# html-to-markdown

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High-performance HTML to Markdown conversion powered by Rust. Ships as native bindings for **Rust, Python, TypeScript/Node.js, Ruby, PHP, Go, Java, C#, Elixir, R, C (FFI), and WebAssembly** with identical rendering across all runtimes.

**[Documentation](https://docs.html-to-markdown.kreuzberg.dev)** | **[Live Demo](https://docs.html-to-markdown.kreuzberg.dev/demo/)** | **[API Reference](https://docs.rs/html-to-markdown-rs/)**

## Highlights

- **150-280 MB/s** throughput (10-80x faster than pure Python alternatives)
- **12 language bindings** with consistent output across all runtimes
- **Structured result** — `convert()` returns `ConversionResult` with `content`, `metadata`, `tables`, `images`, and `warnings`
- **Metadata extraction** — title, headers, links, images, structured data (JSON-LD, Microdata, RDFa)
- **Visitor pattern** — custom callbacks for content filtering, URL rewriting, domain-specific dialects
- **Table extraction** — extract structured table data (cells, headers, rendered markdown) during conversion
- **Secure by default** — built-in HTML sanitization via ammonia

## Quick Start

```bash
# Rust
cargo add html-to-markdown-rs

# Python
pip install html-to-markdown

# TypeScript / Node.js
npm install @kreuzberg/html-to-markdown-node

# Ruby
gem install html-to-markdown

# CLI
cargo install html-to-markdown-cli
# or
brew install kreuzberg-dev/tap/html-to-markdown
```

See the **[Installation Guide](https://docs.html-to-markdown.kreuzberg.dev/getting-started/installation/)** for all languages including PHP, Go, Java, C#, Elixir, R, and WASM.

### Usage

`convert()` is the single entry point. It returns a structured `ConversionResult`:

```python
# Python
from html_to_markdown import convert

result = convert("<h1>Hello</h1><p>World</p>")
print(result.content)        # # Hello\n\nWorld
print(result.metadata)       # title, links, headings, …
```

```typescript
// TypeScript / Node.js
import { convert } from "@kreuzberg/html-to-markdown-node";

const result = convert("<h1>Hello</h1><p>World</p>");
console.log(result.content);    // # Hello\n\nWorld
console.log(result.metadata);   // title, links, headings, …
```

```rust
// Rust
use html_to_markdown_rs::convert;

let result = convert("<h1>Hello</h1><p>World</p>", None)?;
println!("{}", result.content.unwrap_or_default());
```

## Language Bindings

| Language | Package | Install |
|----------|---------|---------|
| Rust | [html-to-markdown-rs](https://crates.io/crates/html-to-markdown-rs) | `cargo add html-to-markdown-rs` |
| Python | [html-to-markdown](https://pypi.org/project/html-to-markdown/) | `pip install html-to-markdown` |
| TypeScript / Node.js | [@kreuzberg/html-to-markdown-node](https://www.npmjs.com/package/@kreuzberg/html-to-markdown-node) | `npm install @kreuzberg/html-to-markdown-node` |
| WebAssembly | [@kreuzberg/html-to-markdown-wasm](https://www.npmjs.com/package/@kreuzberg/html-to-markdown-wasm) | `npm install @kreuzberg/html-to-markdown-wasm` |
| Ruby | [html-to-markdown](https://rubygems.org/gems/html-to-markdown) | `gem install html-to-markdown` |
| PHP | [kreuzberg-dev/html-to-markdown](https://packagist.org/packages/kreuzberg-dev/html-to-markdown) | `composer require kreuzberg-dev/html-to-markdown` |
| Go | [htmltomarkdown](https://pkg.go.dev/github.com/kreuzberg-dev/html-to-markdown/packages/go/v3/htmltomarkdown) | `go get github.com/kreuzberg-dev/html-to-markdown/packages/go/v3` |
| Java | [dev.kreuzberg:html-to-markdown](https://central.sonatype.com/artifact/dev.kreuzberg/html-to-markdown) | Maven / Gradle |
| C# | [KreuzbergDev.HtmlToMarkdown](https://www.nuget.org/packages/KreuzbergDev.HtmlToMarkdown/) | `dotnet add package KreuzbergDev.HtmlToMarkdown` |
| Elixir | [html_to_markdown](https://hex.pm/packages/html_to_markdown) | `mix deps.get html_to_markdown` |
| R | [htmltomarkdown](https://kreuzberg-dev.r-universe.dev/htmltomarkdown) | `install.packages("htmltomarkdown")` |
| C (FFI) | [releases](https://github.com/kreuzberg-dev/html-to-markdown/releases) | Pre-built `.so` / `.dll` / `.dylib` |

## Part of the Kreuzberg Ecosystem

html-to-markdown is developed by [kreuzberg.dev](https://kreuzberg.dev) and powers the HTML conversion pipeline in [Kreuzberg](https://docs.kreuzberg.dev), a document intelligence library for extracting text from PDFs, images, and office documents.

## Contributing

Contributions welcome! See [CONTRIBUTING.md](CONTRIBUTING.md) for setup instructions and guidelines.

## License

MIT License — see [LICENSE](LICENSE) for details.
