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Formiko

Formiko is a Markdown editor, available on Linux: Markdown support and syntax highlighting.

  • Completely free
  • Linux
  • Open source

Overview

Formiko is a Markdown editor, available on Linux.

Features described in its Flathub listing and on its official website: Markdown support and syntax highlighting.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “reStructuredText and Markdown editor” — Flathub, 10 November 2026
  • “reStructuredText and Markdown editor” — Flathub, 10 November 2026
  • “GtkSourceView based editor with syntax highlighting” — Flathub, 10 November 2026

At a glance

Formiko is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (BSD-3-Clause) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

  • Open source code
  • Commercial use allowed

About

Formiko is a reStructuredText and Markdown editor and live previewer. It is written in Python with GTK4, libadwaita, GtkSourceView and WebKit. Uses Docutils and m2r2 Markdown parser. Features: GtkSourceView based editor with syntax highlighting Optional Vim editor support Vertical or horizontal window splitting Preview mode with auto scroll Periodic file save JSON and HTML preview Spell check Linked file opening

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Official plan pages (pricing, licence, terms) (commercial use) —
  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Last technical check: 8 November 2026
  • Description from Flathub — AppStream (Flathub)

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