Markdown Previewer
Write Markdown and see the rendered HTML update live, side by side.
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About the Markdown Previewer
Markdown is a lightweight markup language that maps plain-text symbols to HTML elements: a line starting with # becomes an h1, text wrapped in ** becomes <strong>, a line starting with - becomes a list item, and so on. It was designed so that even the unrendered source text stays readable, which is why it's the default format for README files, GitHub issues, and most static-site blogs. This previewer converts your text to HTML with a small from-scratch parser running entirely client-side and re-renders on every keystroke.
To use it: type or paste Markdown into the left pane and watch the right pane update instantly. It covers headings (# through ###### ), bold (**text**) and italic (*text*), inline code (`code`), links ([label](url)), ordered and unordered lists, and GitHub-style task lists (- [ ] / - [x]). For example, typing **Done:** [x] Ship it as a task item renders a checked, disabled checkbox followed by bold and plain text. When you're finished, export either the raw .md source or the rendered .html fragment.
What Markdown syntax is supported?+−
Headings (# through ######), bold, italic, inline code, links, unordered/ordered lists, and GFM task lists.
Does it support tables or images?+−
Not currently — this previewer focuses on the core CommonMark/GFM syntax listed above. Table and image syntax typed into the box will render as plain text rather than a table or image.
Is the rendered HTML sanitized?+−
Yes, the previewer only ever produces HTML from the specific Markdown constructs it supports — it doesn't pass through arbitrary raw HTML you type, which avoids script injection through the preview pane.
Why did my numbered list restart at 1?+−
Standard Markdown list numbering follows the first number you type and then just increments, regardless of what digits you type after it — so "1. 1. 1." and "1. 2. 3." render identically as 1, 2, 3.
How do I write a task list?+−
Start a list item with "- [ ]" for an unchecked box or "- [x]" for a checked one — this is the GitHub Flavored Markdown task list extension, and it renders as a real disabled checkbox in the preview.
Can I export just the HTML without the surrounding page?+−
Yes — the "Export .html" button downloads only the converted HTML fragment for what you typed, not a full document with head/body tags, so you can paste it into an existing page.