Mark - Markdown Viewer

Read Markdown without opening anything. Select a .md file in Finder, press Space, and Mark shows it fully rendered, exactly as it would look on GitHub: headings, tables, code, diagrams and math. Your Markdown files even get real thumbnails, so you can recognize them at a glance.

When you want to change something, open the file in Mark: a fast, native viewer and editor with a split view and live preview.

PREVIEW WITHOUT OPENING THE APP • Press Space on any Markdown file in Finder for a full rendered preview, no app launch needed • Diagrams, math and syntax-highlighted code render right inside Quick Look • File icons show a miniature of the document instead of a generic text icon • Works in Finder, the Open dialog, Spotlight and anywhere else macOS uses Quick Look • Safe by design: previews block every remote request, so a file can't phone home just because you looked at it

GITHUB-FLAVORED RENDERING • Tables, task lists and strikethrough, styled with GitHub's own stylesheet • Syntax highlighting for code blocks, with light and dark themes • Mermaid diagrams: flowcharts, sequence diagrams, Gantt charts and more • Math with KaTeX: inline and display equations, rendered offline

WRITE THE WAY YOU LIKE • Three modes: preview, split view with synced scrolling, and editor (⌘1 / ⌘2 / ⌘3) • A native, Markdown-aware editor with live highlighting • Formatting shortcuts: ⌘B bold, ⌘I italic, ⌘K link, ⇧⌘C inline code • Click a task-list checkbox in the preview and the source updates

FIND YOUR WAY • An outline sidebar built from your headings: click to jump • Find in the preview or in the editor (⌘F) • Live word count and reading time

SHARE AND PRINT • Export to PDF or standalone HTML • Print with the rendered styling

PRIVATE BY DESIGN • No accounts, no analytics, no tracking • Everything renders locally and works fully offline • All HTML is sanitized before it is displayed

Light, dark or system appearance.

Discovery signals