ERF to ICO Converter

ERF to ICO Converter

ERF is Epson's camera RAW format — the unprocessed sensor data written by the Epson R-D1 rangefinder series. ICO is the Windows icon container, where each image is at most 256×256 pixels. This converter renders the high-bit-depth RAW photo down to a small, multi-resolution icon suitable for an app, shortcut, or favicon. It is a one-way trip in terms of fidelity: a 6-megapixel, 12-bit RAW frame is demosaiced, tone-mapped to standard 8-bit color, and shrunk to icon dimensions, so use this only when you actually need an icon. For a viewable photo, convert to JPG or PNG instead.

ERF Format at a Glance

ICO Format at a Glance

How to Convert ERF to ICO

1. Upload Your ERF File: Drag and drop your .erf file onto the page or click "+ Add Files" to browse. You can queue several RAW files and convert them in one batch.
2. Set Image Resolution: Open Advanced Options and pick a preset from the Image resolution dropdown. The default is 256P, the largest size an icon image supports; choose a smaller preset like 32P or 64P for a classic small icon.
3. Review the Defaults: The renderer demosaics the RAW and bakes its 12-bit color down to standard 8-bit automatically — no extra setup is needed for a usable icon.
4. Convert and Download: Click "Convert" and download your ICO file. No sign-up, no watermark.

Frequently Asked Questions

Why would I convert a RAW photo to an icon at all?

The usual reason is to turn a photograph into an app icon, a desktop shortcut graphic, or a website favicon. Because an ICO image tops out at 256×256, there is no point converting a RAW frame to ICO for viewing — the format exists to embed a recognizable little picture into Windows or a browser tab, not to display a photo.

How much quality do I lose going from ERF to ICO?

A large amount, and that is expected. ERF stores roughly 6 megapixels of 12-bit-per-channel sensor data with wide editing latitude. ICO caps each image at 256×256 and at standard 8-bit color, so the conversion discards almost all of the resolution and the extra bit depth. The output is fine for an icon and a poor substitute for the original photo, which is why we keep your source file untouched.

Does the ICO keep multiple icon sizes in one file?

This converter writes a single image at the resolution you choose. The ICO container itself can hold several sizes and color depths in one file, but for a clean ERF-to-icon conversion we produce one image at your selected preset. If you need a multi-size icon set, generate each size you want and combine them in an icon editor.

Can ICO files store transparency from my photo?

ICO supports a 32-bit mode with an 8-bit alpha channel, introduced in Windows XP, so transparency is possible in the format. A RAW photo, however, has no alpha channel to begin with — it is a fully opaque image — so the icon will be opaque unless you first add transparency in an image editor before converting.

Should I convert ERF to JPG or PNG instead?

Yes, if your goal is to look at the photo or share it. Convert ERF to JPG for a compact, universally viewable photo, or convert ERF to PNG for a lossless version that keeps sharp edges. Reserve ICO for when you specifically need a Windows icon or favicon.

What happens to my files after I convert them?

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 your files are never shared or made public. In our testing, a single 6 MP ERF frame rendered to a 256×256 ICO finishes in a few seconds, dominated mostly by the upload time rather than the conversion itself.

What icon size should I pick for a favicon versus an app icon?

For a browser favicon, a small square is enough — 32×32 (the 32P preset) covers most tab and bookmark uses, with 16×16 for the tiniest cases. For a Windows application icon or a desktop shortcut, choose the largest 256P preset so the icon stays crisp on high-DPI displays and in large-icon views. Because an ICO image tops out at 256×256, there is no benefit to feeding it more resolution than that.

Will browsers and Windows actually accept this ICO as a favicon or shortcut icon?

Yes. ICO is Microsoft's native icon format and the long-standing standard for favicon.ico, so Windows shortcuts and the taskbar read it directly, and Chrome, Firefox, Edge, and Safari all accept an .ico favicon.

Reference it from a page's <link rel="icon"> tag, or drop it into a shortcut's properties, and it works without any further conversion.