HTML to Markdown Converter

Convert raw HTML code into clean, formatted CommonMark Markdown. Preserves headings, bold/italic styles, links, code blocks, and blockquotes with zero server upload.

Raw HTML Input

Sample Documents
Markdown Output
478 chars

Headings

3

Links

1

Lines

19

Standard

CommonMark

CommonMark Markdown478 characters
# Mastering Modern Web Architecture
Modern applications rely on **decoupled microservices** and *serverless computing*.

## Key Advantages

  - Instant autoscaling and zero cold-start latency

  - Built-in SSL/TLS termination and [Edge Routing](https://example.com/edge)

  - Seamless continuous integration

> Microservices enable independent deployment cycles and isolated fault domains.
### Example Configuration
```
{
  "runtime": "edge",
  "regions": ["iad1", "sfo1"]
}
```

Zero Server Upload Privacy

HTML conversion is executed entirely in your local browser memory using JavaScript regular expressions.

DOM Tree Transformation Invariants & Markdown Equations

Converting HTML documents into CommonMark Markdown maps semantic DOM elements into lightweight plain text tokens:

1. Semantic Tag Mapping Function
M(T) = (<h1>C</h1> ⇒ "# " + M(C)) ∧ (<strong>C</strong> ⇒ "**" + M(C) + "**") ∧ (<a href=U>C</a> ⇒ "[" + M(C) + "](" + U + ")")
2. Markdown Compression Ratio
Compression Ratio =
Length(Markdown Chars)Length(Raw HTML Chars)
× 100%
Step-by-Step HTML to Markdown Conversion Breakdown
Step 1: Comment Removal & Entity Decoding
Strip <!-- comments --> and decode &amp;, &lt;, &gt;.
Step 2: Semantic Block & Inline Transformation
Map headings to #, links to [text](url), and pre/code to triple backticks.
Step 3: Wrapper Stripping & Whitespace Normalization
Result=Clean CommonMark Document (.md)

HTML vs Markdown Syntax Mapping Reference

HTML ElementMarkdown EquivalentRendered Output
<h1>Heading 1</h1># Heading 1Heading 1
<strong>Bold</strong>**Bold**Bold
<a href="url">Link</a>[Link](url)Link
<pre><code>code</code></pre>```code```code block
<blockquote>quote</blockquote>> quote“quote”

Frequently Asked Questions

How do I convert HTML to clean Markdown?
Paste your HTML markup into the input editor or choose one of the sample presets. The converter instantly strips wrapper tags and translates headings, links, code blocks, lists, and formatting into standard CommonMark syntax.
What HTML elements are supported?
The engine converts: headings (h1–h6), bold (strong/b), italic (em/i), links (a), images (img), lists (ul/ol/li), preformatted code blocks (pre/code), blockquotes (blockquote), horizontal rules (hr), and paragraphs (p).
Is my HTML code safe when using this converter?
Yes. Conversion is performed 100% locally in your browser using JavaScript regular expressions. Your content is never transmitted to or stored on external servers.
How does Markdown compare to HTML in file size?
Markdown typically reduces the file character count by 40% to 70% compared to equivalent HTML markup by eliminating verbose closing tags and layout attributes.

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