MarkPane

<p><strong>MarkPane</strong> is a native macOS Markdown viewer and editor for local documents. It opens Markdown and plain-text files, lets you browse folders of related documents, renders supported Markdown content in a dedicated viewer, and provides source editing, rendered search, task-list updates, typography controls, and printing.</p> <p>The app is designed for local-first workflows such as notes, README files, technical documentation, project specs, and Markdown folders. Documents are processed locally on the Mac; the app does not require an account and does not upload Markdown content.</p> <h5>Features</h5> <ul> <li>Open <code>.md</code>, <code>.markdown</code>, <code>.mdown</code>, <code>.mkd</code>, and <code>.txt</code> files from Finder, the File menu, or drag and drop.</li> <li>Browse local folders of Markdown files, create new Markdown files and folders, rename items, and move selected files or folders to the macOS Trash after confirmation.</li> <li>Use independent windows, macOS tabs, and local Markdown links that open in MarkPane tabs.</li> <li>Render headings, lists, links, blockquotes, tables, code, images, details sections, footnotes, hard line breaks, and GitHub-style alerts.</li> <li>Open rendered images, tables, and Mermaid diagrams in separate resizable windows.</li> <li>Render Mermaid fenced blocks for flowchart, state, sequence, class, ER, and XY chart diagrams.</li> <li>Render display math with MathJax for <code>$$...$$</code>, <code>\[...\]</code>, and fenced math blocks.</li> <li>Update rendered task-list checkboxes and save matching Markdown markers in the source file.</li> <li>Search rendered document content with next and previous match navigation.</li> <li>Edit Markdown source with autosave, Markdown-aware list and blockquote continuation, task-list continuation, and Tab/Shift-Tab line indentation.</li> <li>Adjust rendered font, font size, line height, document surface, and window transparency.</li> <li>Print from the active viewer or editor window.</li> </ul>