Haddock to HTML Converter - Haskell Documentation Tool

Convert Haddock markup to HTML with type signatures, code examples, and Haskell syntax. Perfect for Hackage docs, functional programming APIs.

Note: First conversion initializes Pandoc WebAssembly (~55MB). Subsequent conversions are instant.

Drop Haddock file here or click to browse

Accepts .hs, .lhs, .txt files

Haddock Input

Enter Haddock markup to see preview

Common Haddock Syntax

Haddock Syntax	Description	HTML Result
`-- \| Documentation`	Function documentation	Block documentation above declaration
`{-\| Multi-line doc -}`	Multi-line documentation	Block documentation with multiple paragraphs
`/emphasis/`	Italic text	emphasis
`__bold__`	Bold text	bold
`@code@`	Inline code	`code`
`'identifier'`	Link to identifier	<a>identifier</a>
`"Module.Name"`	Link to module	<a>Module.Name</a>
`>>> example`	Code example with output	<pre>example</pre>
`> code block`	Bird-track code block	<pre><code>code block</code></pre>
`<url>`	Hyperlink	<a href="url">url</a>
`* List item`	Unordered list	<ul><li>item</li></ul>
`(1) Numbered item`	Ordered list	<ol><li>item</li></ol>

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Frequently Asked Questions

Haddock is the standard documentation tool for Haskell, used to generate API documentation from annotated source code. It supports type signatures, hyperlinked identifiers, code examples, and rich formatting commonly seen on Hackage.

Haddock is specifically designed for Haskell documentation with native support for type signatures, mathematical notation, hyperlinked identifiers, and functional programming conventions. It integrates seamlessly with GHC and the Haskell ecosystem.

Full support for module headers, function documentation, type signatures, code blocks with @...@, emphasis, bold, hyperlinks, ordered/unordered lists, definition lists, examples sections, and inline code. Bird-track style code blocks (> prefixed lines) are also converted.

Yes. Haddock markup supports documenting type classes, type families, data types, newtype declarations, and instances. Type signatures and constraints are preserved with proper formatting in the HTML output.

Code examples can be written using @ delimiters (@code@), bird tracks (> at line start), or code blocks (>>>). All are converted to HTML

 elements with Haskell syntax highlighting classes applied.


        
          
            
          
          
            Yes. All conversion happens locally in your browser using WebAssembly. Your Haddock documentation never leaves your device and is not uploaded to any server, ensuring complete privacy.
          
        
        
          
            
          
          
            Haddock is tailored for Haskell with better support for type signatures, mathematical notation, inline code with @...@, and conventions from functional programming. It's the standard for Hackage packages and integrates with Haskell tooling.
          
        
        
          
            
          
          
            Yes. You can paste Haddock text directly or upload .hs, .lhs, or .txt files containing Haddock markup. The tool extracts and converts the documentation to HTML instantly.
          
        
        
          
            
          
          
            Haddock supports URL links , named links [link text](url), and identifier links 'functionName' or "ModuleName". The converter preserves links and formats them as HTML anchors.
          
        
        
          
            
          
          
            Haddock supports mathematical symbols and Greek letters commonly used in functional programming (λ, α, β, →, ∀, etc.). These are preserved in HTML and can be styled with fonts that support Unicode mathematical operators.

Common Haddock Syntax

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