Tiny Online Tools
Why Edit a PDF's Outline?
A PDF's outline (also called bookmarks or table of contents) is the navigation tree shown in the sidebar of every reader. Good outlines turn a 400-page manual from a linear slog into a navigable document; missing outlines make even short PDFs harder to use. The PDF Outline Editor gives you a quick, client-side way to write or replace that outline without opening a heavy desktop editor.
Input Format
One entry per line. Each line is Title|pageNumber. Indent with two spaces to nest an entry under the previous one:
Introduction|1
Chapter 1|4
Overview|4
Details|7
Chapter 2|12
Part A|12
Part B|18
Appendix|40
The tool writes a proper /Outlines dictionary with the correct First, Last, Next, Prev, Parent, and Count pointers, and destinations that open each target page at its top-left corner.
Common Uses
- Add bookmarks to scanned contracts or reports
- Replace an auto-generated outline with a cleaner, hand-curated one
- Add quick navigation to engineering handbooks and user manuals
- Restore lost bookmarks after PDF merging or conversion
Compatibility
Works with any standard PDF 1.4+ file. Result opens cleanly in Adobe Acrobat Reader, macOS Preview, Chrome's built-in viewer, and most mobile PDF readers. Existing annotations and form fields are preserved.
Privacy
The tool runs entirely in your browser using pdf-lib. Your file is never uploaded. Your outline text is never logged.