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About the developer

8.2K Stars 640 Forks GNU General Public License v2.0 1.5K Commits 465 Opened issues


The Pencil Project's unique mission is to build a free and opensource tool for making diagrams and GUI prototyping that everyone can use.

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About The Next Version

Pencil V3 is a rewrite of Pencil that aims to fix major performance and scalability issues of the application. The new version is under heavy development and we are expecting GA builds in June. The following list summarizes important changes in the new version:

  • Pencil V3 uses Electron instead of Mozilla XULRunner as the runtime. We expect that by moving into this Nodejs-based environment, the Pencil source code can be much easier for all fellow developers to play with. The fact that Mozilla XULRunner is outdated is also a reason for the movement.
  • A new, zip-based file format was introduced to support large documents and better embedding of external bitmaps/resources.
  • A new mechanism for page management that dramatically reduces memory usage for large documents.
  • Document pages can now be structured into a tree-like model.
  • Custom fonts can now be embedded into Pencil .epz documents
  • Printing and PDF export will be improved to support all platforms and with many options
  • New UI approach

Setting up

Pencil uses Atom Electron as the runtime, follow the these steps to setup the environment:

  • Clone this repository
  • Make sure you are using nodejs 5+ (Pencil development only needs npm for package management. Node runtime is not required.)
  • Checkout this development branch:

    $ git checkout development
  • Install dependencies:

      $ npm install
  • Start Pencil using the prebuilt version of Electron

      $ npm start

Supported Platforms


Only OSX 64bit 10.9 and later are supported.


Windows 7 and later are supported, older operating systems are not supported (and do not work).


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