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Mofumi PDF

Edit Bookmarks

Add, rename, nest, reorder or delete PDF bookmarks (the outline shown in the sidebar of PDF readers).

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About this tool

Bookmarks make long PDFs easy to navigate: readers show them as a clickable table of contents in the sidebar. This editor loads the bookmarks a file already has and lets you change them freely.

Add a bookmark, give it a title and the page it should open, then use indent and outdent to build chapters and sub-sections. Move items up or down — children move with their parent. The thumbnail shows the target page so you can check you picked the right one.

Your changes are written into the PDF's outline structure, compatible with Adobe Acrobat, browsers and mobile readers. Page content is not touched.

Engines: pdf-lib

How to use

  1. 1

    Open your PDF — existing bookmarks load automatically.

  2. 2

    Add, rename, nest or reorder bookmarks and set their target pages.

  3. 3

    Click “Save bookmarks” and download.

Use cases

  • Navigate a long report

    Add chapter bookmarks to a 200-page report so readers can jump straight to a section.

  • Fix merged files

    Rename the generic bookmarks created when merging into meaningful titles.

  • E-books and manuals

    Build a nested outline for a manual or textbook.

Frequently asked questions

Can I generate bookmarks automatically?

Yes — Bookmarks Auto-Generator detects headings by font size and creates them for you; you can then fine-tune them here.

Do Thai titles work?

Yes, bookmark titles are stored as Unicode.

How do I remove all bookmarks?

Click “Clear” and save — the outline is removed from the file.

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