Markdown Preview is a free, private Markdown editor with a live preview that runs entirely inside your browser. Everything you write stays on your own device in local storage, so there is no account to create, no file to upload to a server, and nothing about your notes ever leaves your machine. It is built for developers, writers, students, and anyone who wants a fast, distraction-free place to draft and format Markdown without juggling a heavyweight desktop app or trusting a cloud service with private drafts.
The editor supports full GitHub Flavored Markdown, including tables, task lists, strikethrough, and autolinks, plus extras like callouts, footnotes, and frontmatter parsing that many lightweight editors skip. For technical writers and researchers, it renders KaTeX math expressions and Mermaid diagrams inline as you type, so equations and flowcharts show up exactly as they will when shared elsewhere. Code blocks get syntax highlighting across more than 180 programming languages, making it a solid home for README files, technical notes, and documentation drafts.
One of the standout features is Present mode, which instantly turns any Markdown document into a slide deck complete with speaker notes, so a set of meeting notes or a technical write-up can double as a presentation with zero extra tooling. You can also open files directly from GitHub or GitLab by pasting a link, which is handy for quickly reviewing or annotating a README without cloning a repository. The app supports multiple tabs, a document outline for quick navigation, automatic snapshots so you never lose work, and custom CSS if you want to tweak how your documents render.
When it is time to share your work, Markdown Preview exports to PDF, HTML, or plain .md files, or lets you copy the rendered content as rich text directly into Gmail, Google Docs, or Slack messages, preserving formatting like headings, bold text, and lists instead of dumping raw Markdown syntax. It is also an installable Progressive Web App, so it can be added to your dock or home screen and used offline, just like a native application, with no internet connection required once it is loaded.
There are no accounts, no subscriptions, no usage limits, and no watermarks. Every feature described above is available for free, with no paid tier to upgrade into. The goal is simply to make Markdown editing fast, private, and pleasant, whether you are jotting a quick note, writing documentation, preparing a presentation, or drafting content that needs to move cleanly into other tools like Docs, Gmail, or Slack. It works well on both desktop and mobile browsers and is actively maintained.
