3FR to CBZ Converter
FileFlip converts 3FR to CBZ entirely inside your browser, using ImageMagick 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 3FR file to CBZ?#
- Drop your 3FR 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 24.1 MB of WebAssembly the first time and nothing after that, then runs ImageMagick 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 3FR to CBZ lose quality?#
No. The 3FR picture is placed into the CBZ document at its full resolution, so every pixel reaches it intact. What you give up is that it becomes a picture inside a document rather than text.
Is it safe to convert 3FR files online?#
Yes, because nothing is uploaded. FileFlip converts 3FR 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 3FR to CBZ actually does to the file#
Converting 3FR to CBZ runs on ImageMagick and MuPDF, downloads 24.1 MB of WebAssembly the first time and nothing after that, places the picture into the document at full resolution.
| Engine | ImageMagick and MuPDF |
|---|---|
| Conversion path | 2 steps: 3FR → PNG → CBZ |
| Downloaded to your browser | 24.1 MB, once, then cached by your browser |
| Quality | Pixels preserved |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
Worth knowing before you start:
- camera raw is demosaiced with ImageMagick's defaults, which will not match the camera's own rendering
- the picture is placed in the document as a picture; no text is recognised out of it
- some cameras write lossily compressed raw, so the source is not always a complete sensor record
What is a 3FR file?#
A 3FR file stores raw, minimally processed sensor data captured by a Hasselblad medium-format digital camera or digital back, a proprietary format Hasselblad introduced in 2006 with the H2D.
Shoot 3FR when working on a Hasselblad system and processing in Phocus, where the format's full sensor data and metadata are used as intended.
Convert 3FR to DNG or TIFF once editing is finished, since Phocus is the software most reliably guaranteed to read it and most archives and labs expect a more interoperable format.
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.
3FR to CBZ questions people ask#
What camera shot my 3FR file?
A 3FR file was shot on a Hasselblad medium-format digital camera or digital back, such as the H-series or X-series bodies. Hasselblad introduced the format in 2006 with the H2D.
What opens a 3FR file?
Hasselblad's own Phocus software gives the most reliable results with 3FR since Hasselblad builds it specifically for their raw pipeline. Adobe Camera Raw, Lightroom and Capture One also read 3FR, though support can lag behind a brand-new Hasselblad body.
Is 3FR the same as Hasselblad's FFF format?
No. Both are Hasselblad raw formats, but FFF is an older container inherited from Imacon after Hasselblad acquired it in 2004, while 3FR is the format Hasselblad introduced with the H-series in 2006. Which one a file uses depends on which Hasselblad product produced it.
What should I convert a 3FR file to for long-term storage?
DNG keeps the raw sensor data and metadata in an openly documented container that doesn't depend on Phocus staying available, which makes it a safer archival choice than leaving files as 3FR.