Auto-detect chapter headings in your PDF and generate a clean, clickable Table of Contents page plus a real bookmarks panel. Perfect for e-books, theses, technical reports and any long PDF that lacks navigation.
Click to select a file or drag and drop
A single PDF file
Your files never leave your device.
Drop a PDF (e-book, thesis, report) onto the upload zone or pick it from your device. The file is processed locally in your browser; nothing is uploaded.
ZentoPDF scans every page for heading-style lines (large font, bold, top of page) and proposes a hierarchical Table of Contents. You can promote, demote, rename or delete entries before generating.
Click generate to insert a real clickable Table of Contents page at the beginning of the PDF and to populate the bookmarks panel that PDF viewers display on the left.
Add, edit, import, delete and extract PDF bookmarks.
Insert page numbers into your document.
Add text to the top and bottom of pages.
Combine multiple PDFs into one file. Preserves Bookmarks.
Duplicate, reorder, and delete pages.
ZentoPDF compares font size, weight and indentation across the whole document. Lines that are noticeably larger or bolder than the surrounding body text are promoted to TOC entries, mirroring the visual heading hierarchy of the source PDF.
The proposed TOC is fully editable before generation: you can rename entries, change their level (H1/H2/H3), delete false positives or add missing entries by clicking the corresponding page. Once you’re happy, click generate to insert the TOC.
Yes. Beside the visible TOC page, ZentoPDF writes a /Outlines tree into the PDF so the bookmarks panel of every PDF reader (Adobe Acrobat, Preview, Chrome, Firefox, Edge) shows the same hierarchical navigation.
No. Both heading detection and PDF rewriting happen locally in your browser. Your manuscript and the bookmarked output never leave your device, which makes the tool safe for unpublished books, research and internal reports.
Yes, 100% free with no signup, no watermark and no daily quota. Generate TOCs for as many PDFs as you like, for personal or professional use.