Free Markdown to HTML Converter With Rendered Preview & GFM Support
Paste Markdown and get clean HTML output — with a live rendered preview alongside. Supports CommonMark essentials plus GFM strikethrough, fenced code, and tables. 100% client-side; no signup, no upload.
Markdown to HTML Converter
Convert Markdown into clean HTML — with all the essentials:
Lists work
- Free
- Fast
- Ad-free
- Step one
- Step two
- Step three
Code formatting
Inline code and fenced blocks:
function hello(name) {
return `Hello, ${name}!`;
}Links & images
Visit our [JSON Formatter](https://www.toolk.site/tools/json-formatter "JSON tool").
Quotes & rules
Markdown is plain-text formatting designed for both reading and editing.
GFM extras
strikethrough and tables:
| Tool | Category | Free |
|---|---|---|
| JSON Formatter | Developer | Yes |
| CSS Filter | Design | Yes |
| HMAC Generator | Developer | Yes |
Inline HTML in the Markdown input is escaped, not rendered. The converter is focused on safe text-to-HTML translation — paste output directly into a CMS or template.
CommonMark + GFM
All CommonMark essentials (headings, bold/italic, code, links, images, lists, blockquotes, hr) plus GFM strikethrough, fenced code with language hint, and tables.
Live Rendered Preview
Side-by-side raw-HTML and rendered-preview tabs so you can verify the visual output matches your intent before pasting elsewhere.
Clean, Embed-Ready HTML
Output uses standard semantic elements (h1-h6, p, ul/ol/li, pre/code with language class, blockquote, hr, table) — paste into any CMS or template without modification.
100% Client-Side
Custom Markdown parser runs entirely in your browser. Inline HTML in input is escaped, not executed. No fetch, no tracking, works offline once loaded.
Markdown In, Clean HTML Out — Ready to Paste Anywhere
Markdown is the format of the writing web — READMEs on GitHub, posts on Stack Overflow, content in static-site generators, even Slack messages and Discord descriptions. But many target systems still want HTML: CMS rich-text editors, email templates, custom blog templates, embedded help docs. Our Free Markdown to HTML Converter bridges that gap with a focused custom parser that handles the CommonMark essentials and the most common GitHub Flavored Markdown extensions — strikethrough, fenced code with language hints, pipe tables. The rendered preview lets you verify the output looks right before you paste; the raw-HTML view shows what you will actually be embedding.
Pair this with our Markdown Editor (for live writing rather than one-shot conversion), HTML Formatter (beautify the output if your target system is picky about whitespace), HTML Entity Converter (escape any special characters in raw output), and the Markdown Table Generator (build table-shaped Markdown blocks without typing pipes by hand).
Supported Markdown Syntax
| Markdown Syntax | HTML Output | Notes |
|---|---|---|
| # Heading 1 … ###### Heading 6 | <h1>…<h6> | Six levels; space required after the #. ATX-style. |
| **bold** or __bold__ | <strong> | Both asterisk and underscore syntaxes accepted. |
| *italic* or _italic_ | <em> | Single asterisk or underscore. |
| `inline code` | <code> | Single backticks. Use double backticks if the code contains a backtick. |
| ```lang\n…\n``` | <pre><code> | Fenced code block with optional language hint. |
| [text](url "title") | <a href="…" title="…"> | Inline link. Title attribute optional. |
|  | <img alt="…" src="…"> | Inline image. Alt text required for accessibility. |
| - item / * item / + item | <ul><li> | Unordered list. Any of three bullet characters. |
| 1. item / 2. item | <ol><li> | Ordered list. Number does not affect rendering. |
| > quote | <blockquote> | Quote block. Stack > for nesting. |
| --- or *** or ___ | <hr> | Horizontal rule. Three or more characters on a line by themselves. |
| ~~strikethrough~~ (GFM) | <del> | GitHub Flavored Markdown — not in original CommonMark. |
| | col | col | (GFM) | <table> | GFM tables; header row + divider (---|---) on the next line. |
Not supported: setext headings, nested lists, reference-style links, definition lists, footnotes, task list checkboxes, raw HTML pass-through. For those, use a full library like markdown-it or marked.js.
Where This Converter Pays Off
Embed Markdown content in a CMS
Convert your README or knowledge-base article into HTML you can paste into any rich-text or block editor.
Generate static-site HTML
Build a tiny static-site pipeline: write content in Markdown, convert to HTML, drop into your template.
Email-friendly newsletters
Compose newsletters in Markdown for legibility, then convert to inline HTML for email clients that need it.
Code documentation
Turn a code-heavy README into clean HTML with syntax-highlighting-ready <code class="language-xxx"> blocks.
Custom Markdown previews
Power Markdown previews in your own apps without bundling a heavyweight library.
Markdown Writing Best Practices
1. Always Add Alt Text to Images
 — not . Empty alt text is a screen-reader accessibility failure and a search-engine SEO failure. Always describe the image.
2. Use Fenced Code, Not Indented
```js with closing ``` is more reliable than four-space-indented code, supports a language hint, and survives copy-paste better.
3. Blank Lines Between Blocks
Always separate paragraphs, lists, code blocks, and headings with a blank line. CommonMark requires this for correct parsing; some loose parsers tolerate omission, ours does not.
4. Hyperlink Descriptive Anchors
Avoid "click here" links. Write [the JWT decoder tool](https://www.toolk.site/tools/jwt-decoder) so the anchor text describes the destination — better for accessibility and SEO.