Haddock to CBZ Converter
FileFlip converts Haddock to CBZ entirely inside your browser, using Pandoc and MuPDF compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert a Haddock file to CBZ?#
- Drop your Haddock file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to CBZ and the conversion starts on its own. FileFlip downloads 65.8 MB of WebAssembly the first time and nothing after that, then runs Pandoc and MuPDF on your own machine.
- Save the CBZ file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting Haddock to CBZ lose quality?#
Not in the sense of pixels or samples. Converting Haddock to CBZ rebuilds the file in CBZ's own model rather than re-encoding it, so everything CBZ can represent comes through exactly and anything it cannot has to be dropped. Expect the words to come through exactly and the page breaks to move.
Is it safe to convert Haddock files online?#
Yes, because nothing is uploaded. FileFlip converts Haddock files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What Haddock to CBZ actually does to the file#
Converting Haddock to CBZ runs on Pandoc and MuPDF, downloads 65.8 MB of WebAssembly the first time and nothing after that, rebuilds the file in the target's own model, keeps selectable text, and drops page layout.
| Engine | Pandoc and MuPDF |
|---|---|
| Conversion path | 2 steps: Haddock → HTML → CBZ |
| Downloaded to your browser | 65.8 MB, once, then cached by your browser |
| Quality | Rebuilt in the target's model |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| Selectable text | Kept | Carried through into the converted file. |
| Page layout | Dropped | The target format has nowhere to put it. |
Worth knowing before you start:
- reflowable input is laid out on a fixed 595x842pt page at 11pt before anything else happens
- the file passes through HTML on the way, so anything HTML cannot express does not survive
What is a Haddock file?#
A Haddock file holds documentation written in Haddock markup, the comment syntax Haskell's own documentation generator reads out of source files to build a module's API reference.
Write Haddock markup directly in Haskell source comments so `cabal haddock` can generate the package's API documentation.
Convert Haddock markup to Markdown when the same text needs to appear in a README or a project website outside the generated API docs.
What is a CBZ file?#
A CBZ file is a ZIP archive of page images, usually JPEG or PNG, named so they sort into reading order, with nothing else defining it as a comic beyond that convention.
Use CBZ to distribute a scanned or digital comic as sequential page images that any comic reader opens without conversion.
Convert CBZ to PDF when a comic needs to move into software that expects a page-based document instead of a folder of images.
Haddock to CBZ questions people ask#
What is a .haddock file?
A .haddock file holds text written in Haddock markup, the comment syntax Haskell's documentation generator reads. In practice this markup normally lives inside `-- |` and `-- ^` comments in a .hs source file rather than a standalone file, so a .haddock file usually appears when that text has been extracted or converted on its own.
How do I generate documentation from Haddock comments?
Running `cabal haddock` or `stack haddock` in a Haskell project reads the Haddock comments in its source files and builds an HTML API reference, the same kind of page Hackage hosts for every published package.
What's the difference between -- | and -- ^ in Haddock?
-- | attaches a Haddock doc comment to the declaration that follows it, while -- ^ attaches one to the declaration or argument just before it. The choice is about position: -- | documents forward, -- ^ documents backward.
What is a CBZ file?
A CBZ file is a ZIP archive holding a comic's pages as individual image files, named so they sort into the right reading order. There is no page-layout data or text encoding involved, which is the entire format: a comic reader just opens the ZIP and displays the images in sequence.