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Updated Oct 16, 2026

Utilities

Merge PDF files in filename order with PDFtk

pdftk-merge is a PDF concatenation node powered by PDFtk Java that follows filename order.

Agent
Combine ordered PDF documentsCheck merged page countsRetain text and order evidence

overview

What pdftk-merge does

Supply 2 to 10 top-level PDF files. Native PDFtk Java concatenates them in case-sensitive filename order and returns merged.pdf, dump-data.txt, text.txt and summary.json with input order, page counts and output hash. Source files remain unchanged.

Inputs are limited to 16 MiB per file, 32 MiB total and 100 merged pages. Nested files, symbolic links and password inputs are unsupported. Each native step has a 120-second timeout and Java heap is 256 MiB. Concatenation can change PDF signatures and interactive forms.

Input or native processing failures fail the operation. The operation keeps the supplied source unchanged.

This operation uses 3.3.2. Upstream license: GPL-2.0-or-later. The source link identifies the program used by this node.

source sources.debian.org/src/pdftk-java/3.3.2-1/

use cases

Where pdftk-merge fits

Combine ordered PDF documents

Use filenames to control the order of complete input PDFs.

Check merged page counts

Review native page metadata alongside the merged PDF.

Retain text and order evidence

Keep summary.json and extracted text to check the concatenation order.

reference

pdftk-merge inputs and flags

1 inputs
NameTypeFlagDescription
sourceFOLDER--sourceFolder of 2-10 top-level regular .pdf files, sorted by case-sensitive filename. Up to 16 MiB/file, 32 MiB total and 100 merged pages. No passwords, symlinks or nested files; 120 seconds per native step, 256 MiB Java heap. Input unchanged.

Showing key inputs. pdftk-merge exposes 1 inputs in total.

example

Run pdftk-merge

pdftk-merge · command
python3 /app/run.py --source ./source ./output
sample output
{
  "input_order": [
    "01-first.pdf",
    "02-second.pdf"
  ],
  "input_pages": [
    2,
    1
  ],
  "output_pages": 3
}

guidance

Choosing pdftk-merge

Use this node to concatenate complete PDF files in explicit filename order. qpdf offers broader structural PDF operations. This operation checks page/text results, not signature or interactive-form fidelity.

qpdf

Offers other structural PDF operations; this node concatenates whole files in filename order.

faq

pdftk-merge questions

source: Folder of 2-10 top-level regular .pdf files, sorted by case-sensitive filename. Up to 16 MiB/file, 32 MiB total and 100 merged pages. No passwords, symlinks or nested files; 120 seconds per native step, 256 MiB Java heap. Input unchanged.

Merged PDF and evidence. Native processing must succeed before an output artifact is returned.

Inputs are limited to 16 MiB per file, 32 MiB total and 100 merged pages. Nested files, symbolic links and password inputs are unsupported. Each native step has a 120-second timeout and Java heap is 256 MiB. Concatenation can change PDF signatures and interactive forms.

Use this node to concatenate complete PDF files in explicit filename order. qpdf offers broader structural PDF operations. This operation checks page/text results, not signature or interactive-form fidelity.

The image repository also contains a digest-bound source/notices artifact. Download it with oras pull docker.io/nenadzaric/skills-intel-pdftk-merge@sha256:391b61bc8210c65211bad091155b68c6e3c569fb322f26e3ddea727ff969dcd3. The bundle includes the build recipe, licenses, copied notices and component-source directions. Bundle SHA256: ae9e3fd760e13d5d426b9d4e03dfc4b5a637e5bedaea1074adb211ff6657c79d. Follow its source directions for upstream archives and patches. Image and source/notices repository.

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Run pdftk-merge yourself

The synthetic run checks merged pdf and evidence. The excerpt shows selected native fields asserted by saved passing platform verifier; reconstructed excerpt, not full raw artifact. The command shown is the container entrypoint with example paths, not a host-installed CLI command.

Open pdftk-merge in the libraryBuild a workflow with it

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