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A Table of Contents for Any PDF

Plenty of PDFs arrive without an outline — scanned reports, exported slides, merged documentation, ebooks that were never tagged. Without bookmarks, the only way to navigate a 200-page document is scrolling and guessing. This tool lets you build a proper clickable outline: a sidebar tree of named entries that jump straight to a page.

If your PDF already has bookmarks, they're loaded into the editor the moment the file opens, so you can rename, retarget, reorder and re-nest them instead of starting from scratch. If it doesn't, you can add entries one by one, paste a whole list at once, or let the tool find the headings for you.

Three Ways to Build an Outline

Write it yourself, import it, or generate it — then refine everything in the same tree editor.

Tune Detection Until It Matches Your Document

Heading detection isn't one-size-fits-all. A sensitivity slider controls how much bigger than body text a line must be to count as a heading — lower it for subtle documents, raise it when captions keep getting picked up. You can also include bold lines, cap the outline depth, and add regular-expression patterns per level, like ^Chapter\s+\d+ for level one or ^\d+\.\d+ for level two.

Detection results land in the same editable tree as everything else, so the workflow is: generate, then fix the handful of entries that need a different title or page. Existing bookmarks, imported lists and detected headings can be mixed freely.

How It Compares

Most ways of getting bookmarks into a PDF involve desktop software or starting the document over.

Your Document Never Leaves Your Device

The PDFs that most need bookmarks — contracts, manuals, theses, internal reports — are often exactly the ones you shouldn't upload to a random website. Most online PDF tools send your file to a server for processing.

OxygenPDF reads, edits and rewrites the PDF entirely in your browser. Nothing is transmitted, and closing the tab wipes the data. Even password-protected files are unlocked locally — the password is used to decrypt the document in memory and goes nowhere.