3FR to SUN Converter
FileFlip converts 3FR to SUN entirely inside your browser, using ImageMagick 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 SUN?#
- 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 SUN and the conversion starts on its own. FileFlip downloads 14.1 MB of WebAssembly the first time and nothing after that, then runs ImageMagick on your own machine.
- Save the SUN file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting 3FR to SUN lose quality?#
No. Converting 3FR to SUN writes the data out again without discarding any of it, so nothing that was in the 3FR file is lost on the way. What changes is the size of the file, not what is inside it.
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 SUN actually does to the file#
Converting 3FR to SUN runs on ImageMagick, downloads 14.1 MB of WebAssembly the first time and nothing after that, writes the data out again without discarding any of it.
| Engine | ImageMagick |
|---|---|
| Conversion path | One step: 3FR → SUN |
| Downloaded to your browser | 14.1 MB, once, then cached by your browser |
| Quality | Lossless |
| 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
- 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 SUN file?#
A SUN file is a Sun Raster bitmap, the same raw framebuffer image format Sun Microsystems shipped on SunOS workstations, saved under the alternate .sun extension some raster-image tools use in place of the identical .ras.
Recognise a .sun file as a Sun Raster image if it turns up alongside .ras files from the same legacy Solaris export or archive.
Convert SUN to PNG or TIFF for any modern use, since the .sun extension gets even less software recognition than .ras.
3FR to SUN 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.