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6    <title>Guides: GROBID, PDF Metadata, Citations and Identifiers | GROBID Tools</title>
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30            <a href="/" class="brand">📄 GROBID Tools</a>
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32                <li><a href="/">Extractor</a></li>
33                <li><a href="/guides/what-is-grobid">What is GROBID?</a></li>
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43        <h1>Guides</h1>
44        <p class="meta">Last reviewed on October 3, 2026</p>
45
46        <p>The guides below explain how PDF metadata is structured, how a heuristic extractor goes about pulling it out, and how to make the resulting records useful in a real workflow. They are written for people who handle a lot of academic and technical PDFs and want to understand what the tools are actually doing — and where they fall short.</p>
47
48        <h2>About GROBID</h2>
49        <ul>
50            <li><a href="/guides/what-is-grobid">What is GROBID?</a> — an independent overview of the open-source scholarly PDF parser: what it extracts, how it works, and its TEI XML output.</li>
51            <li><a href="/guides/grobid-docker-and-api">Running GROBID with Docker and the REST API</a> — start a local server, call it with curl, configure Crossref consolidation, and batch-process with the Python client.</li>
52            <li><a href="/guides/grobid-alternatives">GROBID alternatives compared</a> — CERMINE, AnyStyle, Nougat, Docling, Marker, MinerU and reference-manager lookups.</li>
53        </ul>
54
55        <h2>Start here</h2>
56        <ul>
57            <li><a href="/guides/pdf-metadata-extraction">A practical guide to PDF metadata extraction</a> — what counts as metadata in a PDF, where it lives, and how to pull it out cleanly.</li>
58            <li><a href="/guides/citation-parsing">Citation parsing in plain language</a> — how a tool decides where one reference ends and the next begins.</li>
59            <li><a href="/guides/doi-and-identifiers">DOI, arXiv ID, PMID, ORCID, ISBN and ISSN formats</a> — the persistent identifiers that make a citation actually resolvable.</li>
60            <li><a href="/guides/arxiv-identifiers">arXiv identifiers explained</a> — old and new arXiv ID formats, versions, and the arXiv DOI.</li>
61            <li><a href="/guides/find-doi-of-a-pdf">How to find the DOI of a PDF</a> — where DOIs are printed and how to look one up from a title.</li>
62        </ul>
63
64        <h2>Beyond the basics</h2>
65        <ul>
66            <li><a href="/guides/scanned-pdf-and-ocr">Working with scanned PDFs and OCR</a> — what to do when the text layer is missing or unreliable.</li>
67            <li><a href="/guides/client-side-pdf-processing">Why process PDFs in the browser</a> — a tour of the architectural choices behind a privacy-first extractor.</li>
68            <li><a href="/guides/working-with-references">From extracted records to a reference list</a> — turning raw output into something a paper, thesis, or library catalogue can use.</li>
69        </ul>
70
71        <h2>Reference material</h2>
72        <p>

72For format-specific notes — BibTeX, RIS, CSL-JSON, Markdown, DOCX — see the <a href="/formats/">formats reference</a>.</p>
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