What is Markdown?

Markdown is a lightweight text format for writing formatted documents in plain text. It's the standard for README files, project docs, changelogs, notes, blog drafts, and developer plans. A few simple symbols — # for headings, - for lists, ** for bold — turn ordinary text into a clean, structured document.

How to use this Markdown Previewer

Paste Markdown into the editor or open a local .md, .markdown, or .txt file. The preview updates live as you type. Switch between Split, Editor, and Preview views, jump around with the outline, and copy the rendered HTML or download a clean standalone HTML document or the original Markdown.

What this tool does not do

It does not upload your files, sync them, host your documents, or check external links. Raw HTML is escaped by default for safety; you can opt into a conservative allow-list preview, but scripts, event handlers, and unsafe URLs are always blocked. There is no syntax highlighting in this version — code blocks are styled but not colorized — to keep the tool dependency-free.

Why privacy matters

Markdown docs often contain project details, internal URLs, private notes, or unreleased plans. This preview happens entirely in your browser, so sensitive content never leaves your device. Drafts are only saved to this device if you explicitly turn on auto-save, and you can clear them at any time.