Metaflop

Free plan Web

What Metaflop is

Metaflop is a free web application for customizing fonts with Metafont. Its Modulator lets users adjust typeface parameters with sliders or numeric values instead of writing Metafont code. Controls cover dimensions, proportions, shape, optical corrections, and glyphs, with chart and anatomy previews for inspecting a design and its parameters. Metaflop automates repetitive font-generation work in the background. Each change is processed on Metaflop’s server, which returns a webfont for the preview; preview speed depends on server activity and the internet connection. Finished fonts can be downloaded as a webfont package or an OpenType PostScript font (OTF). Generated outline fonts use the SIL Open Font License v1.1, which permits commercial use and requires derivatives to keep that license. The Metafonts collection lists Adjuster, Bespoke, Fetamont, and Funtauna. Adjuster uses a strict grid, has no curves, and provides 256 T1-encoded characters supporting many European languages written in Latin script. Drafts are not saved online, though a share URL can restore one later.

Who it suits

Metaflop may suit people who want to customize font parameters in a browser without writing Metafont code. It is also useful for those who need downloadable webfont packages or OTF files under the stated font license.

What it does well

Free web application
Adjust parameters with sliders or numeric values
Exports webfont packages and OTF fonts
Generated outline fonts use SIL Open Font License v1.1

What to know first

Drafts are not saved online
Metafont files cannot be downloaded
Preview speed depends on server activity and internet connection
Preview is unsupported in older browsers

Limits

Metaflop does not save drafts online, so restoration requires keeping the share URL. It does not export Metafont files, and older browsers do not support its webfont-based preview.

Getting started

Open the Metaflop website
Choose a Metafont such as Adjuster, Bespoke, Fetamont, or Funtauna
Adjust parameters with sliders or numeric values
Use the anatomy or chart preview
Copy the share URL if you want to restore the draft later
Download the result as a webfont package or OTF

Verdict

Metaflop offers browser-based font customization and two export formats, with no need to write Metafont code. Note the lack of online draft saving and Metafont-file export before relying on it for a workflow.

Questions

Is Metaflop free?

Yes. Metaflop is a free web application with a free plan.

Which platforms does it support?

Metaflop runs on the web.

What can I download?

Generated fonts can be downloaded as a webfont package or an OpenType PostScript font (OTF).

Are generated fonts open source?

Generated outline fonts use the SIL Open Font License 1.1. The project source code and Metafonts use the GNU General Public License v3.0.

Can I save drafts online?

No. You can copy a share URL and reopen it later to restore a draft.

Can I download a Metafont file?

No. Metaflop points to Metafonts source code on GitHub instead.

Facts from Metaflop's own pages

Adjuster character coverage: MF Adjuster has 256 T1-encoded characters supporting many European languages written in Latin script. · metaflop.com, 9 Oct 2026
Adjuster design: MF Adjuster follows a strict grid, uses no curves, and offers a reduced set of parameters. · metaflop.com, 9 Oct 2026
Automated generation: Metaflop automates repetitive font-generation tasks in the background. · metaflop.com, 9 Oct 2026
Browser support: The webfont-based preview is not supported in older browsers. · metaflop.com, 10 Oct 2026
Download limit: Metaflop does not support downloading a Metafont file; it points users to the Metafonts’ source code on GitHub. · metaflop.com, 10 Oct 2026
Downloads: Generated fonts can be downloaded as a webfont package or an OpenType PostScript font (OTF). · metaflop.com, 10 Oct 2026
Draft sharing: Drafts cannot be saved online, but users can copy a share URL and reopen it later to restore a draft. · metaflop.com, 10 Oct 2026
Font generation: The Modulator automates repetitive tasks while users adjust typeface parameters. · metaflop.com, 10 Oct 2026
Font library: The site offers the Adjuster, Bespoke, Fetamont, and Funtauna Metafonts. · metaflop.com, 10 Oct 2026
Font licensing: Generated outline fonts are licensed under the SIL Open Font License v1.1, which the FAQ says allows free download. · metaflop.com, 9 Oct 2026
Licensing: Generated outline fonts use the SIL Open Font License 1.1, which permits commercial use and requires derivative works to remain under the same license. · metaflop.com, 10 Oct 2026
Makers: Alexis Reigel is a co-founder and developer, and Marco Müller is a co-founder and designer. · metaflop.com, 10 Oct 2026
Modulator controls: The Modulator includes controls for dimensions, proportions, shape, optical corrections, glyphs, and a chart preview. · metaflop.com, 10 Oct 2026
Parameter preview: The anatomy preview provides an overview of specific font parameters. · metaflop.com, 10 Oct 2026
Performance: Font parameter changes are calculated on the server, and preview speed depends on server activity and the internet connection. · metaflop.com, 10 Oct 2026
Preview processing: Each parameter change is calculated on Metaflop's server, which returns a webfont used to render the preview. · metaflop.com, 9 Oct 2026
Project license: The project source code and Metafonts use the GNU General Public License v3.0, which allows commercial use subject to its source-sharing terms. · metaflop.com, 10 Oct 2026
Purpose: Metaflop is a web application for customizing fonts with Metafont by adjusting sliders or numeric parameters. · metaflop.com, 10 Oct 2026
Saving drafts: Metaflop does not support saving drafts online; users can restore a draft by saving and reopening its share URL. · metaflop.com, 9 Oct 2026
Source licensing: The project source code and Metafonts use the GNU General Public License v3.0, which allows commercial use under its terms. · metaflop.com, 9 Oct 2026
Support: For parameter guidance, the FAQ recommends enabling the Modulator's anatomy preview to see an overview of specific font parameters. · metaflop.com, 9 Oct 2026
Team: The About page identifies Alexis Reigel and Marco Müller as Metaflop co-founders. · metaflop.com, 9 Oct 2026
Unsupported export: The FAQ says Metaflop does not support downloading a Metafont file, though source code for its Metafonts is available on GitHub. · metaflop.com, 9 Oct 2026
Visual controls: The Modulator lets users change font parameters with sliders or numeric values without writing Metafont code. · metaflop.com, 9 Oct 2026

Where Metaflop stands on Freedom251

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