PDFOutliner
PDFOutliner is a Mac utility for adding, building, and editing table-of-contents navigation inside PDF files.
What is PDFOutliner?
PDFOutliner is a native macOS utility for creating and editing a PDF’s embedded table of contents so readers can navigate long documents more easily. It is designed for people who work with reports, books, manuals, scanned documents, and other multi-page PDFs that need clear sidebar navigation in apps such as Preview and other PDF readers. The app can build a table of contents by analyzing heading fonts in text-based PDFs, and it also supports workflows for scanned or OCR-based files. Users can clean up an existing outline, create one from scratch, and refine entry names for better readability on desktop and mobile devices. PDFOutliner writes the outline back into the PDF itself, which makes the result portable across compatible PDF viewing apps. It is published by One Kerato and is focused on practical PDF organization rather than full document editing.
Key features
- Build a PDF table of contents by analyzing heading fonts in the document
- Create a table of contents for scanned or OCR-based PDFs
- Edit and clean up existing outline entries inside a PDF
- Save and reuse font-set mappings for recurring document layouts
- Rename entries and add prefixes or suffixes to multiple outline items
- Write the completed table of contents back into the PDF for use in other viewers
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Safety overview
Status: Safe
PDFOutliner works on documents you open and edit, so access to your PDF files is normal for its purpose. Its main effect is to modify the table-of-contents structure stored inside a PDF, which can change how the document is navigated in compatible readers. If a PDF is important, keep a backup copy before making large outline edits so you can compare or restore the original if needed.
Recommendation: Keep PDFOutliner if you use it to organize long PDFs, add navigation to exported documents, or improve scanned-document usability. If you no longer edit PDF outlines, you can remove the app without affecting macOS, though any workflow built around its outline-editing tools will no longer be available.
Common paths
/Applications/PDFOutliner.app
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