PDF Bookmark Editor
Read, edit and add the outline bookmarks that make a long PDF navigable.
Give A Long Document A Spine
The panel down the side of a PDF reader — the one listing chapters you can click — is the outline, and a surprising number of long documents ship without one. Merged reports, scanned manuals and exported slide decks nearly always lose whatever structure they had, leaving a two-hundred-page file navigable only by scrolling.
This editor reads any bookmarks already in the file, lets you rewrite and nest them, and can suggest a starting point from the first heading-like line on each page.
Key features
- Reads the existing outline — titles, destinations and nesting come in as they are, ready to edit.
- Real hierarchy — indent an entry to nest it under the one above, the way a table of contents is actually structured.
- Suggests from page text — the first heading-like line on each page, as a starting point rather than a finished answer.
- Destinations survive editing — each bookmark points at a page in the file that is written, not at a page number that might move.
- Opens with the panel showing — the document is saved so readers reveal the outline on open.
This tool runs entirely inside your browser using native Web APIs. Your files and text are never uploaded to a server, never logged and never shared with third parties.
How to use: PDF Bookmark Editor
- Choose the PDF
Any bookmarks it already has are read in and listed. - Add or edit entries
Set a title and a page for each. Use suggestion first if the document has a text layer. - Build the hierarchy
Indent sub-sections under their chapter, and reorder with the arrows. - Save the file
Open the outline panel in your reader to see the result.
Technical specifications
| Processing location | Entirely in your browser — no server round trip |
|---|---|
| Data uploaded | None. Files and text never leave your device |
| Price | Free — no account, no trial, no usage cap |
| Category | |
| Works offline | Yes, once the page has loaded |
| Browser support | Chrome 90+, Edge 90+, Firefox 90+, Safari 15+ |
| Interface languages | English, 中文, हिन्दी, Español, العربية |
Frequently asked questions
Why are the suggested titles wrong?
Suggestion takes the first line on each page that contains real words, which is a heading on a well-structured document and a running header, a page number or a stray caption on everything else. It is a starting point that saves typing, not a substitute for reading; edit the titles before saving.
Nothing was suggested at all — why?
The document has no text layer, which means it is a scan: images of words rather than words. Bookmark titles have to be typed in. Running OCR first would give the file a text layer and make suggestion work.
Do bookmarks change how the document prints?
No. The outline is navigation metadata and has no printed representation. It affects only what a reader shows on screen.
What happens to bookmarks when I merge PDFs?
Most merge tools discard them, which is exactly why this tool exists. Merge first, then add the outline to the combined file — the destinations will then refer to the right pages.
Can a bookmark point somewhere other than the top of a page?
The PDF format allows destinations with a precise position and zoom, but this editor writes whole-page destinations, which is what nearly every reader honours consistently and what a table of contents needs.