Does my content leave the browser?

No. All Markdown parsing and HTML rendering happens locally in your browser. Your text is never sent to any server and is automatically saved to localStorage so it survives a page refresh.

Which Markdown flavour is supported?

The editor uses GitHub Flavored Markdown (GFM) via the marked library. This includes standard Markdown plus GFM extensions: tables, strikethrough (~~text~~), fenced code blocks with language hints, and autolinks.

Can I use the exported HTML file directly?

Yes. The exported file is a self-contained HTML document with embedded CSS. You can open it directly in a browser, email it, or paste its content into a CMS.

How do I insert a table, code block, or image?

Use the toolbar buttons. 'Table' inserts a sample Markdown table you can edit. 'Code' wraps selected text in a fenced code block. 'Img' inserts an image snippet — replace the placeholder URL with your image's address.

Markdown Editor

Write Markdown on the left, see rendered HTML on the right — instantly. Export to HTML, copy the source, and use the toolbar for quick formatting. Your content never leaves your browser.

edit_noteMarkdown

visibilityPreview

Welcome to Markdown Editor

A live preview editor — write on the left, see rendered HTML on the right.

Text Formatting

You can write italic, bold, ~~strikethrough~~, and inline code.

Lists

Unordered

Item one
Item two
- Nested item

Ordered

First step
Second step
Third step

Code Block

function greet(name) {
  return `Hello, ${name}!`
}

Blockquote

"Write documentation as if the next reader is a stranger who knows nothing about your intent."

Table

Name	Type	Default
`width`	number	`100`
`height`	number	`auto`
`color`	string	`#000`

Link

Visit DevZone Tools for more free developer tools.

Replace this sample and start writing your own Markdown.

138 words848 chars48 lines

GFM

Why use our online Markdown Editor?

Edit Markdown with a live split-panel preview in your browser. No cloud sync, no account — your writing stays local. Export to HTML or copy the raw Markdown when you're done.

How to use Markdown Editor

1
Write Markdown in the editor
Start typing in the left pane. The editor supports GitHub Flavored Markdown — headings, bold, italic, tables, code blocks, blockquotes, and more.
2
Use the toolbar for quick formatting
Click any toolbar button to wrap selected text or insert a snippet at the cursor. Buttons cover bold, italic, headings H1–H3, inline code, code blocks, links, images, lists, blockquotes, tables, and horizontal rules.
3
See the live preview on the right
The right pane renders your Markdown as HTML in real time. Scroll through the preview to check headings, tables, and code block formatting as you write.
4
Export or copy the result
Click 'Export HTML' to download a self-contained .html file with clean CSS, ready to open in any browser. Use 'Copy HTML' to copy the raw HTML snippet, or 'Copy MD' to copy your Markdown source.

Markdown syntax essentials — what every writer should know

Markdown was created by John Gruber in 2004 with the goal of making text that was readable as-is and could also be converted to HTML. The core syntax covers the patterns that appear in 99% of everyday writing.

Headings use # prefixes: one # for H1, two ## for H2, up to six ######. Emphasis: single *asterisks* or _underscores_ for italic, double **asterisks** for bold. Links: [link text](URL). Images: ![alt text](URL). Blockquotes start with >, and horizontal rules are three or more --- or ***.

Code has two forms: single backticks for `inline code` and triple backticks for fenced code blocks. Fenced blocks accept a language hint (```javascript) that syntax-highlighting renderers use. Unordered lists use -, +, or * as bullet characters. Ordered lists use numbers followed by a period (1., 2., 3.). Tables use pipe characters to separate columns and dashes for the header separator row.

GitHub Flavored Markdown adds three widely-used extensions: ~~strikethrough~~ with double tildes, task list checkboxes with - [ ] and - [x], and autolinks for bare URLs.

When to use Markdown vs a rich text editor

Markdown's advantage is portability and precision. A Markdown file is plain text — it can be versioned in git, diffed meaningfully, processed by command-line tools, and rendered by hundreds of different applications without losing structure. This makes it the right choice for documentation, README files, technical writing, developer notes, and any content that needs to live in a code repository.

Rich text editors (Microsoft Word, Google Docs, Notion) store formatting in proprietary binary formats or complex HTML. The formatting is invisible and can change unexpectedly when pasted into another application. Rich text is the right choice for documents that will be edited by non-technical stakeholders, shared as formatted PDFs, printed, or live inside a specific platform ecosystem.

The hybrid case is increasingly common: many modern content platforms (Notion, Linear, GitHub Issues, Confluence) render Markdown internally. Writers use Markdown syntax in a rich-text-feeling interface. This is the best of both worlds for content that needs to be readable by humans and processable by systems.

Exporting Markdown to HTML — what the output contains

When you export Markdown to HTML using this editor, the output is a self-contained HTML file with embedded CSS styling. This means you can open it directly in any browser without a separate stylesheet, email it as an attachment that displays correctly, or host it as a static page without a build step.

The embedded CSS applies reasonable default styling: a centered content column with a max-width, serif or sans-serif body text, monospace font for code blocks, a subtle border for blockquotes, and a clean table style. It does not include a full design system — it is a minimal, readable baseline.

If you want to paste the Markdown-rendered content into a CMS, copy the body HTML (the content between <body> tags) rather than the entire file. Most CMS rich-text editors accept pasted HTML through their source/HTML mode. Be aware that any inline styles or classes from the exported CSS will not apply in a CMS environment — the CMS will apply its own stylesheet to the content.

Markdown flavors — CommonMark, GFM, and why they diverge

Markdown was originally defined by John Gruber's 2004 spec, which left many edge cases ambiguous. Over the following decade, different implementations made different choices about how to handle these ambiguities — creating incompatible dialects. A table that renders in GitHub would not render in Reddit, and a task list that worked in Notion would fail in Pandoc.

CommonMark, released in 2014, is an attempt to create a complete, unambiguous specification for Markdown. It defines exactly how every edge case should be handled and provides a formal test suite. Major platforms have adopted CommonMark as their baseline — Reddit, Discourse, and static site generators like Hugo and Jekyll use CommonMark-compliant parsers.

GitHub Flavored Markdown (GFM) extends CommonMark with four additions: tables (pipe-separated columns with a header separator row), task list items (- [ ] and - [x]), strikethrough (~~text~~), and autolinks (bare URLs become clickable without angle brackets). GFM is the de facto standard for README files, GitHub Issues, and Pull Request descriptions. This editor uses the marked library configured for GFM, which means all four GFM extensions work alongside the full CommonMark baseline.

Other notable dialects: Pandoc Markdown adds footnotes, definition lists, and citation support; MultiMarkdown adds cross-references and metadata headers; MDX (used in documentation frameworks like Docusaurus and Next.js) allows JSX components inline with Markdown. When copying content between platforms, plain CommonMark is the most portable choice.

Frequently Asked Questions

Does my content leave the browser?: No. All Markdown parsing and HTML rendering happens locally in your browser. Your text is never sent to any server and is automatically saved to localStorage so it survives a page refresh.
Which Markdown flavour is supported?: The editor uses GitHub Flavored Markdown (GFM) via the marked library. This includes standard Markdown plus GFM extensions: tables, strikethrough (~~text~~), fenced code blocks with language hints, and autolinks.
Can I use the exported HTML file directly?: Yes. The exported file is a self-contained HTML document with embedded CSS. You can open it directly in a browser, email it, or paste its <body> content into a CMS.
How do I insert a table, code block, or image?: Use the toolbar buttons. 'Table' inserts a sample Markdown table you can edit. 'Code' wraps selected text in a fenced code block. 'Img' inserts an image snippet — replace the placeholder URL with your image's address.