MRW to PNG Converter

Convert MRW to PNG Online

A .mrw file is a Minolta RAW capture — the unprocessed sensor readout from a DiMAGE 5, DiMAGE 7/7i/7Hi, DiMAGE A1/A2/A200, or an Alpha/Dynax/Maxxum 5D or 7D. Konica Minolta announced its exit from the camera business on 19 January 2006 and transferred SLR operations to Sony that March, so MRW never got a successor and most photo apps now refuse to open it. This converter develops the RAW — demosaics the Bayer mosaic, applies the white balance the camera recorded at capture, and maps the result through a tone curve into sRGB — then writes a PNG that opens on any browser, phone, or desktop.

One thing to get right before you start: the default quality preset does not give you a lossless PNG. That matters more here than on any other source format, because people converting RAW are usually chasing maximum fidelity. Read the Quality Preset card below.

How to Convert MRW to PNG

1. Upload Your MRW File: Drag .mrw files onto the page or click "+ Add Files". Queue as many as you like; every file in the batch gets the same settings.
2. Choose a Quality Preset: "Very High (Recommended)" is preselected, and every preset except "Highest" runs a palette quantiser over the render. Pick Highest if you want a true-colour PNG with no palette reduction.
3. Set Image Resolution or Colors (Optional): "Image resolution" starts on "Keep original"; switch to a percentage, a preset height, or an explicit Width × Height to downscale. "Colors" can force a fixed palette (the dropdown starts at 128 colours, dithering off) if you deliberately want a small graphic-style PNG.
4. Convert and Download: Click Convert and save the PNG. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours. No sign-up, no watermark.

Quality Preset: The Only Setting That Decides Lossless vs Lossy

PNG the format is always lossless, but that says nothing about what gets written into it. On this page the Quality Preset picks between two completely different encoders:

The quantiser is lossy in the way that matters to a photograph: it maps millions of rendered colours down to a palette, which is where smooth skies and skin gradients start to band. It is a good trade for screenshots and flat graphics, and a bad one for a developed RAW. If this file is meant to be the export you keep, set the preset to Highest.

"Compression level" (starts at 6) and "Compression speed" (starts at 4) only tune how hard the encoder works on the byte stream — neither changes pixel values, and neither is a substitute for choosing Highest.

MRW vs PNG: What Actually Changes

Frequently Asked Questions

Is MRW to PNG lossless?

Only on the "Highest" preset. PNG's compression never discards pixels, but every preset below Highest sends the developed image through a palette quantiser first, so the pixels handed to the PNG encoder are already reduced. In our own check of the two paths, the Highest preset writes PNG colour type 2 (true colour) while the default preset writes colour type 3 (indexed palette) — same file extension, different picture. Choose Highest and the PNG is a faithful copy of the render.

Why does my MRW look different from the camera's JPEG preview?

Because you are seeing a different development. The MRW stores the sensor readout plus the camera's requested processing — sharpening, saturation and white balance live in the RIF and WBG blocks as instructions, not as applied pixels. Any converter, ours included, re-develops the file with its own demosaic and tone curve, so the result will not be bit-identical to the in-camera JPEG. Colour and exposure should land close; contrast and sharpening often differ slightly.

Does converting to PNG keep the 12-bit dynamic range?

No. Minolta's MRW stores a 12-bit readout per photosite, and the RAW decoder in this pipeline develops to 8 bits per channel, so the extra highlight and shadow headroom is spent during development rather than carried into the file. That headroom is what made RAW worth shooting, which is the argument for keeping the original .mrw alongside whatever you export.

Which cameras produced .mrw files?

The RAW decoder behind this converter lists the Minolta DiMAGE 5, DiMAGE 7, 7i and 7Hi, DiMAGE A1, A2 and A200, and the Alpha/Dynax/Maxxum 5D and 7D. Those are the bodies that wrote MRW. Sony's Alpha line, which inherited the Minolta lens mount in 2006, switched to ARW instead — so an ARW from an A100 onward is a different format despite the shared lineage.

Does the PNG keep my EXIF and Minolta MakerNote data?

No. MRW carries a complete TIFF/EXIF block plus Minolta's MakerNote — shutter, aperture, lens, camera model — inside its TTW section, but PNG is not the conventional carrier for camera EXIF and that metadata does not survive the conversion. If shooting data has to travel with the picture, export to MRW to TIFF or MRW to JPG instead, and keep the .mrw as the record of record.

PNG or TIFF for archiving an old Minolta shot?

TIFF, if you are archiving; PNG, if you are publishing. TIFF gives you an explicit choice of compression algorithm and is the format archives and print shops expect — though note that our TIFF output defaults to lossy JPEG compression, so you have to switch it to LZW. PNG is simpler and opens everywhere, but on this page you must remember to select the Highest preset. The honest answer for a genuine archive is that neither replaces the .mrw itself.

Can I make the PNG smaller without wrecking it?

Yes, and there are two different levers. Downscaling under "Image resolution" removes pixels and is almost always the better first move for web use — a 3008 × 2000 frame from a Maxxum 7D is far larger than any page needs. "Specific file size" lets you name a target instead and lets the encoder find its own way there. Reaching for a lower Quality Preset should be the last resort, because that is the lever that bands your gradients. You can also run a finished file through PNG compression later.

Why can nothing on my computer open a .mrw file anymore?

MRW was a proprietary Minolta container and the line that produced it ended: Konica and Minolta merged in 2003, the camera business exit was announced in January 2006, and photography operations wound down entirely by that September. Operating-system thumbnailers and mainstream editors have quietly dropped support since. Open-source RAW decoders still read the format — which is what this converter uses — so converting to PNG once is usually easier than reinstalling era-appropriate software.

How are my uploaded MRW files handled?

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up and no watermark, and files are never shared or made public. RAW files are large by nature, so on a slow connection the upload will take longer than the conversion does.