GitHub Flavored Markdown previewer

GitHub Flavored Markdown (GFM) adds features to plain Markdown — task lists, tables, code blocks and alert callouts — and it is worth checking how a document will render before you commit it. This previewer shows GFM live as you type, and adds writing metrics: word and character counts, line counts and an estimated reading time.

Previewing catches the formatting problems that only appear when rendered — a broken table, a task list that is not quite right, a code fence with the wrong language. The metrics are handy for READMEs, issues and documentation where length and reading time matter.

It runs in your browser, so your content is not uploaded. Use it to draft and check GitHub content, or as a general GFM editor with instant feedback.