The Markdown Previewer renders GitHub-Flavored Markdown side by side with your source as you type, supporting tables, fenced code blocks, task lists, strikethrough and autolinks. You see exactly how a README, an issue comment or a documentation page will look before you publish it, and you can copy the rendered HTML when you need the output rather than the source markup.

It is built for developers writing repository documentation, technical writers drafting articles, and anyone who edits Markdown regularly but wants a faithful preview without opening a heavyweight editor or pushing a commit just to check formatting. Catching a broken table or an unclosed code fence in the live preview saves a round trip to the remote and keeps your documents clean.

Because rendering happens entirely in the browser, your notes and documentation never leave your machine and nothing is uploaded. There is no install and no login, so it works equally well for a quick formatting check or a long writing session on private, internal material that you would rather not paste into an online service.