RMF to ICO Converter
FileFlip converts RMF to ICO 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 RMF file to ICO?#
- Drop your RMF 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 ICO 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 ICO file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting RMF to ICO lose quality?#
No. Converting RMF to ICO writes the data out again without discarding any of it, so nothing that was in the RMF file is lost on the way. What changes is the size of the file, not what is inside it.
Is it safe to convert RMF files online?#
Yes, because nothing is uploaded. FileFlip converts RMF 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 RMF to ICO actually does to the file#
Converting RMF to ICO 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: RMF → ICO |
| 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 RMF file?#
An RMF file with image content is handled by treating its bytes as raw camera sensor data, since ImageMagick routes the .rmf extension to its DNG decoder rather than to a decoder built for an independently documented RMF image format.
There's no established reason to create a file as RMF; treat one only as raw camera sensor data if that's confirmed to be its actual source.
Convert an .rmf file to DNG or JPG as soon as it needs to open outside of ImageMagick's raw-image pipeline, since almost nothing else recognizes the extension as an image.
What is an ICO file?#
An ICO file packs several copies of the same picture, each a different pixel size and color depth, into one Windows icon container so the operating system can pick whichever copy fits the taskbar, the desktop, or a File Explorer thumbnail.
Use ICO for Windows application icons, desktop shortcuts, and website favicons, where the operating system or browser needs to choose the right size automatically.
Convert ICO to PNG when the image needs to be edited freely, resized to a size the icon doesn't already contain, or used anywhere other than Windows or a browser favicon.
RMF to ICO questions people ask#
What is an RMF file?
As an image, an RMF file is data that ImageMagick decodes using its DNG raw-camera decoder, because no independently published RMF image format specification exists. The .rmf extension is also used, unrelatedly, for Valve level-editor files, Beatnik MIDI music files and Adobe rights-management licenses, so a file's actual contents depend entirely on what produced it.
What program opens RMF image files?
ImageMagick and libraries built on it will attempt to open an RMF file as raw camera sensor data through the same decoder used for DNG files. Because there's no confirmed RMF image specification, there's no other software known to open it as an image.
Why won't my RMF file open as an image?
Unlike JPG or PNG, .rmf is not a fixed, documented image format, so a decoder only succeeds if the file's bytes happen to match the raw sensor layout ImageMagick's DNG decoder expects. A file with this extension might just as easily be a Hammer level file, a MIDI-based audio file, or a rights-management license, none of which are images at all.
What is an ICO file?
An ICO file is the icon format Windows uses for application icons, desktop shortcuts, and browser favicons. Rather than holding a single picture, it bundles multiple versions of the same image at different pixel sizes and color depths so the system can display whichever one fits the context.