A markdown previewer is a tool that converts Markdown text into formatted HTML and shows the result instantly as you type. Markdown is a plain-text writing format that uses simple marks like # for headings and ** for bold, and a previewer turns those marks into the styled page they describe. The tool below does this entirely in your browser, so you can see exactly how your Markdown will look before you publish it.
What Markdown Is
Markdown is a lightweight markup language for writing formatted text using plain characters. Instead of clicking buttons, you type small symbols that stand for formatting: a hash for a heading, asterisks for bold or italic, a dash for a list item, and backticks for code. The text stays readable on its own, and a converter translates it into HTML when you need a web page. Because the source is plain text, it works in any editor, fits cleanly in version control, and stays portable across tools.
How to Use the Markdown Previewer
- Type or paste your Markdown into the text box.
- Watch the Preview update as you type to see the rendered result.
- Switch the view to HTML source to read or copy the generated HTML.
- Adjust your Markdown and the output changes immediately; there is no button to press.
- Copy the HTML when it looks right, or keep the Markdown for a system that accepts it directly.
The Core Markdown Syntax
| Element | Markdown you type | Result |
|---|---|---|
| Heading | # Title | A large heading (levels 1 to 6 with more hashes) |
| Bold | **text** | text |
| Italic | *text* | text |
| Link | [label](https://url) | A clickable link reading label |
| List | - item | A bulleted list item |
| Code | `code` | Inline monospaced code |
| Quote | > quoted | An indented block quote |
Where Markdown Is Used
Markdown shows up wherever people write text that needs light formatting without a full editor. GitHub and other code hosts render README files and issues from Markdown. Documentation sites and static site generators build pages from Markdown source. Chat and note tools such as Slack, Discord, and many wikis accept Markdown so a few symbols become bold text, lists, and links. Learning the syntax once lets you write the same way across all of these.
When to Use a Markdown Previewer
Use a previewer whenever you write Markdown for a destination you cannot see while editing, such as a README, a documentation page, or a comment that renders elsewhere. The preview confirms that your headings nest correctly, your lists break where you expect, and your links point where they should before you commit or publish. The HTML source view is useful when you need the markup itself, for example to paste into a page that accepts HTML rather than Markdown.
Privacy
The conversion happens entirely on your device. Your Markdown is processed in the browser and is never uploaded, logged, or stored on any server, so you can paste private notes or unreleased documentation without it leaving your machine. You can confirm this by disconnecting from the internet and watching the preview still update.
Last Thoughts on Previewing Markdown
Markdown keeps writing fast and the source readable, but the formatting only becomes visible once something renders it. A previewer closes that gap by showing the finished page as you write, so you catch a broken list or a mistyped link before anyone else sees it. The plain-text source stays the single thing you edit, and the HTML is generated on demand whenever a system needs it.
Write your next README or documentation page here and switch between Preview and HTML source as you go. When you are done, explore the rest of our free online tools, including the HTML encoder and decoder, the word counter, and the text case converter.
Key Takeaways:
- Markdown is plain text with simple symbols that a converter turns into formatted HTML.
- This previewer renders your Markdown to HTML in real time and offers a Preview view and an HTML source view.
- The tool escapes raw text first, so pasted HTML or scripts are shown as characters and never run.
- The core syntax covers headings, bold, italic, links, lists, inline and fenced code, quotes, and horizontal rules.
- Markdown is used on GitHub, in documentation, and in chat and note tools, so the same syntax works in many places.
- Everything runs in your browser; nothing you type is sent anywhere.
Frequently Asked Questions (FAQs)
What is a markdown previewer?
A markdown previewer is a tool that converts Markdown text into formatted HTML and shows the rendered result as you type. It lets you confirm how headings, lists, links, and other formatting will look before you publish the text to a README, documentation page, or any place that renders Markdown.
Does this markdown preview tool send my text anywhere?
No. The conversion runs entirely inside your browser, and your Markdown is never uploaded, logged, or stored on any server. You can paste private notes safely, and the preview keeps working even if you disconnect from the internet.
Is it safe to preview Markdown that contains HTML?
Yes. The tool escapes the raw text before it applies any formatting, so HTML tags and scripts in your input are shown as visible characters rather than executed. This means you can preview Markdown from an untrusted source without it affecting the page.
Which Markdown features does this tool support?
It supports headings from level one to six, bold and italic text, inline code, fenced code blocks, links, unordered and ordered lists, block quotes, horizontal rules, and paragraphs with line breaks. This covers the common syntax used in most READMEs and documentation.
How do I get the HTML out of my Markdown?
Switch the view from Preview to HTML source. The tool then shows the generated HTML as plain, escaped text in a read-only box, which you can select and copy into any page or system that accepts HTML.
What is Markdown used for?
Markdown is used to write formatted text in plain characters. It is common on GitHub for README files and issues, on documentation sites and static site generators, and in chat and note tools such as Slack, Discord, and many wikis, where simple symbols become bold text, lists, and links.
