What is Markdown?

Markdown is a lightweight plain-text syntax for headings, emphasis, lists, links, quotes, code, and other document structure.

Markdown preview and safety

The preview parser disables raw HTML. Its output is then passed through a strict sanitizer that excludes scripts, forms, frames, images, embeds, event attributes, and unsafe URL schemes.

Tables and code blocks

Pipe tables provide compact structured data, while fenced blocks preserve code spacing. The preview never runs code or loads remote media.

Frequently asked questions

Can Markdown contain HTML?

Some processors allow it, but raw HTML is deliberately disabled here.

Is the document uploaded?

No. Parsing, sanitization, insights, copying, and download remain local.