日本語English

PDF Bookmarks

Add bookmarks (an outline) to a PDF and save it. Create them one per page, from estimated headings, or by pasting "page: title" lines. Afterwards you can still change levels, titles and pages. The page contents do not change.

On-device・No uploadMobile friendlyWorks offline

Your files and input are processed only inside your browser on this device and are never uploaded to our servers.

Drop a file here

or

PDFs are processed in this browser on your device and never uploaded.Accepts: PDFUp to 300 MB per filePaste (Ctrl+V) also works

How to use

  1. report.pdf4 pages

    Add a PDF

  2. report.pdf2 headings added

    Make or fix bookmarks

  3. report (bookmarked).pdfOpens with the panel

    Save with bookmarks

Open a PDF, make bookmarks and save it again

  1. Drop a PDF or click “Choose file”. Any existing bookmarks appear as a tree of levels.

  2. To create them automatically, choose “One per page”, “Estimate headings” or “Paste to create”. Each one replaces the current bookmarks.

  3. Edit names and page numbers, then add or remove items. Move items up or down with the arrow buttons (or Alt+↑ / Alt+↓). Change levels with the demote and promote buttons.

  4. Choose “Show bookmarks when the file opens”, then click “Create PDF with bookmarks”.

  5. The saved file is read back and its count is checked. Then download it.

What it does

Three ways to create

One per page; estimated headings, which lists candidates from text size; or paste "page: title" lines, where indentation makes levels.

Edit as a tree

Change levels, names and pages in one list. Add, remove and change levels with buttons. Reorder with the buttons, or with Alt+↑ / Alt+↓.

Japanese titles

Titles are written as UTF-16, so Japanese bookmarks display correctly and open in other PDF viewers.

Checked after saving

The saved file is read back, and it is only offered when the bookmarks match what you made.

Contents unchanged

Only the bookmark tree and the “show on open” setting change. Text, images and annotations are not re-rendered or recompressed.

Use cases

  • Add chapter bookmarks to a long report or thesis
  • Add one bookmark per page to a scanned document
  • Turn a table of contents written as text into bookmarks
  • Fix the names or page numbers of existing bookmarks

Supported formats

Input

PDF (.pdf)

Output

PDF (.pdf)

Capability matrix

FeatureSupportNotes
Create one per page, from estimated headings, or from pasted linesSupported—
Read and edit existing bookmarks (names, pages, levels)Supported—
Show the bookmarks panel when the file opensSupported—
Estimate headings in a scanned PDF with no text layerNot supportedNo candidates appear when the PDF has no text. Run OCR first
Guarantee that estimated headings are correctPartialCandidates come from text size only. Some lines that are not headings may appear; untick them
Set the zoom or position a bookmark opens atNot supportedBookmarks only point to a page
Bookmark colour, bold and other stylingNot supportedLost on save. Only names, pages, levels and open/closed state are kept
URL or script bookmarks (JavaScript and similar)Not supportedOnly bookmarks that go to a page are written
Add bookmarks to a password-protected PDFNot supportedRemove the protection first
Digitally signed PDFs (keeping the signature)Not supportedBookmarks can be written, but the signature is invalidated on save

Limits & notes

  • Up to 300 MB and 5,000 pages per file. A file can have up to 10,000 bookmarks, nested up to 33 levels deep.
  • Heading estimate reads the first 500 pages. Paste accepts up to 1,000 lines, and each title up to 200 characters.
  • Encrypted PDFs and password-protected PDFs cannot be opened.
  • Works on a smartphone too, but for PDFs with many bookmarks a desktop browser is easier to edit in.

Privacy & safety

Reading the PDF, making the bookmarks and saving all happen in your browser. Your PDF is never sent to a server.

FAQ

How do I add a table of contents (bookmarks) to a PDF?
Open the PDF and create bookmarks with “One per page”, “Estimate headings” or “Paste to create”. Then fix the names or pages and click “Create PDF with bookmarks”.
Can I edit or delete PDF bookmarks?
Yes. Existing bookmarks appear as a tree. Change names and pages, and remove a row with its delete button. Items under a removed row move up one level.
Can I create PDF bookmarks from headings automatically?
Yes. “Estimate headings” lists candidates based on text size, and you choose which to add. A scanned PDF with no text layer gives no candidates.
Will Japanese bookmarks show as garbled text?
No. Titles are written as UTF-16. The file is read back and only saved when the count and content match.
Does adding bookmarks change the PDF contents?
No. Only the bookmark tree and the “show when the file opens” setting change. Text and images are not re-rendered or recompressed.
Is my PDF uploaded?
No. Everything is processed in your browser and never sent to a server.

Merge PDF

Drop several PDFs, put them in order, and get one PDF. You can also choose which pages to take from each file. Nothing is uploaded — merging happens on your device.

No upload

Split PDF

Pick pages from thumbnails to extract them, or split a PDF by ranges, every N pages or into single pages. Your PDF is processed on your device and never uploaded.

No upload

Rotate PDF

Turn PDF pages that were scanned sideways or upside down, and save the result. You can rotate every page, only the landscape pages, or pages you choose. Contents are not recompressed, so quality stays the same.

No upload

Images to PDF

Drop images, put them in order and get one PDF. Choose page size, orientation and margins; phone photos are rotated correctly. Images are converted on your device and never uploaded.

No upload

Compress PDF

Drop a PDF to cut its size. Only photos and scans are recompressed, so text and graphics stay crisp. Your PDF is processed on your device and never uploaded.

No upload

PDF Editor

Lay text (Japanese included), shapes, arrows, a highlighter, freehand drawing and images on top of a PDF, and fill in its form fields. Text, shapes, highlights and freehand strokes are written as PDF vectors and real text, never as pictures; an added image is embedded as an image. Rewriting the original text and true redaction are not possible.

No upload

Last updated: