Pencil: Sketching and Prototyping With Firefox

Pencil in an open source GUI prototyping and sketching tools, based on Mozilla Firefox. You can use it to easily create user interface wireframes / prototypes for your web and software projects. Pencil can be installed as Firefox 3 addon. After being installed, you can launch it through Firefox Tools menu.

If you prefer to run it as a standalone application, you will need to installĀ  XULRunner, which provides Pencil a way to run completely outside Firefox.


  • Built-in stencils for diagramming and prototyping
  • Multi-page document with background page
  • Inter-page linking
  • On-screen text editing with rich-text supports
  • Exporting to HTML, PNG, document, Word document and PDF
  • Undo/redo supports
  • Installing user-defined stencils and templates
  • Standard drawing operations: aligning, z-ordering, scaling, rotating…
  • Cross-platform
  • Adding external objects
  • Personal Collection
  • Clipart Browser

Developed by Evolus; Pencil is free open source tool released under the GPL Version 2. You can find further information, download and documentation on Pencil Project Website.

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