1<!DOCTYPE html> 2<html lang="en"> 3<head> 4 <meta charset="UTF-8"> 5 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 6 7 <!-- Primary Meta Tags --> 8 <title>GROBID Tools: Free PDF Metadata, DOI & Reference Extractor (In-Browser)</title> 9 <meta name="title" content="GROBID Tools: Free PDF Metadata, DOI & Reference Extractor (In-Browser)"> 10 <meta name="description" content="Free in-browser PDF extractor: title, authors, DOI, arXiv ID and references, exported as BibTeX, RIS or CSL-JSON. Files never leave your device."> 11 12 <!-- Open Graph / Facebook --> 13 <meta property="og:type" content="website"> 14 <meta property="og:url" content="https://grobid.org/"> 15 <meta property="og:title" content="GROBID Tools: Free PDF Metadata, DOI & Reference Extractor (In-Browser)"> 16 <meta property="og:description" content="Free in-browser PDF extractor for title, authors, DOI, arXiv ID and references, with BibTeX, RIS and CSL-JSON export. Files never leave your device."> 17 <meta property="og:updated_time" content="2026-10-03"> 18 <meta name="last-modified" content="2026-10-03"> 19 20 <!-- Twitter --> 21 <meta property="twitter:card" content="summary"> 22 <meta property="twitter:url" content="https://grobid.org/"> 23 <meta property="twitter:title" content="GROBID Tools: Free PDF Metadata, DOI & Reference Extractor (In-Browser)"> 24 <meta property="twitter:description" content="Free in-browser PDF extractor for title, authors, DOI, arXiv ID and references, with BibTeX, RIS and CSL-JSON export. Files never leave your device."> 25 26 <!-- Favicon --> 27 <link rel="icon" type="image/svg+xml" href="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Ctext y='.9em' font-size='90'%3Eð%3C/text%3E%3C/svg%3E"> 28 29 <!-- Canonical URL --> 30 <link rel="canonical" href="https://grobid.org/"> 31 32 <!-- Preconnect for performance --> 33 <link rel="preconnect" href="https://cdn.jsdelivr.net" crossorigin> 34 35 <!-- Manifest for PWA --> 36 <link rel="manifest" href="/manifest.json"> 37 <meta name="theme-color" content="#2563eb"> 38 39 <!-- Critical CSS - Inlined for performance --> 40 <style> 41 *,*::before,*::after{box-sizing:border-box;margin:0;padding:0} 42 :root{--primary:#2563eb;--primary-dark:#1e40af;--success:#10b981;--text:#1f2937;--text-light:#6b7280;--bg:#ffffff;--bg-secondary:#f9fafb;--border:#e5e7eb;--shadow:0 1px 3px rgba(0,0,0,.1)} 43 body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale} 44 .container{max-width:1200px;margin:0 auto;padding:1rem} 45 header{text-align:center;padding:3rem 1rem 2rem;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:white;margin-bottom:3rem} 46 h1{font-size:2.5rem;font-weight:700;margin-bottom:.5rem;line-height:1.2} 47 .subtitle{font-size:1.25rem;opacity:.95;font-weight:400} 48 .privacy-badge{display:inline-flex;align-items:center;gap:.5rem;background:rgba(255,255,255,.2);padding:.5rem 1rem;border-radius:2rem;margin-top:1rem;font-size:.9rem;backdrop-filter:blur(10px)} 49 .tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem;margin-bottom:3rem} 50 .tool-card{background:white;border:1px solid var(--border);border-radius:.5rem;padding:1.5rem;transition:transform .2s,box-shadow .2s} 51 .tool-card:hover{transform:translateY(-2px);box-shadow:0 10px 25px rgba(0,0,0,.1)} 52 .tool-icon{font-size:2rem;margin-bottom:.5rem} 53 .tool-title{font-size:1.25rem;font-weight:600;margin-bottom:.5rem;color:var(--text)} 54 .tool-desc{color:var(--text-light);margin-bottom:1rem;font-size:.95rem} 55 .btn{display:inline-block;padding:.75rem 1.5rem;background:var(--primary);color:white;border:none;border-radius:.375rem;font-size:1rem;font-weight:500;cursor:pointer;text-decoration:none;transition:background .2s;text-align:center} 56 .btn:hover{background:var(--primary-dark)} 57 .btn-secondary{background:var(--bg-secondary);color:var(--text);border:1px solid var(--border)} 58 .btn-secondary:hover{background:#e5e7eb} 59 .upload-zone{border:2px dashed var(--border);border-radius:.5rem;padding:3rem 2rem;text-align:center;cursor:pointer;transition:all .2s;background:var(--bg-secondary);margin-bottom:2rem} 60 .upload-zone:hover,.upload-zone.dragover{border-color:var(--primary);background:#eff6ff} 61 .upload-icon{font-size:3rem;margin-bottom:1rem;opacity:.6} 62 .hidden{display:none} 63 .results{background:white;border:1px solid var(--border);border-radius:.5rem;padding:1.5rem;margin-bottom:2rem} 64 .results h3{margin-bottom:1rem;color:var(--text)} 65 .metadata-grid{display:grid;gap:1rem} 66 .metadata-item{display:grid;grid-template-columns:150px 1fr;gap:1rem;padding:.75rem;background:var(--bg-secondary);border-radius:.375rem} 67 .metadata-label{font-weight:600;color:var(--text)} 68 .metadata-value{color:var(--text-light);word-break:break-word} 69 .features{background:var(--bg-secondary);padding:3rem 1rem;margin:3rem -1rem} 70 .features h2{text-align:center;font-size:2rem;margin-bottom:2rem} 71 .feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem;max-width:1200px;margin:0 auto} 72 .feature-item{text-align:center} 73 .feature-icon{font-size:2.5rem;margin-bottom:1rem} 74 .feature-title{font-size:1.1rem;font-weight:600;margin-bottom:.5rem} 75 .feature-desc{color:var(--text-light);font-size:.95rem} 76 .site-nav{background:#fff;border-bottom:1px solid var(--border);padding:.75rem 1rem;position:sticky;top:0;z-index:50} 77 .site-nav-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap} 78 .site-nav .brand{font-weight:700;color:var(--text);text-decoration:none;font-size:1.1rem} 79 .site-nav ul{list-style:none;display:flex;gap:1.25rem;flex-wrap:wrap} 80 .site-nav a{color:var(--text-light);text-decoration:none;font-size:.95rem} 81 .site-nav a:hover{color:var(--primary)} 82 footer{padding:2rem 1rem;color:var(--text-light);border-top:1px solid var(--border);margin-top:3rem} 83 .footer-inner{max-width:1200px;margin:0 auto;display:flex;flex-direction:column;gap:.5rem;align-items:center;text-align:center} 84 .footer-links{display:flex;flex-wrap:wrap;gap:.5rem 1rem;justify-content:center} 85 .footer-links a{color:var(--primary);text-decoration:none;font-size:.9rem} 86 .footer-links a:hover{text-decoration:underline} 87 .last-reviewed{font-size:.85rem;color:var(--text-light);text-align:center;margin:1rem 0} 88 .doc-page{max-width:760px;margin:2rem auto;padding:0 1rem;line-height:1.7} 89 .doc-page h1{font-size:2rem;margin-bottom:.5rem;color:var(--text)} 90 .doc-page h2{font-size:1.4rem;margin:2rem 0 .75rem;color:var(--text)} 91 .doc-page h3{font-size:1.1rem;margin:1.5rem 0 .5rem;color:var(--text)} 92 .doc-page p,.doc-page li{color:var(--text);margin-bottom:.75rem} 93 .doc-page ul,.doc-page ol{padding-left:1.5rem;margin-bottom:1rem} 94 .doc-page a{color:var(--primary)} 95 .doc-page .meta{color:var(--text-light);font-size:.9rem;margin-bottom:1.5rem} 96 .loading{display:inline-block;width:20px;height:20px;border:3px solid rgba(255,255,255,.3);border-radius:50%;border-top-color:white;animation:spin 1s linear infinite} 97 @keyframes spin{to{transform:rotate(360deg)}} 98 @media(max-width:768px){h1{font-size:2rem}.tools-grid{grid-template-columns:1fr}.metadata-item{grid-template-columns:1fr;gap:.5rem}} 99 </style> 100 101 <!-- Structured Data (JSON-LD) --> 102
102<script type="application/ld+json"> 103 { 104 "@context": "https://schema.org", 105 "@type": "WebApplication", 106 "name": "GROBID Tools", 107 "description": "Free in-browser PDF extractor for title, authors, DOI, arXiv ID and references, with BibTeX, RIS and CSL-JSON export. Independent site, not affiliated with the GROBID project.", 108 "url": "https://grobid.org/", 109 "applicationCategory": "UtilitiesApplication", 110 "operatingSystem": "Any (Browser-based)", 111 "offers": { 112 "@type": "Offer", 113 "price": "0", 114 "priceCurrency": "USD" 115 }, 116 "featureList": [ 117 "PDF metadata extraction", 118 "DOI extraction", 119 "Citation parsing", 120 "Bibliography extraction", 121 "BibTeX, RIS and CSL-JSON export", 122 "Client-side processing", 123 "Offline support", 124 "Privacy-focused" 125 ] 126 } 127 </script>
vendor: 1 bytes, line 127
127
128<script type="application/ld+json"> 129{ 130 "@context": "https://schema.org", 131 "@type": "FAQPage", 132 "mainEntity": [ 133 { 134 "@type": "Question", 135 "name": "Is this the official GROBID website?", 136 "acceptedAnswer": { 137 "@type": "Answer", 138 "text": "No. GROBID Tools is an independent site. The GROBID library is an open-source project developed on GitHub at github.com/kermitt2/grobid, with documentation at grobid.readthedocs.io. This site offers a separate, lightweight in-browser extractor and guides about GROBID and bibliographic formats." 139 } 140 }, 141 { 142 "@type": "Question", 143 "name": "Does the extractor upload my PDF?", 144 "acceptedAnswer": { 145 "@type": "Answer", 146 "text": "No. The PDF is opened with PDF.js inside your browser and the extracted data is generated locally. The site uses Google Analytics for page-level visit statistics, but file names, file contents and extracted text are never sent anywhere." 147 } 148 }, 149 { 150 "@type": "Question", 151 "name": "Does this tool use the GROBID machine-learning models?", 152 "acceptedAnswer": { 153 "@type": "Answer", 154 "text": "No. It uses lightweight heuristics (layout, font size and regular expressions) that run in the browser. GROBID itself is a Java service with trained models and gives more accurate, more structured results on large collections. See the guide on running GROBID with Docker." 155 } 156 }, 157 { 158 "@type": "Question", 159 "name": "Which export formats are available?", 160 "acceptedAnswer": { 161 "@type": "Answer", 162 "text": "JSON, plain text, Microsoft Word (.docx), Markdown, BibTeX (.bib), RIS (.ris) and CSL-JSON. Reference strings are exported as found in the PDF, with any DOI, year and URL detected in them, so check them before citing." 163 } 164 }, 165 { 166 "@type": "Question", 167 "name": "Does it work with scanned PDFs?", 168 "acceptedAnswer": { 169 "@type": "Answer", 170 "text": "Only if the PDF already has a text layer. Image-only scans need OCR first; the tool warns you when it finds almost no text." 171 } 172 } 173 ] 174} 175</script>
175 176<!-- Google tag (gtag.js) -->
vendor: 64 bytes, lines 176-177
176 177<script async src="https://www.googletagmanager.com/gtag/js?id=
177G-H1FWND0S6P
vendor: 12 bytes, line 177
177"></script>
178<script> 179
vendor: 134 bytes, lines 179-183
179window.dataLayer = window.dataLayer || []; 180 function gtag(){dataLayer.push(arguments);} 181 gtag('js', new Date()); 182 183 gtag('config', '
183G-H1FWND0S6P
vendor: 4 bytes, line 183
183');
184</script>
184</head> 185<body> 186 <!-- Site Navigation --> 187 <nav class="site-nav" aria-label="Primary"> 188 <div class="site-nav-inner"> 189 <a href="/" class="brand">ð GROBID Tools</a> 190 <ul> 191 <li><a href="/">Extractor</a></li> 192 <li><a href="/guides/what-is-grobid">What is GROBID?</a></li> 193 <li><a href="/guides/">Guides</a></li> 194 <li><a href="/formats/">Formats</a></li> 195 <li><a href="/about">About</a></li> 196 <li><a href="/contact">Contact</a></li> 197 </ul> 198 </div> 199 </nav> 200 201 <!-- Header --> 202 <header> 203 <h1>GROBID Tools: PDF Metadata & Reference Extractor</h1> 204 <p class="subtitle">Pull the title, authors, DOI, arXiv ID and reference list out of a PDF, right in your browser</p> 205 <div class="privacy-badge"> 206 <span>ð</span> 207 <span>Private by design: your PDF is never uploaded</span> 208 </div> 209 </header> 210 211 <!-- Main Content --> 212 <main class="container"> 213 <p style="max-width:860px;margin:0 auto 2rem;padding:1rem 1.25rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:.5rem;color:var(--text);font-size:.95rem;"> 214 <strong>Looking for the GROBID library itself?</strong> This is an independent website and is not affiliated with the GROBID project. The open-source GROBID software lives at <a href="https://github.com/kermitt2/grobid" rel="noopener">github.com/kermitt2/grobid</a> with official documentation at <a href="https://grobid.readthedocs.io/" rel="noopener">grobid.readthedocs.io</a>. Our guides explain <a href="/guides/what-is-grobid">what GROBID is</a> and <a href="/guides/grobid-docker-and-api">how to run it with Docker and its REST API</a>. 215 </p> 216 217 <!-- PDF Upload Zone --> 218 <section id="upload-section"> 219 <div class="upload-zone" id="dropZone" role="button" tabindex="0" aria-label="Choose a PDF file to analyse"> 220 <div id="dropZoneContent"> 221 <div class="upload-icon">ð</div> 222 <h2>Drop PDF Here or Click to Choose</h2> 223 <p style="color: var(--text-light); margin-top: 0.5rem;">Processed locally in your browser. Maximum file size: 50MB</p> 224 </div> 225 </div> 226 <input type="file" id="fileInput" accept=".pdf,application/pdf" class="hidden"> 227 <p style="text-align:center;color:var(--text-light);font-size:.9rem;margin:-1rem auto 2rem;max-width:760px;">ð¡ Best results with text-based (born-digital) PDFs. Scanned or image-only PDFs need <a href="/guides/scanned-pdf-and-ocr">OCR first</a>. This is a lightweight heuristic extractor; for large-scale, high-accuracy parsing see <a href="/guides/what-is-grobid">the open-source GROBID library</a>.</p> 228 </section> 229 230 <!-- Results Section (Hidden by default) --> 231 <section id="results-section" class="hidden"> 232 <div class="results"> 233 <h3>ð Extracted Metadata</h3> 234 <div id="metadata-container" class="metadata-grid"></div> 235 </div> 236 237 <div class="results"> 238 <h3>ð Citations & References</h3> 239 <div id="citations-container"></div> 240 </div> 241 242 <div class="results"> 243 <h3>ð¾ Export Options</h3> 244 <div style="display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin-bottom: 1rem;"> 245 <button class="btn" id="downloadJson">ð JSON Data</button> 246 <button class="btn" id="downloadText">ð Plain Text (.txt)</button> 247 <button class="btn" id="downloadDocx">ð Word Document (.docx)</button> 248 <button class="btn" id="downloadMarkdown">ð Markdown (.md)</button> 249 <button class="btn" id="downloadBibtex">ð BibTeX (.bib)</button> 250 <button class="btn" id="downloadRis">ðï¸ RIS (.ris)</button> 251 <button class="btn" id="downloadCslJson">ð§¾ CSL-JSON (.json)</button> 252 </div> 253 <div style="text-align: center;"> 254 <button class="btn btn-secondary" id="resetBtn">ð Process Another PDF</button> 255 </div> 256 </div> 257 </section> 258 259 <!-- What Gets Extracted --> 260 <section style="margin-bottom: 3rem;"> 261 <h2 style="text-align: center; font-size: 1.75rem; margin-bottom: 2rem; color: var(--text);">What Gets Extracted Automatically</h2> 262 <div class="tools-grid"> 263 <article class="tool-card"> 264 <div class="tool-icon">ð</div> 265 <h3 class="tool-title">Bibliographic Metadata</h3> 266 <ul style="color: var(--text-light); font-size: .95rem; line-height: 1.8; list-style-position: inside;"> 267 <li>Document title</li> 268 <li>Author names</li> 269 <li>Publication year</li> 270 <li>Abstract text</li> 271 <li>Keywords</li> 272 <li>Page count</li> 273 </ul> 274 </article> 275 276 <article class="tool-card"> 277 <div class="tool-icon">ð</div> 278 <h3 class="tool-title">Identifiers & Links</h3> 279 <ul style="color: var(--text-light); font-size: .95rem; line-height: 1.8; list-style-position: inside;"> 280 <li>DOI (Digital Object Identifier)</li> 281 <li>URLs from references</li> 282 <li>ISBN numbers</li> 283 <li>arXiv IDs (old and new style)</li> 284 <li>PubMed IDs</li> 285 </ul> 286 </article> 287 288 <article class="tool-card"> 289 <div class="tool-icon">ð</div> 290 <h3 class="tool-title">Citations & References</h3> 291 <ul style="color: var(--text-light); font-size: .95rem; line-height: 1.8; list-style-position: inside;"> 292 <li>Full bibliography list</li> 293 <li>Citation parsing</li> 294 <li>Reference year detection</li> 295 <li>
295DOI extraction per citation</li> 296 <li>RIS, BibTeX and CSL-JSON export</li> 297 <li>Raw text preservation</li> 298 </ul> 299 </article> 300 </div> 301 </section> 302 303 <!-- Export Formats Section --> 304 <section style="margin-bottom: 3rem;"> 305 <h2 style="text-align: center; font-size: 1.75rem; margin-bottom: 1rem; color: var(--text);">Multiple Export Formats</h2> 306 <p style="text-align: center; color: var(--text-light); margin-bottom: 2rem; max-width: 800px; margin-left: auto; margin-right: auto;"> 307 Transform your PDF data into any format you need - all processed locally in your browser 308 </p> 309 <div style="display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; max-width: 900px; margin: 0 auto;"> 310 <div style="text-align: center; padding: 1.5rem; background: var(--bg-secondary); border-radius: 0.5rem;"> 311 <div style="font-size: 2.5rem; margin-bottom: 0.5rem;">ð</div> 312 <h3 style="font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem;">JSON</h3> 313 <p style="font-size: 0.85rem; color: var(--text-light);">Structured data with all metadata & citations</p> 314 </div> 315 <div style="text-align: center; padding: 1.5rem; background: var(--bg-secondary); border-radius: 0.5rem;"> 316 <div style="font-size: 2.5rem; margin-bottom: 0.5rem;">ð</div> 317 <h3 style="font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem;">Plain Text</h3> 318 <p style="font-size: 0.85rem; color: var(--text-light);">Clean UTF-8 text file (.txt)</p> 319 </div> 320 <div style="text-align: center; padding: 1.5rem; background: var(--bg-secondary); border-radius: 0.5rem;"> 321 <div style="font-size: 2.5rem; margin-bottom: 0.5rem;">ð</div> 322 <h3 style="font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem;">Word</h3> 323 <p style="font-size: 0.85rem; color: var(--text-light);">Formatted DOCX document</p> 324 </div> 325 <div style="text-align: center; padding: 1.5rem; background: var(--bg-secondary); border-radius: 0.5rem;"> 326 <div style="font-size: 2.5rem; margin-bottom: 0.5rem;">ð</div> 327 <h3 style="font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem;">Markdown</h3> 328 <p style="font-size: 0.85rem; color: var(--text-light);">GitHub-flavored Markdown (.md)</p> 329 </div> 330 <div style="text-align: center; padding: 1.5rem; background: var(--bg-secondary); border-radius: 0.5rem;"> 331 <div style="font-size: 2.5rem; margin-bottom: 0.5rem;">ð</div> 332 <h3 style="font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem;"><a href="/formats/bibtex" style="color:inherit">BibTeX</a></h3> 333 <p style="font-size: 0.85rem; color: var(--text-light);">Citation format for LaTeX (.bib)</p> 334 </div> 335 <div style="text-align: center; padding: 1.5rem; background: var(--bg-secondary); border-radius: 0.5rem;"> 336 <div style="font-size: 2.5rem; margin-bottom: 0.5rem;">ðï¸</div> 337 <h3 style="font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem;"><a href="/formats/ris" style="color:inherit">RIS</a></h3> 338 <p style="font-size: 0.85rem; color: var(--text-light);">For EndNote, Zotero, Mendeley (.ris)</p> 339 </div> 340 <div style="text-align: center; padding: 1.5rem; background: var(--bg-secondary); border-radius: 0.5rem;"> 341 <div style="font-size: 2.5rem; margin-bottom: 0.5rem;">ð§¾</div> 342 <h3 style="font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem;"><a href="/formats/csl-json" style="color:inherit">CSL-JSON</a></h3> 343 <p style="font-size: 0.85rem; color: var(--text-light);">For Pandoc and CSL processors</p> 344 </div> 345 </div> 346 </section> 347 </main> 348 349 <!-- Features Section --> 350 <section class="features"> 351 <div class="container"> 352 <h2>Why Choose Browser-First PDF Tools?</h2> 353 <div class="feature-grid"> 354 <div class="feature-item"> 355 <div class="feature-icon">ð</div> 356 <h3 class="feature-title">100% Private</h3> 357 <p class="feature-desc">Your PDFs never leave your computer. All processing happens locally in your browser.</p> 358 </div> 359 360 <div class="feature-item"> 361 <div class="feature-icon">â¡</div> 362 <h3 class="feature-title">Lightning Fast</h3> 363 <p class="feature-desc">No upload and no server queue. PDF.js parses the file in a web worker on your own machine.</p> 364 </div> 365 366 <div class="feature-item"> 367 <div class="feature-icon">ð¡</div> 368 <h3 class="feature-title">Works Offline</h3> 369 <p class="feature-desc">After the first visit the app shell and libraries are cached, so the extractor keeps working without a connection.</p> 370 </div> 371 372 <div class="feature-item"> 373 <div class="feature-icon">ð</div> 374 <h3 class="feature-title">Free to Use</h3> 375 <p class="feature-desc">No sign-up, no API limits, no upload quotas. Built on the open-source PDF.js library.</p> 376 </div> 377 </div> 378 </div> 379 </section> 380 381 <!-- Learn More / Content Hub --> 382 <section class="container" style="margin-top:3rem;"> 383 <h2 style="text-align:center;font-size:1.75rem;margin-bottom:.5rem;color:var(--text);">Learn more about PDF extraction</h2> 384 <p style="text-align:center;color:var(--text-light);margin:0 auto 2rem;max-width:720px;">Practical guides on how PDF metadata is structured, how citation parsers actually work, and how to turn extracted records into a clean bibliography.</p> 385 <div class="tools-grid"> 386 <article class="tool-card"> 387 <div class="tool-icon">ð§</div> 388 <h3 class="tool-title"><a href="/guides/pdf-metadata-extraction" style="color:inherit;text-decoration:none;">PDF metadata extraction</a></h3> 389 <p class="tool-desc">Where metadata lives inside a PDF, how heuristic extractors find titles and authors, and the failure modes worth knowing about.</p> 390 </article> 391 <article class="tool-card"> 392 <div class="tool-icon">ð</div> 393 <h3 class="tool-title"><a href="/guides/citation-parsing" style="color:inherit;text-decoration:none;">Citation parsing</a></h3> 394 <p class="tool-desc">How a parser splits a references section, labels each field, and keeps its hands off the ambiguous bits.</p> 395 </article> 396 <article class="tool-card"> 397 <div class="tool-icon">ð</div> 398 <h3 class="tool-title"><a href="/guides/doi-and-identifiers" style="color:inherit;text-decoration:none;">DOIs and identifiers</a></h3> 399 <p class="tool-desc">The persistent identifiers that make a citation resolvable â DOI, ArXiv, PubMed, ORCID, ISBN, ISSN.</p> 400 </article> 401 <article class="tool-card"> 402 <div class="tool-icon">ð¨ï¸</div> 403 <h3 class="tool-title"><a href="/guides/scanned-pdf-and-ocr" style="color:inherit;text-decoration:none;">Scanned PDFs and OCR</a></h3> 404 <p class="tool-desc">What to do when a PDF has no text layer: tools, accuracy expectations, and privacy considerations.</p> 405 </article> 406 <article class="tool-card"> 407 <div class="tool-icon">ð§©</div> 408 <h3 class="tool-title"><a href="/guides/client-side-pdf-processing" style="color:inherit;text-decoration:none;">Browser-side processing</a></h3> 409 <p class="tool-desc">The architectural choices behind a privacy-first PDF extractor, from PDF.js to service workers.</p> 410 </article> 411 <article class="tool-card"> 412 <div class="tool-icon">ð§ </div> 413 <h3 class="tool-title"><a href="/guides/what-is-grobid" style="color:inherit;text-decoration:none;">What is GROBID?</a></h3> 414 <p class="tool-desc">An independent overview of the open-source GROBID library: what it extracts, the TEI XML output, and where it is used.</p> 415 </article> 416 <article class="tool-card"> 417 <div class="tool-icon">ð³</div> 418 <h3 class="tool-title"><a href="/guides/grobid-docker-and-api" style="color:inherit;text-decoration:none;">Run GROBID with Docker</a></h3> 419 <p class="tool-desc">Start a local GROBID server, call the REST API with curl, and batch-process PDFs with the Python client.</p> 420 </article> 421 <article class="tool-card"> 422 <div class="tool-icon">âï¸</div> 423 <h3 class="tool-title"><a href="/guides/grobid-alternatives" style="color:inherit;text-decoration:none;">GROBID alternatives</a></h3> 424 <p class="tool-desc">CERMINE, AnyStyle, Nougat, Docling, Marker and browser tools compared for metadata and reference extraction.</p> 425 </article> 426 <article class="tool-card"> 427 <div class="tool-icon">ð</div> 428 <h3 class="tool-title"><a href="/guides/arxiv-identifiers" style="color:inherit;text-decoration:none;">arXiv identifiers</a></h3> 429 <p class="tool-desc">What an arXiv ID is, the old and new formats, versions, and how arXiv IDs relate to DOIs.<
429/p> 430 </article> 431 <article class="tool-card"> 432 <div class="tool-icon">ð</div> 433 <h3 class="tool-title"><a href="/guides/find-doi-of-a-pdf" style="color:inherit;text-decoration:none;">Find the DOI of a PDF</a></h3> 434 <p class="tool-desc">Where a DOI hides in a paper, and how to look one up from the title when the PDF does not print it.</p> 435 </article> 436 <article class="tool-card"> 437 <div class="tool-icon">ð</div> 438 <h3 class="tool-title"><a href="/formats/bibtex-vs-ris" style="color:inherit;text-decoration:none;">BibTeX vs RIS</a></h3> 439 <p class="tool-desc">The practical differences between .bib, .ris, EndNote XML and CSL-JSON, and which to export.</p> 440 </article> 441 <article class="tool-card"> 442 <div class="tool-icon">ðï¸</div> 443 <h3 class="tool-title"><a href="/formats/">Export formats</a></h3> 444 <p class="tool-desc">
444Reference pages for BibTeX, RIS, CSL-JSON, Markdown, and DOCX, with notes on when to pick each.</p> 445 </article> 446 </div> 447 </section> 448 449 450 <!-- FAQ --> 451 <section class="container" style="margin-top:3rem;max-width:860px;"> 452 <h2 style="text-align:center;font-size:1.75rem;margin-bottom:1.5rem;color:var(--text);">Frequently asked questions</h2> 453 <details style="border:1px solid var(--border);border-radius:.5rem;padding:1rem 1.25rem;margin-bottom:.75rem;background:#fff;"> 454 <summary style="font-weight:600;cursor:pointer;">Is this the official GROBID website?</summary> 455 <p style="margin-top:.75rem;color:var(--text-light);">No. GROBID Tools is an independent site. The GROBID library is an open-source project developed on GitHub at github.com/kermitt2/grobid, with documentation at grobid.readthedocs.io. This site offers a separate, lightweight in-browser extractor and guides about GROBID and bibliographic formats.</p> 456 </details> 457 <details style="border:1px solid var(--border);border-radius:.5rem;padding:1rem 1.25rem;margin-bottom:.75rem;background:#fff;"> 458 <summary style="font-weight:600;cursor:pointer;">Does the extractor upload my PDF?</summary> 459 <p style="margin-top:.75rem;color:var(--text-light);">No. The PDF is opened with PDF.js inside your browser and the extracted data is generated locally. The site uses Google Analytics for page-level visit statistics, but file names, file contents and extracted text are never sent anywhere.</p> 460 </details> 461 <details style="border:1px solid var(--border);border-radius:.5rem;padding:1rem 1.25rem;margin-bottom:.75rem;background:#fff;"> 462 <summary style="font-weight:600;cursor:pointer;">Does this tool use the GROBID machine-learning models?</summary> 463 <p style="margin-top:.75rem;color:var(--text-light);">No. It uses lightweight heuristics (layout, font size and regular expressions) that run in the browser. GROBID itself is a Java service with trained models and gives more accurate, more structured results on large collections. See the guide on running GROBID with Docker.</p> 464 </details> 465 <details style="border:1px solid var(--border);border-radius:.5rem;padding:1rem 1.25rem;margin-bottom:.75rem;background:#fff;"> 466 <summary style="font-weight:600;cursor:pointer;">Which export formats are available?</summary> 467 <p style="margin-top:.75rem;color:var(--text-light);">JSON, plain text, Microsoft Word (.docx), Markdown, BibTeX (.bib), RIS (.ris) and CSL-JSON. Reference strings are exported as found in the PDF, with any DOI, year and URL detected in them, so check them before citing.</p> 468 </details> 469 <details style="border:1px solid var(--border);border-radius:.5rem;padding:1rem 1.25rem;margin-bottom:.75rem;background:#fff;"> 470 <summary style="font-weight:600;cursor:pointer;">Does it work with scanned PDFs?</summary> 471 <p style="margin-top:.75rem;color:var(--text-light);">Only if the PDF already has a text layer. Image-only scans need OCR first; the tool warns you when it finds almost no text.</p> 472 </details> 473 </section> 474 475 <!-- Last reviewed --> 476 <p class="last-reviewed">Last reviewed on October 3, 2026</p> 477 478 <!-- Footer --> 479 <footer> 480 <div class="footer-inner"> 481 <nav class="footer-links" aria-label="Site policies"> 482 <a href="/about">About</a> 483 <a href="/contact">Contact</a> 484 <a href="/privacy">Privacy</a> 485 <a href="/terms">Terms</a> 486 <a href="/cookies">Cookies</a> 487 <a href="/disclaimer">Disclaimer</a> 488 </nav> 489 <p>© 2026 GROBID Tools. Built with PDF.js running in your browser. Independent site, not the official GROBID project.</p> 490 </div> 491 </footer> 492 493 <!-- docx.js (UMD build) for Word export; PDF.js is imported by app.js --> 494
494<script src="https://cdn.jsdelivr.net/npm/[email protected]/build/index.umd.js" defer></script>
494 495 496 <!-- Main Application Script --> 497
497<script type="module" src="/js/app.js?v=2"></script>
497 498 499 <!-- Service Worker Registration --> 500
500<script> 501 if ('serviceWorker' in navigator) { 502 window.addEventListener('load', () => { 503 navigator.serviceWorker.register('/sw.js') 504 .then(reg => console.log('â Service Worker registered')) 505 .catch(err => console.log('â Service Worker registration failed:', err)); 506 }); 507 } 508 </script>
vendor: 1 bytes, line 508
508
509<script type="module" src="https://static.cloudflareinsights.com/beacon.min.js/v31edd6df95cf4e85bb4c19e7a9bdbcba1788362987495" integrity="sha512-iIg7k2xntmwu6/uSb5tpc/hySgZc4eoL31yB29W6tJFo2akwjPWcEqnCEdJvGexCL0KEQwVYv5BlowfhVz26hg==" data-cf-beacon='{"version":"2024.11.0","token":"ff07b682413a49e1bea5aa049f7b54fc","r":1,"spa":2}' crossorigin="anonymous"></script>
509 510</body> 511</html>
Line numbers count LF bytes from the start of the resource, as the search results do. Vendor segments are library code the classifier recognised; they are stored but not indexed. Bytes are shown as Latin1 characters, one per byte.