MarkSide

MarkSide is a two-column Markdown editor for macOS.

That displays the Markdown source code and the formatted document side-by-side, allowing direct editing on both sides. Moving the cursor simultaneously displays the corresponding position on the other side, facilitating simultaneous checking of syntax and readability. Editing only modifies the actual input content, preserving the original line breaks, character encoding, indentation, and writing conventions such as using asterisks or underscores for italics, without rewriting other parts of the document. MarkSide The software provides formatting tools for bold, italics, links, headings, lists, task lists, quotations, code blocks, and tables, and also supports Markdown shortcuts. It can recognize extensions used in the document and display compatibility for dialects such as CommonMark, GitHub, Pandoc, MultiMarkdown, and Obsidian; when pasting content from Word, a browser, or an AI chat window, it can convert it to Markdown, prompting for confirmation if information loss is possible. YAML front matter, footnotes, and comments are presented as editable cards. Pro features include exporting to PDF, HTML, DOCX, RTF, and RTFD, printing, batch conversion of files or folders, and customizable keyboard shortcuts; batch processing preserves the original files and alerts users of potentially lost content before conversion. MarkSide supports Apple chips and Intel Macs, requires at least macOS 14, offers a multilingual interface, and requires no account, cloud service, or tracking.