/text or raster images using pdfinfo or even just by opening a few. For vector/text PDFs I used qpdf because it can assemble pages without recompressing: qpdf --empty --pages $(ls -1v *.pdf) -- big-merged.pdf. That command is a neat trick — the $(ls -1v *.pdf) builds a numerically sorted list.

If the files are scans, I preprocess with OCR or want to recompress: Ghostscript with -dPDFSETTINGS=/printer gives a good balance of quality and size. For odd files that fail, I run mutool clean broken.pdf fixed.pdf or qpdf --stream-data=uncompress then recompose. I also keep a small bash wrapper that renames files to zero-padded numbers before merging so the order never surprises me. Small utilities like pdftk preserve bookmarks better, so I switch when table-of-contents matters.
Emma
Emma
2025-09-07 15:12:20
I tend to think of merging PDFs as two parts: ordering and tooling. If order matters, rename with leading zeros (001-, 002-) or create a text list and feed it to qpdf. If files are corrupt, mutool clean infile.pdf outfile.pdf salvages a lot more than blind concatenation. For reducing size after a merge, Ghostscript is my go-to: gs -sDEVICE=pdfwrite -dPDFSETTINGS=/ebook -dCompatibilityLevel=1.4 -o out.pdf in.pdf.

A quick tip: avoid ImageMagick's convert for PDFs unless you want rasterized pages — that kills text searching and balloons filesize. If bookmarks or attachments must be preserved, test with a small sample first. I usually run a two-file merge trial, check results, then run the full batch so I don’t have to undo anything later.
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