Extract PDF Annotations

This is a plugin for Obsidian. It extracts all types of annotations (highlight, underline, squiggle, note, free text, etc.) from PDF files inside and outside the Obsidian Vault. It can be used on single PDF files (see Extract PDF Annotations on single file and Extract PDF Annotations from single file from path in clipboard) or even on a whole directory containing PDFs (see Extract PDF Annotations) for batch extraction.

Features

• Extract PDF Annotations Works when editing a markdown note. Searches all PDF files in current Folder for annotations, and inserts them at the current position of the open note.
• Extract PDF Annotations on single file Works while displaying a PDF file inside the Obsidian PDF-Viewer. Extracts annotations from this file and writes them to the note Annotations for <filename>
• Extract PDF Annotations from single file from path in clipboard Works when editing a markdown note. Looks for a file path of a PDF in clipboard, extracts annotations from it and inserts them at the current position of the open note. This command can be used for external PDF files, which are not part of the Obsidian Vault. Helpful, if you do not want to copy your PDFs inside your vault.

Plugin Settings

• Desired annotations
  • Select your desired annotation types that should be extracted from the PDF, if it includes other types that you don't need
• Styling settings
  • Template settings for different types of notes: notes from internal or external PDFs and highlights from internal or external PDFs. The distinction between internal and external exists, if one wants to use different links (internal [[]] links vs. external file:// links). The following template variables are available and can be used by following the Handlebars syntax:
    • {{highlightedText}}: 'Highlighted text from PDF',
    • {{folder}}: 'Folder of PDF file',
    • {{file}}: 'Binary content of file',
    • {{filepath}}: 'Path of PDF file',
    • {{pageNumber}}: 'Page number of annotation with reference to PDF pages',
    • {{author}}: 'Author of annotation',
    • {{body}}: 'Body of annotation'
  • Structure settings
    • Use structuring headlines or not, if you only want to display annotations in the specified template
    • Use the first line of the comment as 'Topic' (and sort accordingly), or not
    • Use folder name or PDF-Filename for sorting
• Settings for Extract PDF Annotations on single file
  • Specify the export path for the command
  • Specify the export name for the command
  • Create one note per annotation
  • Specify the export name for each note per annotation

How it works

Extract PDF Annotations

This command visits all PDF files in the current directory and extracts comments and highlights from the PDF files into the open note. It treats the first line of every comment as Topic for grouping the comments.

Assume we have in a folder in our Vault containing PDF files, e.g:

and we have highlighted the Julia Hello World Programm with a note 'Hello World':

In the editor (e.g. _Extract) we run the plugin's command Extract PDF Annotations (Hotkey Ctrl-P for all Commands). This will fetch all annotations in the PDF files in the current folder and sort them by Topic:

As such, you can relate comments for your topics (here 'Hello World') from several PDF files.

Versions

1.9.4 extract from file path on clipboard can handle single quotes

1.9.3 use pdfjs-dist like Obsidian does

1.9.2 add new template attribute for page labels

1.9.1 avoid duplicate tags, when using option to extract tags from annotation body

1.9.0 update packages

1.8.2 remove placeholder text Extracting PDF Comments from... for Extract PDF Annotations

1.8.1 add option to extract tags from annotation body and setting to overwrite existing export note

1.8.0 add option to export each extracted annotation to a separate note

1.7.0 add settings for dynamic export path (next to PDF) and export name

1.6.0 fix bug after pdfjs api change

1.5.0 add setting for export path

1.4.0 add support for squiggle annotations

1.3.2 bugfix for free text, which is now treated in the same way as a note

1.3.1 bugfix for desired annotations setting

1.3.0 add support for free text annotations

1.2.1 improved annotation extraction

1.2.0 added template settings

1.1.0 add new function Extract PDF Annotations from single file from path in clipboard to extract annotations from PDFs outside Obsidian vault

1.0.4 clean up hyphenation https://github.com/munach/obsidian-extract-pdf-annotations/issues/5

1.0.3 updated highlight fetching to use QuadPoints instead of Rectangles

Installation / Build

Fetch repository:

$ git clone https://github.com/munach/obsidian-extract-pdf-annotations.git
$ cd obsidian-extract-pdf-annotations

Install dependencies:

$ npm i

Transpile main.ts:

$ npm run build

Then create the plugin directory and copy the files main.js and manifest.json, e.g.;

$ mkdir ~/MyVault/.obsidian/plugins/obsidian-extract-pdf-annotations
$ cp main.js manifest.json ~/MyVault/.obsidian/plugins/obsidian-extract-pdf-annotations/

Enable the plugin in Obsidan's setting.

Issues / Bugs

[] works only on left-to-right highlights

Credits

This plugin builds on ideas from Alexis Rondeaus Plugin https://github.com/akaalias/obsidian-extract-pdf-highlights, but uses obsidians build-in pdf.js library.

Author

Franz Achermann and Florian Stöckl