Explainer1 min readUpdated June 29, 2026

What is Markdown?

Short answer

Markdown is a lightweight markup language for writing formatted text with plain characters, like # for a heading and ** for bold. It stays readable as plain text and is converted to HTML for display.

Formatting with plain text

Markdown lets you mark up text using characters you already type. A # makes a heading, **text** makes bold, and a - starts a list. The raw file stays perfectly readable, which is what sets it apart from HTML.

# Title

Some **bold** text and a [link](https://utilumo.com).

- first item
- second item

Markdown source

Why it is everywhere

It is fast to write and easy to read in raw form
It converts cleanly to HTML for the web
It is plain text, so it works with version control and any editor
It is the standard for READMEs, docs, issues, and many note apps

Try it: Markdown PreviewWrite Markdown and see the rendered result live, locally in your browser.Open tool

Flavors existCommonMark is a strict specification; GitHub Flavored Markdown adds tables, task lists, and strikethrough. See Markdown vs HTML.

References

Questions

What is a .md file?

A .md file is a plain-text file written in Markdown. Editors and sites render it as formatted HTML, but the file itself is just readable text.

Do I need to learn HTML to use Markdown?

No. Markdown covers the common formatting needs on its own, and you can drop in HTML only for the rare cases Markdown does not handle.

Does this send my data anywhere?

No. Utilumo's developer tools parse and transform input inside the browser tab. Nothing is uploaded, stored, or logged.