Markdown is a lightweight markup language that lets you format text using plain-text syntax. It was designed to be easy to read and write, and converts cleanly to HTML for web publishing.

Common syntax includes headers (# H1, ## H2), bold (**text**), italic (*text*), lists (ordered with 1., unordered with - or *), links ([text](url)), images (![alt](url)), fenced code blocks with triple backticks, and tables with pipe-delimited rows.

Markdown is the standard format for README files on GitHub, technical documentation, blog posts (Jekyll, Hugo, Gatsby), changelelogs, forum posts (Reddit, Stack Overflow), and note-taking apps (Notion, Obsidian). This tool runs entirely in your browser — your content never leaves your device.