MRW to RAS Converter
FileFlip converts MRW to RAS 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 an MRW file to RAS?#
- Drop your MRW 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 RAS 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 RAS file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting MRW to RAS lose quality?#
No. Converting MRW to RAS writes the data out again without discarding any of it, so nothing that was in the MRW file is lost on the way. What changes is the size of the file, not what is inside it.
Is it safe to convert MRW files online?#
Yes, because nothing is uploaded. FileFlip converts MRW 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 MRW to RAS actually does to the file#
Converting MRW to RAS 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: MRW → RAS |
| 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 an MRW file?#
An MRW file stores the unprocessed sensor data captured by a Minolta DiMAGE or Dynax/Maxxum digital camera, the raw format Minolta used until Sony bought its camera division in 2006 and switched the successor Alpha line to ARW.
Keep a file as MRW only if it is an original capture from a Minolta DiMAGE or Dynax/Maxxum camera you want to preserve unchanged.
Convert MRW to DNG or TIFF for long-term storage or editing, since no current camera writes the format and support for it is unlikely to improve.
What is a RAS file?#
A RAS file is a Sun Raster bitmap, the raw framebuffer image format Sun Microsystems built into SunOS workstations, and it is byte-for-byte identical to the format most tools also recognise under the .sun extension.
Open a RAS file when it comes from legacy Sun or Solaris workstation software, or from an old dataset captured directly off a SunOS framebuffer.
Convert RAS to PNG or TIFF for anything beyond archival viewing, since almost no current software or web platform accepts Sun Raster natively.
MRW to RAS questions people ask#
What camera shot this MRW file?
MRW files come from Minolta digital cameras, starting with the DiMAGE 7 in 2001 and continuing through later DiMAGE models and the Dynax/Maxxum 5D and 7D DSLRs. Sony's first Alpha DSLR, released in 2006 after it acquired Konica Minolta's camera business, switched to the ARW format instead.
Should I convert MRW files to something else?
Converting MRW to DNG or TIFF is worth doing for long-term storage, since Minolta stopped making cameras in 2006 and fewer applications add new support for a format tied to a discontinued camera line every year.
Can I still open an old MRW file?
Yes. MRW files open in RawTherapee, darktable and digiKam, all of which use the dcraw/LibRaw decoding libraries that support the format, and ExifTool reads and writes their metadata. No Minolta software has been updated in years, so a modern raw processor is the more reliable option.
Is a RAS file the same as a SUN file?
Yes. A RAS file and a SUN file are the same Sun Raster format, identified by the same magic number and header layout, just saved under two different extensions that various tools have used over the years.