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Choose a tool for the PDF task
| Task | Tool to start with | Important qualification |
|---|---|---|
| Merge complete PDFs | pdfunite |
Files appear in the order supplied; source PDFs must not be encrypted. Poppler pdfunite manual |
| Select or split pages | qpdf or pdftk-java | Both document page selection and splitting operations; consult the installed version’s manual for syntax. qpdf manual; pdftk-java manual |
| Rotate pages, fill forms, add stamps or watermarks | pdftk-java | Its manual documents these operations and related commands. pdftk-java manual |
| Extract text already in the PDF | pdftotext |
It converts represented PDF text to plain text; it does not recognize text in page images. Poppler pdftotext manual |
| Make scanned pages searchable | OCRmyPDF | Adds an OCR text layer to image PDFs; install suitable language data for the document. OCRmyPDF installation documentation |
| Edit visible page content with a GUI | LibreOffice Draw | Draw can edit PDF contents, but imported layout may change; review the exported PDF. LibreOffice Getting Started Guide |
| Inspect embedded fonts | pdffonts |
Reports font name, type, encoding, embedding, subset, and Unicode-map information. Poppler pdffonts manual |
Merge PDF files
For a straightforward merge of unencrypted files, pass the inputs to pdfunite in the order they should appear, followed by the output filename:
pdfunite input1.pdf input2.pdf merged.pdf
The resulting pages follow the command-line input order. The Poppler manual specifies that source files must not be encrypted, so this is not the right assumption for password-protected inputs. See the pdfunite manual.
Select pages, split files, or rotate pages
Use qpdf for page selection and structural transformations
qpdf documents page-range selection and split options, making it suitable when you need to extract or divide pages rather than edit their visible contents. Its page-selection syntax has details worth checking against the version installed on your system. Read the qpdf manual.
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Use pdftk-java for page assembly and related operations
pdftk-java documents page assembly with cat, splitting and bursting, as well as page rotation. Its manual also covers forms, stamps, metadata, and attachments. Use the manual for the installed version to choose the exact operation and syntax. Read the pdftk-java manual.
Extract text or make a scan searchable
Extract text from a text-based PDF
Use Poppler’s pdftotext when the PDF contains selectable text. It converts that text to plain text and documents options including page ranges and output selection. See the pdftotext manual.
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Run OCR on scanned pages
A scanned PDF may consist of page images rather than text, so pdftotext alone cannot recover words that are not represented in the file as text. OCRmyPDF adds an OCR text layer to image PDFs, allowing the document to be searched and copied. Check its installation documentation for the available route on your Linux distribution and install the relevant language data. OCRmyPDF documentation
OCR output should be checked against the page image, particularly for names, numbers, and other details where recognition mistakes matter.
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Edit visible content with a graphical interface
LibreOffice Draw is an option when you need to alter text or other visible elements on PDF pages without working at the command line. LibreOffice identifies Draw as specialized PDF-editing software. Open a copy, make the edits, then export and inspect the resulting PDF: the documentation does not promise that every source layout will be preserved without changes. LibreOffice Getting Started Guide
LibreOffice’s PDF export controls include page-range selection and PDF/UA output. The available options can depend on the application version. LibreOffice PDF export help
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Work safely with encrypted or signed PDFs
Keep the original unchanged and save transformations to a separate output file. If a PDF is encrypted, do not assume pdfunite can merge it: its manual requires unencrypted source files. Choose a workflow that accepts the necessary password where you are authorized to use it. pdfunite manual; pdftk-java manual
Take extra care with signed documents. qpdf documents that removing restrictions from a signed PDF invalidates and disables its digital signatures. A transformed copy should not be treated as retaining a valid signature. qpdf manual
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Check tool availability and versions on your distribution
The cited command references are Debian manuals for qpdf in trixie, pdftk-java in bookworm, and Poppler utilities in testing or unstable. They describe the tools, not a guarantee that the same package or version is available on every Linux distribution. Check your distribution’s package source and the installed tool’s documentation before relying on release-specific syntax.
OCRmyPDF’s installation documentation says Debian 12 or newer and Ubuntu 22.04 or newer can use system packages, while warning that distribution packages may lag behind its latest release. Consult the current installation page for other supported installation routes and requirements. OCRmyPDF installation documentation
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