MRW to ICO Converter

MRW to ICO Converter

MRW is the Minolta (later Konica Minolta) camera raw format — a high-bit-depth sensor capture from DiMAGE compacts and Maxxum/Dynax DSLRs. ICO is the Windows icon container, used for application icons and website favicons. This converter demosaics and renders your raw photo, then downscales it into a small multi-resolution icon. Expect a large drop in resolution and color depth: a 12-bit raw becomes a standard 8-bit icon no larger than 256×256.

MRW Format at a Glance

ICO Format at a Glance

How to Convert MRW to ICO

1. Upload Your MRW File: Drag and drop your .mrw file or click "+ Add Files." You can queue several raws and convert them with the same settings.
2. Set the Icon Size: Open Advanced Options and use the Image resolution preset to choose your icon's edge length — 256P (256×256), 128P, 64P, 48P, 32P, 16P, and other icon sizes. 256P is the default.
3. Pick a Smaller Size for Favicons: For a browser favicon, 32×32 or 16×16 keeps the file tiny; for app icons, 256×256 with the others bundled gives the sharpest result at any display scale.
4. Convert and Download: Click "Convert" and download your .ico file. No sign-up, no watermark.

Frequently Asked Questions

Will I lose image quality converting MRW to ICO?

Yes — substantially, and by design. A raw MRW holds 12-bit-per-channel sensor data at full camera resolution. An icon is at most 256×256 and 8-bit, so the conversion bakes down the raw's wide latitude and shrinks the picture by a large factor. ICO is meant for crisp interface graphics, not photo viewing. If you want a normal, full-size picture, convert to JPG or PNG instead.

What icon sizes can the ICO output hold?

The Windows icon format supports images up to 256×256 pixels, and a single .ico file can carry several sizes at once. Common picks are 16×16 and 32×32 for favicons and small UI glyphs, 48×48 for desktop shortcuts, and 256×256 for high-DPI and large-tile display. Choose your edge length with the Image resolution preset before converting.

Should I use ICO for a website favicon?

Yes — favicon.ico is the long-standing default that every major browser recognizes, and an ICO can bundle 16×16 and 32×32 in one file so the browser picks the right size. In our testing, a 256×256 ICO with PNG-encoded data stays well under a few kilobytes, which is small enough to load without affecting page speed. Many modern sites also add a separate PNG or SVG favicon, but the ICO remains the safe fallback.

Why not just keep the photo as a raw MRW file?

Keep the MRW if you still want to edit the photo — raw holds the full sensor data and the most editing headroom. Convert to ICO only when you specifically need a Windows icon or favicon. The two formats serve opposite ends: MRW is a large archival capture, ICO is a tiny rendered interface asset.

Is the MRW raw format still being updated?

No. MRW is a legacy Minolta/Konica Minolta format. Konica Minolta announced it was leaving the camera business on 19 January 2006 and transferred its SLR assets to Sony, whose Alpha line uses the ARW raw format. MRW files from existing DiMAGE and Maxxum/Dynax cameras still open fine, but no new cameras write MRW.

Does converting to ICO keep transparency?

ICO supports a full 8-bit alpha channel in its 32-bit mode (available since Windows XP), so transparency is possible in the container. A photo straight from an MRW raw has no transparency to preserve — it is a solid rectangular image — so the icon will be opaque unless you edit in an alpha mask before or after conversion.

Are my files kept private during conversion?

Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark, and files are never shared or made public.

Does a rectangular photo get stretched to fit the square icon?

Icons are square, and a photo from an MRW almost never is, so the cleanest result comes from cropping your raw to a square around the subject before converting. Feed the whole frame and the image is scaled to fit the icon's square, which can distort proportions or leave the subject small. Crop first, then let the converter downscale that square to 256×256 or your chosen icon size.

Does the ICO store the icon as PNG or BMP internally?

Both are valid, and it depends on size. Small frames such as 16×16 and 32×32 are typically stored as uncompressed BMP, while the large 256×256 frame is PNG-compressed — a method the ICO format has allowed since Windows Vista — which is why a full-color 256-pixel icon can still stay only a few kilobytes. Every major browser and modern Windows version reads both encodings, so you do not have to choose.