Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time

Metapolator Build Status

Metapolator will be a web-based parametric font editor, providing a GUI for designing with UFO fonts and Metafont technologies. Metapolator is intended for type designers to design large font families faster, and for typographically sensitive graphic designers to adjust their libre fonts for their exact needs. For example, expanding a single style design into a family of weights and widths, or fine-tuning the weight and width of a font for your exact needs.

Metapolator first provides a typical 'super' interpolation system that works with unlimited numbers of masters and axes, and will load and save normal UFO fonts.

It will go further, into 'metapolation': leveraging parameterization to create new masters. This will work best when glyphs are drawn as separate, overlapping shapes with pairs of points along each edge. This style of digital drawing is commonly practiced, as it helps when drawing shapes resembling strokes of pens.

The original drawn outline can be reconstructed from an inferred central skeleton (ductus) and Hobby splines (from Metafont.) This reconstruction process is flexible, working similarly to the 'nudge' tools of other font editors.

Metapolator will allow designers to use Metafont technology without have to write any Metafont code. But if you'd like that, check out


Metapolator is not yet released, but if you'd like to try it out and are comfortable using development tools, please see our developer installation instructions in

Our user community is actively involved in development through discussions Google+


This project is licensed by the authors under the GNU General Public License v3.0 and your contributions are welcome via Github at


Thanks to the developers, especially Simon Egli for founding the project, Lasse Fister (@graphicore) for technical leadership, Peter Sikking (NL) for Interaction Architecture, and all current and past contributors. See CONTRIBUTORS for a complete list.

Thanks to metaflop for inspiration and prototypo for exploring this territory in another direction with the same ideals!

Thanks to Google for supporting this project with code contributions. However, Metapolator is not an official Google project, and Google provides no support for it.