Markdown is a lightweight markup language that uses plain text formatting syntax. Created by John Gruber, it is designed to be easy to read and write in its source form while converting cleanly to HTML. It is widely used for README files, documentation, forum posts, and static site content.
The preview supports GitHub-Flavored Markdown (GFM): headings, bold/italic, links, images, ordered/unordered lists, code blocks with syntax highlighting, tables, blockquotes, task lists, strikethrough, and horizontal rules. The rendering is powered by the marked.js library.
Yes. All rendering happens client-side in your browser using the marked.js library. Your Markdown text is never sent to any server. The preview renders locally and instantly.