Markdown Editor & Preview Online
Write Markdown on the left and see a beautifully rendered HTML preview on the right — instantly, as you type. Free, private, and entirely in your browser.
What This Tool Does
Real-Time Live Preview
See your Markdown rendered as formatted HTML the moment you type. There is no delay, no button to press, and no page reload. Every keystroke immediately updates the preview panel on the right so you always know exactly how your document will look. This instant feedback loop makes writing faster and eliminates the guesswork that comes with switching between editing and previewing in separate tools. Whether you are drafting a quick note or composing a lengthy technical article, the live preview keeps you in flow.
Full Markdown Syntax Support
Our built-in parser handles all the core Markdown elements you need for everyday writing. Create headers from level one through level four, make text bold or italic, build both ordered and unordered lists, insert links and images, write inline code and fenced code blocks, add blockquotes for citations, and separate sections with horizontal rules. The parser is written in pure JavaScript with zero external dependencies, which means it loads instantly and runs entirely in your browser without sending data anywhere.
Convenient Toolbar Shortcuts
Speed up your editing with the formatting toolbar at the top of the editor. Click a button to wrap your selected text in the appropriate Markdown syntax, or insert a template at your cursor position when nothing is selected. The toolbar supports bold, italic, three levels of headings, links, images, inline code, fenced code blocks, unordered lists, ordered lists, blockquotes, and horizontal rules. Keyboard shortcuts are also available for bold and italic, letting experienced writers stay on the keyboard without reaching for the mouse.
Copy Markdown or HTML Output
When your document is ready, export it in the format you need with a single click. The Copy MD button places the raw Markdown source text onto your clipboard so you can paste it into GitHub, GitLab, Notion, or any platform that accepts Markdown. The Copy HTML button gives you the rendered HTML markup, which is perfect for pasting into email clients, content management systems, or static website templates. Both actions happen instantly and completely on the client side, so your content stays private.
Quick Start Guide
- Start writing Markdown. Type directly into the editor on the left. Use standard Markdown syntax such as
#for headings,**text**for bold,*text*for italic,[text](url)for links, and```for code blocks. The toolbar buttons can insert these for you automatically. - Watch the live preview. As you type, the right panel updates in real time to show how your Markdown will render as HTML. Scroll through the preview to check formatting, verify links, and ensure your document looks the way you intend.
- Use the toolbar for quick formatting. Select a word or phrase and click a toolbar button to wrap it in the appropriate syntax. If nothing is selected, a placeholder template is inserted at your cursor. Keyboard shortcuts Ctrl+B (bold) and Ctrl+I (italic) are also supported.
- Copy your output. Click Copy MD to copy the raw Markdown source, or Copy HTML to copy the rendered HTML markup. Paste into any platform that accepts your chosen format. Click Clear to reset the editor and start fresh.
GitHub Flavored Markdown (GFM) extensions like task lists (- [ ]), tables, and strikethrough (~~text~~) are not portable across all renderers. If your document will be processed by Pandoc, Hugo, or a non-GFM parser, stick to CommonMark syntax for maximum compatibility.
Using raw HTML inside Markdown without checking if the renderer supports it. Some platforms (Notion, Discord, many CMSs) strip HTML tags entirely, breaking your layout. Always test your target platform before relying on inline HTML for formatting.
Use Cases & Examples
Open-Source Maintainer
Yuki writes README files, CONTRIBUTING guides, and changelogs for her GitHub projects. She previews the rendered output here before committing, ensuring badges, tables, and code blocks display correctly on the repository page.
Technical Writer
Omar drafts API documentation in Markdown that gets compiled to a static docs site with Hugo. He uses the live preview to verify heading hierarchy, link formatting, and code fence syntax before pushing to the docs repository.
Content Marketer
Ines writes blog posts in Markdown for a Gatsby-powered site. She composes drafts in this editor to check formatting, then copies the raw Markdown into her CMS, saving time compared to switching between a word processor and code editor.
Understanding Markdown: A Brief History and Guide
Markdown is a lightweight markup language created by John Gruber in 2004 with significant contributions from Aaron Swartz. Gruber designed it with a clear philosophy: the source text should be readable as plain text without requiring a rendering engine. Unlike HTML, which wraps content in verbose angle-bracket tags, Markdown uses minimal punctuation characters to indicate formatting. A hash symbol becomes a heading, asterisks produce bold or italic text, and hyphens create list items. This simplicity made Markdown an immediate favorite among writers, bloggers, and developers who wanted a faster way to produce structured documents without the overhead of a full word processor or the complexity of raw HTML.
Gruber published the original Markdown syntax specification along with a Perl script that converted Markdown to HTML. The specification was intentionally informal, which gave authors flexibility but also led to inconsistencies as the language gained popularity. Different implementations interpreted edge cases differently, which meant the same Markdown source could render differently depending on which parser processed it. This fragmentation motivated a group of developers, led by Jeff Atwood and John MacFarlane, to launch the CommonMark project in 2014. CommonMark provides a rigorous, unambiguous specification with hundreds of test cases, ensuring that compliant parsers all produce identical output for the same input. Today CommonMark serves as the de facto standard that most modern Markdown tools follow.
GitHub introduced its own extension of Markdown known as GitHub Flavored Markdown, or GFM, which builds on CommonMark and adds features that are especially useful for software development. GFM supports task lists with checkboxes, tables with pipe-delimited columns, strikethrough text with double tildes, autolinked URLs, and syntax-highlighted fenced code blocks. Because GitHub is where millions of developers host their code, GFM has become one of the most widely used Markdown dialects in the world. Platforms such as GitLab, Bitbucket, Stack Overflow, Reddit, Discord, and Notion all support Markdown to varying degrees, making it a universal writing format across the technology industry.
The appeal of Markdown extends well beyond software documentation. Technical writers use it to draft manuals and API references that can be compiled into PDF, HTML, or EPUB formats using tools like Pandoc. Academics write research papers and lecture notes in Markdown, combining them with LaTeX math expressions for scientific publishing. Content marketers compose blog posts in Markdown because static site generators such as Hugo, Jekyll, and Gatsby consume Markdown files natively. Note-taking applications including Obsidian, Bear, and Typora use Markdown as their default storage format, giving users portable, future-proof documents that are not locked into any proprietary file type. Even email clients and messaging platforms now support Markdown shortcuts for bold, italic, and code formatting, which demonstrates how deeply this humble plain-text syntax has embedded itself into modern digital communication.
Your Questions Answered
What is Markdown?
Markdown is a lightweight markup language created by John Gruber in 2004. It lets you format plain text using simple symbols like hash marks for headings, asterisks for bold and italic, and hyphens for lists. A Markdown processor then converts this plain text into HTML or another output format. The key advantage of Markdown is that the source file remains human-readable even without rendering, unlike HTML or word-processor files that are filled with formatting codes. This readability, combined with its simplicity, has made Markdown the standard writing format for developers, technical writers, and anyone who values portable, future-proof documents.
How is Markdown different from HTML?
HTML uses angle-bracket tags such as <strong>, <em>, and <h1> to define formatting, which makes source documents harder to read. Markdown replaces these tags with minimal punctuation: two asterisks for bold, one asterisk for italic, and hash symbols for headings. While HTML gives you complete control over every element and attribute, Markdown covers the most common formatting needs with far less typing. In practice, most Markdown processors convert your text into HTML behind the scenes, so you get the same result on the web. You can also mix HTML directly into a Markdown document for cases where you need features Markdown does not cover, such as custom CSS classes or embedded video.
Who uses Markdown and where?
Markdown is used by millions of people across a wide range of industries. Software developers write README files, code documentation, and issue comments in Markdown on GitHub, GitLab, and Bitbucket. Technical writers draft API references and user guides that get compiled to HTML or PDF. Bloggers and content creators use static site generators like Hugo, Jekyll, and Gatsby, all of which consume Markdown files natively. Academics combine Markdown with LaTeX for research papers. Note-taking apps such as Obsidian, Bear, and Notion store content in Markdown. Even messaging platforms like Slack, Discord, and Reddit support Markdown shortcuts for formatting messages.
What is GitHub Flavored Markdown (GFM)?
GitHub Flavored Markdown is an extension of the CommonMark specification maintained by GitHub. It adds several features commonly needed by developers: task lists with checkboxes, tables using pipe characters, strikethrough text with double tildes, automatic URL linking, and syntax-highlighted fenced code blocks where you specify the programming language after the opening triple backticks. GFM is the default Markdown dialect on GitHub and has influenced many other platforms. If you write documentation or issues on GitHub, you are already using GFM. Our editor supports the core Markdown syntax that GFM is built upon, making it a natural companion for GitHub workflows.
Is my data safe when using this editor?
Yes, your content never leaves your browser. All parsing and rendering happen entirely on the client side using JavaScript that runs locally on your device. Nothing is transmitted to any server, stored in any database, or logged anywhere. This means you can safely compose private notes, draft confidential documentation, or work with sensitive content without any risk of third-party access. You can verify this by opening your browser developer tools and watching the network tab while you type — no requests are made. When you close the tab, your content is gone unless you have copied it.
What Markdown syntax does this editor support?
This editor supports all core Markdown elements: headings from level one through level four, bold text with double asterisks or double underscores, italic text with single asterisks or single underscores, inline code with backticks, fenced code blocks with triple backticks, links in bracket-parenthesis format, images with the exclamation-mark prefix, unordered lists with hyphens or asterisks, ordered lists with numbers followed by periods, blockquotes with the greater-than symbol, horizontal rules with three hyphens, and paragraph separation with blank lines. The parser handles nested formatting and multiple consecutive elements correctly.
Can I use this editor for writing README files?
Absolutely. This editor is ideal for composing README files because it shows you exactly how your document will look once rendered on platforms like GitHub or GitLab. Write your project title, description, installation instructions, usage examples with code blocks, and contribution guidelines, then use the Copy MD button to place the raw Markdown on your clipboard. Paste it directly into your README.md file. The live preview ensures you catch formatting issues before committing, saving you the cycle of pushing to GitHub and checking how it looks. For a polished README, combine headings, lists, code blocks, and links to create a document that is both informative and easy to navigate.
Markdown Cheat Sheet
This quick reference covers the most commonly used Markdown syntax elements. The left column shows what you type, and the right column describes the rendered result. Copy any syntax directly into the editor above to see it rendered live.
Pro tip: Markdown processors vary slightly. GitHub-Flavored Markdown (GFM) adds tables, task lists, strikethrough, and autolinked URLs. CommonMark is the standardized specification. Most platforms support both. When in doubt, test your markup in this editor to see exactly how it renders before publishing.