clientpdf/split-by-bookmarks.html at main · abyworkings-coder/clientpdf · GitHub

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  <section class="hero">
    <h1>Open DevTools.<br />Split by bookmark.<br />Watch nothing get sent anywhere.</h1>
    <p class="lede">
      Drop a PDF that already has bookmarks — chapters, sections, whatever
      it was exported with — and this reads that existing outline to work
      out where each section starts and ends, then extracts any of them as
      its own PDF. Entirely inside this tab. Zero network requests after
      the page loads, same rule as every other tool here. Check the
      Network tab yourself.
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        <p class="dropzone-hint">One file at a time · stays on this device</p>
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        <h3>No accounts</h3>
        <p>No signup, no email, no watermark. Use it and close the tab.</p>
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      <div class="proof-item">
        <h3>Reads real bookmarks</h3>
        <p>Direct <code>/Dest</code> entries and <code>/A</code> GoTo actions both work — covers PDFs from Word, LibreOffice, and pdf-lib alike.</p>
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        <h2>Need to add bookmarks first? Also live.</h2>
        <p><a href="./bookmarks.html">Add bookmarks</a> to a PDF, or use the plain <a href="./split.html">page-range split</a> if your file has no outline yet. Leave your email and we'll let you know about a Pro batch mode.</p>
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<section class="about">
  <h2>Splitting by structure instead of by page number</h2>
  <p>Split by Bookmarks reads a PDF's <em>existing</em> outline — rather than writing one, the way <a href="./bookmarks.html">Add Bookmarks</a> does — walking the <code>/Outlines</code> linked list and resolving each entry's target page through either a direct <code>/Dest</code> array or an <code>/A</code> GoTo action's <code>/D</code> array, which covers PDFs exported from Word or LibreOffice as well as ones built with pdf-lib. Each bookmarked section is then extracted as its own file, running from one bookmark to the next (or to the end of the document).</p>
  <p>This only works if the source PDF has bookmarks to read in the first place. If you merged several files and the combined document came out with no outline at all, <a href="./guide-merge-bookmarks.html">here's why merging drops bookmarks by default, and how to rebuild them with Add Bookmarks first</a> — then this tool has something to split on.</p>
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